Transactions of Materials Processing (소성∙가공)

The Korean Society for Technology of Plasticity and materials processing (한국소성∙가공학회)
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Surface Stress Profiles at the Contact Boundary in Backward Extrusion Processes for Various Punch Shapes

후방압출에서 펀치형상에 따른 접촉경계면의 표면부하상태

  • 노정훈 (인하대학교 대학원 기계공학과) ;
  • 김민태 (인하대학교 대학원 기계공학과) ;
  • 비스아라 (인하대학교 대학원 기계공학과) ;
  • 황병복 (인하대학교 기계공학부)
  • Published : 2009.11.01
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Abstract

This paper is concerned with the analysis on the surface stress profiles of perfectly plastic material in backward extrusion process. Due to heavy surface expansion appeared usually in the backward extrusion process, the tribological conditions along the interface between the material and the punch land are very severe. In the present study, the analyses have focused to reveal the surface conditions at the contact boundary for various punch shapes in terms of surface expansion, contact pressure, and relative movement between punch and workpiece which consists of sliding velocity and distance, respectively. Punch geometries adopted in the analysis include concave, hemispherical, pointed and ICFG recommended shapes. Extensive simulation has been conducted by applying the rigid-plastic finite element method to the backward extrusion process under different punch geometries. The simulation results are summarized in terms of surface expansion, contact pressure, sliding velocity and sliding distance at different reduction in height, deformation patterns, and load-stroke relationship, respectively.

Keywords

References

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Cited by

  1. Influence of punch geometry on surface deformation and tribological conditions in backward extrusion vol.32, pp.1, 2018, https://doi.org/10.1007/s12206-017-1232-8