高强钢板热冲压模具冷却水道优化设计

Optimization Design on Cooling Water Channel of Hot Stamping Mold of High Strength Steel

利用ANSYS/LS-DYNA模块对保压淬火过程零件及模具的温度场分布进行了数值模拟,分析高强钢板热冲压模具冷却系统均布水道的不足。在此基础上通过APDL参数化编程语言,选择零阶与一阶搜索相结合的优化算法,编写优化程序,以模具冷却水道半径、相邻水道间隔尺寸和水道与模面距离等参数为优化变量,以板料温度分布均匀和保证降温速率达到临界冷却速率为优化目标建立目标函数,优化后目标函数值为26.553(优化前为64.404)。对优化前后成形件的温度分布进行了比较,得到成形件最高温度下降了44.5%,最低温度下降了14.5%,实现了对冷却水道各参数的优化。最后通过实验验证了优化结果的正确性。

The temperature distribution of parts and mould was simulated by ANSYS/LS - DYNA. The shortcomings of the uniform waterway were analyzed. APDL was applied over the thermal field simulation. Zero-order search and fist-order search was combined as the optimization algorithm. In this program, the radius of holes, the distances of adjacent holes and the distances of holes and the profile were chosen as optimization variables. The well-distributed temperature of parts and the needed critical cooling rate were chosen as the optimization objectives to create the objective function. Objective function value was 26. 553 after the optimization which was 64. 404 before the optimization. By comparing the temperature distribution of the optimized cooling water channel with original, it can be seen that the maximum temperature was decreased by 44.5% and the lowest temperature was decreased by 14.5% , to realize the optimization design of parameters of the cooling water channel. Finally the experiment had been designed to verify the correctness of the optimization result.