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PROCEEDINGS IN MANUFACTURING SYSTEMS

ISSN 2067-9238

 

 

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Editors

Adrian GHIONEA,

George CONSTANTIN

 

 

Series Editorial Team

Emilia BĂLAN

Sorin Mihai CROITORU

Costel Emil COTEŢ

 

 

Editorial Council

Traian AURITE, Alain GERARD, Csaba GYENGE, Florin IONESCU,

Constantin ISPAS, Branko KATALINIK, Stanislav LEGUTKO,

Aurel OPREAN, Eugen PAY, Daniel PLAY, Radu VOINEA

 

 

  

 

EDITURA ACADEMIEI ROMÂNE

Bucharest, 2010

 

 

University “Politehnica” of Bucharest

Machines and Production Systems Department

Splaiul Independenţei 313, sector 6

060032 Bucureşti, România

Tel: (+4021) 402 94 20

E-mail: orgcom@icmas.eu

http://www.icmas.eu

 

 

Editura Academiei Române

Calea 13 Septembrie nr. 13, sector 5

050711 Bucureşti, România

Tel.: (4021) 318 81 46, (4021) 318 81 06, Fax: (4021) 318 24 44

E-mail: edacad@ear.ro

http://www.ear.ro

 

 

Peer reviewers: acad. Radu VOINEA, Aurel OPREAN, Alain GERARD, Daniel PLAY

 

 

Editorial assistant: Irina FILIP

Computerized editing: George CONSTANTIN, Mariana ŞERBĂNESCU

 

 

Reviewing Committee

 

Gheorghe AMZA, Romania

Traian AURITE, Romania

Laurean BOGDAN, Romania

Octavian BOLOGA, Romania

Iooan BONDREA, Romania

Gheorghe BRABIE, Romania

Daniel BRUN-PICARD, France

Olivier CAHUC, France

Gavrilă CALEFARIU, Romania

Ilie CATANĂ, Romania

George CONSTANTIN, Romania

Radu COTEŢIU, Romania

George DOBRE, Romania

George DRĂGHICI, Romania

Gabriel FUMUŞANU, Romania

Alain GERARD, France      

Adrian GHIONEA, Romania

Marius GURAN, Romania

Csaba GYENGE, Romania

Florin IONESCU, Germany

Sorin IONESCU, Romania

Mihaiela ILIESCU, Romania

Kostadin KOSTADINOV, Bulgaria

Ivan KURIC, Slovakia

Stanislav LEGUTKO, Poland

Nicolae MARINESCU, Romania

Josef NOVAK-MARCINCIN, Slovak Republic

Constantin MINCIU, Romania

Sevasti MITZI, Grece

Vasile NĂSUI, Romania

Tadeusy NIESZPOREK, Poland       

Nicolae OANCEA, Romania

Viorel PĂUNOIU, Romania

Daniel PLAY, France

Dan PRODAN, Romania

Ştefan Dan PASTRAMĂ, Romania

Tomasz RYDZKOWSKI, Poland

Jean François RIGAL, France

Gheorghe SINDILĂ, Romania

Ion SIMIONESCU, Romania

Laurenţiu SLĂTINEANU, Romania

Ştefan STAICU, Romania

Constantin STĂNCESCU, Romania

Eugen STRĂJESCU, Romania

Ioan TĂNASE, Romania

Miron ZAPCIU, Romania

 

 

 

 

 

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Journal

 

PROCEEDINGS

IN MANUFACTURING SYSTEMS

 

Volume 5, No. 2,  2010

 

 

Contents

 

• Gabriel FRUMUŞANU, Siliviu BERBINSCHI, Virgil TEODOR, Nicolae OANCEA, Gear-type tool profiling – a comparison between a CAD method and the analytical method, pp. 61-66

 

• Mikho MIKHOV, An approach to control of multi-motor electromechanical systems, pp. 67-70

 

• Rainer MÜLLER, Martin ESSER, Christian JANSSEN, Matthias VETTE, System identification of assembly cells –increased accuracy and demand-driven reconfiguration, pp. 71-76

 

