Volume 11 / 2013 Issue 4

 

1. EDITOR'S NOTE
2. CONTENT OF ACADEMIC JOURNAL OF MANUFACTURING ENGINEERING
3. ABSTRACT

1. EDITOR'S NOTE

CREATIVITY AND INNOVATION- FUNDAMENTAL FEATURES OF THE 21st CENTURY

We live in the European area, a truly diverse space that abounds in creative energy and innovative ideas. More then ever, on the background represented by an intense competition and global challenges, the innovative practices and creative solutions stimulate the economical growth and welfare.

The scientific and technological progress is imposed by globalization, which makes innovation and knowledge more important than in the past. The opening of new markets creates new opportunities and tests our capabilities of facing the social consequences, as well. Passing to a knowledge based economy has the same importance as the previous transition from agriculture to industry.

At present it is hard to maintain the competitiveness just by increasing the productivity. Innovation and creativity must become keywords that lead to technological development, new products and more effective processes. Specialists from USA appreciate that nowadays the most important factors of economical growth are innovation (49 %), followed by productivity (27 %) and budget (24 %). These specialists consider that more than 80 % of the products we will buy in the following 10 years there have not been invented yet. From this perspective, innovation and creativity represent the engines of the modern economy. According to Richard Florida, the economical development is based on the 3T concept: Technology, Talent and Tolerance.

It is remarkable that the European Union, in the context of the evolution to the knowledge based society, aims at assuring the frame of an intelligent, competitive and durable development. This fact involves the integration of new technological structures with the research, development, innovation and education processes, and will lead to the development of the intellectual capital, the most important resource of the contemporary society.

In order to achieve these strategic objectives, EU established specific targets, such as: allocation of 3 % from the national GDP of every EU country to research and innovation until 2020; launching of the HORIZON 2020 program that it is correlated with the EU Strategy 2020 for research and innovation.

The HORIZON 2020 program, which will be substantially financed, is focused on transforming EU in a union of innovation, enhancing the cooperation between the business and academic environments, establishing new partnerships between universities and different institutions from the research and commercial domains, as well as improving the efficiency of the research and innovation systems.

In this European and global context, universities, especially those having a technical profile, will have to re-think their educational and academic processes, so as the accent will be put on creativity and innovation.

Prof.Dr.Eng. Petru BERCE

Technical University of Cluj-Napoca

 

