热冲压模具冷却系统流速均匀优化研究

为优化热冲压模具的冷却系统,减小各型面水管之间的流速差异,提高成形件的产品质量,针对大流速型面水管,提出了将该水管的连接水管沿两个不同方向进行偏置以降低流速的方法。以各型面水管的流速标准差为质量指标,设计正交试验,得到最佳偏置距离。由优化后的冷却系统流场及模面温度分析可知,两种偏置下各管道流速均匀性分别提高了86.2%和77.6%,模面最高温度分别下降了18.5和11.6℃,模面平均温度分别下降了13.0和5.3℃。搭建了相应的试验系统进行流速测试,试验结果和仿真吻合。研究表明,该方法能有效改善模具冷却水管流速不均,提高模面温度均匀性。

Research on flow rate uniform optimization of hot stamping die cooling system

For the water pipes with large flow rate profile, it was proposed that biasing the connecting pipe of water pipe in two different directions to reduce the flow rate in order to optimize the cooling system of hot stamping die, deduce the difference of flow rate among va-rious profiles of water pipes and improue the forming quality of forming parts. Then, taking the standard deviation of flow rate of various profiles of water pipes as quality index, the orthogonal test was designed to get the best offset distance. After the optimization, the flow field analysis and die surface temperature analysis of the cooling system were carried out, and under two kinds of bias, the velocity uniformity of each pipe increased by 86. 2% and 77. 6% respectively, the maximum temperature of die surface decreased by 18. 5 ℃ and 11. 6 ℃ respectively, and the average temperature of die surface decreases by 13. 0℃ and 5. 3℃ respectively. Furthermore, correspond-ing experimental system was set up for flow rate test, and the experimental results were found to be in good agreement with the simulated results. The research results show that the method can effectively improve the uneven flow rate of the die cooling water pipe and the tem-perature uniformity of die surface.