汽车横梁拉深成形的有限元分析

建立了汽车横梁拉深的有限元三维模型，对其拉深成形过程进行了数值模拟，并与实验结果对比分析，说明数值模拟方法的可行性。在此基础上讨论了摩擦润滑条件、压边力和凸模的虚拟冲压速度对板料拉深过程的影响。通过有限元模拟分析方法得到最佳压边力数值，然后通过综合分析数值模拟结果和拉深实验结果确定了实际拉深过程中的最佳压边力。结果表明，在实际拉深过程中要尽量减小模具和板料的摩擦；在模拟拉深成形时，当虚拟冲压速度大于一定值时，会使模拟结果严重失真，因此，汽车横梁拉深数值模拟时最大虚拟冲压速度不要大于2000mm／s。

Finite Element Analysis of Truck Cross Member Deep Drawing Forming Process

The finite element method code DYNAFORM was used to simulate the process of truck cross member deep drawing. Predictions form simulations were analyzed and discussed against the corresponding experimental results. The effects of frictional coefficient and blank holder force and virtual punch velocity on the formability of cross member deep drawing were discussed. Optimal blank holder force was got through FEA method, and it was confirmed by analyzing the numerical results and deep drawing experimental results. The numerical results show that the friction between die and blank should be reduced as soon as possible on practical deep drawing. If virtual punch velocity goes beyond the limit while simulating the process of truck underbody cross member deep drawing, the result of simulation will be fuzzy badly, therefore the maximal virtual punch velocity should be controlled within 2 000 mm/s.