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REFERENCE LINKING PLATFORM OF KOREA S&T JOURNALS
> Journal Vol & Issue
Transactions of Materials Processing
Journal Basic Information
Journal DOI :
The Korean Society for Technology of Plasticity
Editor in Chief :
Volume & Issues
Volume 15, Issue 9 - Dec 2006
Volume 15, Issue 8 - Nov 2006
Volume 15, Issue 7 - Oct 2006
Volume 15, Issue 6 - Sep 2006
Volume 15, Issue 5 - Aug 2006
Volume 15, Issue 4 - Jun 2006
Volume 15, Issue 3 - Apr 2006
Volume 15, Issue 2 - Mar 2006
Volume 15, Issue 1 - Feb 2006
Selecting the target year
An Application of CAE in the Optimization of Runner Size in Injection Molding
Kim, June-Min ; Lyu, Min-Young ;
Transactions of Materials Processing, volume 15, issue 5, 2006, Pages 347~353
DOI : 10.5228/KSPP.2006.15.5.347
The delivery system such as sprue, runner and gate is a waste of resin in injection molding operation. In this study the reduction of runner size has been investigated using injection molding CAE softwares, Moldflow and Moldex3D, and commercial CFD Softwares, Fluent and Polyflow. To verify the computational results experiment was performed. There were three considerations in deciding optimal runner size in this study: minimum pressure at the gate that makes resin fully filled in the cavity, minimum runner size that compensates shrinkage of resin in the cavity, and frozen layer thickness formed in the runner during injection. Through the computer simulations the optimal runner size that satisfies those three considerations has been decided. Although the computational results among the softwares were slightly different, it was enough to predict the optimal runner size. The previous runner diameter was 8 mm and predicted optimal size was 5 mm. This was verified by injection molding experiment. Thus, the way of CAE application in deciding optimal runner size adapted in this study would be appropriated.
Analysis of Cylindrical Tube Forming Process Using Polyurethane
La, W,K ; Lee, H.W ; Choi, S. ; Lim, S.J ; Woo, C.S. ; Lee, G.A ;
Transactions of Materials Processing, volume 15, issue 5, 2006, Pages 354~359
DOI : 10.5228/KSPP.2006.15.5.354
The elastomer forming process was employed for many operations which included piercing, sheet metal forming and tube metal forming process. This paper presents cylindrical tube forming process using rubber material such as polyurethane. For elastomer forming process, tensile tests at room temperature were performed to obtain the material properties of polyurethane and tube. In particular, biaxial tensile test were carried out to obtain the coefficient of strain energy function of the rubber material. Finite element analyses were also carried out to investigate the forming load and formability of tube. It was compared with the experimental results about the forming load and the formability of tube. From these results, it was investigated a forming process to decrease the forming load for elastomer forming process.
Mechanical Properties of Carbon Nanotube/Cu Nanocomposites Produced by Powder Equal Channel Angular Pressing
Yoon, Seung-Chae ; Jeong, Young-Gi ; Kim, Hyoung-Seop ;
Transactions of Materials Processing, volume 15, issue 5, 2006, Pages 360~365
DOI : 10.5228/KSPP.2006.15.5.360
Carbon nanotubes (CNTs) have been the subject of intensive studies for applications in the fields of nano technologies in recent years due to their superior mechanical, electric, optical and electronic properties. Because of their exceptionally small diameters (
) as well as their high Young's modulus (
), tensile strength (
) and high elongation (10-30%) in addition to a high chemical stability, CNTs are attractive reinforcement materials for light weight and high strength metal matrix composites. Although extensive researches have been performed on the electrical, mechanical and functional properties of CNTs, there are not many successful results on the mechanical properties of CNT dispersed nanocomposites. In this paper, we applied equal channel angular pressing for consolidation of CNT/Cu powder mixtures. We also investigated the hardness and microstructures of CNT/Cu nanocomposites used experimental for metal matrix composites.
