pp. 39-44

 

pp. 47-50

 

ADJACENT INSTALLATIONS FOR MACHINE TOOLS. LUBRICATION SYSTEMS FOR CNC MACHINE TOOLS
 

Anca BUCUREŞTEANU, Emilia BĂLAN

 View full text

 

Abstract: The paper presents some aspects concerning the lubrication systems for modern machine tools, especially the CNC one. The calculation methodology and the mathematical models are shown, but also some modern lubrication diagrams and technical solutions, that can be useful for the designers and manufacturers.

 

Key words: lubrication, adjacent installations, machine tools, mathematical models, simulation.

 

Authors:

PhD, Eng, Anca BUCUREŞTEANU, Assoc. Professor, University "Politehnica" of Bucharest, Machines and Production Systems Department,

E-mail: ancab66@yahoo.com.

PhD, Eng, Emilia BĂLAN, Assoc. Professor, University "Politehnica" of Bucharest, Machines and Production Systems Department,

E-mail: emiliabalan@yahoo.com

 

pp. 51-54

 

MILLING MACHINE FOR SPUR GEARS WITH CIRCULAR ARC

directriX

 

Romeo CIOARĂ

 View full text

 

Abstract: While general awareness exists in the engineering environment of spur (cylindrical) gears with curved directrix, of the corresponding cutting procedures, machines and tools, as well as of their evident potential benefits, particularly in mechanical power transmissions, the amount of information available in relation to this type of gears is limited and scarce in literature. The paper presents results of recent research [11] finalized by the development of the kinematic structure of a machine for cutting spur gears with circular arc directrix by face milling, the cutter teeth being located along a circular contour at a uniform pitch. The teeth are cinematically generated based on the principle of fixed rack rolling, the cutting being achieved "space by space", thus by discrete indexing. The paper further presents the limitations of gears of the considered type, as well as subsequent directions of study and research.

 

Key words: machine-tools, gear cutting, circular arc directrix gears.

 

Authors:

PhD, Eng, Romeo CIOARĂ, Professor, "Transilvania" University of Brasov, Economic Engineering and Production Systems Department,

E-mail: cioarar@unitbv.ro

 

pp. 55-58

 

STATIC STRESS PERFORMANCE ANALYSIS USING THE FINITE ELEMENTS METHOD OF THE FUS 25 MILLING MACHINE BEFORE REMANUFACTURING

 

Dinu DARABĂ, Constantin DOGARIU, Marius ALEXANDRESCU

 View full text

 

Abstract: The finite element method is a numerical method used for solving the complex issues of engineering. The method comprises of meshing the continuous environment through assemble of finite elements, which interact between them in a finite number of nodes. The interacting forces of the nodes of the model characterize the actions of the interior forces or stresses that are applied upon the contours of the neighboring elements. Remanufacturing is the activity which combines the profitability and the benefits of the sustainable development, thus reducing the landfills and virgin raw material consumption, energy and specialized labor used in production.

 

Key words: finite elements method, remanufacturing, rigidity static, nodes.

 

Authors:

PhD, Eng, Ec, Dinu DARABĂ, Lecturer, North University of Baia Mare, Industrial Systems and Technology Management Department,

E-mail: dinu.daraba@ubm.ro

PhD, Eng, Constantin DOGARIU, Professor, University "Politehnica" of Bucharest,

E-mail:  cdogariu@gmail.ro

PhD, Eng, Marius ALEXANDRESCU, Lecturer, North University of Baia Mare, Industrial Systems and Technology Management Department,

E-mail: Marius.Alexandrescu@ubm.ro

 

pp. 59-62

 

Method of Kinematic synthesis for the feed and thread box of the conventional lathes
 

Dumitru DUMITRU

 View full text

 

Abstract: The kinematic synthesis of the adjustment mechanisms, feeds and threads boxes type, supposes the determination of some transmission ratios for a big number of gears, which to meet simultaneously two conditions: when the motion is transmitted in one direction, the transmission ratios, necessary for the obtaining of the Metric or Module threads pitches, to be provided and when the motion is transmitted in the opposite direction, the transmission ratios, necessary for the obtaining of the Whitworth and Diametral Pitch threads pitches, to be provided. In this paper, for the kinematic synthesis of the feeds and threads boxes from the machine-tools structure, a new method is shown, which contributes to the achievement of their kinematic and constructive parameters optimization.

 

Key words: kinematic synthesis, threads and feeds box.

 

Author:

PhD, Dumitru DUMITRU, Lecturer, Valahia University of Târgovişte, Mechanical Department

E-mail: ddumitru@valahia.ro

 

pp. 63-68

 

CYLINDRICAL GEAR TOOTH PROCESSING BY HOBBING CUTTER ON CNC LATHES
 

Adrian GHIONEA, George CONSTANTIN, Dumitru CATRINA, Nicolae PREDINCEA

 View full text

 

Abstract: The papers highlights principles an correlations imposed to the generation motions of the spur gear teeth on CNC lathes. Some specific to CNC lathes kinematic structures are presented. The kinematic structure of the lathe consists of rotation and translation couples. The relations that contain the constructive parameters of the tool and workpiece and also of the generation kinematics are determined. The input variable of the kinematic chains are supplied by electric motors with continuous adjustable speeds. For emphasizing the processing possibilities of the tooth flanks, a kinematic structure of a CNC revolver lathe is considered and also its kinemtic couples, generation motions and speed adjustment possibilities.

 

Key words: generation motions, kinematic structure, kinematic and technological parameters, gear,

CNC lathe.

 

Authors:

PhD, Eng, Adrian GHIONEA, Professor, University "Politehnica"of Bucharest, Machine and Manufacturing Systems Department,

E-mail: adrianghionea@yahoo.com

PhD, Eng, George CONSTANTIN, Professor, University "Politehnica"of Bucharest, Machine and Manufacturing Systems Department,

E-mail: geo@fh-konstanz.de

PhD, Eng, Dumitru CATRINA, Professor, University "Politehnica" of Bucharest, Machine and Manufacturing Systems Department,

E-mail: catrinad@imst.msp.pub.ro

PhD, Eng, Nicolae PREDINCEA, Professor, University "Politehnica" of Bucharest, Machine and Manufacturing Systems Department,

E-mail: nicolaepredincea@yahoo.com

 

pp. 69-74

 

THE EVOLUTION AND TECHNICAL PERFORMANCES OF MACHINING CENTRES

 

Adrian GHIONEA, Dumitru CATRINA, Cicerone Laurenţiu POPA

 View full text

 

Abstract: The diversity of machining centres determined that the analysis in the paper be made based on more criteria: the functional and technical characteristics, the kinematic structure, the placement and capacity of the tool magazine, the performance of the driving and command system, the modulation degree. Significant date are presented, referring to the configuration of the kinematic chains, the number of axes numerically controlled, the technical performances, the type of the base machine tool, the manufacturing possibilities. The schematic representations use symbols and notation which are attributed to the structure elements and to the movement generating components. The number of axes numerically controlled determines the number of feed/positioning kinematic chains. The synthetic data are based on the analysis of a large number of such machine tools, many of which recently manufactured.

 

Key words: elements and components, configuration, kinematic structures, technical performances.

 

Authors:

PhD Eng. Adrian GHIONEA, Professor, University Politehnica of Bucharest, Machine and Manufacturing Systems Department,

E-mail: adrianghionea@yahoo.com

PhD Eng. Dumitru CATRINA, Professor, University Politehnica of Bucharest, Machine and Manufacturing Systems Department,

E-mail: catrinad@imst.msp.pub.ro

PhD Eng. Cicerone Laurenţiu POPA, Lecturer, University Politehnica of Bucharest, Machine and Manufacturing Systems Department,

E-mail: laur.popa79@gmail.com

 

pp. 75-78

 

THEORETICAL ASPECTS CONCERNING SURFACE MACHINING WITH NUMERICALLY CONTROLLED MACHINE TOOLS

 

Roxana GREJDANESCU, Valeriu AVRAMESCU

 View full text

 

Abstract: This paper represents a study about numerically controlled machine tools and utilization of tools on these machines. Obtaining very good precisions and smallest roughness requires high performance both on machine side and on cutting tools with their fixing devices. In the paper is presented also, like application, a new virtual concept of multifunctional machine tool with large number of axis.

 

Key words: machine, tool, multifunctional, CNC, surface, machining.

 

Authors:

Eng, Roxana GREJDANESCU, PhD student, University "Politehnica" of Bucharest, Researcher at ICTCM Bucharest;

E-mail: groxana80@yahoo.com

Eng. Valeriu AVRAMESCU, Researcher II, ICTCM,

E-mail: vavramescu@ictcm.ro

 

pp. 79-82

 

MODELING THE RIGIDITY OF THE MAIN SPINDLE IN CASE OF HIGH SPEED MILLING
 

Daniel POPESCU, Mirela CHERCIU

 View full text

 

Abstract: The paper presents a mathematical model for establishing the dynamic rigidity of high speed spindles. The model is constructed based on constructive characteristics of real spindles and on rigidity simulation as function of speed and external load.

 

Key words: modeling, rigidity, main spindle, high-speed, milling.

 

Authors:

PhD, Daniel POPESCU, Assoc. Professor, University of Craiova, Faculty of Mechanical Engineering,

E-mail: daniel.popescu1119@yahoo.com

PhD, Mirela CHERCIU, Assoc. Professor, University of Craiova, Faculty of Mechanical Engineering,

E-mail: mirela_cherciu2005@yahoo.com

 

pp. 85-90

 

ANALOG CONTROL AND PROGRAMMING OF A RTT ROBOT WITH A PLC

 View full text

 

Laurean BOGDAN

 

Abstract: Rotation, translation, translation (RPP) robot on which reference is made in this work is the subject of the patent. This paper presents the possibility of analog programming and control of a structure of industrial robot. The RPP  robot is designed and manufactured within the Faculty of Engineering from “Lucian Blaga” University of Sibiu,  as a patent no. 112418 CI6.B25J 18/02. Classical systems for programming and control of industrial robots are based on numerical control equipment developed around a PC. Programmable Logic Controllers (PLC) have proven to be viable alternatives to driving machine tools, industrial systems and Robots. PLC is well-suited for industrial environment. The paper highlights the simplicity and ease of configuration control and programming of the robot arm using a PLC with the time required by the mechanical structure. It proposed a method of programming and analog control.

 

Key words: industrial robot, programmable logical controller, analog programming and control.

 

Authors:

PhD, Laurean BOGDAN, Professor, University "Lucian Blaga" of Sibiu, Faculty of Engineering, Romania,

E-mail: laurean.bogdan@ulbsibiu.ro

 

pp. 91-98

 

SOFTWARE and hardware ARCHITECTUREs of the Internet-based

Robotic Systems for remote operation

 

Alexandru DORIN, Adrian Florin NICOLESCU, Stelian POPA

 View full text

 

Abstract: The virtual reality applications are spread in many fields and this technology becomes increasingly used. This paper accomplish a survey between different software and hardware solutions developed by different universities which allow to the human operator to simulate in virtual environment the work of a real industrial robot and carry out operations with the real robot through remote operation.

 

Key words: teleoperation, telerobotics, virtual reality, remote laboratory, Internet.

 

Authors:

PhD, Eng, Alexandru DORIN, Professor, University "Politehnica" of Bucharest, Department of Machines and Manufacturing Systems,

PhD, Eng, Adrian Florin NICOLESCU, Professor, "Politehnica" University of Bucharest, Department of Machines and Manufacturing Systems,

E-mail: afnicolescu@yahoo.com,

Eng, Stelian POPA, PhD Student, "Politehnica" University of Bucharest, Department of Machines and Manufacturing Systems

 

pp. 99-102

 

SPECIFIC RISKS FOR ROBOTIZED APPLICATIONS

 

Ion-Bogdan LUNGU, Constantin ISPAS

 View full text

 

Abstract: The investment in robotized solutions for industrial processes follows different objectives like productivity, quality or improving the personal working environment. Fulfillment of such objectives creates an important pressure on the producers and increases the market competitiveness. For that, the companies must analyze each application and determine its characteristics and risks.  The paper analyses two different robotized applications, welding and palletizing, in order to determine the specific risks impact on automation common objectives. Knowing in advance what and why certain things will happen in a robotized workcell, creates an important advantage, providing full control on the expected results.