2. CONTENT OF ACADEMIC JOURNAL OF MANUFACTURING ENGINEERING VOL.11, ISSUE 4/2013

1. Editor’s Note: CREATIVITY AND INNOVATION- FUNDAMENTAL FEATURES OF THE 21st CENTURY .....................................................................................................
2. PATIENT SPECIFIC INSTRUMENTS FOR TOTAL HIP REPLACEMENT SURGERY -- Drstvensek, I.; Brajlih, T.; Paulič, M.; Balic, J. andTomazic, T.......................................
3. RESEARCH ON THE DEFORMATIONS CAUSED BY THE MANUFACTURING DEVICES ONTO THE PARTS WITH LOW RIGIDITY -- Panc, N.; Vuscan, I. and Balc, N.
4. COMPARATIVE RESEARCH OF TWO MACHINING METHODS: LASER BEAM MACHINING AND ABRASIVE WATER JET MACHINING -- Legutko, S.; Krolczyk, G. and Wolf, M. ................................................................................................................... 
5. SOME CHARACTERISTICS ASPECTS REGARDING THE PRECISION MANUFACTURING OF WORM GEARS -- Gyenge, Cs.; Pacurar, A.; Pacurar, R. and Radu, S.A. ......................................................................................................................
6. CHIP REMOVAL CHARACTERISTICS IN ROTATIONAL TURNING AND THE EFFECT OF THE TOOL DIAMETER ALTERATION -- Kundrák, J.; Sztankovics, I. and Deszpoth, I. .....................................................................................................................
7. COMPUTER AIDED REVERSE ENGINEERING SYSTEM USED FOR CUSTOMIZED PRODUCTS -- Oancea, Gh.; Ivan, N.V. and Pescaru, R ....................
8. A FEW ANALYSIS AND CUSTOMIZATION ISSUES OF A NEW ICIM 3000 SYSTEM: THE CASE OF THE MATERIAL FLOW, ITS COMPLEXITY AND A FEW ISSUES TO IMPROVE -- Delgado Sobrino, D. R. and Koštál, P. ................................ 
9. COMPARISON BETWEEN THE ACCURACY AND EFFICIENCY OF EDMWC AND WJC -- Luca, A.; Popan, I.A.; Balas, M.; Blaga, L. andBâlc, N. ..........................
10. APPLICATION OF AUGMENTED REALITY TECHNOLOGIES IN VIRTUAL MANUFACTURING -- Novak-Marcincin, J. and Novakova-Marcincinova, L. .............
11. CONVERTING 3D POINT CLOUDS TO PLANAR SHAPED SOLIDS -- Drăgoi, M. V. ....................................................................................................................................
12. DESIGN FOR SKIN & SHAPE IN THE PACKAGING INDUSTRY -- Kyratsis, P.; Efkolidis, N.; Manavis, Ath. and Peristeri, S. ..................................................................
13. OPTIMIZATION OF CUTTING TOOL GEOMETRICAL PARAMETERS USING TAGUCHI METHOD -- Lungu, N.; Croitoru, S. M. and Borzan, M. ........................ 
14. THE ASSEMBLY WORKSPACE OF AN INTELLIGENT ASSEMBLY CELL -- Šimúnová, M. and Velíšek, K. ....................................................................................... 
15. RESEARCH ON 3D METAL SCULPTURING BY WATER JET CUTTING VERSUS CNC MACHINING -- Popan I. A.; Cărean A.; Luca A.; Ceclan V. and Bâlc N........ 
16. STUDY ON PRODUCTION OF STEEL/TiB2 COMPOSITE SURFACE LAYER BY FRICTION STIR PROCESSING -- Newishy, M.; Elkousy, M.; Abdel-Rahem, N.; Morsy, M. and Khodir, S......................................................................................................... 
17. STUDY OF THE SURFACE ROUGHNESS OF CARBIDE BLANKS PROCESSED BY GRINDING -- Vulc, S. and Brindasu, P.D. ............................................................. 
18. SOFTWARE POST-PROCESSING OF DATA STRUCTURE OBTAINED FROM MEASURING DEVICE BALLBAR QC20 -- Kuric, I.; Košinár, M. and Tofil, A. ...........
19. RESEARCH ON INFILTRATING BIOCOMPATIBLE FILLERS TO PRODUCE COMPOSITE IMPLANTS -- Mager, V.; Saplontai, V. ; Saplonţai, M.; Leordean, D. and Bâlc, N. ......................................................................................................................... 
20. CREATION OF SOFTWARE FOR THE TRANSFORMATION OF STEP-NC DATA -- Čuboňová, N. ............................................................................................................
21. PHYSICO-MECHANICAL PROPERTIES CHARACTERIZATION OF THE PARTS FROM PA 2200 MANUFACTURED BY SELECTIVE LASER SINTERING TECHNOLOGY -- Borzan C.Ş.; Berce P.; Chezan H.; Sabău E.; Radu S.A. and Ridzon M.
22. ANALYSIS OF VARIABLE CHANGEOVER TIMES IMPACT ON THE REVENUE IN MANUFACTURING PROCESS -- Jardzioch, A. and Skobiej, B. ............................
23. EFFECT OF THE CONSTITUTIVE LAW ON THE PREDICTION OF THE WALL THICKNESS DISTRIBUTION OF SQUARE CUP -- Nicodim, I.; Ciobanu, I. and Banabic, D. ..................................................................................................................................
24. CONTRIBUTIONS REGARDING THE APPLICATION OF FMEA ANALYSIS TO MEASURING WITH A COORDINATE MEASURING MACHINE -- Fulea L.; Bulgaru M.; Borzan M. and Bocanet V. ..............................................................................................
25. RAPID MANUFACTURING METHODS FOR OBTAINING BENT TUBULAR PARTS MADE OF CARBON/EPOXY COMPOSITE -- Bere, P.; Sabău, E.; Hancu, L. and Popescu, A. .....................................................................................................................


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3. ABSTRACT

PATIENT SPECIFIC INSTRUMENTS FOR TOTAL HIP REPLACEMENT SURGERY PDF

Drstvensek, I.; This email address is being protected from spambots. You need JavaScript enabled to view it.

Brajlih, T.; This email address is being protected from spambots. You need JavaScript enabled to view it.

Paulič, M.; This email address is being protected from spambots. You need JavaScript enabled to view it.

Balic, J.; This email address is being protected from spambots. You need JavaScript enabled to view it.