Effect of Coating Time on the Property of TiN-Coated Layer of High Speed Steel by Arc Ion Plating
Kim, H.J. ; Joun, M.S. ;
Transactions of Materials Processing, volume 15, issue 5, 2006, Pages 366~372
DOI : 10.5228/KSPP.2006.15.5.366
The effect of coating time in arc ion plating on surface properties of the TiN-coated high speed steel(SKH51) is presented in this paper. Surface roughness, micro-hardness, coated thickness, atomic distribution of TiN and adhesion strength are measured for various coating times. It has been shown that the coating time has a deep influence on the micro-hardness, the coated thickness, the atomic distribution of Ti and the adhesion strength of the SKH51 steels but that it has little influence on the surface roughness.
Development of a Double-Action Link-Type Hydraulic Die Set for Enclosed Die Forging
Choi, S.H. ; Jun, B.Y. ; Lee, M.C. ; Park, R.H. ; Eom, J.G. ; Joun, M.S. ;
Transactions of Materials Processing, volume 15, issue 5, 2006, Pages 373~381
DOI : 10.5228/KSPP.2006.15.5.373
The key technologies necessary to develop and utilize a double-action link-type hydraulic die set for the enclosed die forging are presented in this paper. Various die sets for the enclosed die forging are investigated and the technologies necessary to develop and to utilize a double-action link-type hydraulic die set are introduced in detail with emphasis on the mechanism of the die set and its kinematical behaviors, the force transmission mechanism, the criterion on the enclosed die forging and its application, the forming load prediction and the stress distribution of the link. A double-action link-type hydraulic die set is developed and it is applied to the enclosed die forging of a bevel gear.
Preform Effect on the Plastic Deformation Behavior of Workpieces in Equal Channel Angular Pressing
Yoon, Seung-Chae ; Seo, Min-Hong ; Kim, Hyoung-Seop ;
Transactions of Materials Processing, volume 15, issue 5, 2006, Pages 382~386
DOI : 10.5228/KSPP.2006.15.5.382
Preform design is an effective means of achieving the homogeneous deformation of workpiece materials and decreased load in metal forming. However, this approach has not been applied to equal channel angula. pressing (ECAP). In this paper, plastic deformation behavior of workpieces having four different preform shapes during ECAP was investigated using finite element analyses. The results indicated that a preform design of the workpiece head has a beneficial effect on homogeneous deformation, reducing the maximum pressing load at the initial stage and eliminating folding defects at strain concentration points.
Forming Analysis of Automotive Fender Panel Considering Die Deformation
Song, M.S. ; Keum, Y.T. ;
Transactions of Materials Processing, volume 15, issue 5, 2006, Pages 387~394
DOI : 10.5228/KSPP.2006.15.5.387
In order to see the effect of die deformation on the forming analysis of sheet metals, the draw-ins, strains, and spring-backs of an automotive fender panels are numerically simulated by considering the die deformation found by the simultaneous structural analysis of press and dies. By coupling the forming analysis and the structural analysis, the die deformation is simultaneously taken into account in the forming process. Furthermore, for the consideration of load difference transferred among the upper die, punch, and blank holder due to the changes in sheet thickness, the gap elements are employed instead of the blank sheet in the structural analysis. The numerical simulation results of an automotive finder draw panel are compared with the measurements. The comparison of the forming and spring-back analysis results between the rigid die and the deformed die shows that the consideration of tool deformation can predict more accurately the forming and spring-back of sheet metals.
Dynamics Simulation of Solid Particles in Compression Deformation of Rheology Material
Lee, C.S. ; Kang, C.G. ;
Transactions of Materials Processing, volume 15, issue 5, 2006, Pages 395~401
DOI : 10.5228/KSPP.2006.15.5.395
It is reported that semi-solid forming process takes many advantages over the conventional forming process, such as a long die life, good mechanical properties and energy saves. It is important to predict the deformation behavior for optimization of the forging process with semi-solid materials and to control liquid segregation for mechanical properties of materials. But rheology material has thixotropic, pseudo-plastic and shear-thinning characteristics. So, it is difficult for a numerical simulation of the rheology process to be performed because complicated processes such as the filling to include the state of the free surface and solidification in the phase transformation must be considered. General plastic or fluid dynamic analysis is not suitable for the analysis of the rheology material behavior. Recently, molecular dynamics is used for the behavior analysis of the rheology material and turned out to be suitable among several methods. In this study, molecular dynamics simulation was performed for the control of liquid segregation, forming velocity, and viscosity in compression experiment as a part of study on the analysis of rheology forming process.