 

Key words: industrial robots, applications, risk, palletizing, welding.

 

Authors:

Eng, Ion-Bogdan LUNGU, PhD Student, University "Politehnica" of Bucharest, Machines and Production Systems Department,

E-mail: lungu_ib@yahoo.com

PhD, Dr. H.C., Constantin ISPAS, Prof.essor, University "Politehnica" of  Bucharest, Machines and Production Systems Department,

E-mail: ispas1002000@yahoo.fr

 

pp. 103-106

 

DESIGN OF NETWORK MODEL FOR HOT BILLETS AUTOMATIC-LOADING SYSTEM FOR PRODUCTION OF ALUMINIUM PROFILES

 

Ivo MALAKOV, Georgi GEORGIEV, Roman ZAHARIEV

 View full text

 

Abstract This paper presents the results from development of multitude structures variants for network model for hot billets automatic-loading system for production of aluminum profiles. For this purpose on the base of the system approach was built functional model of the system and were designed elementary executer devices which execute the partial function of the system. Compatibility between them is defined, this is, the possibility for collaboration in joint structure. The multitude of structure variants is present through network model.

 

Key words:  network model, extrusion, automatic loading and elementary executer device.

 

Authors:

PhD, Ivo MALAKOV, Assoc. Professor, Technical University of Sofia, Mechanical Engineering Faculty, Dept. Automation of Discrete Production Engineering,

E-mail: ikm@tu-sofia.bg

Eng, Georgi GEORGIEV, PhD Student, Technical University of Sofia, Mechanical Engineering Faculty, Dept. Automation of Discrete Production Engineering,

E-mail: georgi6@abv.bg

PhD, Roman ZAHARIEV, Assoc. Professor, Bulgarian Academy of Sciences, Central Laboratory of Mechatronics and Instrumentation, Dept. Mechatronics Handling Mechanisms and Systems,

E-mail: roman@clmi.bas.bg

 

pp. 107-112

 

ASSISTED OPTIMIZATION OF THE DYNAMIC BEHAVIOUR OF INDUSTRIAL ROBOTS
 

Adrian OLARU, Şerban OLARU, Aurel OPREAN

 View full text

 

Abstract: The paper presents some new methods for analyze and optimization of the industrial robots dynamic behavior. The methods consist in on-line simulation of the real and frequency characteristics for the elements, systems and structures and compare them with the experimental characteristics obtained by data acquisition with the virtual LabVIEW proper instruments. The paper presents many virtual instruments for analyzing the hydraulic, electric and pneumatic motors, the complex systems with many closed loops, the electrical and mechanical corrections, and some complex schemas with different control laws. All the instruments have the possibility to show on-line, and to see what is happening when changing one of the functional or the constructive parameters. For analyzing and optimization the elements and the systems are presented some instruments for comparative analyze. These methods and all created virtual LabVIEW instruments can be applied in many others mechanical systems.

 

Key words: assisted optimization, dynamic behavior, LabVIEW instrumentation, industrial robots.

 

Authors:

PhD, Eng, Adrian OLARU, Professor, Head of the Dynamic Behavior Robot Laboratory, University "Politehnica" of Bucharest, Machines and Manufacturing Systems Department,

E-mail: aolaru_51@yahoo.com

Eng, Şerban OLARU, PhD Student, engineer in mechatronics systems, RomSYS Company, Technical Department,

E-mail: serban1978@yahoo.com

PhD, Eng, Aurel OPREAN, Professor, member of the Romanian Academy of Technical Sciences, vice president of the section II, University "Politehnica" of Bucharest, Machines and Manufacturing Systems Department, E-mail: oprean.aurel@yahoo.com

 

pp. 113-118

 

STRATEGY FOR CONTROL OF A HYBRID MACRO-MICRO ROBOT WITH A 5-LINK CLOSED STRUCTURE – AN INVERSE PROBLEM OF KINEMATICS

 

Tihomir TIANKOV, Penka GENOVA, Vladimir KOTEV, Kostadin KOSTADINOV

 View full text

 

Abstract: The combination of robots for macro and micro operations is necessary for performing a large number of technological operations where macro motions precede finishing high accuracy motions. The basic difference between the two manipulation systems (MS) is the type of actuations used. The present study offers algorithms for solving inverse problem of kinematics (IPK) related to a macro MS without linearizations and IPK for a micro MS which is redundant, having two extra degrees of freedom. Conditions for unidirectionality of the basic links of a micro MS are assumed. A virtual model of a robotized system is developed and presented on the basis of the algorithms designed for solving the IPK. The robotized technical solution can be useful for cell manipulations where high precision and high speed of cell injection are required.

 

Key words: macro-micro actuators, manipulation system, inverse problem of kinematics.

 

Authors:

PhD, Eng, Tihomir TIANKOV, Bulgarian Academy of Sciences – Institute of Mechanics,

E-mail: tihomir@imbm.bas.bg

PhD, Eng, Penka GENOVA, Professsor, Bulgarian Academy of Sciences – Central Laboratory of Mechatronics and Instrumentation,

E-mail: pgen@tu-sofia.bg

PhD, Eng, Vladimir KOTEV, Bulgarian Academy of Sciences – Institute of Mechanics,

E-mail: kotev@mech.bas.bg

PhD,  Eng, Kostadin KOSTADINOV, Assoc. Professor, Bulgarian Academy of Sciences – Institute of Mechanics,

E-mail: kostadinov@imbm.bas.bg

 

 3. MACHINES AND EQUIPMENTS

 

pp. 121-124

 

 CONTRIBUTIONS ON THE PHYSICAL MODELING OF THE MAGNETO – ABRASIVE FINISHING PROCESS WITH FERROFLUIDS. MACHINES AND EQUIPMENTS

 

Mircea CIOBANU, Marius BĂEŞU

 View full text

 

Abstract: In this work are presented some contributions concerning the physic modeling of the magneto-abrasive process with ferrofluids which contain abrasives granules and some requests on the installation and subassemblies using the magneto-abrasive method.

 

Key words: magneto-abrasive finishing, ferrofluids, machines; equipments.

 

Authors:

PhD, Eng, Mircea CIOBANU, Professor, University of Suceava, Technologies and Management Department,

E-mail: mircea@fim.usv.ro

Eng, Marius BĂEŞU, University of Suceava, Technologies and Management Department,

E-mail: marius.baesu@fim.usv.ro

 

pp. 125-128

 

MICROSTRUCTURE CHANGES OF CONSTRUCTIONAL STEEL CAUSED AFTER CUTTING WITH OXYGEN
 

Michal HATALA

 View full text

 

Abstract: The article deals with the technology of thermal cutting material with oxygen. In the firs part, it deals with the theoretical knowledge of the principle of cutting with oxygen and the current use of the technology in industry. The cut of products using this technology is perpendicular and accurate but using it affects the structure by microstructural changes and the depth of heat affected zone (HAZ). The heat used in process of cutting the material affects its microstructure.

 

Key words: cutting, oxygen, microstructure, heat affected zone (HAZ).

 

Author:

PhD, Eng, Michal HATALA, Researcher, Faculty of Manufacturing Technologies TU Košice, Prešov, Slovakia, Department of Manufacturing Technologies,

E-mail: michal.hatala@tuke.sk

 

pp. 129-132

 

REGARDING THE DETERMINATION OF ENERGETIC CHARACTERISTICS OF

THE LINEAR ELECTROMECHANICAL ACTUATORS FOR THE MACHINE-TOOLS

 

Vasile NĂSUI, Mircea LOBONŢIU, Marius COSMA, Vlad DICIUC

 View full text

 

Abstract: The paper presents the results of researches regarding determination of the functional parameters that characterize the energetic expression of the linear actuators. The optimization of the working conditions on the basis of the energetic characteristics of linear electromechanic actuator leads to the rational use of the operating system of the trained equipment and the electric power.

 

Key words: linear electromechanic actuator, virtual simulation, energetic characteristics.

 

Authors:

PhD, Vasile NĂSUI, Professor, North University of Baia Mare, Romania,

E-mail: nasuiv@ubm.ro

PhD, Mircea LOBONŢIU, Professor, North University of Baia Mare, Romania,

E-mail: mircea.lobontiu@ubm.ro

PhD, Marius COSMA, Lecturer North University of Baia Mare, Romania,

E-mail: marius.cosma@ubm.ro

MSc, Eng, Vlad DICIUC, North University of Baia Mare, Romania,

E-mail: vlad.diciuc@ubm.ro

 

pp. 133-136

 

FLANGED JOINT TIGHTNESS AND FLANGE’S RIGIDITY INFLUENCE

 

Mihaela PĂUNESCU, Constantin TACĂ

 View full text

 

Abstract: This paper presents the results of an experimental research about the tightness of flanged joint, equipped with gaskets from marsit. As a consequence of the experimental data processing, the calculation relations of the tightening of the gaskets, depending on the inner pressure and on the gasket dimensions are established. As well, was quantified the influence of circumferential deformation of flanges about the specific pressure on the gasket.

 

Key words: flanged joint, pressure vessel, gasket, tightness, seals.

 

Authors:

PhD, Eng, Mihaela PĂUNESCU, Assoc. Professor, University "Politehnica" of Bucharest, Department of Mechanical and Mechatronical Engineering,

E-mail: mpaunescu2002@yahoo.com

PhD, Eng, Constantin TACĂ, Professor, University "Politehnica" of Bucharest, Department of Mechanical and Mechatronical Engineering,

E-mail: constantin.taca@gmail.com

 

pp. 137-140

 

SELF OSCILLATORY HIGH PRESSURE (70 MPA) MULTIPLIERS, WITH LOGIC HYDRAULIC ELEMENTS, FOR HYDRO-FORMATION LIQUIDS, EXPERIMENTAL RESULTS
 

Mircea FRUNZĂ, Boris PLAHTEANU

 View full text

 

Abstract: This paper presents the experimental results of the experimental equipment of the self oscillatory high pressure (70 MPa) multipliers, with logic hydraulic elements, for hydro-formation liquids, as part of a national research contract, which is relating to a flexible modular system for plastic deformations true hydro formations with high hydraulic pressure, with a high level of technology for producing complex parts for auto vehicle construction technology, aeronautics or top industrial fields. The experimental results from the experimental equipment where achieved through a National Instruments interface and analyzed with a specialized software, Mathlab. The confirmation of the theoretical models are checked throw comparison with experimental results through data acquisition from the real model.

 

Key words: Hydro-formation, dynamic, high-pressure, simulation, multiplier.

 

Authors:

PhD, Eng, Mircea FRUNZĂ, Research Scientist, National Inventics Institute, Iasi, Romania,

E-mail: mirceafrunza@yahoo.com

PhD, Eng, Boris PLAHTEANU, Professor, General Manager, National Inventics Institute, Iasi, Romania,

E-mail: plahteanu@yahoo.com

 

pp. 141-144

 

Researches concerning THE RHEOLOGY OF FRESH AND USED LUBRICANTS

 

Irina RĂDULESCU, Alexandru V. RĂDULESCU, Diana BROBOANĂ

 View full text

 

Abstract: The present paper describes researches concerning the achievement of an informatics device for the lubricants wear behaviour. Methods and results obtained at national and international levels and, also, in the actual research project are presented. Several methods for rheological tests by comparing fresh and used oils in shear movement are presented also. The actual project develops a scientifically partnership for the idea of a fast diagnosis method for liquid lubricants (used for cars, air ships, sea ships, engines and different systems).

 

Key words: informatics device, lubricant, rheological test, fresh and used oils.

 

Authors:

Eng, Irina RĂDULESCU, PhD Student, Industrial Liaisons Office Manager, S.C. ICTCM S.A. Bucharest, Romania, CITAf Department

E-mail: iradulescu7@gmail.com

PhD, Eng, Alexandru V. RĂDULESCU, University "Politehnica" of Bucharest, Romania,

E-mail: sandu@meca.omtr.pub.ro

PhD, Eng, Diana BROBOANĂ, University "Politehnica" of Bucharest, Romania,

E-mail: diana.broboana@gmail.com

 

pp. 145-148

 

AUTOMATIC TRANSFER SYSTEM FOR CHARGING/EVACUATING OF THE WORKINGPOST USED TO ASSEMBLY/TEST THE SUBSYSTEM-CARCASS

 

Dorin TELEA, Ştefan BARBU, Ilie POPP

 View full text

 

Abstract: This paper presents the main CAD – computer aided design – elements of an automatic transfer system, air-driven, destined for some charging/disposal operation of some work posts for the assembly/testing of the subsystem-carcass, in agreement with Compa SA Sibiu. The carcass, the manipulated subsystem, is part of the turbo-compressor assembly (compressor + turbine) – of a testing equipment. The analyzed manipulator for the handling of 7 work posts, with direct application to the charging with disc type subsystems from subsystem palletainers, can be generalized to the serving, to the purpose of testing, of many such posts in a automatised assembly line and carcass checking.

