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Sub Pad를 이용한 도어 외판 핸들부 주위 미세면굴곡 저감
김목유(Mokyou Kim),최보성(Bosung Choi),주재혁(Jaehyck Joo),이덕영(Dugyoung Lee) 한국자동차공학회 2013 한국자동차공학회 부문종합 학술대회 Vol.2013 No.5
Surface deflections are generally occurred in door outer handle area or fuel injection area where the shape of its section is changed suddenly. Usually, their basic cause is compressive stress occurred in forming process because of different touching time between die and panel. Surface deflection amounts can be reduced with sub pad which is pressing down around handle area prior to forming concave door handle. New die structure with it is developed and applied to minimize surface deflection amounts through the forming analysis, springback analysis, comparison of surface deflection amounts depending on the parameters and analysis of distances between sub pad and punch depending on padding forces. To analyze effectively surface deflection occurred around door outer handle area, die of door outer panel is manufactured partly containing door handle area. And to determine its proper size, the preceding investigation is executed through the simulations. To compare surface deflection amounts with typical dies and suggested dies with sub pad, simulations according to the process of surface deflection analysis are executed and then 3D scanning is preformed with stamping panel to verify effect of sub pad.
Upform 공법을 이용한 사이드 실 인너 패널의 스프링백 저감
최보성(Bosung Choi),김목유(Mokyou Kim),주재혁(Jaehyck Joo),이덕영(Dugyoung Lee) 한국자동차공학회 2012 한국자동차공학회 학술대회 및 전시회 Vol.2012 No.11
Springback, an elastic material recovery after the unloading of stamping tools, causes variations and inconsistencies of final part dimensions. The higher the tensile strength of steel sheets goes up, the larger the springback of them occurs. Recently, automotive industry has given much more attention to high-strength steel sheets in order to obtain high fuel efficiency and impact safety. To reduce springback of steel sheets, upform method is proposed. Its main concept is to strike the end of steel sheets normally during stamping process. The feasibility of upform method is verified by stamping analysis of side sill inner panel using PAMSTAMP 2G. The portotype sample panel is made by press steel die and the analysis data is compared with the measurement data of 3D CMM.