板材多点成形使用弹性垫后回弹的数值模拟

Numerical simulation of springback of the multi-point forming for plank after using elastic cushion

利用有限元软件LS-DYNA对板材冲压成形的回弹进行数值模拟。使用3mm厚的弹性垫抑制板材成形产生的压痕,但弹性垫的使用加上板材的回弹会导致成形误差的增大。基于数值模拟的结果,提出了修正基本体群成形面补偿回弹。经过两次补偿,精度得到了很好的提高,证明该方法可以很好地补偿多点成形中的回弹。

In this paper, finite element software LS-DYNA was used to simulate plate stamping springback. 3 mm thick elastic cushion inhibitted dimple of sheet forming, but the use of elastic cushion and plate springback would lead to shape error. A method was proposed which modified the forming surface of element group in the Multi-point forming（MPF） by iterative ways according to the numerical simulation results. The accuracy of forming was improved after two compensation, it was proved that this method can compensate springback of the multi-point forming.