           

Key words: automatised transfer system, charging/evacuating system.

 

Autors:

PhD, Eng, Dorin TELEA, Professor, "Lucian Blaga" University of Sibiu, Faculty of Engineering "Hermann Oberth”, Department of Machines and Equipments,

E-mail: telea.dorin@ ulbsibiu.ro

PhD, Eng, Ştefan BARBU, Professor, "Lucian Blaga" University of Sibiu, Faculty of Engineering "Hermann Oberth”, Department of Machines and Equipments,

E-mail: stefan.barbu@ulbsibiu.ro

PhD, Eng, Ilie POPP, Assoc. Professor, "Lucian Blaga" University of Sibiu, Faculty of Engineering "Hermann Oberth”, Department of Machines and Equipments,

E-mail: ilie.popp@ulbsibiu.ro

 

4. DRIVING SYSTEMS AND CONTROL SYSTEMS

 

pp. 151-156

 

RESEARCHES CONCERNING THE USE OF ELECTROHYDRAULIC SERVOSYSTEMS TO COLDWORKING MACHINES

 

Ioan BÂRSAN, Ilie POPP

 View full text

 

Abstract: This paper present some researches concerning the stability in use of cold-working machines driven with electro-hydraulic servo-systems such as hydraulic linear amplifiers. In this work, a complex synthesis of electro-hydraulic servo-systems used in driving machines and industrial robots is also presented. The researches conducted upon a particular system, reveal the optimum design elements for obtaining a good behaviour in use, subsequently a good stability in use.

 

Key words: electro-hydraulic, servo-systems, analysis, dynamic stability.

 

Authors:

PhD Eng. Ioan BÂRSAN, Prof., "Lucian Blaga" University of Sibiu, Faculty of Engineering "Hermann Oberth", Department of Machines and Machinerys,

E-mail: ioan.barsan@ulbsibiu.ro,

PhD Eng. Ilie POPP, Assoc. Prof., "Lucian Blaga" University of Sibiu, Faculty of Engineering,

E-mail: ilie.popp@ulbsibiu.ro

 

pp. 157-160

 

STAND FOR TESTING OF THE HYDRAULIC SYSTEMS FOR RECOVERING THE KINETIC ENERGY FROM ROAD MOTOR VEHICLES

 

Corneliu CRISTESCU, Petrică KREVEY, Constanţa CRISTESCU

 View full text

 

Abstract: The paper presents several issues on the need to promote hybrid propulsion system of road vehicles, which follow the recovery of kinetic energy in braking phase, in order of energy efficiency and reduce emissions. In this sense, it is said mechatronic system for the recovery of energy that has been achieved in one CEEX project. In the article is presented a testing stand which was, especially designed for testing the hydraulic system for recovery the kinetic energy. The testing stand  is based on simulation the braking and starting regimes of the road motor vehicles,  by electro hydraulic means. The stand was made, also in the CEEX research project and is one of the physical results of it.

 

Key words: testing stand, hydraulic systems, hybrid systems, road vehicles, energy recovery system.

 

Authors:

PhD, Eng, Corneliu CRISTESCU, Senior Researcher,  INOE 2000-IHP Bucharest, General Hydraulic Department,

E-mail: cristescu.ihp@fluidas.ro,

Eng, Petrică KREVEY, Scientific Researcher, INOE 2000-IHP Bucharest,

Eng, Constanţa CRISTESCU, Scientific Researcher, INOE 2000-IHP Bucharest.

 

pp. 161-164

 

Experimental system for monitoring of operational vibrations
 

Tibor Krenicky, Radoslav KREHEL

 View full text

 

Abstract: Reliability of the production systems depends on the standard of maintenance. Number, duration and cost of such a service can be optimized using diagnostic systems that perform evaluation of the manufacturing system condition. For many applications, portability and flexibility of the diagnostic system is crucial. In this paper, experimental system designed to monitor, evaluate and indicate operational vibrations is presented. The system was developed at Technical University of Košice, Department of the manufacturing processes operation. The system is based on modular hardware and software platforms with using of the virtual instrumentation.

 

Key words: vibrations, monitoring system, virtual instrument, data acquisition.

 

Authors:

PhD, RNDr. Tibor Krenicky, Assistant lecturer, Technical University of Košice, Faculty of Manufacturing Technologies with a seat in Prešov, Department of Manufacturing Processes Operation,

E-mail: tibor.krenicky@tuke.sk

PhD, Eng, Radoslav KreheL, Researcher, Technical University of Košice, Faculty of Manufacturing Technologies with a seat in Prešov, Department of Manufacturing Processes Operation,

E-mail: radoslav.krehel@tuke.sk

 

pp. 165-168

 

FABRICATION AND REFABRICATION OF MACHINE TOOLS. LINEAR ELECTRIC MOTORS USED IN FEED/POSITIONING KINEMATIC CHAINS

 

Dan PRODAN, George CONSTANTIN

 View full text

 

Abstract: In this paper some specific aspects regarding fabrication and refabrication of feed kinematic chains of classical machine tools especially of CNC machine tools. The linear electric motors represents a modern solution, used increasingly by companies specialized in machine tools fabrication and refabrication. Starting from the mechanical structures of the new or old machines, by using these electric motors some feed systems are obtaining with advanced features in regard with those using rotary electric motors.

 

Key words: machine tools, fabrication, refabrication, feed kinematic chain, linear electric motors, characteristics, operation.

 

Authors:

PhD, Eng, Dan PRODAN, Professor, University "Politehnica" of Bucharest, Machine and Production Systems Department,

E-mail: prodan2004@yahoo.com

PhD, Eng, George CONSTANTIN, Professor, University "Politehnica" of Bucharest, Machine and Production Systems Department,

E-mail: george@imst.msp.pub.ro

 

pp. 169-172

 

A NEW VISION ABOUT OLD TECHNOLOGIES FOR ELECTRODEPOSITION

LINES USING PROGRAMMABLE LOGIC CONTROLLER (PLC)

 

Alexandru STĂNESCU, Ştefan VELICU, Aurelia STĂNESCU, Alexandru VELICU

 View full text

 

Abstract: The purpose of the paper is to create a complex operating modern installation based on a physical model. The model is also useful for upgrading existing installations that have a mechanized or semi-automatic management of the process. The upgrade of the production capacities will be obtained by using its infrastructure to inoculate modern computing technique.  Using an Excel developed program to calculate the time required for obtaining a certain thickness of the deposited layer, a calculation program was obtained using WinCC software. Using synoptic this program monitors and controls the maintaining time, temperature, level and movement for the parts that are being electrodeposited during the process. In order to assist the operator, the program has a database associated to the metallic material used for coating, thereby a simple editing of the metal name loads the necessary data to run the program. Given the flexibility of the management diagram, adaptation can be made for all the existing installations, changes can be performed according to needs. The software is designed to improve both the quality of the products and the performance of metal depositions installations.

 

Key words: electrodepositing, automation, monitoring, PLC , optical sensors.

 

Authors:

PhD, Eng, Alexandru STĂNESCU, AMCSIT-"Politehnica", Monitoring Department,

E-mail: alexandru.stanescu@amcsit.ro.

PhD, Eng, Ştefan VELICU, Professor, University "Politehnica" of Bucharest, Machine and Production Systems Department,

E-mail: velstefan@hotmail.com.

Eng, Alexandru VELICU, PhD Student, University "Politehnica" of Bucharest, Automatics and Computers Faculty,

E-mail : krbonsoft@yahoo.com

 

pp. 173-176

 

DYNAMIC IDENTIFICATION OF A HIGHSPEED MECHATRONICAL POSITIONING STRUCTURES
 

Аlexander STEFANOV

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Abstract: The positioning structures have a significant place in the modern manufacturing systems. The aim in the modern machines is involved with a continuous growth in a machine performance, without loose of the positioning accuracy in a high dynamics operations. The goal for this solution is in defining and optimizes the dynamics performance parameters of the structure into the design process.

 

Key words: mechatronics, positioning, error, structure, dynamics, simulation.

 

Author:

Eng, Alexander STEFANOV, PhD student, TU-Sofia, Mechanical Engineering Faculty,

E-mail: astefanov@3clab.com

 

5. CUTTING AND CUTTING TOOLS

 

pp. 179-182

 

NEW FUNCTIONS OF THE SURFACE ROUGHNESS WHEN TURNING THE STAINLESS STEEL 13H11N2V2MFS AND OLC45
 

Husen AL SAHOU, Maturin SIME, Aurelian VLASE

 View full text

 

Abstract: The paper presents the experimental results and their evaluation when cutting the stainless steel 13H11N2V2MFS and standard steel OLC45, the latest as for comparison. Later on, the regression mathematical relations for roughness Ra are determined, as a function of cutting process parameters, using a standard finishing cutting tool. The study contains three tables, two regression functions and six graphs with the roughness Ra variation, according to the evolution of cutting parameters.

 

Key words: roughness, cutting, regression.

 

Authors:

Eng, Husen AL SAHOU, PhD Student, University "Politehnica" of Bucharest, Chair of Production Engineering, Products Manufacturing Technologies Laboratory,

E-mail: sahouyado@yahoo.com

Eng, Maturin SIME, PhD Student, University "Politehnica" of Bucharest, Chair of Production Engineering, Products Manufacturing Technologies Laboratory,

E-mail: sopsime@yahoo.fr

PhD, Aurelian VLASE, Professor, University "Politehnica" of Bucharest, Chair of Production Engineering, Products Manufacturing Technologies Laboratory,

E-mail: avlase@yahoo.com

 

pp. 183-186

 

 A SOFTWARE PROGRAMME FOR TOOTH PROFILING OF WORM HOBS

FOR CUTTING GEAR PUMP COGWHEELS

 

Desislava ATANASOVA, Yuliyan MLADENOV

 View full text

 

Abstract: The tooth profiling in normal section of teeth for cutting cogwheels for gear pumps with involute profile is described. Due to the small number of cogwheel teeth, their profile could be realized with a change of the shape of the worm hob’s tooth head. A new original decision of dimensioning of the hob’s tooth is offered. It helps to control the cogwheel’s tooth profile and the right mesh of the tooth pair. The main problems, connected with profiling and control of solutions obtained, are represented in a software program. With some transformations, this program could be used for profiling of worm hobs for other cogwheels as well.

 

Key words: thread milling tool, profiling, cogwheel, software system.

 

 Authors:

PhD, Desislava ATANASOVA, Assistant Prof., Rousse University, Department of Informatics and Information Technologies,

E-mail: datanasova@ami.ru.acad.bg

PhD, Yuliyan MLADENOV, Assoc. Prof., Rousse University, Department of Machine Tools & Manufacturing,

E-mail: jmladenov@ru.acad.bg

 

pp. 187-190

 

CROSS SECTION STUDY OF THE UNCUT CHIP IN 5 AXES BALL NOSE END MILLING FOR THE SECOND QUADRANT OF THE TOOL INCLINATION
 

Marius COSMA, Dinu DARABĂ, Marius POP

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Abstract: The current paper looks into and assesses some aspects regarding the geometric simulation of the chip generating mechanism in 5 axes ball nose end milling. The cross section variation of the uncut chip produced by a ball nose cutter is very complicated.  The influence of tool inclination, however, was not considered in the machining strategy, starting with the tool path program in CAM software which allows the management of various ways of tool path generation, but cannot decide which one is the best. The present study advances, with minimal approximation, a geometrical method to establish the volume of the uncut chip and area variation of the cross section, obtained in 3D-CAD (AutoCAD 2007) by four surfaces intersection. Both  rotations in 5 axes are considered for the tool, in negative sense for A axis (A-) and positive for B axis (B+) for 0 to 30 degree range (second geometrical quadrant).

 

Key words: ball nose end mill, uncut chip, cutting edge, cross section area, milling.

