Transactions of Materials Processing (소성∙가공)

The Korean Society for Technology of Plasticity and materials processing (한국소성∙가공학회)
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Process Map for Improving the Dimensional Accuracy in the Multi-Stage Drawing Process of Rectangular Bar with Various Aspect Ratio

다양한 종횡비의 직사각바 다단 인발공정에서 치수정도 향상을 위한 프로세스 맵

  • 고필성 (부산대학교 기계공학부 정밀가공시스템전공) ;
  • 김정훈 (부산대학교 기계공학부 정밀가공시스템전공) ;
  • 김병민
  • Received : 2018.01.29
  • Accepted : 2018.05.10
  • Published : 2018.06.01
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Abstract

In the rectangular bar multi-stage drawing process, the cross-section dimensional accuracy of the rectangular bar varies depending on the aspect ratio and process conditions. It is very important to predict the dimensional error of the cross-section occurring in the multi-stage drawing process according to the aspect ratio of the rectangular bar and the half die angle of each pass. In this study, a process map for improving the dimensional accuracy according to the aspect ratio was derived in the drawing process of a rectangular bar. FE-simulation of the multi-stage shape drawing process was carried out with four types of rectangular bar. The results of the FE-simulation were trained to the nonlinear relationship between the shape parameters using an Artificial Neural Network (ANN), and the process maps were derived from them. The optimum half die angles were determined from the process maps on the dimensional accuracy. The validity of the suggested process map for aspect ratios 1.25~2:1 were verified through FE-simulation and experimentation.

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References

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