数值模拟热冲压工艺参数的优化设计

The Optimization Design of Hot Stamping Process Parameters Based on the Numerical Simulation

随着汽车轻量化的要求不断提高,热冲压技术得到了广泛的应用。为研究热冲压过程中各工艺参数对热冲压的影响,基于ABAQUS软件建立了超高强度钢板热力耦合模型,分别模拟了压边力、冲压速度、模具初始温度对板料等效应力变化情况,并经过实冲实验验证了仿真的准确性。结果表明,随着压边力和冲压速度的增加,等效应力随之增加,随着模具初始温度的增加,等效应力不断减小,最大应力和危险截面出现在凸模圆角区,实验结果和模拟结果相吻合,并据此得出了最佳工艺参数。

With the increasing requirement of the automotive lightweighting, hot stamping has been widely used. In order to study the effect of process parometers to hot stamping, the coupled thermo-mechanical model of ultra high strength steel has been established, basing on ABAQUS software. With the changes of the blank holder force （BHF）, the punch speed and initial temperature, the distribution of equivalent stress of UHSS was simulated, and the simulation was verified after a real stamping the accuracy of the by the experiments. The results show that the equivalent stress increases with the increase of BHF and pressing speed. However, the equivalent stress decreases with the increase of initial tools temperature, and the maximum stress and dangerous section is in punch fillet areca The experimental results and simulation results are identical very well and the process parameters of hot stamping process are optimized.