 

Authors:

PhD, Eng, Marius COSMA, Lecturer, North University of Baia Mare, Department of Industrial Systems and Technological Management,

E-mail: marius.cosma@ubm.ro

PhD, Eng, Ec, Dinu DARABĂ, Lecturer, North University of Baia Mare, Department of Industrial Systems and Technological Management,

E-mail: dinu.daraba@ubm.ro

Eng, Marius POP, S.C. RAMIRA S.A. Baia Mare, CAD/CAM/CNC Technology Department,

E-mail: mm05uot@yahoo.com

 

pp. 191-194

 

Method for Multi-EDGE Drills with Curved Cutting Edge Sharpening
 

Gabriel FRUMUŞANU, Nicolae OANCEA

 View full text

 

Abstract: Multi-edge drills are constructions of tools for drilling in bulk pieces, characterized by a better tool alignment during the drilling process, as consequence of both pyramidal cutting edge shape and higher circularity precision of hole, last one due to the greater number of guiding flats. The construction of multi-edge drills, having a variable setting angle along the major cutting edge can also bring to these tools a higher durability, relative to the drills with straight cutting edges. This new constructive shape of the drill requires specific sharpening methods to be used. In this paper, there are suggested a specific kinematics and the analysis of the main aspects concerning the new sharpening method – the clearance along the major cutting edge and the relieving of the major flank.

 

Key words: multi-edge drill, curved cutting edge, sharpening method, clearance, relieving.

 

Authors:

PhD, Gabriel FRUMUŞANU, Professor, "Dunărea de Jos" University of Galati, Manufacturing Science and Engineering Department,

E-mail: gabriel.frumusanu@ugal.ro.

PhD, Nicolae OANCEA, Professor, "Dunărea de Jos" University of Galati, Manufacturing Science and Engineering Department,

E-mail: nicolae.oancea@ugal.ro

 

pp. 195-198

 

MICROSTRUCTURE CHANGES OF CONSTRUCTIONAL STEEL CAUSED AFTER CUTTING WITH CIRCULAR SAW
 

Michal HATALA, Jozef ZAJAC

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Abstract: The article deals with technology of cutting material using the circular saw. In the first part it is addicted to theoretical knowledge of the principle of cutting with saws and current use of the technology in industry. The cut of products of this technology is perpendicular and accurate but reaches variant values of roughness and using of this technology affects microstructural and hardness changes in the base material. This article presents quality of cut surfaces after cutting with this technology, pictures of microstructural changes of material and quality of the cut surface .

 

Key words: circular saw, quality, roughness, hardness.

 

Authors:

PhD, Eng, Michal HATALA, Researcher, Faculty of Manufacturing Technologies TU Košice, Prešov, Department of Manufacturing Technologies, Slovakia,

E-mail: michal.hatala@tuke.sk

PhD, Eng, Jozef ZAJAC, Professor, CSc, Faculty of Manufacturing Technologies TU Košice, Prešov, Department of Manufacturing Technologies, Slovakia,

E-mail: jozef.zajac@tuke.sk

 

pp. 199-202

 

PLASTIC DEFORMATION AND PHENOMENA IN ZONE CUTTING AT DRILLING OF STAINLESS STEEL
 

Jozef JURKO, Anton PANDA

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Abstract: In this paper, sintered stainless steel were machined with several kinds of conventional tools and newly developed tools, and the machinability was evaluated in relation to cutting force, cutting temperature, tool wear, tool life, surface finish and surface quality. Machinability was evaluated using various grades of high speed steels by drilling. A test method for evaluating tool wear under interrupted machining modes conditions and the associated machinability of work materials is presented. Systematic drilling involving a number of programmed tool interruptions resulting in different combinations of cutting and idle durations were used to develop a standard test method. The study indicated the critical role of the duration of the cutting cycle as well as the transient stage associated with tool entry and withdrawal upon the observed tool wear. How tool life in drilling can be improved considerably. Machining recommend-dations are given for drilling the stainless steels with austenite structure. The paper described the phenomena, which influencing on the twist drill by drilling holes. Research and development of the phenomena its very important for the next problem solution by drilling. The cutting part of twist drill is frequently the tool wear (for example fracture of cutting part) in the tool peak point and by chisel cutting edge. This is problems is very important and use for very difficult the machinability materials. The results of experimental verifying of the tools for the tool life of twist drill.

 

Key words: machinability, cutting, drilling, stainless steel, plastic deformation.

 

Authors:

Eng, Jozef JURKO, Faculty of Production Technology, Technical University in Košice with seat in Prešov.

E-mail: jozef.jurko@tuke.sk

Eng, Anton PANDA, Faculty of Production Technology, Technical University in Košice with seat in Prešov,

E-mail: anton.panda@tuke.sk

 

pp. 203-206

 

ABOUT THE WEAR CRITERION FOR CUTTING TOOLS
 

Mircea LOBONŢIU, Vlad DICIUC, Vasile NĂSUI

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Abstract: The current paper deals with the concept of tool wear and aspects derived from its connection to different input or output factors of the cutting process. Subsequent to a series of experiments on various cutting systems, a concept of wear criterion in the cutting system is to be proposed and substantiated by theoretical premises as well as by the experimental data.

 

Key words: tool life, wear criteria, ball nose end mill.

 

Authors:

PhD, Eng, Mircea LOBONŢIU, Professor, , North University of Baia Mare, Romania,

Email: mircea.lobontiu@ubm.ro

MSc, Eng, Vlad DICIUC, North University of Baia Mare, Romania,

Email: vlad.diciuc@ubm.ro

PhD, Eng, Vasile Nasui, Professor, North University of Baia Mare, Romania,

Email: vasile.nasui@ubm.ro

 

pp. 207-210

 

CHIP FORMING AND FORMS IN MILLING AND DRILLING ZINC ALLOYS

 

Constantin MINCIU, Sorin Mihai CROITORU, Andra LIŢĂ

 View full text

 

Abstract: Manufacturing ability of a material and cutting capacity of a cutting tool, as well, are evaluated by means of several criteria, among which chip forming and forms criterion. This becomes important when for protection of human operator and technological system the detached chips must not be continuous (flowing chips) and must have small dimensions. Many important technological aspects – chip evacuation, cutting temperature, cutting efforts, cutting tool durability, surface roughness and secondary plastic phenomena – are solved depending on the chips’ forming and forms. This paper presents a study on chip forming and forms in milling and drilling zinc alloy ZnAl4Cu1T, one of the most used zinc alloys.

 

Key words: cutting, chip, milling, drilling, zinc alloy, research.

 

Authors:

PhD, Eng, Constantin MINCIU, Professor, University "Politehnica" of Bucharest, Machines and Production Systems Department,

E-mail: minciu@imst.msp.pub.ro

PhD, Eng, Sorin Mihai CROITORU, Assoc. Professor, University "Politehnica" of Bucharest, Machines and Production Systems Department,

E-mail: sorin.croitoru@gmail.com

Eng, Andra LIŢĂ, PhD Student, University "Politehnica" of Bucharest, Machines and Production Systems Department,

E-mail: andra_lita@yahoo.com

 

pp. 211-216

 

PROFILING AND RUNNING CHECK OF THE OPERATING PART OF WORM CUTTERS FOR CUTTING OF STRAIGHT-LINE MULTIPLE SPLINE SHAFTS

 

Yuliyan MLADENOV

 View full text

 

Abstract: The present paper offers an innovative method of profiling and running check of worm cutters for cutting of multiple spline shafts with straight form line of teeth. The method determines the worm cutter tooth shape, which guarantees the accuracy of the multiple spline shafts at design stage.

 

Keywords: profiling method, multiple spline shaft, centroidal generation.

 

Author:

PhD, Yuliyan MLADENOV, Assoc. Professor., Rousse University, Department of Machine Tools & Manufacturing,

E-mail: jmladenov@ru.acad.bg

 

pp. 217-220

 

MONITORING OF VIBRATIONS DANGEROUS LIMITS IN MACHINING PROCESS OF BÖHLER M 201 MATERIAL

 

Jaromír MURČINKO, Zuzana MURČINKOVÁ

 View full text

 

 

Abstract: The vertical machining centre VMC 650S is a machine tool belonging to the Department of manufacturing technologies in Prešov. The problems of applied research AV 2/2022/08 are investigated through use of the mentioned machine. Such problems are for example verification of undesirable influence of vibrations for manufacturing of chosen materials intended for production of so called "soft" moulds. At the same time, the optimization of technological parameters for new kinds of tools is made. Article deals with description of measuring vibrations methods, measuring device, sensors and results of measuring.

 

Key words: monitoring, vibration, CNC machine, soft mould, amplitude, frequency.

 

Authors:

PhD, Eng, Jaromír MURČINKO, Researcher, Faculty of Manufacturing Technologies in Prešov, Technical University Košice, Department of Manufacturing Technologies,

E-mail: jaromir.murcinko@tuke.sk

PhD, Eng, Zuzana MURČINKOVÁ, Lecturer, Faculty of Manufacturing Technologies in Prešov, Technical university Košice, Department of Technological Devices Design,

E-mail: zuzana.murcinkova@tuke.sk

 

pp. 221-224

 

DETERMINING THE DRILLING TORQUES REGRESSION AT DRILLING IN COMPOSITE MATERIALS WITH POLYMERIC MATRIX AND 20% GLASS FIBRES
 

Constantin OCNĂRESCU , Maria OCNĂRESCU

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Abstract: Composite materials because of their physical and mechanical properties raise many problems when it comes to drilling. This article will present the experimental results and the analysis of the torque when drilling into composite materials with polymeric matrix and 20% glass fiber, using a special drill for these materials, made by HUFSCHMIED.The article contains an analysis of the variation of the drill torques as a function of drill parametric (feed rate, drill diameters and drilling speeds of the tool..

 

Key words: composite material, drilling, machining, torques regression, glass fiber.

 

Authors:

PhD, Constantin OCNĂRESCU, Professor, University "Politehnica" of Bucharest,

E-mail: constantinocnarescu@yahoo.com

PhD, Eng, Maria OcnĂrescu, "Doamna Stanca" High School,

E-mail: ocnarescu_maria@yahoo.com

 

pp. 225-230

 

CUTTING FORCES AND CONSECUTIVE DEFORMATIONS AT MILLING PARTS WITH THIN WALLS
 

Ioan TĂNASE, Ionuţ GHIONEA

 View full text

 

Abstract: Some results of experimental researches and CAD-CAM simulations at milling plane surfaces of thin walls parts are presented in the paper. The cutting force measurement was done using a multi-component quartz dynamometer with a special data acquisition system for the cutting forces. The elastic deformation and the stress values in the machined part were determined by experimental tests and simulated using the FEM analysis. Depending on data that geometrically define the part and the cutting tool, their materials and the cutting parameters, are the values of the cutting force and power. There is presented a comparison of values obtained by measuring during the process with those established by applying FEM. This study results lead to some remarks and useful recommendations for determining the process parameters and the requirements for the technological system in the machining of parts having thin walls, with minimum deformations.

 

Key words: thin wall milling, cutting conditions, force measuring, deformation and stress analysis.

 

Authors:

PhD, Eng, Ioan TĂNASE, Professor, University "Politehnica" of Bucharest, Machine and Production Systems Department, Bucharest, Romania.

E-mail: tanase.ioan@yahoo.com

Eng, Ionuţ GHIONEA, Lecturer, University "Politehnica" of Bucharest, Department of Machine Manufacturing Technology, Bucharest, Romania.

E-mail: ionut76@hotmail.com

 

pp. 231-234

 

NEW RELATION OF THE CUTTING FORCES FOR TURNING OF THE STAINLESS STEEL 13H11N2V2MFS
 

Aurelian VLASE, Maturin SIME, Constantin MINCIU

 View full text

 

 Abstract: Due to their exceptional characteristics of durability, hygienic, recyclable and low percent of toxicity characteristics, the stainless steels remain one of the most used groups of materials around the world. In order to ease the researches carried out and the decisions making process when selecting the optimum material within a technological process, it is crucial to understand the mathematical functions of cutting process during various operations. The paper presents a series of experimentally found data concerning the turning of the stainless steel 13H11N2V2MFS and the ways and means to determine the cutting forces with respect to the specific working conditions. The experimental data and their subsequent processing represent the contribution of the authors to the estimation of the polytropic exponents and to the assessment in terms of structure of the cutting forces equation. Afterwards, the paper presents the graphs for the variation of the cutting force components with the parameters of the cutting technology. The obtained results can be implemented in further research, in order to increase the productivity of steel machining.

