在热态下工作的锻、镦、拉、挤、压模,它们的工作表面要承受反复的加热和冷却,成型越慢,受热越甚,热应力越大;同时还要反复承受不同程度的机械应力。因此,热作模具在一般情况下的失效形式,除磨损外,就是由这种反复热应力、机械应力所造成的疲劳破坏。根据锻件形状,可以凭经验估计模具容易出现这些损坏的部位见图1。锻件塑性变形显著的部位容易磨损;锻件与模具 Forging, upsetting, drawing, extruding and pressing working in the hot state, the working surface of the working body is subjected to repeated heating and cooling. The slower the forming process, the more the heat is applied and the greater the thermal stress. At the same time, Mechanical stress. Therefore, hot work die in the form of failure under normal circumstances, in addition to wear and tear, is the result of repeated thermal stress, mechanical stress caused by fatigue damage. According to forgings shape, you can empirically estimate the mold prone to these damaged parts shown in Figure 1. Forging significant deformation of plastic parts easy to wear; forgings and molds