基于Deform的热成形冷却系统优化

以22Mn B5高强度钢U形件为例,建立B柱热冲压有限元模型,并通过Deform-3D软件对热冲压过程进行数值模拟。设定保压结束后U形件的最大减薄率以及最大温差作为评价指标,基于数值模拟和3因素5水平正交实验方法,分析了在多指标因素不同水平下冷却系统参数对保压结束后U形件的最大减薄率以及最大温差大小和分布规律的影响,获得参数的优化组合:冷却管道直径为Φ8.5 mm,两管道孔中心间距为30 mm,管道孔中心与模具型面距离为13 mm。通过热冲压实验,得到保压结束后U形件的最大温差为124.5℃,最大减薄率为4.73%,验证了优化参数组合的有效性,为热冲压模具冷却系统设计优化提供了理论参考。

Optimization on cooling system in the hot stamping based on Deform

For U-shaped part of high-strength steel 22MnB5, a finite element model of hot stamping for B-pillar was established, and the hot stamping process was simulated by Deform software. Then, the maximum thinning ratio and the maximum temperature difference of U-shaped part after holding pressure process were set as evaluation indexes, and the influences of cooling system parameters on their size and distribution were analyzed under different levels of the multi-index factors based on the numerical simulation and orthogonal experiment with three-factor and five-level. Finally, the optimal parameter combination was obtained with the pipeline diameter ofΦ8. 5 mm, the dis-tance between two pipelines of 30 mm and the distance between the pipeline center and the die surface of 13 mm. The experimental results show that the maximum temperature difference of U-shaped part is 124. 5℃, and the maximum thinning ratio is 4. 73%. Thus, the feasi-bility of the optimal parameter combination is verified, and a theoretical reference is provided for the parameter design of cooling system in hot stamping dies.