Residual Stress Evolution during Leveling of Hot Rolled Cold Forming Purpose High Strength Coils and Camber Prediction

냉간 성형용 열연 고강도 강판의 교정 중 잔류음력 변화와 절단 후 camber 발생 거동 연구

In order to investigate the residual stress evolution during the leveling process of hot rolled high strength coils for cold forming, the in-plane residual stress of plate sampled at SPM, rough leveler and finish leveler were measured by cutting method. Residual stress was localized near the edge of plate. As the thickness of plate was increased, the region with residual stress was expanded. The gradient of residual stress within plate was reduced during the leveling process. But the residual stress itself was not removed at the ranges of tested conditions. From the measured residual stress distribution within the plate, camber of plate cut to small width was predicted exactly within error range of experiment.