锻压技术

基于数值模拟的U形件热冲压工艺参数研究

英文标题：Investigation for process parameters of U-shaped part hot stamping based on numerical simulation

作者：王荣吉冯晓欣张立强娄宽

分类号：TG306

出版年,卷(期):页码：2014,39(5):29-35

摘要：

保压结束后的温度分布对高强钢热冲压零件的组织性能至关重要。以U形件为例，建立热冲压有限元模型，通过基于数值模拟的正交实验讨论了热冲压工艺参数板料成形初始温度、冲压速度、保压时间、摩擦系数对保压结束后U形件最大温差的影响。结论指出：保压时间对保压结束后U形件最大温差的影响显著，延长保压时间可显著降低保压结束后U形件的最大温差；板料成形初始温度显著水平次之；冲压速度与摩擦系数影响较小。同时确定了优化工艺参数组合。在此基础上进行了U形件热冲压试验，模拟结果与试验结果基本吻合，U形件温度变化趋势基本一致，验证了数值模拟的正确性与可靠性。

The temperature distribution after packing process is essential to structure and performance of high-strength steel hot stamping parts. In the case of U-shaped parts, the finite element model of hot stamping was established. And the influences of process parameters including initial forming temperature of blank, stamping speed, holding time and frictional coefficient on the maximum temperature difference of U-shaped parts after packing process were discussed by orthogonal experiment based on numerical simulation. The result shows that holding time is the most significant factor for the maximum temperature difference of U-shaped parts after packing process, and extending holding time can reduce the maximum temperature difference of U-shaped parts after packing process significantly. Initial forming temperature of blank is the second, while stamping speed and frictional coefficient have little influence. And the optimal process parameters combination was obtained. Based on the simulation, the U-shaped parts hot stamping test was done. The simulation and test results coincide basically with the same variation trend, and the validity and reliability of numerical simulation were verified.

基金项目：

湖南省教育厅科研基金资助项目(13B145)；中南林业科技大学大学生研究性学习和创新性实验计划项目

王荣吉（1971-），男，博士，副教授

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