零件热处理过程中产生的变形是不可避免的。但可以采用预先热处理方法,使变形减少到最低限度。现介绍几种采用预先热处理方法来减少零件淬火变形的实例,供参考。 [例1]图1所示的油泵齿轮,材质为40Cr钢,要求硬度HRC48～52,内孔变形要求为0.03～0.05mm。原来是将采购来的热轧圆钢加工成形,施行常 Part of the heat generated during the deformation is inevitable. However, pre-heat treatment can be used to minimize the deformation. Here are some examples of the use of pre-heat treatment to reduce quenching deformation of parts for reference. [Example 1] The oil pump gear shown in FIG. 1 is made of 40Cr steel and has a hardness HRC of 48-52 and a bore deformation requirement of 0.03-0.05 mm. The original is to be purchased from the hot-rolled steel processing and shaping, often used