为了获得热冲压板料和模具的界面换热系数,本文通过设计圆台实验分别获得热冲压淬火过程中5、10、20、30和40 MPa保压压强时的板料中心降温曲线和模具模面中心向下1.5 mm处的升温曲线.在考虑模具热电偶温度响应时间和板料由奥氏体向马氏体转变的相变潜热影响基础上,提出运用有限元反算求解界面换热系数的方法,进而获得界面换热系数与保压压强的对应关系.结果表明,界面换热系数值与压强近似呈直线关系,使用该方法时板料与模具的模拟温度曲线和实验温度曲线的相对误差可控制在15％以内,且二者的平均绝对误差最大不超过24 ℃.
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