980MPa급 초고강도강판을 이용한 센터 플로 사이드 멤버의 성형공정 연구

Ultra high strength steels(UHSS) are widely used to fill the needs of lightweight part for automobile, and the control of springback is very important factor in sheet metal forming using UHSS. In this study, to lighten the center floor side member(CFSM) which is normally manufactured using 600~800MPa steel sheet, new design of the manufacturing process for CFSM using APFC980 has been proposed. To accomplish this goal, the influence of process variables such as die corner radius and die wall angle on the springback were investigated using FE-analysis. In order to insure the validity of FE-analysis, the springback results of FE-analysis was verified with prototype product.