关键词: 齿圈；调质处理；氮化处理；精度

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