一、模具的三个特性模具要有三个特性:第一是没有残留奥氏体,否则会降低硬度;第二是没有残留应力,否则会产生时效变形和磨削裂纹;第三是要有热硬性。为了消除残留奥氏体和残留应力,可以使用三种方法:(1)加快冷却速度。(2)提高回火温度。(3)进行冷处理。有人认为对于冷作模具可以不考虑热硬性,这是错误的。因为现在的冲压速率很高,工 First, the mold of the three characteristics of the mold to have three characteristics: The first is no residual austenite, otherwise it will reduce the hardness; the second is no residual stress, otherwise it will have aging deformation and grinding cracks; the third is to have heat rigid. In order to eliminate residual austenite and residual stress, there are three methods that can be used: (1) to speed up the cooling rate. (2) increase the tempering temperature. (3) for cold treatment. Some people think that for the cold die can not consider the thermosetting, which is wrong. Because of the high stamping rate now, workers