Journal
PROCEEDINGS IN MANUFACTURING SYSTEMS
|
|
Journal PROCEEDINGS IN MANUFACTURING SYSTEMS |
|
ISSN 2067-9238 |
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, Romānia Tel: (+4021) 402 94 20 E-mail: orgcom@icmas.eu http://www.icmas.eu
Editura Academiei Romāne Calea 13 Septembrie nr. 13, sector 5 050711 Bucureşti, Romānia 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 Franēois 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. 1, 2010
· Claudiu BĪŞU, Miron ZAPCIU, Dorel ANANIA, Constantin ISPAS, Constantin MINCIU, Dynamic behaviour of machine tool motor spindle by Eddy current monitoring, pp. 3-8
· Ileana FULGA, Eugen STRĂJESCU,Studies concerning the particle conglomeration in the fluidic mills, pp. 9-14
· Dejan LUKIĆ, Velimir TODIĆ, Mijodrag MILOEVIĆ, Model of modern technological production preparation. pp. 15-22
· Adrian Stere PARIS, Constantin TĀRCOLEA, New stochastic models applied to manufacturing systems, pp. 23-26
· Romeo Cioară, Ruxandra Cioară, Experimental results as regards the quality of the surfaces obtained by precision cutting of the bars, pp. 27-30
· Tadeusz NIESZPOREK, Kazimierz ŁYCZKO, Generation of the worm helical surface, pp. 31-34
· Kazimierz ŁYCZKO, Tadeusz NIESZPOREK, Effect of the conditions and kinematics of working on the design of thread rolling tools, pp. 35-38
· Mircea LOBONŢIU, Ioan PAŞCA, Influence of tool axis inclination angle on the surface roughness in ball end milling of OLC45 (C45) material, pp. 39-44
· Laurenţiu SLĂTINEANU, Margareta COTEAŢĂ, Irina BEŞLIU GRIGORAŞ, Mihai BOCA, Elastic deflection of the cylindrical workpieces during the machining, pp. 45-48
· Elena RADU-COSTACHE, Gheorghe BRABIE, Analysis of thickness variation in the case of cylindrical micro drawn parts made of very thin metal sheets, pp. 49-52
· Jozef NOVAK-MARCINCIN,Application of virtual manufacturing in industrial practice, pp. 53-56
Dynamic behaviour of machine tool motor spindle by Eddy current monitoring
Claudiu BĪŞU, Miron ZAPCIU, Dorel ANANIA, Constantin ISPAS, Constantin MINCIU,
Abstract: The objectives of this paper were to measure the displacements of an integrated spindle of a milling machine tool using Eddy current transducers and to evaluate effects by signal processing and analysis in order to identify the causes. For achieving the objectives, we analyzed a number of elements by computing and processing signal considering the waveform and frequency and identifying defects and their location. To reduce the vibrations amplitudes of a circularity diagram on one or more rotations, we developed an experimental model with the aim of intervention on the defect for extending the lifetime of the element that generates vibrations.
Key words: vibrations, displacements, spindle motor, eddy-current, defect correction, lifetime.
1 PhD, Lecturer, e-mail: cfbisu@gmail.com. 2 PhD, Prof., e-mail: zapcium@yahoo.com 3 PhD, Lecturer , e-mail:dorel.anania@yahoo.com; 4 PhD, Prof., e-mail: ispas1002000@yahoo.fr 5 PhD, Prof., e-mail: constantin_minciu@yahoo.com Machines and Production System Departament. University "Politehnica" of Bucharest, Splaiul Independentei 313, Sector 6, 060042, Bucharest, Romania, tel/fax: +40214029724
Studies concerning the particle conglomeration in the fluidic mills
Ileana FULGA, Eugen STRĂJESCU,
Abstract: In this paper a documentary study about the problems of the researches oriented in the domain of particles size reduction is presented. These mills represent the most important type used in the powder metallurgy. The paper presents conclusions about the research directions to be considered in the future. Also the problems and the experimental researches for the particles conglomeration are presented. The considerations made in this paper are intended for future research of a serious and complete study of the conglomeration phenomena.
Key words: fluidic mill, spiral jets, micronization, conglomeration, particle flux, fluid jet speed.
1 Eng., PhD, APTM Suisse, Tel. 0041916474853, E-mail: a@fulga.com 2 Professor, PhD, head of department, University "Politehnica" of Bucharest, Romania, Machines and Production Systems Department, Splaiul Independentei 313, sector 6, Bucharest Tel. 004021745124475, E-mail: eugen_strajescu@yahoo.com
Model of modern technological production preparation
Dejan LUKIĆ, Velimir TODIĆ, Mijodrag MILOEVIĆ,
Abstract: Production system will work well, achieve growth and development if it satisfies requirements of the market, or if its products are functional, economical, have high quality and good design, if they are environmentally suitable, competitive and market acceptable products. Product development consists of two basic steps, or functions. The first step is product design based on functional, aesthetic and other requirements. The second step relates to the production process planning, whose activities are implemented within the technological production preparation.Technological production preparation tasks are solved in many different interrelated phases, starting from the global production planning and preliminary process planning, through the detailed process planning and to the generation of NC programs and necessary technological documentation. This paper will show a model of modern technological production preparation with appropriate activities, or phased in accordance with the requirements of modern business and engineering capabilities of new techniques and information technology.