Tomazic, T.; This email address is being protected from spambots. You need JavaScript enabled to view it.

ABSTRACT: Plastic laser sintered parts are nowadays used in many different applications ranging from basic prototypes to demanding end user products as airplane parts, automotive industry products etc. Since Additive Manufacturing methods fit very well into the markets demanding low volume or even bespoke production of parts medicine is one of the main potential users or consumers of individualized plastic products. The use of plastic jigs for endoprosthetic operations has been studied and clinically tested to prove the usefulness of individualized operating equipment. The aim of the modern endoprosthetic is the optimal imitation of the individual human biomechanics. This is achieved by determination of a real 3D-mechanical joint axis and joint kinematics. Preoperative 3D-CT scan of degenerated joint enables a creation of a virtual 3D-joint-model with the determination of optimal and exact joint resection levels. A standardized CT-protocol for joint images with minimum irradiation was created, supported by the specific computer program for trusty segmentation of the CT images, to create a 3D model of the affected joint. Upon this model the planed resection lines were incorporated into an individual joint model with belonging jigs. Personalized joint jigs for Hip endoprosthesis have been developed through the presented study. They enable for accurate bone cuts and preoperative determination of component placement, without modifying the common OPtechnique. The postoperative analysis of endoprosthesis positioning confirmed easier, quicker and more precise procedure.

KEY WORDS: Laser Sintering, Total Hip Replacement, Resection Guides.

 

RESEARCH ON THE DEFORMATIONS CAUSED BY THE MANUFACTURING DEVICES ONTO THE PARTS WITH LOW RIGIDITY PDF

Panc, N.; This email address is being protected from spambots. You need JavaScript enabled to view it.

Vuscan, I.; This email address is being protected from spambots. You need JavaScript enabled to view it.

Balc, N.; This email address is being protected from spambots. You need JavaScript enabled to view it.

ABSTRACT: This paper presents results of our research on how low rigid parts are deformed in manufacturing devices when clamping forces act onto them. The studies are based on the plate parts deformation mathematical model after which the values obtained from the mathematical calculation are compared with those obtained by measurements undertaken in our laboratory. The results of the studies give us a better indication of the influence of fixing errors on the final accuracy of the part.

KEY WORDS: manufacturing devices, dimensional accuracy, clamping force, work piece clamping, elastic deformation.

 

COMPARATIVE RESEARCH OF TWO MACHINING METHODS: LASER BEAM MACHINING AND ABRASIVE WATER JET MACHINING PDF

Legutko, S.; This email address is being protected from spambots. You need JavaScript enabled to view it.

Krolczyk, G.; This email address is being protected from spambots. You need JavaScript enabled to view it.

Wolf, M.; This email address is being protected from spambots. You need JavaScript enabled to view it.

ABSTRACT: The purpose of the work was conducting comparative analysis of two methods of machining by means of concentrated energy beams. The laser beam machining and abrasive water jet machining methods were compared. Analysis of holes drilling was conducted. The surfaces processed with laser beam cutting and abrasive water jet were evaluated in terms of roundness error, surface roughness, aperture width and heat affected zone. NC6 tool steel was the material used during the experiments.

KEY WORDS: laser beam machining, abrasive water jet machining, roundness error, surface roughness, heat affected zone.

 

SOME CHARACTERISTICS ASPECTS REGARDING THE PRECISION MANUFACTURING OF WORM GEARS PDF

Gyenge, Cs.; This email address is being protected from spambots. You need JavaScript enabled to view it.

Pacurar, A.; This email address is being protected from spambots. You need JavaScript enabled to view it.

Pacurar, R.; This email address is being protected from spambots. You need JavaScript enabled to view it.

Radu, S.A.; This email address is being protected from spambots. You need JavaScript enabled to view it.

ABSTRACT: One of the important problems for manufacturing the worm gears is the adequate realization of the worm hobs. The paper presents a method for the accurate definition of the geometrical parameters of the worm hob and the selection of the cutting tool with alternative cutting.

KEY WORDS: gears tools for gear manufacturing, worm hob, CNC.

 

CHIP REMOVAL CHARACTERISTICS IN ROTATIONAL TURNING AND THE EFFECT OF THE TOOL DIAMETER ALTERATION PDF

Kundrák, J.; This email address is being protected from spambots. You need JavaScript enabled to view it.

Sztankovics, I.; This email address is being protected from spambots. You need JavaScript enabled to view it.

