锻压技术

不同间隙下硼钢板-模具界面换热系数的反演

英文标题：Inversion of heat transfer coefficient at boron steel sheet-die interface under different gaps

作者：王敏张春肖海峰李兵胡志华

分类号：TH133.3；TP395.02

出版年,卷(期):页码：2017,42(4):179-184

摘要：

确定不同条件下板料-模具界面的换热系数对控制硼钢板在热成形中的局部冷却速率、获得组织性能呈区域性分布的构件具有重要意义，还可为热成形过程精确数值仿真提供可靠的热边界条件。设计了简单、有效的实验装置以模拟硼钢板热成形中不同单边间隙下板料与模具间的传热状态，其中测温点处的温度变化仅与板料-模具界面换热系数相关，从而为界面换热系数的准确反演提供了保障。建立了界面换热系数的有限元优化模型，反演获得了不同间隙下B1500HS板与H13模具钢之间的换热系数，发现其随间隙的增大呈指数函数式减小，并对反演获得的界面换热系数进行了实验验证。

It is of significance to evaluate the heat transfer coefficient (HTC) at the sheet-die interface under different conditions for controlling the local cooling rate of sheet and hence obtaining components with tailored microstructure and properties in the hot stamping of boron steel (HSBS). Moreover, the evaluation of the HTC can provide a reliable thermal boundary condition for numerical simulation of the HSBS process. Therefore, a simple and effective experiment setup was developed to simulate the heat transfer between sheet and die under different unilateral gaps in the HSBS, and the temperatures at measurement points were related only to the HTC between sheet and die so as to improve the evaluation accuracy. A FE-based optimization model for inversion of the HTC was established, and the HTCs between sheet B1500HS and die steel H13 were obtained under various gaps. Furthermore, it is found that the HTC decreases exponentially with the increase of gap, and the evaluated inversion of HTC was verified by the experiment.

基金项目：

湖北省高等学校优秀中青年科技创新团队计划项目（T201518）；汽车动力传动与电子控制湖北省重点实验室(湖北汽车工业学院)开放基金资助项目（ZDK1201601）

王敏（1979-），女，博士，副教授 E-mail：1274385083@qq.com

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