• Sebastian Marius ROŞU, George DRĂGOI, Luminiţa ROŞU, Virtual enterprise networks solutions to support the virtual teams work, pp. 77-80

 

• Vlad DICIUC, Mircea LOBONŢIU, Marius COSMA, Optimization of cutting conditions when five axis milling using ball nose end mills. Theoretical study, pp. 81-86

 

• Neculai NANU, Gheorghe BRABIE, Analysis of springback in the case of rectangular drawn parts made from aluminium alloy sheets, pp. 87-90

 

• Gheorghe STAN, Minimizing the errors of surface machining through interpolation on numerical control machine tools, pp. 91-94

 

• Christian LANDSCHUETZER, Andreas WOLFSCHLUCKNER, Simulation potentalities for a reciprocating compressor, pp. 95-100

 

• Ioan BÂRSAN, Ilie POPP, Electro-hydraulic servo-system stability analysis, pp. 101-108

 

• Tauseef Uddin SIDDIQUI, Mukul SHUKLA, Experimental investigation and optimization of kerf characteristics in abrasive waterjet trepanning of thick kevlar-epoxy composites, pp. 109-112

 

• Jozef JURKO, Mário GAJDOŠ, Tadeusz ZABOROWSKI, Study of analyasis of temperature and stresses of cutting tools during drilling of stainless steels, pp. 113-116

 

  

pp. 61-66

 

Gear-Type Tool Profiling – a Comparison between

a CAD Method and the Analytical Method

 

 View full text
 

Gabriel FRUMUŞANU1, Siliviu BERBINSCHI2, Virgil TEODOR3, Nicolae OANCEA4

  

Abstract: A CAD method, developed under the CATIA soft, in order to profile a gear-type tool for generating an ordinate whirl of profiles, associated to a couple of rolling centrods, is presented. The method is based on synthesizing some “virtual mechanisms”, to reproduce the enveloping profiles principle: rolling between the centrods associated to the tool and to the workpiece, by satisfying the enveloping condition. A comparison between the results given by the new method and those obtained by using the analytical “Trajectories Method” is made. The included applications are concerning embracing profiles, (case of interior tangency between the rolling centrods) as well as profiles generated through exterior tangency.

 

Key words: gear-type tool, enveloped surfaces, CAD profiling, virtual mechanism.

 

PhD, Prof., Manufacturing Science and Engineering Department, gabriel.frumusanu@ugal.ro

2 Assist. Prof., PhD Student, Machine Elements an Engineering Graphic Department, silviu.berbinschi@ugal.ro,

3 PhD, Lecturer, Manufacturing Science and Engineering Department, virgil.teodor@ugal.ro

4 PhD, Prof., Manufacturing Science and Engineering Department, nicolae.oancea@ugal.ro

University "Dunărea de Jos" of Galaţi, Domnească str. 111, 800201 – Galaţi, Romania

 

 

pp. 67-70

 

AN APPROACH TO CONTROL OF MULTI-MOTOR ELECTROMECHANICAL SYSTEMS

 

 View full text
 

Mikho MIKHOV1

 

 

Abstract: An approach to synchronization of the main controlled variables and their ratios in multi-motor drive systems is presented in this paper. According to the offered control algorithm synchronization is always carried out with respect to the lagging electric drive, as determination of the master drive takes place automatically. Application of the described control method to speed synchronization has been studied and discussed. Analysis of the respective dynamic and static regimes shows that the applied control algorithm can provide good synchronization of the controlled variables. The developed computer simulation models and the results obtained can be used in optimization and tuning of such types of multi-motor electromechanical systems.

 

Key words: multi-motor driving system, synchronized control, synchronization of speed ratios, accuracy improvement.