Deszpoth, I.; This email address is being protected from spambots. You need JavaScript enabled to view it.

ABSTRACT: The cutting procedures applied in finishing operations differ from each other in the characteristics of the chip-removal and the quality (or integrity) of the machined surface. Furthermore, the values of efficiency and the expenditure are varying as well. In this paper we show some of the characteristic properties of material removal and the topography of the machined surface in rotational turning. In addition, we show the alteration effect of the tool diameter on the axial feed of the tool and the roughness parameters of the surface.

KEY WORDS: rotational turning, chip removal, hard turning, complex edge geometry.

 

COMPUTER AIDED REVERSE ENGINEERING SYSTEM USED FOR CUSTOMIZED PRODUCTS PDF

Oancea, Gh.; This email address is being protected from spambots. You need JavaScript enabled to view it.

Ivan, N.V.; This email address is being protected from spambots. You need JavaScript enabled to view it.

Pescaru, R.; This email address is being protected from spambots. You need JavaScript enabled to view it.

ABSTRACT: Computer Aided Reverse Engineering (CARE) system is used for products in the design or redesign process, when technical documentation is not available. Any CARE system uses different types of software tools, technologies and equipment which depend on the product shape. The paper presents a Computer Aided Reverse Engineering system configured at Manufacturing Engineering Department from Transilvania University of Brasov, and a few case studies developed in the system for industrial and non industrial products. The system consists of 3D scanners used for parts digitization, software systems for point clouds handling, customized software tools for automation part recognition, CAD systems used for parts designing or redesigning, and equipment with associated software tools for part manufacturing.

KEY WORDS: Computer Aided Reverse Engineering, Customized Products, Point Clouds, Software Systems, Part Manufacturing.

 

A FEW ANALYSIS AND CUSTOMIZATION ISSUES OF A NEW ICIM 3000 SYSTEM: THE CASE OF THE MATERIAL FLOW, ITS COMPLEXITY AND A FEW ISSUES TO IMPROVE PDF

Delgado Sobrino, D. R.; This email address is being protected from spambots. You need JavaScript enabled to view it.

Košťál, P.; This email address is being protected from spambots. You need JavaScript enabled to view it.

ABSTRACT: Due to the scope of new projects and the need of turning the existing flexible ideas into more autonomous and intelligent ones, i.e.: moving toward a more intelligent, somehow real-life oriented but at the same time educationally useful manufacturing, the present paper offers a step more into the analysis and a few customization issues of a new iCIM 3000 system at an academic-research oriented Institution. In this process, special emphasis in made on the material flow problem. For this, besides offering a description and analysis of the system and its main parts, also some tips on how to define other possible alternative material flow scenarios and a partial analysis of the combinatorial nature of the problem are offered as well; all this is done with the intentions of relating it with the use of simulation tools. For a better comprehension, the previous elements are supported by a few figures and expressions which would help obtaining necessary data. Such data and others will be used in the future, when simulating the scenarios in the search of the best material flow configurations.

KEY WORDS: Flexible/Intelligent assembly/disassembly cell (F/IA/DC), Flexible/Intelligent Manufacturing Systems/Cell (F/IMS/C), Material Flow Analysis/Optimization/Combinations/Design (MFA/O/C/D).

 

COMPARISON BETWEEN THE ACCURACY AND EFFICIENCY OF EDMWC AND WJC PDF

Luca, A.; This email address is being protected from spambots. You need JavaScript enabled to view it.

Popan, I.A.; This email address is being protected from spambots. You need JavaScript enabled to view it.

Balas, M.; This email address is being protected from spambots. You need JavaScript enabled to view it.

Blaga, L.; This email address is being protected from spambots. You need JavaScript enabled to view it.

Bâlc, N.; This email address is being protected from spambots. You need JavaScript enabled to view it.

ABSTRACT: The paper presents a comparison between two different cutting technologies, Water Jet Cutting (WJC) and EDM Wire Cutting (EDMWC). Water jet cutting technology is a unique process that is able to cut almost all materials. Within this experimental study the authors have made a comparison between WJC and EDMWC concerning the cutting surface accuracy. To determine the advantages and disadvantages of these technologies an experimental investigation has been made. In this study were analyzed some aspects of the parts, such as: dimensional accuracy, surface roughness and surface characteristics. EDMWC and WJC are two technologies that provide solutions for manufacturing parts and developing new products at lower cost. We cannot say which of the two technologies is better, but each one is suitable for a diversified manufacturing environment.

