Journal 

PROCEEDINGS IN MANUFACTURING SYSTEMS

 

ISSN 2343–7472

ISSN-L 2067-9238

 

 

 

 

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Journal

PROCEEDINGS

IN MANUFACTURING SYSTEMS

 

Volume 11, Issue 1,  2016

 

 

Contents

 

·             Vidosav MAJSTOROVIC, Slavenko STOJADINOVIC, Numan DURAKBASA,

                Path planning for inspection prismatic parts on CMM as a part of cyber-physical manufacturing metrology model

 

·             Prashant J. Patil, Chandrakant R. Patil,

                Optimization of process parameters of surface grinding operation using Taguchi based Grey relation analysis

 

·             Tudor-George ALEXANDRU, Theodor-Adrian MANTEA, Cristina PUPǍZǍ, Ştefan VELICU,

                Heat transfer simulation for thermal management of electronic components

 

·             Dan PRODAN, Mișu PETRE, George CONSTANTIN, Anca BUCUREȘTEANU,

                Eliminating the backlash of circular feed drives of CNC vertical lathes

 

·             Robert FILEP, Dragos AROTĂRIȚEI2, Marius TURNEA,Mihai ILEA, Mariana ROTARIU, Cristian BUDAC,

                A viscoelastic model for skin of stump in transtibial prosthesis

 

·             Anca BUCUREȘTEANU, Dan PRODAN, Emilia BĂLAN, Adrian MOTOMANCEA,

                Modernization of cooling units for tools and blanks in machine tools

 

·             Nicolae ILIAȘ, Iosif ANDRAȘ, Sorin Mihai RADU, Iosif GRUNEANȚU, Aurelian SERAFINCEANU,

                Innovative equipment for improved coal extraction technology in thick seams

 

 

 

pp. 3-8                           View full text

 

PATH PLANNING FOR INSPECTION PRISMATIC PARTS ON CMM AS A PART OF CYBER – PHYSICAL MANUFACTURING METROLOGY MODEL

Vidosav MAJSTOROVIC1,*, Slavenko STOJADINOVIC2, Numan DURAKBASA3

 

1) Professor, PhD, University of Belgrade, Faculty of Mechanical Engineering, Department for Production Engineering, Belgrade, Serbia

2) PhD Student, Assistant Prof., University of Belgrade, Faculty of Mechanical Engineering, Department for Production Engineering, Belgrade, Serbia

3) Professor, PhD,Vienna University of Technology, Faculty of Mechanical and Industrial Engineering, Department for Interchangeable  Manufacturing and Industrial Metrology, Vienna, Austria

 

 

Abstract: Cyber-Physical System (CPS) are systems of collaborating computational entities which are in intensive connection with the surrounding physical world and its on-going processes, providing and using, at the same time, data-accessing and data-processing services available on the internet. The essence of this research is development Intelligent Model for Inspection Planning (IMIP) on CMM as support of Cyber-Physical Manufacturing Metrology Model and its metrology integration into coordinate measuring machine (CMM) inspection process planning for prismatic parts. Presented model is advanced feature-based inspection approach, whose advantage is in reduction the total measurement time by reducing the time needed for the preparation of the measurements and allowed opportunities for its optimization using one of the methods such as swarm theory. Needed geometrical information for feature description is taken from files IGES and STL. Output from the IMIP is point-to-point measuring path without collision between measurement probe and prismatic part. Distribution of measurement points for basic geometrical features is performed on the base modifies Hamersley principle. The results of the inspection of both PPs show that all tolerances are within the specified limits. This confirms the efficiency of the proposed feature-based model in IMIP of PPs. The model is especially suitable for use in case of measuring path planning for geometrically complex PPs with large numbers of tolerances.

 

Key words: Cyber-Physical Manufacturing, Digital Quality, Path Planning, Prismatic Parts, CMM.

 

 

pp. 9-14         View full text

  

OPTIMIZATION OF PROCESS PARAMETERS OF SURFACE GRINDING OPERATION USING TAGUCHI BASED GREY RELATION ANALYSIS

 

Prashant J. Patil1,*, Chandrakant R. Patil2

 

1) Eng, Principal, Abhinav Education Society’s COET(P) Pune, India

2) Prof. in Mech. Dept, Ram Meghe College of Engg. and Management, Amravati, India

 

 

Abstract: Heat produced during the grinding process is always critical in terms of workpiece quality. Effective cooling and lubrication is necessary to control temperature levels. Traditional cooling system has negative impact in terms of cost of recycling and health hazard to machine operator. Most successful fluid reduction method employed in grinding is minimum quantity lubrication (MQL). This study aims for multi objective optimization of MQL grinding process parameters using Grey relational analysis. Water based Al2O3 and CuO nanofluids of various concentrations are used as lubricant for MQL system. Experiments were performed using L27 orthogonal array on instrumented surface grinding machine as per Taguchi’s method. The process parameters that considered for optimization are feed rate, depth of cut, type of lubricant, grinding wheel speed, coolant flow rate, and nanoparticle size. Grinding performance is measured in terms of cutting force and temperature of grinding zone. Analysis of variance (ANOVA) has been used to identify most significant factor of the process.