 

Key words: cutting force, stainless steel, turning, polytropic exponents.

 

Authors:

PhD, Aurelian VLASE, Professor, University "Politehnica" of Bucharest, Chair of Production Engineering,

E-mail: avlase@yahoo.com

Eng, Maturin SIME, PhD Student, University "Politehnica" of Bucharest, Chair of Production Engineering, Products Manufacturing Technologies Laboratory,

E-mail: sopsime@yahoo.fr

PhD, Constantin MINCIU, Professor, University "Politehnica" of Bucharest, Machine and Production Systems Departmenat,

E-mail: minciu@imst.msp.pub.ro

 

6. ADVANCED MANUFACTURING TECHNOLOGIES

 

pp. 237-240

 

Analysis by simulation of the STATE OF Strains DURING the drawing process of parts made from metal sheets

 

Gheorghe BRABIE, Neculai NANU, Mioara RADU-COSTACHE

 View full text

 

Abstract: The stresses and strains generated in the stamped parts before and after the removing of the tools are the main cause that determines the springback of the draw parts made from metal sheets. Hence, to investigate the springback phenomenon it must be known the state of stresses and strains developed in the drawn part by the cold plastic forming. The experimental investigation of the stresses and strains distribution in the case of drawn parts is a difficult problem because of the forming tools construction and parts geometry complexity. An optimum solution to solve the problem can be the simulation of the forming process and stress/strain distribution. The present paper investigates the distribution of the strains by simulating the drawing process using ABAQUS software in the case of rectangular and cylindrical parts made from steel sheets.

 

Key words: deep drawing, state of strains, rectangular and cylindrical parts.

 

Authors:

PhD, Eng, Gheorghe BRABIE, Professor, University of Bacau, Industrial Engineering Department,

E-mail: g-brabie@ub.ro

Eng, Nanu Neculai, PhD Student, University of Bacau, CCIMT,

E-mail: nicu.nanu@ub.ro

Eng, Mioara Radu-Costache, PhD Student, University of Bacau, CCIMT,

E-mail: radu_mioara_elena@yahoo.com

 

pp. 241-244

 

OPTIMIZATION SYSTEM applied TO REDUCE OR ELIMINATE THE EFFECTS OF SPRINGBACK GENERATED BY SHEETS METAL DEEP DRAWING
 

Gheorghe BRABIE

 View full text

 

Abstract: The most frequent defects generated by cold plastic forming in parts made from metal sheets are caused by the following instability phenomena: springback and wrinkling. The present paper analyses the application of different methods and techniques in order to increase the accuracy of drawn parts made from metal sheets by reducing or eliminating the springback effects and it also proposes a system of drawing process design that will permit to reduce the springback effects  just from the designing stage.

 

Key words: Metal sheets drawing, springback, tool and process accuracy.

 

Author:

PhD, Eng, Gheorghe BRABIE, Professor, University of Bacau, Industrial Engineering Department,

E-mail: g-brabie@ub.ro

 

pp. 245-248

 

NEW APPROACH FOR WEB BASED PROCESS PLANNING
 

Saša ĆUKOVIĆ, Miladin STEFANOVIĆ, Goran DEVEDŽIĆ, Ionuţ GHIONEA

 View full text

 

Abstract: The basis for the survival on the world market include the increased integration of certain stages of development, planning and production of products, openness to potential partners, and distribution activities of all processes in real time. In today's collaborative work in many production and business organizations observed the trend of application specific infrastructure that provides global visibility of product data and automation of all relevant processes. Therefore, the basis for creating Web-based system for the process planning is an XML and STEP-NC representation of processes. Achieving these objectives in distributed production environment to a large extent can be accomplished by using the Internet and modern Web technologies.

 

Key words: web-based CAPP, XML, STEP-NC standards.

 

Authors:

Eng, Saša ĆUKOVIĆ, PhD student, Faculty of Mechanical Engineering Kragujevac, University of Kragujevac, Department of Production Engineering, Sestre Janjić 6, Kragujevac, Serbia,

E-mail: cukovic@kg.ac.rs

PhD, Miladin STEFANOVIĆ, Professor, Faculty of Mechanical Engineering Kragujevac, University of Kragujevac, Department of Production Engineering, Sestre Janjić 6, Kragujevac, Serbia,

E-mail: miladin@kg.ac.rs

PhD, Goran DEVEDŽIĆ, Professor, Faculty of Mechanical Engineering Kragujevac, University of Kragujevac, Department of Production Engineering, Sestre Janjić 6, Kragujevac, Serbia,

E-mail: devedzic@kg.ac.rs

Eng, Ionuţ GHIONEA, Lecturer, University "Politehnica" of Bucharest, Department of Machine Manufacturing Technology, Bucharest, Romania.

E-mail: ionut76@hotmail.com

 

pp. 249-252

 

PLAN OF THE APPLIED RESEARCH PROJECT TO DETECT RHEOLOGICAL PROPERTIES OF THERMOPLASTICS

 

Jozef DOBRÁNSKY, Janka MIHALČOVÁ, Jana KUĽBAGOVÁ

 View full text

 

Abstract:          This project deals with applying optimal number of regranulate from thermoplastics in products manufactured for automotive industry, which are made by injection moulding technology. It also pays attention to climate conditions effect on the quality of thermoplastic products produced by this method. To detect their quality will be used climatic chamber and machines used to control and test physico-mechanical and physico-chemical features of products. Project of Department of Technological Systems Operation of the Faculty of manufacturing Technologies of Technical University of Košice with a seat in Prešov focuses to support production practice, from ecological and economical aspect in co-operation with LPH Vranov n/T, Ltd. and JMP Plast, Ltd., which are several years working in manufacturing of plastic components.

 

Key words: rheological properties, thermoplastics, regranulate.

 

Authors:

PhD Eng, Jozef DOBRÁNSKY,., Department secretary, Assistant professor, Faculty of manufacturing technologies of the Technical University in Košice with a seat in Prešov, Department of Production Process Operation,

E-mail: jozef.dobransky@tuke.sk

PhD, RNDr, Janka MIHALČOVÁ,., Assistant Prof., Faculty of manufacturing technologies of the Technical University in Košice with a seat in Prešov, Department of Production Process Operation,

E-mail: jana.mihalcova@tuke.sk

Eng, Jana KUĽBAGOVÁ, Internal inceptor, Faculty of manufacturing technologies of the Technical University in Košice with a seat in Prešov, Department of Production Process Operation,

E-mail: jana.kulbagova@tuke.sk

 

pp. 253-256

 

ANALYSIS OF POLYCARBONATE RHEOLOGICAL PROPERTIES-

MELT VOLUME FLOW RATE (MVR)

 

Jozef DOBRÁNSKY, Janka MIHALČOVÁ, Imrich VOJTKO

 View full text

 

Abstract: Paper deals with verification of polycarbonate rheological properties. It was measuring and comparing rheological properties of polycarbonate plastic material produced by producer which are used for plastic parts production in automobile industry. This rheological property is very important for plastic parts production by injection moulding. Samples were removed in two different times from materials used for production and after that value of melt volume - flow rate were verified by HAAKE       Meltflixer equipment.

 

Key words: polycarbonate (PC), injection moulding, regranulate.

 

Authors:

PhD, MSc, Jozef DOBRÁNSKY, Lecturer, Technical Univ. in Košice, Faculty of Manufacturing Technologies in Prešov, Dept. of Production Processes Operation,

E-mail: jozef.dobransky@tuke.sk

PhD, RNDr, Janka MIHALČOVÁ, Lecturer, Technical Univ. in Košice, Faculty of Manufacturing Technologies in Prešov, Dept. of Production Processes Operation,

PhD, MSc, Imrich VOJTKO, Lecturer, Technical Univ. in Košice, Faculty of Manufacturing Technologies with a seat in Prešov, Dept. of Manufacturing Technologies

 

pp. 257-260

 

stainless steel Surface topograhy study in initial zone created by abrasive water jet
 

Sergej Hloch, Jan Valíček

 View full text

 

Abstract: The paper deals with detailed study topography of surfaces created by abrasive water jet in upper area of work piece known as initial zone that is neglected by many authors and researchers. Experimentally produced surfaces under various conditions defined by design of experiments have been analyzed by non-contact commercial profilometer MicroProf FRT. Irregularities of surfaces from stainless steel AISI 304 have been quantified by surface profile parameters Ra, Rq and Rz which have been obtained by Gwyddion software from 25 depth traces. The results have been statistically evaluated. It is a preliminary detailed study of neglected upper zones. Results obtained in the experimental part of the work, will serve as an important basis for further experimental research.

 

Key words: abrasive waterjet, initial zone, surface topography.

 

Authors:

PhD, Eng, Sergej HLOCH, Assoc. Professor, Technical University of Košice, Faculty of Manufacturing Technologies with a seat in Prešov, Department of Manufacturing Management,

E-mail: hloch.sergej@gmail.com

PhD, Eng, Jan Valíček, Assoc. Professor, VŠB –TU Ostrava, Faculty of mining and geology, Institute of Physics,

E-mail: jan.valicek@vsb.cz

 

pp. 261-264

 

SIMULATION AND STATISTIC METHODS – IMPORTANT TOOLS IN STUDYING

MILLING PROCESS OF A COMPOSITE MATERIAL

 

Mihaiela ILIESCU, Paulina SPÂNU

 View full text

 

 

Abstract: Simulation and statistics represent important tools to be used in research and study of any machining process. Polymeric composite materials are widely used and subject to continuous improvement due to their special characteristics. The milling of parts made of these materials represents a widely used machining procedure. The research on the reciprocal influence of the involved process parameters can be efficiently done if modern simulation and statistic methods are involved.

 

Key words: simulation, statistics, regression, milling, surface roughness.

 

Authors:

PhD, Eng, Mihaiela ILIESCU, Assoc. Professor, University "Politehnica" of Bucharest, Manufacturing Department,

E-mail: iomi@clicknet.ro

PhD, Eng, Paulina SPÂNU, Lecturer, University "Politehnica" of Bucharest, Manufacturing Department,

E-mail: pauspa16@yahoo.com

 

pp. 265-270

 

RESEARCH REGARDING THE IMPACT BEHAVIOR OF SANDWICH STRUCTURE WITH ORGANIC FIBROCEMENT
 

Adrian MARINESCU, Diana MURAR, Constantin OPRAN,

Cătălina BIVOLARU, Victor PĂNUŞ

 View full text

 

Abstract: Research on the design and manufacture of new materials, for different products, aim to produce them at a price as low cost, quality and higher reliability. Using new materials is  a priority for both manufacturers and users. Depending on the characteristics of materials, they have a wide use in various areas such as: machine building, aviation, aeronautics, construction and civil engineering, etc. The objective of this paper is to analysis the impact behavior of sandwich structures with organic fibrocement  for building industry.

 

Key words: sandwich structure, organic fibrocement, impact.

 

Authors:

PhD, Eng, Adrian MARINESCU, Assoc. Professor, University "Politehnica"of Bucharest, Department of Machine Manufacturing Technology,

E-mail: madriandan@yahoo.com

Eng, Diana MURAR, PhD Student, University "Politehnica"of Bucharest, Department of Machine Manufacturing Technology,

E-mail: murar.diana@ltpc.pub.ro

PhD, Eng, Constantin OPRAN, Professor, University "Politehnica"of Bucharest, Department of Machine Manufacturing Technology,

E-mail: constantin.opran@ltpc.pub.ro

Eng, Cătălina BIVOLARU, PhD Student, University "Politehnica"of Bucharest, Department of Machine Manufacturing Technology,

E-mail: catalina.bivolaru@ltpc.pub.ro

Assoc. Prof. Victor PĂNUŞ, University "Politehnica"of Bucharest, Department of Machine Manufacturing Technology,

E-mail: victor.panus@ltpc.pub.ro

 

pp. 271-274

 

The impact of selected parameters on the quality of the ceramic granulate and its use in engineering
 

Imrich ORLOVSKÝ

 View full text

 

Abstract: The paper deals with technology of production of ceramic granulate, that is further used for production of ceramic products. Drying is wide-spread technological process used in almost every industrial sphere. One of them is ceramic industry. The moisture of the granulate belongs to main parameters influencing its quality.