KEY WORDS: EDM wire cutting, water jet cutting, accuracy.

 

APPLICATION OF AUGMENTED REALITY TECHNOLOGIES IN VIRTUAL MANUFACTURING PDF

Novak-Marcincin, J.; This email address is being protected from spambots. You need JavaScript enabled to view it.

Novakova-Marcincinova, L.; This email address is being protected from spambots. You need JavaScript enabled to view it. Abstract:

ABSTRACT: Virtual engineering is currently approached in various ways. Because virtual engineering is an emerging technology, its terminology and definition are not completely established. In manufacturing, the major component of virtual engineering is virtual manufacturing. Virtual manufacturing is defined as an integrated, synthetic manufacturing environment exercised to enhance all levels of decision and control. Augmented reality system generates a complex view where the virtual parts are covered by real elements in the basic working place for the user. It is a mutual combination of the real scene viewed by the user and a virtual scene generated by the computer logical core that augments the scene. Thanks to its possibilities if finds the utilization in many industrial spheres.

KEY WORDS: virtual engineering, virtual manufacturing, virtual reality, augmented reality.

 

CONVERTING 3D POINT CLOUDS TO PLANAR SHAPED SOLIDS PDF

Drăgoi, M. V.; This email address is being protected from spambots. You need JavaScript enabled to view it.

ABSTRACT: 3D point clouds can be easily turned to meshed surfaces or solids, but still they have to be processed to be useable as 3D models for Reverse Engineering. A main drawback of such a conversion is that the file the part is saved to is very big, even if the shape is in fact a simple one. Finding in the point cloud planar shapes, which could be converted to primitives, is very useful. The paper presents an algorithm and some pieces of software designed in VisualLISP for AutoCAD that aid user in converting point clouds in solid primitives if the original shape of the part allows that.

KEY WORDS: Reverse engineering, 3D scan, Points cloud, Planar shaped parts, Surface fitting, CAD/CAM.

 

DESIGN FOR SKIN & SHAPE IN THE PACKAGING INDUSTRY PDF

Kyratsis, P.; This email address is being protected from spambots. You need JavaScript enabled to view it.

Efkolidis, N.; This email address is being protected from spambots. You need JavaScript enabled to view it.

Manavis, Ath.; This email address is being protected from spambots. You need JavaScript enabled to view it.

Peristeri, S.; This email address is being protected from spambots. You need JavaScript enabled to view it.

ABSTRACT: Over the years a number of Design for ‘X’ methodologies have been presented by a variety of researchers. The main idea behind these proposals was to stress one particular design issue over the others. Although all issues should be considered simultaneously, while designing a new product, sometimes there is a need to pay more attention on only one of them. Traditionally, the researchers dealt with the design of products and manufacturing and/or assembly were the first issues brought into attention related to the Design for Manufacturing and Assembly methodologies. The area of modern packaging design is traditionally treated in a similar manner with product design. Although this is not a mistake, there is a gap in creating a novel design methodology exclusively for the packaging industry. The proposed Design for Skin and Shape (Df S&S) methodology is stressing the idea that the user of a product should understand clearly, which product is held in the proposed packaging by the packaging design itself. A series of case studies is presented in order to establish the advantages of the proposed methodology.

KEY WORDS: Design for X, Design for Skin & Shape, packaging design.

 

OPTIMIZATION OF CUTTING TOOL GEOMETRICAL PARAMETERS USING TAGUCHI METHOD PDF

Lungu, N.; This email address is being protected from spambots. You need JavaScript enabled to view it.

Croitoru, S. M.; This email address is being protected from spambots. You need JavaScript enabled to view it.

Borzan, M.; This email address is being protected from spambots. You need JavaScript enabled to view it.

ABSTRACT: The study developed in this paper presents the finite element analysis of the influence of cutting tool geometrical parameters: nose radius, rake angle and clearance angle – on the some evaluation indicators of the machining process, namely: cutting forces, temperatures and thermal deformations of the tool. To optimize the geometric parameters of the cutting tool was used statistical method of signal – noise ratio.

KEY WORDS: cutting tool optimization, Taguchi method, finite element analysis, machining process.

 

THE ASSEMBLY WORKSPACE OF AN INTELLIGENT ASSEMBLY CELL PDF

Šimúnová, M.; This email address is being protected from spambots. You need JavaScript enabled to view it.

