한국소성가공학회:학술대회논문집 (Proceedings of the Korean Society for Technology of Plasticity Conference)

한국소성∙가공학회 (The Korean Society for Technology of Plasticity and materials processing)
권호 표지

열간 후방압출된 Ti-6Al-4V 튜브의 성형결함 해석

Assessement of Forming Defects in Hot Backward Extruded Ti-6Al-4V Tube

  • 염종택 (한국기계연구원, 공정연구부) ;
  • 심인규 (한국기계연구원, 공정연구부) ;
  • 나영상 (한국기계연구원, 공정연구부) ;
  • 박노광 (한국기계연구원 공정연구부) ;
  • 홍성석 (국방과학연구소, 기술연구본부) ;
  • 심인옥 (국방과학연구소, 기술연구본부)
  • 발행 : 2003.05.01
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초록

The metal forming behavior and defect formation in Ti-6Al-4V tube during hot backward extrusion were investigated. To predict the forming-defects such as shear band, inner cracks or surface cracks, dynamic material model(DMM) including Ziegler's instability criterion and modified Cockcroft-Latham fracture criterion(C-L model) were used. These models were coupled to the internal variables generated from FE analysis. The chilling effect and friction indicated a great influence on the deformation mode of the tube and the formation of surface cracks. The simulation results for the backward extrusion were compared with the experimental observations.

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