Key words: ceramics, granulate, combustion, moisture, temperature.

Author:

PhD, Eng, Imrich ORLOVSKÝ, Faculty of Manufacturing Technologies of Technical University in Košce with a seat in Prešov, Department of Production Technologies,

E-mail: imrich.orlovsky@tuke.sk

 

pp. 275-278

 

Mathematical model of the spray dry
 

Imrich ORLOVSKÝ, Jozef ZAJAC

 View full text

 

Abstract: The article describes the activities of spray dry, for which was designed a mathematical model of the drying. This model allows to identify and define the process throughout  drying. The output of this model is the equation of balance.

 

Key words: spray dry, mathematical model, combustion, humidity, granulate.

 

Authors:

PhD, Eng,. Imrich ORLOVSKÝ,. Faculty of Manufacturing Technologies of Technical University in Košce with a seat in Prešov, Department of Production Technologies,

E-mail: imrich.orlovsky@tuke.sk

PhD, Eng, Jozef ZAJAC, Professor, CSc, Faculty of Manufacturing Technologies of Technical University in Košce with a seat in Prešov, Department of Production Technologies,

E-mail: jozef.zajac@tuke.sk

 

pp. 279-282

 

MATHEMATICAL MODELLING WITH LAMB’S WAVES

OF THE ULTRASONIC NON-DESTRUCTIVE CONTROL

FOR THE MULTI-LAYER COMPOSITE MATERIALS

 

Constantin PETRICEANU, Cătălin Gheorghe AMZA

 View full text

 

Abstract: This paper presents theoretical and experimental aspects related to the establishment of integrity status of the multi-layer composite materials. In order to do this ultrasounds will be used with relatively low frequency (100-500 kHz) in the shape of layer’s waves (Lamb’s waves). First, theoretical model of propagation of the Lamb’s waves in a mono-layer isotropic material plaque situated in a fluid, and generalizing by using the Debye’s series developing formalism it will determine the conception of a mathematical model adequate to the proposed purpose. The results obtained in such way were compared to those obtained through experiments, having as consequence that the mathematical model corresponds to the physical reality and can be successfully used in the determination of mechanical properties or of the integrity state’s of a heterogeneous composite material.

 

Key words: ultrasounds, composites, Lamb’s ways, acoustic field, Deby’s series,  non-destructive control.

 

Authors:

Eng, Constantin PETRICEANU, Assistant Prof., University "Politehnica" of Bucharest, Materials Technology Department,

E-mail: c_petriceanu@rectorat.pub.ro

Eng, Cătălin Gheorghe AMZA, Assoc. Professor, University "Politehnica" of Bucharest, Materials Technology Department,

E-mail: acata1@amza.camis.pub.ro

 

pp. 283-286

 

CONSIDERATIONS REGARDING THE MONITORING AND DIAGNOSTIC OF MANUFACTURING SYSTEMS FOR PREVENTIVE MAINTENANCE

 

Ilie Octavian POPP, Ioan BÂRSAN

 View full text

 

Abstract: Continuous monitoring of the processes in the operating machinery has always been considered as one of the most efficient methods for machine condition assessment. Recently, a major step forward in the development of microprocessor and signal analysis technology has occurred that allows the development of powerful, efficient, and, at the same time relatively in-expensive systems for continuous condition monitoring of different machine parameters. These systems have become widely used in many enterprises and now, the market-place shows continuously growing demand for such systems.

 

Key words: vibration monitoring system, diagnostic, equipments, maintenance.

 

Authors:

PhD, Eng, Ilie Octavian POPP, Assoc. Professor, "Lucian Blaga" University of Sibiu, Faculty of Engineering "Hermann Oberth", Department of Machines and Machinery,

E-mail: ilie.popp@ulbsibiu.ro

PhD, Eng, Ioan BĂRSAN, Professor, "Lucian Blaga" University of Sibiu, Faculty of Engineering "Hermann Oberth", Department of Machines and Machinery,

E-mail:ioan.barsan@ulbsibiu.ro

 

pp. 287-290

 

MULTIPLE STUCK-AT FAULTS AND VLSI DIAGNOSTIC TEST VECTOR GENERATION

 

Pavlinka RADOYSKA, Kamen FILLYOV

 View full text

 

Abstract: One of the most common heavy problems in fault detection and fault diagnosis is the fault masking. Multiple stuck-at fault analysis is an approach for solving the problem, but the full multiple fault combination analysis is a time consuming procedure. Selecting only the dependent faults reduces the time for analysis and test pattern generation.  We suggest a method for test pattern generation with multiple fault simulations to overcome masking fault problem. The method consists of two algorithms: (1) finding the pairs for multiple fault simulation; (2) generating the test patterns, which can avoid potential masking effect.

 

Key words: digital circuits, multiple fault simulation, fault masking, diagnosis, test pattern generation.

 

Authors:

Pavlinka RADOYSKA, Assistant Prof., TU-Sofia, KEE,

E-mail: pradoiska@abv.bg

PhD, Kamen FILLYOV, Professor, TU-Sofia, FCSU

E-mail: kfillyov@ecad.tu-sofia

 

pp. 291-294

 

MACHINABILITY BY ELECTRICAL DISCHARGE MACHINING OF SOME MATERIALS FOR CUTTING TOOLS
 

Laurenţiu SLĂTINEANU, Margareta COTEAŢĂ, Oana DODUN

 View full text

 

Abstract: The necessity to ensure greater service lives for the cutting tools led to the using of materials characterized by a diminished machinability by classical machining methods. In such conditions, one of the machining methods able to allow the efficient obtaining of the cutting tools active surfaces was the electrical discharge machining. Usually, the cutting tools materials include elements with high melting and vaporizing temperatures and this fact could negatively affect their machinability by electrical discharge machining. To evaluate the machinability by electrical discharge machining of the electroconductive materials, a device which use a single electrical discharge was designed and built. The experimental researches aiming the evaluation of the machinability of some cutting tool materials by electrical discharge machining proved their reduced size of the machinability index based on the quantity of material removed by a single electrical discharge.

 

Key words: electrical discharge machining, machinability, cutting tools materials, single electrical discharge  experimental research, empirical models.

 

Authors:

PhD., Eng, Laurenţiu SLĂTINEANU, Professor, Technical University "Gheorghe Asachi" of Iaşi, Department of Machine Manufacturing Technology,

E-mail: slati@tcm.tuiasi.ro

Eng., Margareta COTEAŢĂ, Assistant Prof., Technical University "Gheorghe Asachi" of Iaşi, Department of Machine Manufacturing Technology,

E-mail: mcoteata@tcm.tuiasi.ro

PhD., Oana DODUN, Assoc. Professor, Technical University "Gheorghe Asachi" of Iaşi, Department of Machine Manufacturing Technology,

E-mail: oanad@tcm.tuiasi.ro

 

pp. 295-300

 

DEVELOPMENT OF THE STANDARD PROCESS PLANS

FOR ROLLING BEARINGS MANUFACTURING
 

Velimir TODIĆ, Dejan LUKIĆ, Mijodrag MILOŠEVIĆ, Stevo BOROJEVIĆ

 View full text

 

Abstract: Demands of modern market are oriented towards quick production program change, shortening of delivery intervals, quality raising and lowering of the product price. Satisfaction of market requirements demands improve all functions inside the production system, especially the product preparation. This paper introduces basic analysis of the process plans for rolling bearings production from FKL Company and information about development standard process plans for manufacturing of ball, cylindrical roller, spherical roller and needle roller bearings from this manufacturing systems. Standard process plans for rolling bearing manufacturing are fundament of organization of manufacturing of these products.

 

Key words: rolling bearings, standard process plans, analysis, development.

 

Authors:

PhD, Velimir TODIĆ, Professor, Head of Chair of Computer Supported Technological Systems and Design Processes,

University of Novi Sad, Faculty of Technical Science, Department of Production Engineering, Trg Dositeja Obradovica 6, 21000 Novi Sad, Republic of Serbia,

Tel.: +381 21 485-2346, Fax: +381 21 454-495.

E-mail:   todvel@uns.ns.ac.yu

M.Sc, Dejan LUKIĆ, Assistant, Mechanical Engineering,

University of Novi Sad, Faculty of Technical Science, Department of Production Engineering, Trg Dositeja Obradovica 6, 21000 Novi Sad, Republic of Serbia,

E-mail:   lukicd@uns.ns.ac.yu

M.Sc, Mijodrag MILOŠEVIĆ, Assistant, Mechanical Engineering, University of Novi Sad, Faculty of Technical Science, Department of Production Engineering, Trg Dositeja Obradovica 6, 21000 Novi Sad, Republic of Serbia,

E-mail:   mido@uns.ns.ac.yu

BS. Stevo BOROJEVIĆ, Mechanical Engineering, University of Banjaluka, Faculty of Mechanical Engineering Banjaluka, Stepe Stepanovica 75, 78000 Banjaluka, Bosnia and Herzegovina, Tel.: +387 51 462 400

E-mail: stevoborojevic@hotmail.com

 

pp. 301-304

 

ADVANCED PROCESSING of the X60-X80 HEAVY PLATES FOR

PIPELINES APPLICATIONS

 

Elisabeta VASILESCU, Ioan Vasilescu, Viorel Ovidiu RÎndaŞu, Marian NEACŞU

 View full text

 

Abstract: This paper presents only some partial results obtained when applying different regimes of thermo mechanical treatment on weldable steel thick plates of different thicknesses and qualities within experimental researches made at laboratory and industrial scale. The experiments have been made on the equipment of the Plastic Deformation and Thermal Treatments Laboratory from Faculty of Metallurgy and Materials Science using X60, X70, X80 steel – grade test specimen made at Mittal Steel Galati. The results of the laboratory experiments illustrated the importance of the technological parameters: the end deformation temperature, the deformation degree and post deformation maintaining time on the structure and mechanical characteristics. These results are confirmed at large scale by experimental researches in Mittal Steel conditions.

           

Key words: microalloyed steel, heavy plates, thermomechanical treatment, rolling, accelerated cooling.

 

Authors:

PhD, Elisabeta VASILESCU, Professor, "Dunarea de Jos" University of Galati, Metalurgy and Materials Science Department, Galati, Romania,

E-mail: elisabeta.vasilescu@yahoo.com

Eng. Ioan Vasilescu, Arcelor-Mittal Steel Galati, Romania,

E-mail: ioan.vasilescu@yahoo.com

PhD, Viorel Ovidiu RÎndaŞu, Assoc. Professor, University "Politehnica" of Bucharest, Machine and Manufacturing Systems Department, Bucharest, Romania

E-mail: viorel.rindasu@gmail.com

Assist. Marian NEACŞU, Dunarea de Jos University of Galati, Metalurgy and Materials Science  Department, Galati, Romania

E-mail: uscaeni@yahoo.com

 

7. APPROACH ON CAD, CAM, CAE TECHNIQUES

 

pp. 307-310

 

RAPID PROTOTYPING AND THE ECONOMIC CRISIS
 

Carmen Gabriela BĂCILĂ, Zoltan-Gabor BAKI-HARI

 View full text

 

Abstract: More than two decades ago nobody would have thought that the recently appeared Rapid Prototyping Technologies will become the producers’ instrument of fighting against the effects of the global economic crisis. This is possible because these technologies offer a series of technical and economical advantages to the users, such as the concomitant reduction of the type and of the cost of products development. They also knew a very spectacular development, both in performances and in the area of usage. This development is anticipated to continue in the future, in spite of the recession. But we have to remind here that if we want this things to happen, like in the past, there must be granted funds for researches and development.

 

Key words: rapid prototyping, economic crisis, product development, concurrent engineering, CAD/CAE/CAM

 

Authors:

Eng, Carmen Gabriela BĂCILĂ, PhD Student, Technical University of Cluj-Napoca, Management and Systems Engineering Department,

E-mail: gabriela_bacila@yahoo.com

Eng, Zoltan-Gabor BAKI-HARI, PhD Student, Transylvanian Museum Society, Technical Section, Cluj-Napoca,

E-mail: bakihari@yahoo.com

 

pp. 311-314

 

COMPUTER AIDED PRODUCTION ENGINEERING
 

Jozef NOVAK-MARCINCIN, Marcela KUZMIAKOVA

 View full text

 

Abstract: Prevalent area of exploitation of CAM (Computer Aided Manufacturing) systems is computer aided program creating for NC production equipment. However, CAM systems do not sufficiently cover all periods of production process and due to this, the necessity to define the systems of Computer Aided Production Engineering - CAPE is obvious. CAPE is a subsystem of the system CIM including the computer aided systems of all activities connected with realization of product manufacturing.

