Improvement of Formability in Automobile Panels by Variable Blank Holding Force with Consideration of Nonlinear Deformation Path

1 성우하이텍 금형설계팀 (Die Design Team, Sungwoo Hightech)2 서울과학기술대학교 대학원 제품설계금형공학과(Deptartment of Product Design and Manufacturing Engineering, Graduate School,Seoul National University of Science and Technology)3 현대자동차 툴링센터 프레스금형설계팀 (Press Stamping Tool Design Team, Hyundai Motors Corporation Tooling Center)4 서울과학기술대학교 기계시스템디자인공학과 (Department of Mechanical System Design Engineering,Seoul National University of Science and Technology) Corresponding author: wjchung@seoultech.ac.kr, Tel: +82-2-970-6390