Velíšek, K.; This email address is being protected from spambots. You need JavaScript enabled to view it.

ABSTRACT: This contribution is focused on automation in the robotics. Automation is in present very important part of the science and life as well. In this short abbreviate is necessary to say, that the main issue of this work was the change of the assembly cell to intelligent assembly cell. The aim of this article is to get a new knowledge about a creating of intelligent assembly cell .There are presented the hardware accessories which are used in the intelligent assembly cell at the Institute of Production Systems and Applied Mechanics in this contribution. There are more subsystems in this intelligent assembly cell. We will focus on assembly workspace of this system. In this case it has been a description of the structure of an external robot allocated in assembly workspace, main its gripper. Designed gripper works as part of automated flexible assembly system but due to planned algorithm and sensory devices it is rarefied to the intelligent assembly system. In the other case it has been also the used sensory devices exhausted because they are the no separated parts of the intelligent manner of this intelligent assembly cell. This sensory equipment is necessary to apply to this subsystem, to the workspace, an external robot and the fixture as well.

KEY WORDS: intelligent assembly cell robot, sensory devices, exchange gripper, assemblyy.

 

RESEARCH ON 3D METAL SCULPTURING BY WATER JET CUTTING VERSUS CNC MACHINING PDF

Popan I. A.; This email address is being protected from spambots. You need JavaScript enabled to view it.

Cărean A.; This email address is being protected from spambots. You need JavaScript enabled to view it.

Luca A.; This email address is being protected from spambots. You need JavaScript enabled to view it.

Ceclan V.; This email address is being protected from spambots. You need JavaScript enabled to view it.

Bâlc N.; This email address is being protected from spambots. You need JavaScript enabled to view it.

ABSTRACT: Abrasive Water Jet (AWJ) has various distinct advantages over the other technologies, such as no thermal distortion, high machining versatility and small cutting forces, and has been proven to be an efficient technology for processing various engineering materials. Abrasive Water Jet technology is used in a routine manner in manufacturing industry to cut materials that are difficult to cut by other methods. AWJ technology is in a continuous development, using an abrasive jet, different parts can be milled. Milling parts using water jet cutting equipment can save time and money, eliminating an extra operation. This paper presents a comparison between classical milling and abrasive water jet milling.

KEY WORDS: abrasive water jet, CNC manufacturing, milling.

 

STUDY ON PRODUCTION OF STEEL/TiB2 COMPOSITE SURFACE LAYER BY FRICTION STIR PROCESSING PDF

Newishy, M.; This email address is being protected from spambots. You need JavaScript enabled to view it.

Elkousy, M.; This email address is being protected from spambots. You need JavaScript enabled to view it.

Abdel-Rahem, N.; This email address is being protected from spambots. You need JavaScript enabled to view it.

Morsy, M.; This email address is being protected from spambots. You need JavaScript enabled to view it.

Khodir, S.; This email address is being protected from spambots. You need JavaScript enabled to view it.

ABSTRACT: An investigation was carried out to evaluate the feasibility of Friction Stir powder Processing (FSPP) to produce particle reinforced Metal Matrix Composite (MMC) materials on JISG3141 SPCC steel sheets and 2 μm size TiB2 powder using WC-Co tools. Friction stir processed materials to produce MMC showed localized microstructural modification in addition to the homogeneous ceramic particles distribution results in a gradual improvement in hardness and wear. Metallographic examinations using optical and SEM observation showed a considerable influence of the FSP parameters on the soundness of nugget and the distribution of the TiB2 ceramic particles. Wear resistance and micro-hardness investigations were described. Tool wear and damage was very significant, proving that TIB2- Co tools are not the most suitable tools for steel processing.

KEY WORDS: Friction Stir Processing; Microstructures; Surface Modification, Metal Matrix Composites. TiB2

 

STUDY OF THE SURFACE ROUGHNESS OF CARBIDE BLANKS PROCESSED BY GRINDING PDF

Vulc, S.; This email address is being protected from spambots. You need JavaScript enabled to view it.

Brindasu, P.D.; This email address is being protected from spambots. You need JavaScript enabled to view it.

ABSTRACT: This paper presents a study of surface roughness carbide blanks DK460UF (91%WC and 9% Co). The samples tungsten carbides were machined with diamond grinding wheels with different grain size, with different cutting regimes, using cutting medium. The aspect of machined surfaces were examined by scanning electron microscope (SEM). The results of experimental studies have shown that machined surfaces of tungsten carbide by grinding have small roughness if it uses grinding wheel with little grit.

