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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
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Volume & Issues
Volume 4, Issue 4 - Dec 1995
Volume 4, Issue 3 - Sep 1995
Volume 4, Issue 2 - Jun 1995
Volume 4, Issue 1 - Mar 1995
Selecting the target year
드로오비드에 관한 국내외 연구 동향
Transactions of Materials Processing, volume 4, issue 4, 1995, Pages 295~301
Blank Design for the General Shaped Deep Drawing Products by F.E.M
Kim, Sang-Do ; Park, Min-Ho ; Seo, Dae-Gyo ;
Transactions of Materials Processing, volume 4, issue 4, 1995, Pages 302~321
A method of determining an optimum blank shape for the non-circular deep drawing process is investigated. The rigid-plastic finite element method is introduced and the computer program code is developed. The ideal shape of a drawn cup with uniform wall height is assumed and metal flow is traced back-ward step by step to predict an initial blank shape of the ideal cup. For examples of the non-circular deep drawing products, three cases of drawn cup with quadrilateral punch shape are considered and optimum blank shapes for each case are proposed and compared with experimental results.
A study on Development of Expert System for Process and Die design of Hot Extrusion through Square Dies
Lee, C.M. ; Lee, S.H. ; Yang, D.Y. ;
Transactions of Materials Processing, volume 4, issue 4, 1995, Pages 322~334
This study presents development of an expert system for process and die design of hot extrusion through square dies. The design of extrusion dies is still an art rathere than a science with increasing complexity of shape and thinness of section. Therefore, most of the die design is still dependent on personal judgement, intuition and experience. The objective of this study is to develop an expert system which includes a rule base system extracted from literatures and experts in the extrusion industry. The system also includes finite element simulation program. The developed system is effectively used to design two types of processes and dies with lead time and trial extrusion.
Experiment of Turbine Blade Hot Forging Process using Model Material and SLA Prototype Die Set
Park, K. ; Shin, M.C. ; Yang, D.Y. ; Cho, J.R. ; Kim, J.S. ;
Transactions of Materials Processing, volume 4, issue 4, 1995, Pages 335~344
In this paper, an experimental study of a hot forging process is carried out using plasticine and the die set manufactured with the aid of rapid prototyping. In order to manufacture the die set, Stereolithography Apparatus(SLA) which is most widely used rapid prototyping system is introduced. Turbine blade forging is performed using palsticine and the SLA prototype die set. Through the experiment, it has been shown that SLA prototype is suitable to the die set for the plasticine workpiece, and the formability and the forming load of turbine blade forging are predicted.
Comparison of Warm Deep Drawability of Stainless Steel Sheet Between Crank Press and Hydraulic Press
Kim, Jong-Ho ; Choi, Chi-Soo ; Na, Kyoung-Hoan ;
Transactions of Materials Processing, volume 4, issue 4, 1995, Pages 345~352
Warm deep drawing for optimum forming conditions to give the maximum drawing depth is investigated and compared with the results from experiments performed at room temperature. Experiments which draw square cups of STS 304 stainless steel sheet under the constant lubrication condition of teflon film are made both in a crank and hydraulic press for two kinds of specimens. The maximum drawing depth at warm forming condition reaches 1.4 times the drawing depth at room temperature in a crank press, whereas 1.6 times in a hydraulic press, and also more uniform distribution of thickness in case of warm deep drawn cup is observed. The effects of other factors on formability, such as forming temperature, speed of press and cooling of punch are examined and discussed.
Inhomogeneous Rolling Texture of Multilayered Aluminum Sheet
Choi, Chang-Hee ; Hong, Seung-Hyun ; Kwon, Jae-Wook ; Oh, Kyu-Hwan ; Lee, Dong-Nyung ;
Transactions of Materials Processing, volume 4, issue 4, 1995, Pages 353~364
An inhomogeneous rolling texture of high purity aluminum has been observed by a multilayered rolling. The shear texture of (100) component developed in the surface layer, and the copper type rolling texture developed in the middle and center layers. The through-thickness texture variation has been calculated by the full-constraint Taylor model combined with FEM. The calculated results are in good agreement with the measured data.
