Abstract: To address the issue that the machining precision of finished thin-wall gear rings fails to meet the design requirements, this paper conducts a systematic analysis and research on machining processes such as semi-finished gear hobbing, as well as heat treatment processes including quenching and tempering treatment and nitriding treatment, aiming to improve the precision of finished gear rings. Through investigation, it is found that there is instability in the implementation of the quenching and tempering process. Meanwhile, after sorting out and optimizing links such as temperature control, furnace loading method, and post-furnace cooling in the nitriding treatment, the key risk factors are identified. Improper control of the temperature and concentration of the quenching medium in the quenching and tempering treatment, excessively fast heating rate, excessively high nitriding temperature in the nitriding process, and the adoption of rapid water quenching for cooling after furnace removal. All these factors increase the risk of gear ring deformation. Based on this, the research formulates targeted improvement measures, and ultimately enables the finished product precision to successfully meet the design requirements, providing a referential technical path and practical basis for the systematic solution to the precision problem in thin-wall gear ring nitriding treatment.

Key words: ring gear; quenching and tempering; nitriding; precision

摘要： 针对薄壁齿圈加工成品精度不达设计要求的问题，文章通过对半成品车齿等机加工过 程，以及调质处理、氮化处理等热处理过程展开系统分析研究，旨在提升成品齿圈精度。经 排查发现，调质处理工艺在过程执行中存在不稳定性，同时对氮化处理中的温度控制、装炉 方式、出炉后冷却等环节进行梳理与优化后，明确了关键风险因素。调质处理中淬火介质的 温度与浓度控制不当，氮化处理过程中升温速度过快、氮化温度偏高，且出炉后采用淬水快 速冷却的方式，这些因素均会增加齿圈变形风险。基于此，该研究制定了针对性的改进措施， 最终使成品精度成功满足设计要求，为薄壁齿圈氮化处理精度问题的系统解决提供了可借鉴 的技术路径与实践依据。

关键词: 齿圈；调质处理；氮化处理；精度