 

Key words: CuO, Al2O3 nanofluids, MQL surface grinding, tangential force, effective thermal conductivity.

 

 

pp. 15-26       View full text

 

HEAT TRANSFER SIMULATION FOR THERMAL MANAGEMENT OF ELECTRONIC COMPONENTS

 

Tudor-George ALEXANDRU1*, Theodor-Adrian MANTEA2, Cristina PUPǍZǍ3, Ştefan VELICU4

 

1) Eng., Machines and Manufacturing Systems Department, University "Politehnica" of Bucharest, Romania

2) PhD Student, Machines and Manufacturing Systems Department, University "Politehnica" of Bucharest, Romania

3, 4) Prof., PhD, Machines and Manufacturing Systems Department, University "Politehnica" of Bucharest, Romania

 

 

Abstract: The present research addresses electronics design issues with emphasis on the heat transfer simulations. The first part comprises a brief introduction to the electronics design workflow. The problem of the heat transfer is discussed at all engineering levels. Due to the complexity of this problem, multiphysics aspects remain in a close relationship with the thermal management systems. Such issues place the heat transfer simulation as a central design problem. Further decisions like economic, environmental, ergonomic or performance aspects remain sensitive to the solution of the heat transfer analyses. In the second part of the work, the heat transfer problem statement is described. Engineering knowledge achievements and their relationship with a PLM platform are schematically discussed. The most common heat transfer solvers are presented and the simulation peculiarities for the electronic components are emphasized. All this concepts are validated in the third part of the work, where two case studies are presented. First, an example of natural convection transfer for a heat sink was performed, in order to define theoretical aspects regarding the heat sink evaluation and to demonstrate how non-linear solvers based on the Finite Element Method can assess the transient temperature behavior. The second study was an experimental forced-convection steady-state cooling setup, simulated using Computational Fluid Dynamics. Numerical and experimental results for this simulation proved a good match. Concluding remarks were highlighted at the end of the paper.

 

Key words: electronics, design, cooling, heat transfer, knowledge, FEM, CFD.

 

 

pp. 27-34       View full text

 

ELIMINATING THE BACKLASH OF CIRCULAR FEED DRIVES OF CNC VERTICAL LATHES

Dan PRODAN1,*, Mișu PETRE2, George CONSTANTIN3, Anca BUCUREȘTEANU4

 

1, 3, 4) Prof., PhD, Eng., Machines and Manufacturing Systems Department, University “Politehnica” of Bucharest, Romania

2) Eng., Head of Design Department, Titan Heavy Machine Tools, Bucharest, Romania

 

 

Abstract: Most circular feed and/or positioning kinematic chains used in CNC machine tools consist of: AC motor with speed adjustment through frequency, mechanical gearbox and a final pinion-wheel mechanism type. All the above mechanisms have functional backlashes that cumulated affect the positioning and processing accuracy. The paper presents some specific issues regarding the design, construction and operation of vertical lathes having such kinematic chains. Different variants of anti-backlash devices used by companies specialized in the production of vertical lathes are presented. Some hydro-mechanical solutions using two pinions for the final gear mechanism are presented in which the hydraulic unit is supplying the necessary torque that force one pinion to work on one flanks of the wheel teeth and the other one on opposite flanks. Some solutions with parallel pinion axes and also with coaxial axes of pinions are presented. The article presents some patents used in the field of cancelling backlash in final gears of feed drives of machine tools. Also, the papers brings in discussion the solution with eliminating backlash by using two pinions separately driven through two drives driven by own electric motors working in the Master/Slave regime.  The machines and solution of cancelling 100% of the backlash are belonging to the group of vertical lathes with tables having diameters between 1250 mm and 20000 mm.

 

Key words: vertical lathe, backlash, anti-backlash designs, hydro-mechanical systems, electrical systems.

