基于模具变形分析的防撞梁回弹预测精度研究

Accuracy study of springback prediction for anti-collision beam based on die deformation

以某车型材料为DP780的防撞梁制件及其冲压模具为研究对象,利用有限元数值模拟与试验相结合的研究方法,探讨模具弹性变形对制件回弹预测精度的影响。结果表明:当制件成形时,压边圈与凹模接触压强在0.02～0.04GPa之间,凸模与凹模中心区域的接触压强在0～0.01GPa之间,通过不等间隙型面和理想等间隙型面预测的制件回弹量与实际试模结果相比,前者预测精度误差平均减少17%以上,有效提高了超高强度钢板制件的回弹预测精度。

An anti collision beam and die were investigated by combination of finite element simulation and tryout meth ods. The effect of die elastic deformation to springback prediction accuracy was studied. The results show that when panel is formed, the contact pressure between binder and die is 0. 02-0. 04 GPa and the value is 0-0.01 GPa in the center area between punch and die. Combined with die tryout results, the springback prediction error by simulation with compensated die face is reduced by 17% in average. The simulation method considering die elastic deformation can improve the springback prediction accuracy greatly for ultra high strength steel panels.