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A study on working limit of cold forging of carbon steel

냉간단조에 있어서 탄소강의 가공한계에 관한 연구

  • Jae, Jin-Soo (Mando Mach. Corp) ;
  • Kang, Jong-Hun (Graduate School of Busan National University) ;
  • Kang, Seong-Soo (Sheet Products Process Research Group, Dept.of Mechanical Engineering, Busan National University)
  • 제진수 (만도기계 (주)) ;
  • 강종훈 (부산대학교 대학원) ;
  • 강성수 (부산대학교 기계공학부 정밀경형 금형가공 연구센터)
  • Published : 1997.07.01

Abstract

The purpose of this work is to investigate the working limit of carbon steel and forging condition of cold forging. The fracture criteria which was proposed by Oyane and Osakada was used. Compression test, hardness study and tension test by Oyane's creteria, microstructure study by Osakada's were carried out. The results were compared with each other. It was found that working limit on compressive hydrostatic stress is increased in comparison with that of tensile stress field and can be forecasted the fracture limit of closed cold forging.

Keywords

Cold Forging;Closed Forging;Working Limit;Fracture Strain;Ductile Fracture;hydrostatic Stress