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유한요소법을 이용한 하이드로포밍 알루미늄 범퍼빔의 성형공정 최적화
손원식(Wonsik Son),염상혁(Sanghyuk Yum),이지훈(Jihoon Lee),김승모(Seungmo Kim) 한국생산제조학회 2017 한국생산제조학회지 Vol.26 No.4
Hydro-forming is being employed increasingly to realize lightweight vehicular parts. The bumper beam produced by this process weighs 30% less than the conventional products with equal stiffness. However, hydro-forming involves complex parameters to obtain the target geometry and low residual stress. Parametric studies are conducted using finite element analysis to obtain optimized process conditions. Through these numerical approaches, the internal and holding pressures and feeder forward stroke along the extruded direction are optimized to achieve low residual stress and to minimize springback. The numerical results are verified by experimental observations made by employing a three-dimensional laser scanner. The numerical and experimental results are compared in terms of the springback. Both results show similar tendencies.
에어 서스펜션 부품 개발을 위한 Al6061 소재의 후방 충격압출 일체 성형공정 설계인자에 관한 연구
김현성(HyunSung Kim),손원식(WonSik Son),황종일(Jongil Hwang),이진규(Jinkyu Lee),임성한(SungHan Rhim) 한국자동차공학회 2019 한국자동차공학회 부문종합 학술대회 Vol.2019 No.5
This study has conducted a forming analysis to establish design factors optimized for process of backward impact extrusion one-piece molding process. backward impact extrusion and gas bulging were performed, Finite element analysis was carried out assuming rigid-plastic and isotropic materials. In the backward impact extrusion analysis, The effective-stress distribution was higher than the tension test results. However, The materials fluidity was shown by the somewhat low critical damage value. It is expected that the shape completeness will increase if the thickness of the backward impact extrusion product decrease over the high temperature, high pressure and retention time in the gas bulging molding analysis.