锻压技术

超高强度钢热冲压成形过程仿真研究

英文标题：Simulation study on hot stamping process of ultra high strength steel

作者：邹伟张立强暂志伟刘灿军

分类号：TG385

出版年,卷(期):页码：2018,43(8):75-79

摘要：

首先,根据力学和热物性实验数据建立了热冲压工艺的材料模型，通过分析坯料与模具交界面的传热特性和摩擦系数，有效确定了热冲压模拟的边界条件。然后，利用LS-DYNA软件对整个热冲压过程进行数值模拟，分析了热冲压成形过程中不同时刻成形状态和温度分布以及板料不同位置的温度变化。最后，对热冲压成形后坯料的力学性能进行了测试和分析。研究发现，由于坯料/模具界面的冷却条件影响，热冲压件的力学性能表现出非均匀的现象，与其他位置相比，部件的侧壁具有更高的抗拉强度和屈服强度，同时，这一现象与实验结果吻合较好。

The material model of the hot stamping process was firstly set up based on experimental data of mechanics and thermal physical properties, and the boundary condition of the hot stamping simulation was determined effectively by analyzing the characteristics of heat transfer and friction coefficient at the interface between blank and die. Then, the whole hot stamping process was simulated by software LS-DYNA, and the forming state and temperature distribution at different time in the hot stamping process and the temperature variation with time in different positions of blank were analyzed. Finally, the mechanical properties of blank after hot stamping were tested and analyzed. It is found that the mechanical properties of hot stamping parts show an inhomogeneous phenomenon due to the influence of cooling condition at the blank/die interface, and the sidewall of part has a higher tensile strength and yield strength compared with other locations. At the same time, this phenomenon is in good agreement with experimental results.

基金项目：

湖南省自然科学基金资助项目(2018JJ2681)

邹伟(1991-)，男，硕士研究生，E-mail：429606865@qq.com；通讯作者：张立强(1978-)，男，博士，副教授，E-mail：21384881@qq.com

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