局部淬火是热处理生产中广泛应用的一种工艺方法。通常情况下有如下两种类型:局部加热局部淬火与整体加热局部淬火。但由于需要处理的零件的形状、截面尺寸及技术要求多种多样,在空气电阻加热炉中难于完成较大截面尺寸的轴类零件的局部加热;而在盐浴炉中又难以实现具有三种以上硬度要求的较小截面尺寸的轴类、筒状等零件的淬火加热。 Local quenching is a widely used method of heat treatment production process. Under normal circumstances, the following two types: local heating local hardening and local heating local hardening. However, due to the need to deal with the shape of parts, cross-sectional size and technical requirements vary, in the air-resistance furnace difficult to complete the larger cross-sectional size of the shaft parts of the local heating; and in the salt bath furnace is difficult to achieve with three The above hardness requirements of the smaller cross-section shaft size, cylindrical and other parts of the quenching and heating.