 

1. PhD, Assoc. Prof., Technical University of Sofia,

      Faculty of Automatics,

      8 Kliment Ohridski Blvd., 1797 Sofia, Bulgaria,

      Tel.: +359 2 965 2946, E-mail: mikhov@tu-sofia.bg

  

 

pp. 71-76

 

SYSTEM IDENTIFICATION OF ASSEMBLY CELLS –

INCREASED ACCURACY AND DEMAND-DRIVEN RECONFIGURATION

 

 View full text
 

Rainer MÜLLER1, Martin ESSER2, Christian JANSSEN3, Matthias VETTE4

 

Abstract: Today’s industrial assembly systems have to enable individualized production as well as featuring a high degree of automation to cope with both quality requirements and increasing cost pressure. One approach in engineering flexible assembly cells is to use co-operating robots. In order to automate small series economically, these assembly systems are programmed offline. To avoid extensive online correction and resulting long downtimes, discrepancies between the simulation model and the real cell have to be minimized. Therefore, the kinematic parameters of the assembly system are to be identified. The whole system will be broken down to basic subsystems whose properties are determined by measurement. The relevant parameters can be calculated from these measurements and subsequently used with offline programming methods.

 

Key words: assembly, tolerance concept, robotics, reconfiguration.

 

1 Prof. Dr.-Ing. Rainer Müller

2 Dr.-Ing. Dipl.-Kfm. Martin Esser

3 Dipl.-Wirt.-Ing. Christian Janßen

4 Matthias Vette M.Eng.

  Laboratory of Machine Tools and Production Engineering (WZL)

  Chair of Assembly Systems

  Steinbachstr. 19 D-52074 Aachen

  Tel.: +49-241-80-20607

  Fax: +49-241-80-22293

  E-mail address: M.Vette@wzl.rwth-aachen.de

 

 

pp. 77-80

 

VIRTUAL ENTERPRISE NETWORKS SOLUTIONS TO SUPPORT THE VIRTUAL TEAMS WORK

 

 View full text
 

Sebastian Marius ROŞU1, George DRĂGOI2, Luminiţa ROŞU3

 

Abstract: In the 21st century, the enterprises continuous implement ICT strategies & architectures to improve manufacture, research, products quality, sales, services and to costs control. All enterprises have a local area network, a virtual private network, an Intranet and Internet, servers and workstations for operations, administration and management working together for the same objective: profits. The virtual team’s concepts are discussed in this article. This work analyzes the network architecture for a geographically dispersed enterprise (seen as a virtual enterprise) as support for virtual teams work.

 

Key words: enterprise, enterprise network, virtual enterprise, virtual network, virtual team.

 

1 PhD, Eng., Special Telecommunications Service, Information Technology Department, 323A Splaiul Independentei, Sector 6, Bucharest, 060032, Romania, Tel. 0721333693,

E-mail: sebastianrosu@stsnet.ro

2  PhD, Prof., University “Politehnica” of Bucharest, Faculty of Engineering in Foreign Languages, PREMINV Research Center, 313 Splaiul Independentei, Sector 6, Bucharest, 060042, Romania, E-mail: dragoi.george23@gmail.com,

3 Proiect SA, Buzău, Romania, 120020, str. Unirii, Bl. 13 A,         E-mail: luminita.rosu@yahoo.com

 

 

pp. 81-86

 

OPTIMIZATION OF CUTTING CONDITIONS WHEN FIVE AXIS MILLING USING BALL NOSE END MILLS. THEORETICAL STUDY

 

 View full text
 

Vlad DICIUC1, Mircea LOBONŢIU2, Marius COSMA3

 

Abstract: This paper tackles the concept of parametric graphical design of the undeformed chip when five axis milling with ball nose end mills. Based on this model, the assessment of the cutting conditions and the optimization of these conditions with respect to the cross sectional area of the chip, the contact length of the cutting edge with the undeformed chip and the tool tilting angle. These cases will be studied and summarized and based on the results, experimental validation will be proposed. 

 

Key words: undeformed chip, contact length, cross sectional area, ball nose end mill.

