고강도강판의 스프링백 저감을 위한 서보프레스 모션특성에 관한 연구

Recently, according to many applications of high strength steel in automobile, the springback to the metal forming is one of the most important issues. Generally, big springback of advanced high strength steel(AHSS) is accompanied by the undesired shape defects. Servo press has various capabilities to improve defects, process conditions and productivity in metal forming. Also, servo press can be set to function with variable slide motion in a single operation. In this study, It was using variable slide motion of servo-press could improve the springback of 980MPa grade AHSS. And we investigated the springback(wall open angle, flange angle, side wall curl) of U-bending.