控制策略下热冲压模具升温传热仿真

Heat transfer simulation of hot stamping die heating process under control strategy

应用ABAQUS软件,建立了B柱软区模具瞬态传热有限元仿真模型,以模具模面温度为优化目标、模面温度均匀分布为约束条件,结合Python二次开发工具,建立基于模面温度反馈控制的有限元仿真计算方法,分别实现了模糊控制与模糊PID控制下的模具升温过程有限元计算。仿真结果表明,模糊控制下模具模面温度50 min内达到(500±30)℃,而约束条件增强后的模糊PID控制下模具模面温度40 min即达到工艺要求,升温效率明显提高。应用模糊PID仿真控制程序控制模具进行升温实验,实验结果验证了仿真的准确性,成功地指导了模具升温控制的程序设计。

A transient heat transfer finite element model( FEM) of die in soft zone of automobile B-pillar was established by software ABAQUS. Then,taking the die surface temperature as the optimization target and the uniform distribution of die surface temperature as the constraint condition,the finite element simulation calculating method based on the die surface temperature feedback control was established by Python secondary development tool,and the finite element calculations of die heating process under fuzzy control and fuzzy PID control were realized,respectively. The simulation results show that under the fuzzy control,the die surface temperature reaches( 500 ±30)℃ within fifty minutes,while under the fuzzy PID control with the enhanced constraint conditions,the die surface temperature reaches the process requirements after forty minutes,and the heating efficiency is significantly improved. Finally,through the die heating experiment controlled by the fuzzy PID simulation control program,the experiment result verifies the accuracy of the simulation,and the program design of the heating control of die is successfully guided.