Journal of the Korean Society of Manufacturing Process Engineers (한국기계가공학회지)

The Korean Society of Manufacturing Process Engineers (한국기계가공학회)
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A Study on Heat Treatment for Improving Cold Forgeability of a Bearing Steel, SUJ2

베어링강 SUJ2의 냉간 단조성 향상을 위한 열처리에 관한 연구

  • 김해지 (진주산업대학교 자동차공학과)
  • Received : 2009.02.18
  • Accepted : 2009.03.27
  • Published : 2009.03.30
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Abstract

In this paper, the effect of heat treatment on forgeability is investigated and an improved heat treatment cycle is proposed for the bearing steel, SUJ2. An application example of a bearing inner race cold forging, which has small cracks in the bottom after backward extrusion and piercing, is found from a cold forging industry. The process is evaluated by finite element analysis and several heat treatment cycles are examined in order to propose an improved heat treatment cycle. The effect of heat treatment on material hardness and tool life, dimensional accuracy and forming load is revealed through experiment.

Keywords

References

  1. H.Kudo, 1992, "Academic-Industrial Coorperation to Improve and Expand Cold-Forging Technology in Japan ", J. Mat. Proc. Tech., Vol. 35, pp. 259-274. https://doi.org/10.1016/0924-0136(92)90322-J
  2. M.S.Joun and M.C.Lee, 1997, "Quadrilateral Finite-Element Generation and Mesh Quality Controlfor Metal Forming Simulation", Int. J. Num. Methods Eng., Vol. 40, pp. 4059-4075. https://doi.org/10.1002/(SICI)1097-0207(19971115)40:21<4059::AID-NME249>3.0.CO;2-E
  3. M.S.Joun, H.K.Moonand R.Shivpuri,1998,"Automatic Simulation of a Sequence of Hot - Former Forging Processes by a Rigid-Thermoviscoplastic Finite Element Method," ASME Trans., J. Eng. Mat. Tech., Vol. 120, pp. 291-296. https://doi.org/10.1115/1.2807016
  4. 이광오, 진민호, 제진수, 남원수, 강성수, 2003, " OP Shaft용 냉간 단조 성형 공정 개발 및 SNCM 강의 단조성 향상에 관한 연구," 한국소성가공학회지, 제 12권, 제 5호, pp 472-478.
  5. 김영석, 김현수, 김찬일, 2000,"토크 컨버트 임펠러 허브의 냉간 단조 공정 설계," 한국정밀공학회지, 제 17권, 제 11호, pp 213-219.
  6. 오승환, 공형걸, 강정호, 박영철, 2007,"DACE 모델을 이용한 게이트밸브 단조공정의 최적설계화," 한국기계가공학회지 제6권 제1호, pp. 71-77.
  7. C.H.Ryu and M.S.Joun, 2000, "Finite Element Analysis of a Cold Forging Process Having a Floating Die," Transactions of Materials Processing, Vol. 9, No. 2, pp.159-164.
  8. M.S.Joun, M.C.Lee, C.H.Ryu and H.S.Cho, 2000, "A Structural Analysis System for Forging Die Sets Design, AFDEX/DIE," Transactions of Materials Processing, Vol. 9, No. 2, pp.165-170.
  9. 남원종, 2002, "구상화 열처리 기술의 발전 동향", 한국소성가공학회지, 제11권 제5호, pp. 381-387.