车用DP780高强钢板热冲压成形数值模拟及模具磨损

Numerical simulation of hot stamping and mold wear of DP780 high strength steel plate for automobile

以车用DP780高强钢板为研究对象,借助Deform-3D仿真系统,建立了热冲压仿真模型,分析了DP780高强钢板的变形过程以及成形效果。以热冲压磨损理论为支撑,以DP780高强钢板的成形质量为先决条件,对冲压模具的磨损状况进行了研究与改进。运用正交试验,建立了关于钢板温度、模具间隙、冲压速度及摩擦因数的4因素3水平的模拟方案,并通过灰色关联法将凸、凹模磨损的双目标优化问题简化为关于关联度的单目标优化问题,最后采用极差分析法确定了各变量在区间内的最优解。模拟结果表明,优化后,凸模磨损减小了31.61%,凹模磨损减小了24.98%。根据实际冲压结果可知,DP780高强钢板成形良好、质量佳、无缺陷,冲模寿命与预测结果接近。有限元模拟可参考性较高,该优化手段对实际生产具有一定的指导性。

For DP780 high strength steel plate for automobile,with the help of Deform-3D simulation system,the hot stamping simulation model was established,and the deformation process and forming effect of DP780 high strength steel plate were analyzed.Based on the hot stamping wear theory,and taking the forming quality of DP780 high strength steel plate as the prerequisite,the wear condition of stamping mold was studied and improved.By using orthogonal test,a four factors and three levels simulation scheme about steel plate temperature,mold clearance,stamping speed and friction coefficient was established.The double objective optimization problem of punch and die wear was simplified to a single objective optimization problem about correlation degree by grey correlation method.Finally,the optimal solution of each variable in the interval was determined by range analysis method.The simulation results show that after optimization,the punch wear is reduced by 31.61%and the die wear is reduced by 24.98%.According to the actual stamping results,DP780 high strength steel plate has good forming effect,good quality and no defects,and the stamping mold life is close to the predicted results.The reference value of the finite element simulation is high,and the optimization method has certain guidance to the actual production.