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김성현(S. H. Kim),서성렬(S. Y. Seo),정순종(S. J .Jung),전만수(M. S. Joun) 한국소성가공학회 2010 한국소성가공학회 학술대회 논문집 Vol.2010 No.5
In this paper, finite element approach is applied to reveal causes of punch fracture occurred in cold forging of a simple axi-symmetric part. Finite element results show that the forging process has nothing to do with the punch fracture and thus we try to find the cause from the ejection process. The mechanical situation during the ejection process is considered as the same with that at the final stroke of the forging process only except that the interfacial stress along the punch and material is free. We can predict the interference between punch and material, which first causes damage on the coated die surface leading to final fracture of the punch.