 

Key words: CA systems, CA technology, computer aided manufacturing, CAPE systems.

 

Authors:

PhD, Eng, Jozef NOVAK-MARCINCIN, Professor, Technical University of Kosice, Faculty of Manufacturing Technologies in Presov, Slovak Republic,

E-mail: jozef.marcincin@tuke.sk

Eng, Marcela KUZMIAKOVA, Technical University of Kosice, Faculty of Manufacturing Technologies in Presov, Slovak Republic

 

pp. 315-318

 

NEW MACROS TO ENABLE WORKING IN A COLLABORATIVE WAY WITH CATIA V5 AND ENOVIA
 

Aurel MITRACHE, Constantin ISPAS, Miron ZAPCIU, Sorin ŞTEFAN

 View full text

 

Abstract: To grow and stay competitive, companies in all industries must reduce time-to-market, improve product quality and lower the development costs. Traditionally, companies have managed product development in departmental silos, which has contributed to longer product lifecycles, delayed product launches and eventually loss of market share. In this work-paper a new feature based on two macros will be presented. The feature helps to saving the positioning of assembly components without saving in Catia V5 previously. These two macros programs were developed being necessary in the practical cases, when CAD applications use in a collaborative way the software Catia V5 and Enovia VPM.

 

Key words: Catia V5, Enovia VPM, ensemble, macro.

 

Authors:

Eng, Aurel MITRACHE, PhD Student, University "Politehnica" of Bucharest, Machine and Productions Systems Department,

E-mail: mitracheaurel@yahoo.com

PhD, DHcc, Constantin ISPAS, Professor, University "Politehnica" of Bucharest, Machine and Productions Systems Department,

E-mail: ispas1002000@yahoo.fr

PhD, Miron ZAPCIU, Professor, University "Politehnica" of Bucharest, Machine and Productions Systems Department,

E-mail: zapcium@sun.cfic.pub.ro

Eng, Sorin ŞTEFAN, U PhD Student, University "Politehnica" of Bucharest, Machine and Productions Systems Department,

E-mail: sorinstefan@yahoo.com

 

pp. 319-322

 

POSSIBILITIES OF COMPETITIVENESS INCREASING OF EUROPEAN COMPANIES VIA DATA UNIFICATION AT PROCESS PLANNING

 

Peter Monka, Katarína Monková

 View full text

 

Abstract: The article deals with the possibilities and advantages that offer the method of multi-variant process plan creation. This method is supported by database application working with mathematical tools. The preparing of processes, technological and manufacturing documentation by this way can be very advantageously for making good decisions in short periods and enable to be more flexible for manufacturing units by using of them.The results presented in the article are used in authors workplace conditions and they originate with the direct supporting of Ministry of Education VEGA registration number 1/0558/08.

 

Key words:       template data unification, computer aided process planning - CAPP, production information system.

 

Authors:

PhD, Eng, Peter MONKA, Assoc. Professor, Vice Head of Department, Technical University in Kosice, Faculty of Manufacturing Technologies with seat in Presov, Department of Manufacturing Technologies,

E-mail: peter.monka@tuke.sk

PhD, Eng, Katarina Monková, Assoc. Professor, Prelector, Technical University in Kosice, Faculty of Manufacturing Technologies with seat in Presov, Department of Technological Devices Design,

E-mail: monkova.katarina@apeiron.eu

 

pp. 323-326

 

The production efficiency increasing of the template for rotor winding

 

Katarina MonkovA, Peter Monka

 View full text

 

Abstract: The contribution deals with the suggestion of new production mode of the template for rotor winding. The handmade part with variable radius fillet is concerned.  To obtain the dimensions of such real part with undefined radius fillet is often very difficult, especially, if the accuracy requirement is great. The solution of this problem can greatly affect the efficiency of the part manufacturing and so considerably decrease the economic cost for its manufacturing.

 

Key words: unknown radius fillet, reverse engineering, digitizing, CAD/CAM system, CNC machining.

 

Authors:

PhD, Eng, Katarina MONKOVA, Assoc. Professor, Prelector, Technical University in Kosice, Faculty of Manufacturing Technologies with seat in Presov, Department of Technological Devices Design,

E-mail: monkova.katarina@apeiron.eu

PhD, Eng, Peter MONKA, Assoc. Professor, Vice Head of Department, Technical University in Kosice, Faculty of Manufacturing Technologies with seat in Presov, Department of Manufacturing Technologies,

E-mail: peter.monka@tuke.sk

 

pp. 327-330

 

STRUCTURE ANALYSIS OF MOULD PARTS MADE OF MATERIALS FOR SOFT MOULDS
 

Jaromír MURČINKO, Zuzana MURČINKOVÁ, Mário ŠTIAVNICKÝ

 View full text

 

Abstract: The paper deals with structure analysis of mould parts made of materials for so called soft moulds. Soft mould is mould intended for small-lot and piece production. The gap in division plane causes increasing of loading space resulted in product without required dimensions (accuracy). The designing stage of mould is important to find final deformation of mould parts from applied load. The paper analyzes the three chosen materials suitable for soft moulds.

 

Key words: mould, gap, division plane, accuracy, material, deformation.

 

Authors:

PhD, Eng, Jaromír MURČINKO, Researcher, Faculty of Manufacturing Technologies in Prešov, Technical University Košice, Department of Manufacturing Technologies,

E-mail: jaromir.murcinko@tuke.sk

PhD, Eng, Zuzana MURČINKOVÁ, Lecturer, Faculty of Manufacturing Technologies in Prešov, Technical university Košice, Department of Technological Devices Design,

E-mail: zuzana.murcinkova@tuke.sk

PhD, Eng, Mário ŠTIAVNICKÝ, Lecturer, Academy of Armed Forces of General M. R. Štefánik, Department of Mechanical Engineering,

E-mail: stiavnicky@aoslm.sk

 

pp. 331-334

 

THEORETICAL CONSIDERATIONS REGARDING THE FINITE ELEMENTS ANALYSIS OF A MODULAR SYSTEM FOR MILLING PROCESSING

 

Raluca Magdalena NIŢĂ, Nicoleta RACHIERU

 View full text

 

Abstract:  The paper deals with the study using the finite elements method of the behavior under the action of clamping and process forces of a modular system used for clamping the pieces during the cutting process. The performance, reliability, and durability of the system functioning represent the fundamental characteristics having a  great influence on the final results of processing.

 

Key words: modular system, structural analysis, FEM analysis, CAD, milling.

 

Author:

Eng, Raluca Magdalena NIŢĂ, Ph. Student, University "Politehnica" of Bucharest, Machine and Production Systems Department.

E-mail: ralu_magda@yahoo.com

PhD, Eng,  Econ, Nicoleta RACHIERU, S.C. ALPLAST CONF S.R.L., Romania,

E-mail: nrachieru@yahoo.com

 

pp. 335-338

 

Computer aided selection in design processes

with multivariate statistics
 

Adrian PARIS, Constantin TÂRCOLEA

 View full text

 

Abstract: : Principal Component Analysis (known briefly as PCA) is a multivariate statistical technique for simplifying a cloud data set [1, 2]. Based on this procedure the observable possibly correlated properties are reported into a few uncorrelated “attributes”; in other words it is considered a transformation from a space into a subspace such that the retained variance of the original cloud is “maximal” by this new representation [3, 4]. In a previous paper [7] we applied the so called the Jöreskog' technique used for the dimensional reduction in a bivariate subspace. The goal of this paper is to apply the Pearson method of PCA, for the same family of materials, using the XLSTAT 2009 software; new relevant factors are obtained, and the results are comparable.

 

Key words: principal component analysis, materials selection, artificial factors, design of experiments.

 

Authors:

PhD, Math., Constantin TÂRCOLEA, Professor, University "Politehnica" of Bucharest, Department of Mathematics,

E-mail: constantin_tarcolea@yahoo.com

PhD, Eng, Adrian PARIS, Lecturer, University "Politehnica" of Bucharest, Materials Tehnology and Welding Department,

E-mail: adrianparis@amza.camis.pub.ro

 

pp. 339-342

 

REVERSE ENGINEERING AND RAPID PROTOTYPING INTEGRATION
 

Diana POPESCU, Cristina PUPĂZĂ, Robert IACOB, Marian IVANOV

 View full text

 

Abstract: The integration of reverse engineering, 3D CAD modeling and rapid prototyping technologies is used more and more by companies in the world, in order to cut the time-to-market and costs for new products and thus to gain competitive advantages over the competition. The present article is setting the general approach for this type of integration and describes the main steps of a product development cycle based on this integration. The range of applications is very large and can cover not only the engineering field, but also the medical one, by improving the design and functionality of prostheses, implants or surgical tools or even architecture and arts.

 

Key words: reverse engineering, rapid prototyping, CAD modeling, integration.

 

Authors:

PhD, Eng, Diana POPESCU, Lecturer, University "Politehnica" of Bucharest, Machines and Production Systems Department,

E-mail: diana@mix.mmi.pub.ro

PhD, Eng,. Cristina PUPĂZĂ, Assoc. Professor, University "Politehnica" of Bucharest, Machines and Production Systems Department,

E-mail: cristinapupaza@yahoo.co.uk

Eng, Robert IACOB, PhD student, University "Politehnica" of Bucharest, Machines and Production Systems Department,

E-mail: robert.iacob@gmail.com

Eng, Marian IVANOV, Autosoft Service Roti Bucharest, E-mail: ivanovmarian2004@gmail.com

 

pp. 343-346

 

3-D Research on Fork Arms of Forklift Trucks

 

Yanko SLAVCHEV

 View full text

 

Abstract: This article presents a research, conducted by 3-D computer models and the finite element method (FEM), on the stressed state of fork arms of forklifts. Several modes of attachment to the carrying plate have been taken into consideration. Special interest has been paid to the stressed state of the folded region and the console welds for arms attachment. A multi-objective optimization, specifically a goal driven optimization (GDO), is performed to estimate the length of the fork arm when it is loaded by a payload, placed on a wooden pallet.

 

Keywords: 3D computer model, FEM, curved beam, fork, optimization, wooden pallet.

 

Author:

PhD, MEng, Yanko SLAVCHEV, Assistant Engineer; Technical University of Sofia, Faculty of Mechanical Engineering, Engineering Logistics, Materials Handling and Building Machines,

E-mail: ya_slavchev@abv.bg

 

pp. 347-352

 

Safety and reliability assesment of forkilft truck CABINE based on virtual prototype
 

Georgi TODOROV, Konstantin KAMBEROV, Borislav ROMANOV, Tsvetozar IVANOV

 View full text

 

Abstract: Virtual prototype model is used for safety and reliability assessment of a forklift truck cabin at the design stage. Numerical techniques are used to reproduce test conditions described in standard ISO 6055:2004 (E) and to find competitive solution based on cost and design properties criteria. Used approach accuracy is approved by physical tests carried out by certification organization. Application of virtual techniques at earliest possible product life cycle stage results in decreased costs for product implementation and decreased time-to-market.

 

Key words: reliability, virtual prototype, forklift, CAD, CAE.

 

Authors:

PhD, Georgi TODOROV, Proffessor , Technical University - Sofia, Faculty of Machine Technology,

E-mail: gdt@tu-sofia.bg

MSc, Konstantin KAMBEROV, Research Eng, Technical University - Sofia, Faculty of Machine Technology,

E-mail: kkamberov@3clab.com

MSc, Borislav ROMANOV, Research Eng, Technical University - Sofia, Faculty of Machine Technology, E-mail: bromanov@tu-sofia.bg

MSc, Tsvetozar IVANOV, Research Engineer, Technical University - Sofia, Faculty of Machine Technology,

E-mail: tsivanov@3clab.com

 

8. INDUSTRIAL MARKETING AND MANAGEMENT

 

pp. 355-358

 

ESTABLISHING THE APPLICATIVE DEVELOPMENT NECESSARY

ELEMENTS FOR TECHNOLOGICAL TRANSFER

 

Nicoleta Luminiţa CĂRUŢAŞU, Florina ANGHEL

 View full text

 

Abstract: In this paper, we use the inquiry not simply focusing on the techniques, procedures and tools to collect information (as for the survey) but, for a better understanding, the inquiry methods are combined with other research techniques, such as the scientific observation or the documentary and content analysis. Establishing by inquiry the applicative development necessary elements for technological transfer it represents a scientific method of investigation, by avoiding as much as possible errors that may occur, some due to the faulty procedures and others due to the respondents’ lack of cooperation.

