象图1那样的带轴齿轮,对热处理的要求是很高的:既要保证齿轮部分变形小,又要保证齿轮部分和轴部分达到要求的垂直度。对于这种齿轮在渗碳后的淬火,一般工艺规程规定先在电炉里加热,然后在油槽里冷却;结果就不能达到上进的要求。于是只好加大加工余量,通过机械加工来修整齿轮部分和轴部分,这样就给实际生产带来了很 As with the shaft gear in Figure 1, the heat treatment requirements are high: it is necessary to ensure that the gear part of the deformation is small, but also to ensure that the gear part and the shaft to achieve the required degree of verticality. For such gear quenching after carburizing, the general rules of the process first heated in the electric furnace, and then cooled in the tank; the result can not meet the advance requirements. So he had to increase the machining allowance to trim the gear part and the shaft part by machining, thus bringing the actual production