针对某企业25Mn B5高强钢车身凹槽零件在进行热拉深成形时出现凹槽侧壁断裂的缺陷,采用ANSYS/LS-DYNA动力学有限元分析软件对U型件热冲压成形过程的非均匀温度场进行数值模拟,分析讨论了冲压速率、板料与模具之间摩擦系数对温度场的影响规律。分析结果表明:提高冲压速率、减小模具与板料之间的摩擦系数有利于成形零件温度场的均匀分布,并且可以减少凹槽侧壁产生断裂缺陷的可能性。采用优化后的工艺参数,即冲压速率为300 mm·s-1、板料和模具之间的摩擦系数为0.15进行凹槽零件的热拉深成形试验,获得了合格的产品,验证了模拟结果的可靠性。 Aiming at the defect that a groove wall of a 25Mn B5 high-strength steel body groove part is cracked during the heat drawing process, a non-uniform hot stamping process of the U-shaped part is carried out by ANSYS / LS-DYNA dynamic finite element analysis software The numerical simulation of the temperature field is carried out. The influence of the ram rate, the friction coefficient between the sheet metal and the mold on the temperature field is analyzed and discussed. The analysis results show that increasing the stamping rate and reducing the friction coefficient between the die and the sheet is in favor of the uniform distribution of the temperature field of the shaped part and can reduce the possibility of fracture defects in the sidewall of the groove. Using the optimized process parameters, namely the stamping rate of 300 mm · s-1, the friction coefficient between the sheet and the mold is 0.15, the hot-drawing test of the groove parts is carried out, and the qualified products are obtained. The simulation results are validated The reliability.