KEY WORDS: tungsten carbide, grinding, roughness, cutting regime.

 

SOFTWARE POST-PROCESSING OF DATA STRUCTURE OBTAINED FROM MEASURING DEVICE BALLBAR QC20 PDF

Kuric, I.; This email address is being protected from spambots. You need JavaScript enabled to view it.

Košinár, M.; This email address is being protected from spambots. You need JavaScript enabled to view it.

Tofil, A.; This email address is being protected from spambots. You need JavaScript enabled to view it.

ABSTRACT: The paper presents the innovative method of data transformation from the measurement device Ballbar QC20W by specialized software. Program for data transform was created in Visual Basic.NET and it uses Fourier transformation for spectral analysis of measured profile. Paper deals with the measuring method of CNC machine tools using Ballbar QC20W. There is an influence between qualitative parameters of machine tools and qualitative parameters of products (tolerances, roughness, etc.). It is very important to hold the stability of qualitative parameters of products as a key factor of production quality. Accuracy evaluation of machine tools and make prediction of its future accuracy is of high interest.

KEY WORDS: Ballbar QC20-W, geometric accuracy, data transformation, direct measurement method.

RESEARCH ON INFILTRATING BIOCOMPATIBLE FILLERS TO PRODUCE COMPOSITE IMPLANTS PDF

Mager, V.; This email address is being protected from spambots. You need JavaScript enabled to view it.

Saplontai, V. ; This email address is being protected from spambots. You need JavaScript enabled to view it.

Saplonţai, M.; This email address is being protected from spambots. You need JavaScript enabled to view it.

Leordean, D.; This email address is being protected from spambots. You need JavaScript enabled to view it.

Bâlc, N.; This email address is being protected from spambots. You need JavaScript enabled to view it.

ABSTRACT: This study evaluates the manufacturability of biocompatible composites and the adherence between the corresponding components. The composite materials consist of a metallic scaffold manufactured by Selective Laser Melting ( SLM ) from pure Titanium powder in which liquid biocompatible bone void fillers were injected. Two different types of materials were used : one based on hidroxiapatite, polymer and organic glass and the other on beta Tricalcium Fosfate and polymer. After solidification, a very good adherence between the titanium struts and the two biocompatible materials was observed.

KEY WORDS: lattice structure, bone void filler, selective laser melting, titanium, biocompatibility.

 

CREATION OF SOFTWARE FOR THE TRANSFORMATION OF STEP-NC DATA PDF

Čuboňová, N.; This email address is being protected from spambots. You need JavaScript enabled to view it.

ABSTRACT: Standard for the Exchange of Product data compliant Numerical Control (STEP-NC) is a new model of data transfer between CAD/CAM systems and CNC machines. The paper is focused on explaining of design and creation of software for transformation of STEP-NC data. Created TERMINAL STEP NC software processes STEP-NC control program and sends motion control commands based on the designed communication protocol to the lathe control unit. Utilization of this software verifies the possibility of using ISO 14649 as a new model for data exchange between CAD/CAM systems and CNC machines and also the possibility of implementing a new standard into the older types of CNC machines.

KEY WORDS: STEP-NC, CNC machine, transformation, data, software.

 

PHYSICO-MECHANICAL PROPERTIES CHARACTERIZATION OF THE PARTS FROM PA 2200 MANUFACTURED BY SELECTIVE LASER SINTERING TECHNOLOGY PDF

Borzan C.Ş.; This email address is being protected from spambots. You need JavaScript enabled to view it.

Berce P.; This email address is being protected from spambots. You need JavaScript enabled to view it.

Chezan H.; This email address is being protected from spambots. You need JavaScript enabled to view it.

Sabău E.; This email address is being protected from spambots. You need JavaScript enabled to view it.

Radu S.A.; This email address is being protected from spambots. You need JavaScript enabled to view it.

Ridzon M.; This email address is being protected from spambots. You need JavaScript enabled to view it.

ABSTRACT: This paper presents researches in the field of biocompatible materials manufactured by Selective Laser Sintering method (SLS). In the last years, the field of biocompatible materials has developed increasingly more because of the advantages they offers. It was made processability tests and physical-mechanical properties of the parts manufactured by Selective Laser Sintering from biocompatible powder PA 2200.

