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

The Korean Society for Technology of Plasticity and materials processing (한국소성∙가공학회)
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Reason of Die Fracture in Automatic Multistage Cold Forging of a High Strength Ball-Stud

고강도 재료의 볼스타드 냉간자동단조에서 발생한 금형의 파괴 원인 분석

  • 이추실 (경상대학교 대학원 기계공학과) ;
  • 엄재근 ((사)경상대 수송기계부품기술혁신센터) ;
  • 김영수 (태양금속공업(주)) ;
  • 김응주 (한국생산기술연구원) ;
  • 전만수 (경상대학교 기계항공공학부)
  • Published : 2009.10.08
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Abstract

In this paper, a longitudinal die insert fracture which occurred during cold forging of a high strength ball-stud with a sound die design nearly optimized empirically for relatively low strength material of SCM435 is introduced and the reason is revealed. A comparative study between SCM435 and ESW105 is quantitatively made using a thermoelastic finite element method for die structural analysis coupled with a forging simulator theoretically based on a rigid-plastic finite element method. It has been shown that the longitudinal die insert fracture caused from non-optimized value of shrink fit, emphasizing that the die optimal design is inevitable for cold forging of high strength materials.

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