内齿圈(图1)材料为ZG 55 Ⅱ,模数为4mm,齿数为48,齿宽为40mm,分度圆直径为192mm,齿部硬度HRC33～43。对这样的零件,如用大功率的感应加热设备——高频淬火机床处理,比较易于达到设计和使用要求。但我厂没有这种设备,又缺乏齿圈淬火经验。在总结失败原因基础上,改进工艺方案,采用了加热后快速装夹淬火工艺,具 Ring gear (Figure 1) The material for the ZG 55 Ⅱ, modulus 4mm, the number of teeth 48, tooth width 40mm, pitch circle diameter 192mm, tooth hardness HRC33 ~ 43. For such parts, such as the use of high-power induction heating equipment - high-frequency hardening machine processing, easier to meet the design and use requirements. However, I plant without such equipment, but also the lack of gear quenching experience. On the basis of summing up the reasons for the failure, to improve the process plan, the use of rapid heating after clamping quenching process, with