Key words: technological production preparation, process planning, CAPP, CAM, CAPP-CAx.
1 MSc Assistant, Faculty of Technical Science, Department of Production Engineering, Trg D. Obradovica 6, 21000 Novi Sad, Serbia, +381 21 485 2331/454 495, lukicd@uns.ac.rs. 2 PhD, Prof., Head of Chair of Computer Supported Technological Systems and Design Processes Faculty of Technical Science, Department of Production Engineering, Trg D. Obradovica 6, 21000 Novi Sad, Serbia, +381 21 485-2346/454-495, todvel@uns.ac.rs. 3 MSc Assistant, Faculty of Technical Science, Department of Production Engineering, Trg D. Obradovica 6, 21000 Novi Sad, Serbia, +381 21 485 2331/454 495, mido@uns.ac.rs.
New stochastic models applied to manufacturing systems
Adrian Stere PARIS, Constantin TĀRCOLEA,
Abstract: A classical method of the analyzing the lifetime of the manufacturing systems is to use distributional laws, which take values on the bounded intervals, within which the stochastic repartitions are constrained to vary. Some adequate bounded distributions derived from classical models are developed and compared in the paper. The proposed laws are used for modeling reliability function and hazard-rate. The numerical examples prove that these models are adequate for practical applications.
Key words: lifetime distributions, failure function, hazard-rate function.
1 PhD, Math., Professor, University "Politehnica" of Bucharest, Department of Mathematics, Splaiul Independentei 313, Sector 6, 060042, Bucharest, ,Romania, E-mail: constantin_tarcolea@yahoo.com 2 PhD, Eng, Lecturer, University "Politehnica" of Bucharest, Materials Tehnology and Welding Department, Splaiul Independentei 313, Sector 6, 060042, Bucharest, Romania, E-mail: adrianparis@amza.camis.pub.ro
Experimental results as regards the quality of the surfaces obtained by precision cutting of the bars
Romeo Cioară, Ruxandra Cioară,
Abstract: Research conducted over several years led to design a new type of shearing device for cold cutting of bars, semi-closed, with elastic radial clamping of bar on both sides of the cutting plan, simple, compact, sealed and small dimensions. The originality of concept and construction was validated by patent. An experimental model was designed and made in very good condition. Experimental research relative to that was conducted entirely in laboratories of Economic Engineering and Production Systems Department at Transilvania University of Brasov, and covered several aspects. In this paper are presented results only on flatness and perpendicularity of parts cut with it.
Key words: cutting shear, cutting device, flatness, perpendicularity, invention.
1 PhD, Eng, Prof. Transilvania University of Brasov, Economic Engineering and Production Systems Department, professor, PhD, Eng., Zizinului str., no. 20, bl. 35, sc. C, ap. 40, 500414 Brasov, Romania, Tel./ Fax 0726367118 / 0268477113, cioarar@unitbv.ro 2 PhD. Eng, Conversion engineer, S.C. Cambric Consulting S.R.L., Zizinului str., no. 20, bl. 35, sc. C, ap. 40, 500414 Brasov, Romania Tel. 0726367119, cioarar@unitbv.ro.
Generation of the worm helical surface
Tadeusz NIESZPOREK, Kazimierz ŁYCZKO,
Abstract: The helical surface of a worm is most often formed using a rotary tool with the rectilinear axial profile of the tool action surface. It is very rarely machined with a tool of a circular or other profile. The worm surface is machined with a finger-type, disc-type, cup-type, or ring-type tool over the whole profile height. The form of machined surface is determined not only by the geometrical parameters and profile of the tool, but also by the tool type. The increasingly wide use of modern CNC machine tools and CAD/CAM type software applications enable also the development of technologies for machining helical surfaces. By the Lace Cut method using a finger-type spherical cutter, helical surfaces of any profile can be formed.
Key words: worm, helical surface, modelling, hobbing machining.
1 Prof., PhD, Eng, E-mail: tadek@itm.pcz.czest.pll 2 Dr, PhD, Eng., E-mail: kazimierzlyczko@op.pl Częstochowa University of Technology, Al. Armii Krajowej 21, 42-200 Częstochowa, Poland Tel. +48 34 3250 509
Effect of the conditions and kinematics of working on the design of thread rolling tools
Kazimierz ŁYCZKO, Tadeusz NIESZPOREK,
Abstract: The article contains issues regarding thread shaping with following methods: tangential, radial, axial and planetary which are all used in technology of thread rolling. The analysis of processing conditions was carried out - technological and rolling kinematics in relation to construction of rolling tools. On above basis the general quidelines and dependences that set basic construction parameters of flat dies were presented.
Key words: threads rolling, methods, tooling construction.
