锻压技术

非均匀温度场对高强钢热冲压成形性的影响

英文标题：Influence of non-uniform temperature field on hot stamping formability of high strength steel

作者：谭海林赖春明

单位：湖南化工职业技术学院

分类号：TG386

出版年,卷(期):页码：2015,40(9):32-36

摘要：

针对某企业25MnB5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。

For the problem of fracture defect at the groove lateral of the component made of high strength steel 25MnB5 in hot deep drawing process, the non-uniform temperature field of the U-shaped workpiece during hot stamping process was simulated by the dynamic FEM software ANSYS/LS-DYNA. It was analyzed the influences of stamping rate and friction coefficient between the blank and the die on the temperature field. The results show that high stamping rate and small friction coefficient are helpful to form a more uniform temperature field of the component and can reduce the possibility of fracture defect at the groove lateral. When the optimized process parameters such as stamping rate 300 mm·s-1 and friction coefficient 0.15 are used in the hot stamping process, the good quality produces can be obtained and the reliability of their simulation results can be assured.

基金项目：

湖南省科技计划项目（2014GK3059）；湖南省教育厅科学科研项目（15C0468）

谭海林（1968-），男，硕士，副教授

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