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와이어 하네스의 커넥터 압착공정에 대한 3차원 유한요소해석
구선모(S. M. Gu),윤철호(Z. H. Yin),박진기(J. K. Park),최현순(H. S. Choi),김영석(Y. S. Kim) 한국소성가공학회 2009 한국소성가공학회 학술대회 논문집 Vol.2009 No.10
According to the increase of intelligent vehicles many automotive electric components are installed. The wire harness which connects those also increases. The crimping process for compressing the copper wire bundle into the terminal is a key process to assure the good quality of wire harness. For the case of inadequate forming condition many shape failures such as less-filling, over-filling are happen in the crimping process. Even though the quality of crimping shape is satisfactory the quality check for electrical resistance of wire harness is sometime not satisfied the qualification due to large variation of electrical resistance of wire harness under climate test. This large variation is though to be related with the malfunction automotive electric system and caused by the internal stress of wire, which occurred during the crimping process. In this paper we develop the 3D-FEM simulation scheme and design methodology of optimum terminal shape. Also the effect of terminal shape on the residual stress is discussed.
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.