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송민재(M.J.Sogn),금영탁(Y.T.Keum),이종문(J.M.Lee),이인규(I.K.Lee),송명환(M.H.Song),박진수(J.S.Park) 한국자동차공학회 2004 한국자동차공학회 춘 추계 학술대회 논문집 Vol.- No.-
The simultaneous dies-press structural model of the front fender dies operating in a double action type hydraulic press, which considers the mutual action between die and press, was adopted for the stress analysis of punch, die, blank holder and holder riser. By examining the stress distribution of press/dies varying according to the changes in the thickness and shape of blank holder riser, the shape and size of the riser are optimized and the strength and deformation of the dies are evaluated.
1500MPa급 핫스탬핑 강판의 연화열처리에 관한 기계적 특성 평가
심우정(W. J. Sim),전형준(H. J. Jeon),박용호(Y. H. Park),송명환(M. H. Song),김경보(K. B. Kim) 한국소성가공학회 2015 한국소성가공학회 학술대회 논문집 Vol.2015 No.5
Ultra-High strength steel is rapidly being applied in the automotive industry as safety regulation and environmental regulation have been tightened controls. So, The of Hot-Stamping steel what has two advantages has been on the rise. The First strength is that Hot-Stamping steel is obtained formability by processing at high temperature. And the second is the reducing weight due to spring-back and thickness reduction. However, Hot-Stamping steel has one drawback which is caused brittle fracture upon impact. So researchers are using a method of changing the material or the material properties locally through a partial quenching to make up for drawback. But, these two ways have problems of weld zone and schedule-cost. In this study, we use the local heat treatment process using a induction heating capable of applying the heat treatment region and reducing of processing time. The experiment was conducted as a method for output variance when the induction heating. And then the temperature and the hardness applied to the material were measured. Is this way, we studies the affect of hot-stamping steel with induction-heating.