Springback and longitudinal bow in chain-die forming U and hat channels

Springback and longitudinal bow are two major shape defects in gradual forming processes like chain-die roll forming. In this study, the springback of AHSS hat U profiles investigated through experiment finite element simulation. The disparity along direction signifies complex deformation during Based on simulation forming, process realized by sequential die blocks causes bending reverse-bending web area redundant sheet metal, which leads to nonuniform moment accumulated stresses direction. At same time, will also result strain edge, while downhill characteristic reduces maximum edge introduces web. distribution transversal disparate downward upward bowing for formed profiles. By established model, behavior can be quantitatively evaluated, is helpful design.