 

1 Eng, PhD Student, North University of Baia Mare, IMTech, Victor Babes 62 A,

Tel. 0040 0362.401.265, vlad.diciuc@ubm.ro

2 PhD, Prof., North University of Baia Mare, IMTech, Head of Department, Victor Babes 62 A, Tel. 0040 0362.401.265

 mircea.lobontiu@ubm.ro

3 PhD, Lecturer, North University of Baia Mare, IMTech, Victor Babes 62A, Tel. 0040 0362.401.265, marius.cosma@ubm.ro

 

 

pp. 87-90

 

Analysis of springback in the case of rectangular

drawn parts made from aluminium alloy sheets

 

 View full text
 

Neculai NANU1, Gheorghe BRABIE2

 

Abstract: The cold plastic drawing of metal sheets leads after the tools removing to an undesired phenomenon named springback. The springback generates the modification of the final part shape from its theoretical shape. In order to perform an accurate design of the forming process it is necessary to know and control this instability phenomenon. The present paper analyzes the influence of different factors on the springback parameters in the case of rectangular drawn parts made from aluminium sheets.

 

Key words: drawing process, springback, deviations rectangular parts, 3D scanning.

 

Eng, PhD Student, University of Bacau, CCIMT,

E-mail: nicu.nanu@ub.ro

2 PhD, Eng, Prof., University of Bacau, Industrial Engineering Department, E-mail: g-brabie@ub.ro

 

 

pp. 91-94

 

MINIMIZING THE ERRORS OF SURFACE MACHINING THROUGH INTERPOLATION ON NUMERICAL CONTROL MACHINE TOOLS

 

 View full text

 

Gheorghe STAN1

 

Abstract: The main theme refers to the increase of the machining accuracy through minimizing the path error while machining through circular, or other kind of interpolation on numerical control milling, boring and milling grinding or turning machines. Currently the process of path error minimization while machining on numerical control machine tools is explored at a low extent because of the absence of the dependence relations between the path error and the parameters of the transient duty of each kinematical axis taking part to the interpolation of the work piece contour. This work is also establishing and analyzing the relations of dependence between the path error and the response time of the kinematical axes involved in machining through circular interpolation.

 

Key words: contour, error, interpolation, response time, machine tools.

 

1 PhD, Prof., University “Vasile Alecsandri” of Bacau, Engineering Faculty, Calea Mărăşeşti, nr. 157, 600115, Bacau, Romania; tel./fax: 0234/580170, e-mail address: ghstan@ub.ro

 

 

pp. 95-100

 

SIMULATION POTENTALITIES FOR A RECIPROCATING COMPRESSOR

 

 View full text

 

Christian LANDSCHUETZER1, Andreas WOLFSCHLUCKNER2

 

Abstract: In the development of piston compressors for tire repair systems in the automotive sector it is increasingly important to use numerical simulation methods. On the one hand in order to reduce test costs, on the other hand to shorten the development time. The research objective of this work is to find the optimization potential of a piston compressor by the use of finite element- and MBS-programs. Several simulation models are created. The model for the thermal behavior provides the temperature distribution on the surface of the compressor. For the investigation of the vibration characteristics the natural frequencies from the compressor are identified. Furthermore the vibrations under operating conditions are analyzed. Result of the mechanical analysis is a dynamic visualization of the stresses in the crank-parts during a shaft rotation. These results make it possible to reduce the weight of the compressor parts.  There are also made measurements and analytical calculations for validating the models.

                         

Key words: piston compressor, tire repair system, simulation.

 

PhD, Eng, Assist. Prof., E-mail: landschuetzer@tugraz.at

2 Eng, PhD Student, E-mail: wolfschluckner@tugraz.at

TU Graz, Institute of Logistics Engineering, Graz Austria

Tel +43 (316) 873 7325 , Fax +43 (316) 873 107325

 

 

pp. 101-108

 

ELECTRO-HYDRAULIC SERVO-SYSTEM STABILITY ANALYSIS

 

 View full text

 

Ioan BÂRSAN1, Ilie POPP2

 

Abstract: The present research refers to the analysis and the synthesis of an electro-hydraulic servo-system, specific to heavy machine tools. It is presented the construction and the functionality of the servo-system, the physical elements of design and its mathematical modelling, the correspondent transfer function and the results of the research, with the afferent restrictions.

 

Key words: servo-system, electro-hydraulic, modelling, research.