 

 

pp. 35-40       View full text

 

A VISCOELASTIC MODEL FOR SKIN OF STUMP IN TRANSTIBIAL PROSTHESIS

Robert FILEP1, Dragos AROTĂRIȚEI2,*, Marius TURNEA3, Mihai ILEA4, Mariana ROTARIU5, Cristian BUDACU6

 

1) PhD Student, OrtoProfil, Tg. Mures, Romania

2) Prof., PhD, University of Medicine and Pharmacy "Grigore T. Popa", Iasi, Romania

3) Lecturer, PhD, University of Medicine and Pharmacy "Grigore T. Popa", Iasi, Romania

4) Lecturer, PhD, University of Medicine and Pharmacy "Grigore T. Popa", Iasi, Romania

5) Assistant Prof., PhD, University of Medicine and Pharmacy "Grigore T. Popa", Iasi, Romania

6) Assistant Prof., PhD, University of Medicine and Pharmacy "Grigore T. Popa", Iasi, Romania

 

 

Abstract: The displacement of different parts during gait cycle as force and pressure effect can contribute to developing and increasing of lesions. In present paper we investigate the viscoelastic model for prosthetic skin using a rheological model, the Maxwell slip model.  We propose a Maxwell model for hysteretic behavior of skin (force vs. displacement) at the interface of stump-socket in transtibial prosthetic case. Various methods for parameter optimization in the Maxwell model are discussed and a novel method is proposed: genetic algorithm with multiple separated chromosomes in order to find the minimal number of elasto-elements with maximum performance of model. The Force and displacements are measured using Finite element model (FEM ) and simulations. The experimental results of simulation take into account two different form of hysteresis for two different locations on stump.

 

Key words: Hysteresis, Maxwell model, genetic algorithms, stump-liner and stump socket interface, transtibial prosthesis, finite element model.

 

 

pp. 41-46    View full text

 

MODERNIZATION OF COOLING UNITS FOR TOOLS AND WORKPIECES IN MACHINE TOOLS

 

Anca BUCUREȘTEANU1,*, Dan PRODAN1, Emilia BĂLAN2, Adrian MOTOMANCEA3

 

1) Prof., PhD, Eng., Machines and Production Systems Department, Politehnica University, Bucharest, Romania

2) Assoc. Prof., PhD, Eng., Machines and Production Systems Department, Politehnica University, Bucharest, Romania

3) Assoc. Prof., PhD, Eng., Mechanics Department, Politehnica University, Bucharest, Romania

 

 

Abstract: This paper presents some specific issues of the design and manufacturing of cooling units for tools and workpieces in machine tools during the cutting process. Besides the general theoretical aspects, adaptable to most of the existing machine tools, the paper lays particular emphasis on the aspects specific to modern machine tools (CNC ones), on which the machining operations are performed with high speed cutting, in the case of serial or mass production. Also this paper presents some of the simulations made in the design phase of the unit. Using these simulations one can check the behaviour of the unit before it being made, avoiding choosing unapproved parts. The unit designed and manufactured is intended for a milling machining centre with horizontal spindle, type MAXIM 11 and allows the cooling of the tool and workpiece by programmed control on the outside of the tool but, where appropriate, through the inside of the tool. The unit also allows the cooling with air or the blowing of the tool-holder taper during the automatic changing of this one from the tool-magazine. Now the unit manufactured for milling machining centre with horizontal spindle of MAXIM 11 type is functional and did not raise operating or maintenance problems for more than two years. Cooling on the outside of the tool is done with the machine working at a maximum pressure of 10 bar. Cooling onside the inside of the tool is done with the machine working at a pressure of 70‒75 bar, but during commissioning it has also been tested at 90 bar.

 

Key words: machine tools, cooling unit, water emulsions, design, outside tool cooling, inside tool cooling.

 

 

pp. 47-52    View full text

 

INNOVATIVE EQUIPMENT FOR IMPROVED COAL EXTRACTION TECHNOLOGY IN THICK SEAMS

Nicolae ILIAȘ1, Iosif ANDRAȘ2,*, Sorin Mihai RADU3, Iosif GRUNEANȚU4, Aurelian SERAFINCEANU5

 

1, 3, 4, 5) Prof., PhD, University of Petroșani, Dept. Mechanical, Industrial and Transportation Engineering, Petroșani, Romania

2) PhD., Eng, GEROM INTERNATIONAL S.A., Petroșani, Romania

 

 

Abstract: The paper deals with a series of innovative solutions of equipment devised in order to improve the efficiency of mechanized coal faces in thick seams which avoids the inconveniences related to the effect of the increased face height on the on shearer, armored face conveyor(AFC) and shield supports, by a new concept of mechanized extraction complex. The presented system encompasses some innovative constructive changes on the shearer, on the face conveyor and shields, such as a new positioning of the shearer’s body and the drums symmetrically related to its longitudinal axis, a new concept of AFC, allowing the reduction of height and offering accessibility to chains and  flight bars and a new construction of shield allowing the increase of operating height with a shortest canopy, and offering a better kinematics in a wider range of working heights. The proposed system is only a concept, the  refining of it being suitable for the construction of a new generation of mechanized longwall faces with increased working height, with relevant  advantages in terms of productivity.

 

Key words: mining equipment, coal extraction, mechanized longwall face, shearer, AFC, support shield.

 

 

Electronic mail: orgcom@icmas.eu