KEY WORDS: SLS, biocompatible material, PA 2200, processability tests.

 

ANALYSIS OF VARIABLE CHANGEOVER TIMES IMPACT ON THE REVENUE IN MANUFACTURING PROCESS PDF

Jardzioch, A.; This email address is being protected from spambots. You need JavaScript enabled to view it.

Skobiej, B.; This email address is being protected from spambots. You need JavaScript enabled to view it.

ABSTRACT: This paper presents a comparison of two manufacturing models performing prototype and small batch production. The first model considers variable changeover times which depend on a current tooling code of a machine and a tooling code required by a job. In the second model, changeover times are not taken into consideration. A non-classical evolutionary approach based on a genetic algorithm is proposed to schedule production jobs in both models. On the basis of the data obtained from the manufacturing company, 10 and 100 jobs were analyzed. The analysis made it possible to determine the impact of changeover times and various scheduling methods (Genetic Algorithm, Descending Delay Penalty, Earliest Due Date, Time Reserve, Shortest Processing Time, Longest Processing Time) on potential revenue.

KEY WORDS: changeover times, prototype production, small batch production, revenue, job scheduling.

 

EFFECT OF THE CONSTITUTIVE LAW ON THE PREDICTION OF THE WALL THICKNESS DISTRIBUTION OF SQUARE CUP PDF

Nicodim, I.; This email address is being protected from spambots. You need JavaScript enabled to view it.

Ciobanu, I.; This email address is being protected from spambots. You need JavaScript enabled to view it.

Banabic, D.; This email address is being protected from spambots. You need JavaScript enabled to view it.

ABSTRACT: The output of the simulation is very sensitive to the constitutive equations that describing the anisotropic behaviour of the sheet metal. From this point of view, the mathematical formulation of the yield criterion as well as the number of the mechanical parameters used in the identification procedure has the most significant influence. The paper presents a comparative analysis referring to the quality of the wall thickness distribution of the square cup predicted by AutoForm finite element program if the anisotropy is described by one of the following yield criteria: Hill48, Barlat89 and BBC2005 with 6 and 8 parameters. The distribution of the thickness is studied along 0o, 45o and 90o from the rolling direction. The predictions are compared with the experimental data for AA6016-T4 aluminium alloy with 1 mm thickness.

KEY WORDS: Mechanical parameters, Yield criterion, FE simulation.

 

CONTRIBUTIONS REGARDING THE APPLICATION OF FMEA ANALYSIS TO MEASURING WITH A COORDINATE MEASURING MACHINE PDF

Fulea L.; This email address is being protected from spambots. You need JavaScript enabled to view it.

Bulgaru M.; This email address is being protected from spambots. You need JavaScript enabled to view it.

Borzan M.; This email address is being protected from spambots. You need JavaScript enabled to view it.

Bocanet V.; This email address is being protected from spambots. You need JavaScript enabled to view it.

ABSTRACT: The current paper presents the research results of applying the FMEA method to the process of measuring with Coordinate Measuring Machines. The research focused on the risk indicators (A, B and E) used in the FMEA method. With the participative method of brainstorming information was gathered regarding the errors that can occur in the measurement process, their causes and their effects, as well as preventive and error discovery methods. The information was then processed by means of different quality instruments (cause-effect diagram, flow diagram, matrix diagram) resulting in a ranking of risk coefficients used in the FMEA method.

KEY WORDS: FMEA method, cause-effect diagram, flow diagram, measurement errors.

 

RAPID MANUFACTURING METHODS FOR OBTAINING BENT TUBULAR PARTS MADE OF CARBON/EPOXY COMPOSITE PDF

Bere, P.; This email address is being protected from spambots. You need JavaScript enabled to view it.

Sabău, E.; This email address is being protected from spambots. You need JavaScript enabled to view it.

Hancu, L.; This email address is being protected from spambots. You need JavaScript enabled to view it.

Popescu, A.; This email address is being protected from spambots. You need JavaScript enabled to view it.

ABSTRACT: This paper presents a research regarding a new method to obtain bent tubular parts made of reinforced composite materials. Using modern rapid manufacturing methods and based on competitive prototyping, this paper presents a comparative study of two modern mould manufacturing methods. This paper is also presenting an innovative modern technology for manufacturing bent tubular parts with a variable section made of carbon/epoxy composite materials.

KEY WORDS: tubes, composite materials, Rapid Prototyping, CAD, CAM.