热成形淬火过程模具/板料界面接触热阻的测量计算方法概述

Overview of methods for measuring and calculating thermal contact resistance at the interface of die and blank during hot forming quenching process

分析了固体界面接触热阻的形成机理和影响接触热阻数值的诸多因素,并根据热成形淬火过程模具/板料界面的传热模型,基于傅里叶定律对其界面传热情况进行分析,利用热阻的思想推导出界面接触热阻的表示方法。对已有的测量、计算热成形模具/板料界面接触热阻的方法进行概述:逆热传导法基于导热微分方程和傅里叶定律,通过测得的热流密度计算得到接触热阻;间接法依据接触电阻和接触热阻有相同的产生原因,通过特定装置测定接触电阻再根据接触电阻和接触热阻的关系计算得到接触热阻。最后从测量装置、测量计算原理和测量计算的过程等方面对两种方法进行了比较,并分析了界面接触热阻对热成形模具以及新型材料研发的重要性。

Mechanism of thermal contact resistance （TCR） at the interface of solid-solid and factors which have influence on TCR value were researched. According to the heat transfer model of the interface between die and blank in the hot forming quenching and the analysis on heat transfer at the interface based on Fourier＇s law, representing method of interface TCR was deduced by the ideas of thermal resist- ance. The existing methods of measuring and calculating TCR at the interface of die and blank in the hot forming quenching process were reviewed. Based on differential equation of heat conduction and Fourier＇s law, TCR can be calculated through measuring heat flow density by inverse heat conduction method, while based on contact resistance and TCR generated for the same reason, TCR can be calculated by indirect method according to the relationship of contact resistance measured by specific device and TCR. At last, inverse heat conduction method and indirect method were compared according to the measuring apparatus, the calculating principles and process. At the same time, the importance of interface TCR to the design of hot forming die and the development of new material were analyzed.