高强度钢板室温冲压成形中温度效应的数值仿真

Numerical Analysis of Temperature Field on the Contact Interface During Cold Stamping

采用数值仿真方法,通过引入与应变率相关的本构方程来建立先进高强度DP590钢U形件弯曲过程仿真模型,分析了不同速度下DP590钢板与模具的界面温度和接触压力变化情况.结果表明:在高速冲压的仿真过程中,引入与应变率相关的本构方程将显著提高界面温度场的预测精度;随着冲压速度提高,界面温度明显升高;应变率引起的材料应变硬化对界面温度的影响显著.

A U-shaped bending numerical model considering strain-dependent constitutive equation was proposed based on the finite element method,and the changes of contact pressure and temperature at the interface between the die and blank during dual-phase steel DP590 stamping were presented in this paper.The investigation shows that the proposed model can enhance the prediction accuracy of the temperature during high speed stamping which introduces the strain-dependent constitutive behavior into the numerical model,and that the temperature increases with the increase of forming velocity,in which the strain hardening of the material that is dependent on the strain rate have a significant influence on the temperature.