H13钢淬火过程中综合换热系数的确定

摘要

Surface comprehensive heat transfer coefficient,as the critical boundary conditions,will influence directly temperature field distribution in the quench process and influence the distribution of organization field,hardness field and stress field about quenched workpiece.It calculates surface comprehensive heat transfer coefficient between H13 and cooling medium by using the method of reversed heat conduction,which includes that making the curve by conducting an experiment during workpiece's quenching process as the boundary used in the H13 cutter ring heat conduct simulation,and comparing the practical cooling curve with predicted cooling curve,and using it in inverse heat transfer model of DEFORM,about and about,then gets the comprehensive heat transfer coefficient to provide reliable foundation for subsequent heat conduction.%表面综合换热系数作为关键边界条件直接影响淬火过程中的温度场分布,从而影响淬火后工件的组织场、硬度场以及应力场分布.采用反向热传导方法对淬火过程中H13和冷却介质之间的表面换热系数进行计算,通过实验测得工件淬火过程中的冷却曲线,并将其用于H13刀圈热处理仿真,导入DEFORM反传热模型中,对比换热系数预测的冷却曲线和实测冷却曲线,得出温度值基本吻合,确定综合换热系数,为后续热处理仿真的边界条件确定提供了可靠的依据.