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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。
Taking 22Mn B5 high-strength steel U as an example, a hot stamping finite element model of B-column was established and the hot stamping process was numerically simulated by Deform-3D software. Setting the maximum reduction ratio and the maximum temperature difference of U-shaped parts after the pressure keeping as the evaluation index, based on numerical simulation and 3-factor 5-level orthogonal experiment method, the influence of cooling system parameters on the end of packing After the U-shaped parts of the maximum reduction rate and the maximum temperature difference size and distribution of the impact of the optimal parameters to obtain the combination of: cooling pipe diameter Φ8.5 mm, two pipe hole center spacing of 30 mm, pipe hole center and the mold surface The distance is 13 mm. Through the hot stamping test, the maximum temperature difference of the U-shaped part is 124.5 ℃ and the maximum thinning rate is 4.73% after the packing is finished, which verifies the effectiveness of the optimized parameter combination and provides a theoretical reference for the design optimization of the hot stamping die cooling system.