 

Key words: transfer, applicative development, mining activities, inquiry, European area of research, technology.

 

Authors:

PhD, Eng, Nicoleta Luminiţa CARUŢAŞU, Lecturer, University "Politehnica" of Bucharest, Machine and Production Systems Department,

E-mail: nicoletacarutasu@yahoo.com

Eng, Florina ANGHEL, PhD Student, University "Politehnica" of Bucharest, Machine and Production Systems Department,

E-mail: anghel_florina@yahoo.co.uk

 

pp. 359-362

 

TECHNOLOGICAL TRANSFER POSSIBILITIES FOR THE INTEGRATION

OF ROMANIAN RESEARCH IN EUROPEAN AREA
 

Nicoleta Luminiţa CARUŢAŞU, Lidia Florentina PARPALĂ

 View full text

 

Abstract: The inquiry main characteristic is that people provide the information, thus severely limiting its use (eg: aspects relating to the people providing the information). The inquiry elaboration involves a rigorous methodology, in order to compensate the lack of control (manipulation) over the variables. In this paper, an inquiry was elaborated for the project “The convergence of the valorisation technologies for the useful mineral substances in effluents, in order to integrate the Romanian research in the integration European area”, contract No. 248, financed within the Excellence Research Program, Module III, where research teams from CTTIE - Bucharest, ICPE S.A., UPB - CASM and AMCSIT – "Politehnica" are involved. This inquiry is designed for universities, research institutes, enterprises and more.

 

Key words: inquiry, European research area, enterprises, research institutes, universities.

 

Authors:

PhD, Eng, Nicoleta Luminiţa CARUŢAŞU, Lecturer, University "Politehnica" of Bucharest, Machine and Production Systems Department,

E-mail: nicoletacarutasu@yahoo.com

PhD, Eng, Lidia Florentina PARPALĂ, Assistant Prof. University "Politehnica" of Bucharest, Machine and Production Systems Department,

E-mail: Lidia.Parpala@gmail.com

 

pp. 363-366

 

ON PRODUCT LIFE CYCLE CONCEPTS

 

George DOBRE, Radu Florin MIRICĂ, Marin NEACŞA

 View full text

 

Abstract: The paper approaches a very interesting aspect for academic, engineering and even social field: the meanings of the concepts of product life cycle. There are two denominations including the syntagma “life cycle” used with different senses in literature: product life cycle and product life cycle management that will be presented. The product life cycle seen from different points of view is also discussed: on the one hand, from the point of view of turnover and profit; on the other hand, from the point of view of the field of application. Schemes and considerations about these concepts and meanings are given. Own proposal of a product life cycle scheme in (mechanical) engineering is largely analyzed. Final conclusions comment the paper results.

 

Key words:       designer, product life cycle, product life cycle management, product development, mechanical engineering, turnover, profit.

 

Authors:

PhD, Eng, George DOBRE, Professor, University "Politehnica" of Bucharest, Chair of Mechanisms and Robots Theory,

E-mail: G.Dobre@rdslink.ro

PhD, Eng, Radu Florin MIRICĂ, Assoc. Professor, University "Politehnica" of Bucharest, Chair of Mechanisms and Robots Theory,

E-mail: mirica@omtr.pub.ro

PhD, Eng, Marin NEACŞA, Assoc. Professor, University "Politehnica" of Bucharest, Chair of Mechanisms and Robots Theory,

E-mail: neacsam@gmail.com

 

pp. 367-370

 

COLLABORATIVE DESIGN SYSTEMS FOR VIRTUAL PRODUCT DEVELOPMENT IN THE PREMINV PLATFORM
 

George DrĂgoi, Costel Emil COTEŢ, Luminiţa ROŞU, Alexandru RADOVICI

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Abstract: Development teams involved in the product development are often geographically and temporally distributed. There is a high level of outsourcing in the actual product development efforts .It is then possible to say that enterprises give rise to a special type of virtual enterprise (VE), in which each company maintains the greatest flexibility and business independence. This paper gives an overview of the new Web Services technology based of the software solutions, discusses the critical issues of the virtual product development, presents the roles of the virtual teams, and build a general architecture of an experimental platform for training, research and consulting in the new digital economy, located in the PREMINV center at the University "Politehnica" of Bucharest.

 

Key words: collaborative design system, virtual enterprises, virtual teams, Internet/Intranet/Extranet-based systems, outsourcing.

 

Authors:

PhD, George DRĂGOI, Professor, University "Politehnica" of Bucharest, Faculty of Engineering in Foreign Languages, PREMINV Research Centre,

E-mail: gdragoi@mix.mmi.pub.ro

Phd, Costel Emil COTEŢ, Asoc. Professor, University "Politehnica" of Bucharest, Machine and Production Systems Department, PREMINV Research Centre,

E-mail: costel@mix.mmi.pub.ro

Msc, Eng, Luminiţa ROŞU, S.C. Proiect S.A., Buzăau, PREMINV Research Centre,

E-mail: luminitarosu@yahoo.com

Eng, Alexandru RADOVICI, Assistant Prof., PhD. Student, University "Politehnica" of Bucharest, Faculty of Engineering in Foreign Languages, PREMINV Research Centre,

E-mail: msg4alex@gmail.com

 

pp. 371-374

 

KNOWLEDGE-BASED ECONOMY MAIN REQUIREMENTS REGARDING THE DEFINITIONS AND THE MEASUREMENTS FOR INNOVATION AS A SYSTEM

 

Marius GURAN, Costel Emil COTEŢ, Cicerone Laurenţiu POPA

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Abstract: Because in the knowledge-based economy, innovation is playing a central role we consider necessary to better understand the complex processes of innovation at the macro-level, as dominant factors in national economy growth, and at the micro-level, within firm, as enchanting the firm’s capacity to absorb and make use of new technology of all kinds. In this paper focusing on some main economical aspects of innovation, are presented the conceptual framework of innovation as systemic view, chain-link model as a way in which innovation is generated within the firm, and some proposals about the need to develop a new generation of indicators that can measure the innovation performance as well as other related outputs of knowledge-based economy.

 

Key words: innovation, knowledge-based economy, innovation system, innovation model.

 

Authors:

PhD, Eng, Guran MARIUS, Professor, University "Politehnica" of Bucharest, Machines and Manufacturing Systems Department, Romania,

E-mail: mguran@mix.mmi.pub.ro

PhD, Eng, Costel Emil COTEŢ, Associate Professor, University "Politehnica" of Bucharest, Machine and Manufacturing Systems Department, Romania,

E-mail: costel@mix.mmi.pub.ro

PhD, Eng, Cicerone Laurenţiu POPA, Lecturer, University "Politehnica" of Bucharest, Machine and Manufacturing Systems Department, Romania,

E-mail: laur.popa79@gmail.com

 

pp. 375-378

 

RESEARCH IN LIFELONG LEARNING PROJECT IRMA ORIENTED

TO MANUFACTURING AREA  
 

Jozef NOVAK-MARCINCIN, Claudio ROSSO

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Abstract: The Project Inter-countries Research for Manufacturing Advancement (IRMA project) consists of the realization of a Research/Comparative Analysis in the 27 European Union’s Member States, aimed at promotion of excellence, efficiency and fairness of the instruction in Higher Education Institutes. The IRMA project focuses on the Manufacturing Engineering filed, taken into consideration its high level of innovation and fast changes in requirements that students must possess, in order to be adapt and competitive on the labour market. The objectives of the IRMA project is to innovate and to improve educational systems of technical universities at European level, in order to offer to students a competitive environment based on innovative teaching methods, instruments and contents, that allows their intellectual increase and be able to satisfy new necessities and requests, emerged from the market labour.

 

Key words: manufacturing engineering, lifelong learning programme, research in manufacturing.

 

Authors:

PhD, Eng, Jozef NOVAK-MARCINCIN, Professor, Technical University of Kosice, Faculty of Manufacturing Technologies in Presov, Slovak Republic,

E-mail: jozef.marcincin@tuke.sk

PhD, Claudio ROSSO, Gruppo CS, Via Leini 23, 10036 Settimo Torinese (Turin), Italy,

E-mail: rosso@gruppocs.com

 

pp. 379-382

 

KNOWLEDGE BASES DEVELOPMENT AT THE SMEs LEVEL IN THE NEW KNOWLEDGE SOCIETY
 

Sebastian Marius ROŞU, Vidosav D. MAJSTOROVIĆ, George DRĂGOI

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Abstract: In the European countries more then 95% of the companies are small and medium-sized enterprises (SMEs) and majority of the European Union employees work in these companies. In order to develop intelligent business to become competitive, the enterprises must increase the quality and technologic level of products and services, to have permanent new product or to make old products bettering and to have a good prices policy. These activities request first a large amount of data, information and knowledge collected from all sources and then request transferring knowledge at each enterprise level. This paper analyses the state of art of the SMEs knowledge and presents how can be knowledge bases built and used at the SMEs level to support an enterprise department activity.

 

Key words: knowledge, knowledge bases, knowledge processes, knowledge society, SME.

 

Authors:

PhD, Sebastian Marius ROŞU, Special Telecommunications Service, IT Department, Bucharest, Romania,

E-mail: sebastianrosu@stsnet.ro

PhD, Vidosav D. MAJSTOROVIC, Professor, University of Belgrade, Mechanical Engineering Faculty, Laboratory for Production Metrology and TQM, Belgrade, Serbia,

E-mail: majnem@eunet.yu

PhD, George DRĂGOI, Professor, University "Politehnica" of Bucharest, FILS, PREMINV Research Center,

E-mail: gdragoi@mix.mmi.pub.ro

 

pp. 383-388

 

LOCATION AND DISPERSION EFFECTS IN SINGLE-RESPONSE SYSTEM DATA FROM TAGUCHI ORTHOGONAL EXPERIMENTATION
 

Tatjana ŠIBALIJA, Vidosav D. MAJSTOROVIĆ, Sebastian Marius ROŞU

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Abstract: The identification of the control parameter effects on location (mean) and dispersion (variation) of the observed product quality characteristic (response) is the crucial issue in industrial experiments, for improving manufacturing process robustness. This paper discuss the use of the Taguchi's robust parameter design method for the optimisation a single-response system -  automatic enamelling process in the cookware processing technology, for the product quality improvement. The analysis of experimental results was performed using location and dispersion modelling. The results were compared with the results of the commonly-used ANOVA analysis, and it showed the importance and effectiveness of the location and dispersion modelling approach in revealing significant effects of the control parameters and interactions on the response mean and variation.

 

Key words: quality improvement, Taguchi robust design, location, dispersion.

 

Authors:

M.Sc., Tatjana ŠIBALIJA, University of Belgrade, Mechanical Engineering Faculty, Laboratory for Production Metrology and TQM, Belgrade, Serbia,

E-mail: sibalija@yahoo.com

PhD, Vidosav D. MAJSTOROVIC, Professor, University of Belgrade, Mechanical Engineering Faculty, Laboratory for Production Metrology and TQM, Belgrade, Serbia,

E-mail: vidosav.majstorovic@sbb.rs

PhD, Sebastian Marius ROŞU, Special Telecommunications Service, IT Department, Bucharest, Romania,

E-mail: sebastianrosu@stsnet.ro

 

pp. 389-392

 

 INTERCOMPANY training as a technology for company management staff development

 

Venelin TERZIEV

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Abstract: The concept of intercompany training is presented in the paper. The essence of the approaches applied, the syllabi and assessment of training are made clear. The efficiency of the training from the point of view of employees, lecturers and user-companies has been demonstrated.

 

Key words: training, approaches, syllabi, efficiency.

 

Authors:

Econ, Venelin TERZIEV, Lecturer, University of Economics, Varna,

E-mail: terziev@skmat.com