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接触热阻是影响热冲压过程中热能传导的一个重要因素,而零件不同区域的温差则直接影响热冲压的回弹,因此,获得准确的接触热阻数值对提高热冲压回弹仿真的精度具有重要意义。基于稳态法设计了22MnB5板件与Cr7V模具钢接触热阻的测量实验,推导出接触热阻的计算公式;并按照实验方法搭建了实验平台,获得了不同压强下两者的接触热阻值;最后拟合了接触热阻与压强的关系方程。将关系方程带入某B柱的热冲压回弹仿真中,与原始仿真对比发现,改进后的仿真结果与实际实验值较为接近,证明获得准确的接触热阻与压强的关系方程可提高硼钢板热冲压回弹的仿真精度。
The thermal contact resistance is an important factor that affects the heat conduction during hot stamping. The temperature difference between different parts of the hot stamping directly affects the hot stamping springback. Therefore, obtaining the accurate contact thermal resistance value has the advantages of improving the precision of hot stamping springback simulation Significance. Based on the steady-state method, the experiment of measuring the thermal contact resistance between 22MnB5 and Cr7V tool steel was designed and the calculation formula of contact thermal resistance was derived. The experimental platform was built according to the experimental method, and the thermal contact resistance Finally, the relationship between contact resistance and pressure is fitted. The relational equation is introduced into a hot stamping springback simulation of a B-pillar. Comparing with the original simulation, it is found that the improved simulation result is close to the actual experimental value, which proves that obtaining the accurate relational equation of contact thermal resistance and pressure can increase boron steel sheet Hot stamping springback simulation accuracy.