Analysis of Blade Forming using an Elasto-Plastic Finite Element Method with Directional Reduced Integration
Choi, Tae-Hoon ; Huh, Hoon ;
Transactions of Materials Processing, volume 4, issue 4, 1995, Pages 365~374
Numerical simulation of blade forming is carried out as stretch forming by an elasto-plastic finite element method. The method adopts a Lagrangian formulation, which incorporates large deformation and rotation, with a penalty method to treat the contact boundary condition. Numerical integration is done with a directional reduced integration scheme to avoid shear locking. The numerical results demonstrates various final shapes of blades which depend on the variation of the stretching force. The strain distributions in deformed blades are also obtained with the variation of the stretching force.
A Numerical Analysis of H Shape Rolling
Park, Jong-Jin ; Jeong, Nak-Joon ; Kim, Jae-Joo ;
Transactions of Materials Processing, volume 4, issue 4, 1995, Pages 375~389
In H shape rolling, accurate predictions of deformation and temperature distribution in a billet are quite important because they are the main factors in determining roll calibers and roll pass schedules. Many researches have been performed to achieve the predictions, but most of them are limited to single pass or isothermal assumptions. In the present investigation, it is attempted to develop a method to predict the deformation and temperature distributions which is applicable to a complete rolling process that usually consists of several rollings under different rolls for a period of time. The method works by coupling two analyses : one is an approximate analysis for temperature distribution prediction and the other is the slab-FEM hybrid analysis for deformation prediction. The method is applied to analyze a "H" shape rolling process consisting of nine passes under four different rolls. In the present paper, basic ideas of the method are presented. Also, shapes of cross sections, strain and temperature distributions, roll separating force and roll torque predicted by the method are discussed.
An Upper Bound Analysis of the Final-Stage Square Die Extrusion of the Non-Axisymmetric Bars
Kim, Dong-Kwon ; Bae, Won-Byong ; Kim, Young-Ho ;
Transactions of Materials Processing, volume 4, issue 4, 1995, Pages 390~397
A simple kinematically admissible velocity field is proposed to determine the final-stage extrusion load and the average extruded length in the square-die forward extrusion of non-axisymmetric bars from circular billets. The proposed velocity field is applied to the square-die extrusion of trochoidal gear-shaped bars and rectangular-shaped bars. The profile function of a rectangle is approximated by using a Fourier series. Experiments have been carried out with hard solder billets at room temperature. The theoretical predictions of the extrusion load are in good agreements with the experimental results and there is generally reasonable agreements in average extruded length between theory and experiment.
Wear Properties of the Alumina Short Fiber Reinforced Tin-Bronze Matrix Composites manufactured by Hot Pressing
Choi, Jun-Ho ; Huh, Moo-Young ;
Transactions of Materials Processing, volume 4, issue 4, 1995, Pages 398~409
The wear properties of the alumina short fiber reinforced tin-bronze matrix composites manufactured by hot pressing was studied at the room temperature and
The wear loss of various specimens having different constituent and different density was examined by a pin-on-disc type wear testing machine. The results were discussed by the observation of the worn surface morphology and the analysis of the composition on the worn surfaces. Since the reinforced effect of the alumina fiber on the wear resistance was dependent on the strength of alloy matrix, the pressureless sintered composites having a lower matrix strength showed a marked increase in wear resistance by the fiber reinforcement. As the wear condition became severe, the fiber reinforcement was more effective. The delamination on the wear surface was observed in the pressureless sintered specimens having pores which are related to the initiation and the propagation of cracks. However, the wear mechanism acting on a big failure area was not found on the wear surfaces of the hot pressed specimens having a few pores.