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分级淬火也称热浴淬火,既可保证工件获得高硬度,又可使工件避免开裂,不发生或很少产生变形。现将分级冷却方法举例说明于后: (1)油泵齿轮分级淬火图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。原来是用热轧圆钢加工成形,施行常规处理工艺,使φ16mm孔变形量达0.08～0.12mm,内键槽涨大,造成废品
Classification quenching, also known as hot bath quenching, both to ensure that the workpiece to obtain high hardness, but also to avoid cracking the workpiece, does not occur or rarely produce deformation. The classification cooling method is illustrated below: (1) oil pump gear classification quenching gear pump shown in Figure 1, the material is 40Cr steel, the required hardness HRC48 ~ 52, bore deformation requirements of 0.03 ~ 0.05mm. The original is the use of hot-rolled steel processing and forming, the implementation of conventional processing technology, the deformation of φ16mm hole volume 0.08 ~ 0.12mm, the keyway up, resulting in waste