锻压技术

连续热冲压中热物性参数的研究

英文标题：Research on thermo-physical parameters in continuous hot stamping

作者：李沁怡陈其伟

单位：安徽工业大学

分类号：TG306

出版年,卷(期):页码：2014,39(8):19-23

摘要：

以U形件热冲压为例，通过数值模拟、正交试验和函数拟合研究了连续热冲压中模具温度的变化规律以及模具导热率、工件与模具间接触换热系数和冷却水对流换热系数对模具温度的影响。结果表明：连续热冲压U形件时，模具温度在波动中上升，达到热平衡时，波动幅度不再变化。模具温度越低，对工件淬火越有利。增大模具导热率与冷却水的对流换热系数可以降低模具温度；增大工件与模具间接触换热系数，模具温度上升，U形件冷速呈抛物线变化，通过计算可以确定接触换热系数的合理取值范围。

For hot stamping of U-shaped part, numerical simulation, orthogonal test and function fitting were applied to study the variation of mold temperature in continuous hot stamping, and the influence of thermal conductivity of mold, thermal contact conductance between mold and blank and convective heat transfer coefficient of the coolant on mold temperature were also studied. Results show that in continuous hot stamping of U-shaped part, the mold temperature rises in fluctuation until thermal balance when the amplitude of fluctuation is no longer changing. Lower temperature of mold leads to better quenching effect. Increasing thermal conductivity of mold as well as convective heat transfer coefficient of the coolant leads to lower mold temperature. Increasing thermal contact conductance between mold and blank leads to higher mold temperature and parabolic cooling velocity variation of the U-shaped part, and a reasonable range for the value of thermal contact conductance can be obtained by calculation.

基金项目：

安徽省科技攻关项目（12010202015）

李沁怡（1989-），女，硕士研究生

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