Research on springback mechanism in flexible roll-forming

By setting different technological conditions,such as flange height,flange forming radius,sheet thickness and material property,the flexible roll-forming FE model was built to simulate the springback phenomenon of the flange,and some experimental tests were carried out.The results demonstrate that the flange height,which is not easy to be interfered,plays a dominate roll in flange springback of flexible roll-forming.The flange forming radius also has a strong influence on the flange springback,but weaker than the flange height.Compared with flange height and flange forming radius,sheet thickness and material property have much less effect on flange springback angle.During flexible roll-forming,the flange height suffers a greater deformation in forming direction compared with conventional roll-forming,and then serious longitudinal residual stress is created.In this way,serious springback in the flexible flange is caused.