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Journal PROCEEDINGS IN MANUFACTURING SYSTEMS |
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ISSN 2067-9238 |
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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
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
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 |
Journal
PROCEEDINGS IN MANUFACTURING SYSTEMS
□ Volume 5, No. 2, 2010
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
Ioan BÂRSAN, Ilie POPP, Electro-hydraulic servo-system stability analysis, pp. 101-108
Gear-Type Tool Profiling a Comparison between a CAD Method and the Analytical Method
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
AN APPROACH TO CONTROL OF MULTI-MOTOR ELECTROMECHANICAL SYSTEMS
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
SYSTEM IDENTIFICATION OF ASSEMBLY CELLS INCREASED ACCURACY AND DEMAND-DRIVEN RECONFIGURATION
Rainer MÜLLER1, Martin ESSER2, Christian JANSSEN3, Matthias VETTE4
Abstract: Todays 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
VIRTUAL ENTERPRISE NETWORKS SOLUTIONS TO SUPPORT THE VIRTUAL TEAMS WORK
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 teams 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
OPTIMIZATION OF CUTTING CONDITIONS WHEN FIVE AXIS MILLING USING BALL NOSE END MILLS. THEORETICAL STUDY
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 3 PhD, Lecturer, North University of Baia Mare, IMTech, Victor Babes 62A, Tel. 0040 0362.401.265, marius.cosma@ubm.ro
Analysis of springback in the case of rectangular drawn parts made from aluminium alloy sheets
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
MINIMIZING THE ERRORS OF SURFACE MACHINING THROUGH INTERPOLATION ON NUMERICAL CONTROL MACHINE TOOLS
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
SIMULATION POTENTALITIES FOR A RECIPROCATING COMPRESSOR
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
ELECTRO-HYDRAULIC SERVO-SYSTEM STABILITY ANALYSIS
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
EXPERIMENTAL INVESTIGATION AND OPTIMIZATION OF KERF CHARACTERISTICS IN ABRASIVE WATERJET TREPANNING OF THICK KEVLAR-EPOXY COMPOSITES
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
Study of analyasis of temperature and stresses of cutting tools during drilling of stainless steels
Jozef JURKO1, Mário GAJDO2, 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 Koice, Department of Manufacturing Technology, túrova 31, 080 01 Preov, 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 /
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