复杂型面零件冲压回弹参考点的选择与应用

Choice and application of reference point in springback of complex curvature parts punching

对于复杂型面零件,冲压回弹随参考点选择不同而不同,而且精确选择很难。以最小模具修模量为目标,提出一种回弹参考点选择的方法。该方法采用计算机仿真和逆向工程技术,计算回弹值并确定最优的回弹参考点。即在仿真计算中试确定回弹参考点,然后将实际冲压件通过逆向工程技术重构型面,采用迭代最近点算法将重构面与设计面进行配准,计算回弹值并分析其特征,判断参考点选择是否合理,通过与其他参考点配准结果进行对比以及实验验证,验证回弹参考点选择方法的可行性。

For the complex curvature parts, the values of springback are various according to reference points, and the reference point is difficult to choose precisely. In order to obtain the minimum amount of mould modification, a method of choosing springback reference point was presented. Based on computer simulation and reverse engineering, the values of springback were calculated to get the optimal reference point. That is, the reference point was confirmed by simulation at first, then the surface of stamping part was reconstructed by reverse engineering. The reconstructed surfaces and the designed surfaces were matched by the method of Iterative Closest Point （ICP）, and the value of spingback was calculated and analyzed to illuminate whether the choice of reference point was reasonable.The results of other reference points and experiments were compared to validate the feasibility of this method.