1 Prof., PhD, Eng, E-mail: tadek@itm.pcz.czest.pll 2 PhD, Eng., E-mail: kazimierzlyczko@op.pl Częstochowa University of Technology, Al. Armii Krajowej 21, 42-200 Częstochowa, Poland
Influence of tool axis inclination angle on the surface roughness in ball end milling of OLC45 (C45)
Mircea LOBONŢIU, Ioan PAŞCA,
Abstract: Ball end milling has a relatively high share in the cutting process. Due to the widespread use of this process it is essential to know the parameters that can influence the process to achieve the optimum and adequate quality of machined surface. Besides the cutting regime parameters for milling operations with ball nose end mills the angle of inclination of the cutting tool axis has a great importance. The present paper includes a summary of international investigation and optimization of surface quality depending on the parameters involved in the process and in particular the inclination of tool axis.
Key words: milling, roughness, ball end mill, angle, inclination.
1 Prof., PhD, North University of Baia Mare,.Str. Dr. Victor Babes, nr.62 A, Baia Mare, Romania, E-mail: mircea.lobontiu@ubm.ro, 2 PhD, North University of Baia Mare, Str. Dr. Victor Babes, nr.62 A , Baia Mare, Romania, E-mail: Ioan.Pasca@ubm.ro
Elastic deflection of the cylindrical workpieces during the machining
Laurenţiu SLĂTINEANU, Margareta COTEAŢĂ, Irina BEŞLIU GRIGORAŞ, Mihai BOCA,
Abstract: During the machining process, under the action of the cutting forces, the workpiece is usually elastically deflected and, as a consequence, the current depth of cut is different in comparison with the desired one, therefore the machined surface could present dimensional and shape errors. The deflection size is influenced by the rigidity of the machine tool, cutting tool, workpiece, working parameters (depth of cut, work feed and speed), geometry of the tool active part, workpiece material and dimensions, etc. For certain work conditions, the elastic deflection could be estimated by taking into consideration theoretical relations, but appropriate results could be obtained by experimental research. The paper presents some authors considerations concerning the modeling of the elastic deflection of the workkpiece held in the universal scroll chuck and tailstock live center. Such models could be used to establish the tool point path on CNC lathes, so that the possible machining errors to be avoided.
Key words: elastic deflection, rigidity, turning, universal scroll chuck, tailstock live center.
1 Prof.. PhD, Tel. +40 232 278680/2313/ Fax +40 232 217290, E-mail address: slati@tcm.tuiasi.ro. 2 Assistan Prof., Tel. +40 232 278680/2323, Fax +40 232 217290, E-mail address: mcoteata@tcm.tuiasi.ro. 3 Junior Assistant, Tel +40 230 216147/261, E-mail address: grigorasirina_sv@yahoo.com. 4 Ph.D. student, Tel. +40 232 278680/2317, Fax +40 232 217290, E-mail address: mihaitzaboca@yahoo.com. Technical University "Gheorghe Asachi" of Iaşi, Department of Machine Manufacturing Technology, D. Mangeron Street, 59A, 700050 Iaşi, Romānia.
Analysis of thickness variation in the case of cylindrical micro drawn parts made of very thin metal sheets
Elena RADU-COSTACHE, Gheorghe BRABIE,
Abstract: The micro deep drawing represents a cold forming process performed in order to realize micro parts. The main problems encountered in creating micro parts by micro drawing are as follows: the small thickness of material that can influence the drawing parameters and can affect the part quality; the small dimensions of parts that can influence the tools geometry and can create some problems in tools manufacturing; the instability phenomena (like: springback, wrinkling, necking, thickness variation etc.) that can affect the accuracy and quality of the produced micro-parts. The objective of the present work is to investigate and analyze an important instability and undesired phenomenon: thickness variation, phenomenon that can affect the springback intensity and the material integrity; the analysis was performed for the case of cylindrical drawn micro parts.
Key words: micro drawing; thin sheets; cylindrical micro-parts; thickness variation.
1 PhD Student 2 Prof., PhD, E-mail: g-brabie@ub.ro University of Bacău, Industrial Engineering Department, Calea Mărăşeşti, 157, 600115, Bacău, Romania
Application of virtual manufacturing in industrial practice
Jozef NOVAK-MARCINCIN
Abstract: Virtual Reality (VR) requires more resources than standard desktop systems do. Additional input and output hardware devices and special drivers for them are needed for enhanced user interaction. But we have to keep in mind that extra hardware will not create an immersive VR system. Special considerations by making a project of such systems and special software are also required. As the human performs actions like walking, head rotating (i.e. changing the point of view), data describing his/her behavior is fed to the computer from the input devices. The computer processes the information in real-time and generates appropriate feedback that is passed back to the user by means of output displays. In general: input devices are responsible for interaction, output devices for the feeling of immersion and software for a proper control and synchronization of the whole environment.
Key words: virtual reality, virtual manufacturing.
1 PhD, Prof., Technical University of Kosice, Faculty of Manufacturing Technologies in Presov, Slovak Republic, E-mail: jozef.marcincin@tuke.sk
Electronic mail: orgcom@icmas.eu /
| ||||||||||||||||
