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박병철(B. C. Park),배경운(K. U. Bae),구선모(S. M. Gu),장승현(S. H. Jang),홍성훈(S. H. Hong),김영석(Y. S. Kim) 한국소성가공학회 2010 한국소성가공학회 학술대회 논문집 Vol.2010 No.5
The application of high strength steels(HSS) for automotive part is growing due to the expectation of considerable weight reduction. Chassis parts, for example control arms and trailing arms, have developed by applying various high strength steels for weight reduction design and increased fatigue durability. Besides, various high strength steels, i.e, dual phase steel(DP), ferrite bainite steel(FB), have been developed by the reduction for good durability as well as press formability. In flanging of high strength steels, edge cracking may occur. This article discussed the effects of edge quality and how it determines edge stretchability, as well as finite element simulation (FEM) for blanking and hole expanding processes. Special attentions are paid on the significance of sheared edge and burr orientation in the hole expansion ratio (HER) of high strength steels. From these studies we concluded that ferrite bainite steel shows better stretch-flangeability in comparison to dual phase steel due to the lower work hardening rate at the sheared edge.