 

PhD, Prof., ULB Sibiu, Department: Machines and Equipments, , Emil Cioran Str. No. 4 Sibiu, Tel./Fax, 0269216061/454,

E-mail: ioan.barsan@ulbsibiu.ro

2 PhD, Assoc. Prof, ULB Sibiu, Department: Machines and Equipments, Emil Cioran Str. No. 4 Sibiu, Tel./Fax, 0269216061/454, E-mail: ilie.popp@ulbsibiu.ro

 

 

pp. 109-112

 

EXPERIMENTAL INVESTIGATION AND OPTIMIZATION OF KERF CHARACTERISTICS IN ABRASIVE WATERJET TREPANNING OF THICK KEVLAR-EPOXY COMPOSITES

 

 View full text

 

Tauseef Uddin SIDDIQUI1, Mukul SHUKLA2

 

Abstract: Abrasive water jets (AWJs) are widely useful for machining, shaping and drilling aerospace grade materials like composites, ceramics and super alloys unlike other advanced machining processes due to its non-thermal characteristics. However, due to the inherent characteristics of AWJs, some striation marks are observed at the exit side of jet which results in an inferior surface quality and necessitates finishing operations. Therefore, to obtain economic and better quality AWJ products, optimum selection of process parameters is very important and critical. This paper embodies an experimental investigation for optimized design in AWJ trepanning of aircraft grade Kevlar-epoxy composites using design of experiment based Taguchi method. In the present paper, kerf characteristics such as surface roughness have been selected for evaluating the AWJ drilling performance. Four major operating parameters namely, water jet pressure, abrasive flow rate, quality level and abrasive grit size have been considered for experimentation. A mixed Taguchi orthogonal array L18(21×37) is used for carrying out exhaustive experimental work. It was found that higher water jet pressure and quality level, 120 mesh (125 µm) fine garnet abrasive and medium value of abrasive flow rate is desirable for better surface finish. 3-D micrographs obtained by using image analysis software clearly showed the improvement in surface finish at the optimum settings in comparison to the initial ones. Delamination crack length was also determined by SEM.

 

Key words: Abrasive water jets (AWJs), process parameters, optimum selection, Kevlar-epoxy composites, roughness, image analysis, delamination crack length.

 

Lecturer, Mechanical Engineering Department, I.E.T, M.J.P. Rohilkhand University, Bareilly-243006, India, TEL: +91-9410405980, Fax: +91-581-2524232,

E-mail: tauseefus@gmail.com

2 Senior lecturer, Mechanical Engineering Science Department, University of Johnesberg, South Africa,

E-mail: mshukla@uj.ac.za

 

 

pp. 113-116

 

Study of analyasis of temperature and stresses of cutting tools during drilling of stainless steels

 

 View full text
 

Jozef JURKO1, Mário GAJDOŠ2, Tadeusz ZABOROWSKI3

 

Abstract: The article deals with the cutting process analysis with CA-X systems for drilling. This paper presents the results of experiments that concerned the verification of temperatures and stresses of cutting tool during drilling of a part from a new Stainless Steel with low carbon and analysis of cutting tool wear. The results of cutting zone evaluation were obtained under cutting conditions - cutting speed vc = 50 m/min, depth of cut equals one half of cutting tool diameter ap = 2.75 mm, and feed f= 0.05 mm/rev. For a new stainless steels, the acquired results are interesting because for the defined conditions we can achieve a surface quality after cutting having the roughness parameters reduced to around 0.72 µm. Very good results were mainly achieved when cutting speed was 50 m/min and feed was 0.05 mm/rev.

 

Key words: simulation, drilling, cutting zone, cutting tool, wear, stainless steels

 

1  Assoc. Prof., Technical University of Košice, Department of Manufacturing Technology, Štúrova 31, 080 01 Prešov, Slovakia, Tel./Fax: +421-51-7722603/+51-7733453,

   E-mail:  jozef.jurko@tuke.sk

2  Production manager, ELBA, a.s. Kremnica, ČSA 264/58, 967 01 Kremnica, Slovakia, Tel.: +421-45-6704 151,

   E-mail: mgajdos@elba.sk

3  Prof.-senior lecturer, Technical University of Gorzow, Research and Development Institute, 66-400 Gorzów Wielkopolski, Łokietka 29, Poland, E-mail: tazab@sukurs2.pl

 

 

Electronic mail: orgcom@icmas.eu   /