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마그네슘 판재의 레이저 국부가열 헤밍성형 제품 미세조직변화 고찰
정경근(K. G. Jung),김래형(R. H. Kim),윤태욱(T. W. Yoon),이규현(K. H. Lee),김동옥(D. O. Kim) 한국소성가공학회 2014 한국소성가공학회 학술대회 논문집 Vol.2014 No.5
In recent, there is an active research for automotive companies to apply magnesium alloy sheet on automotive body structure including outer panel components. For moving parts such as hood, door, trunk lid, and fender, hemming process is necessary since they consist of outer panel and inner panel. Hemming is the process which the flange of outer panel is bent over the around of inner panel to assemble together. Roller hemming has been applied for aluminum components since this is a desirable process for small number of production due to its longer cycle time than conventional press hemming. It has also been considered as an appropriate process for aftermarket due to its flexible production system. However, it is still difficult to apply roller hemming process on magnesium alloys since the formability of the alloy is limited at room temperature. Thus, in this research, AZ31 has been roller hemmed with laser heating, and its microstructure has been studied after hemming process.
자동차용 도어 모듈의 측면 충돌특성에 관한 실험적 연구
전성진(S. J. Jeon),김민호(M. H. Kim),이규현(G. H. Lee),이문용(M. Y. Lee) 한국소성가공학회 2010 한국소성가공학회 학술대회 논문집 Vol.2010 No.10
The door stiffness is one of the important factors in the side impact. Generally, the researches have been conducted on the assembled automotive body. This study is to analysis the side impact characteristics for automotives door module. The impact characteristics have been determined by door module side impact test machine. To determine the initial, intermediate and peak crush resistances use the plot of load versus displacement and obtain the integral of the applied load with respect to the crush distances specified below for each door tested. The initial crush resistance is the average force required to deform the door through the initial 6 inches of crush. The intermediate crush resistance is the average force required to deform the door through the initial 12 inches of crush. The peak crush resistance will be directly obtained from the plot of load versus displacement since it is the largest force required to deform the door through the entire 18 inches crush distance. The data are used to determine if a specific vehicle or item of automotives equipment meets the minimum performance requirements of the subject Federal Motor Vehicle Safety Standard(FMVSS). FMVSS Static 214, Side impact protection, specifies performance requirements for protection of occupants in side impact crashes.