Abstract: Aiming at the current situation of large distortion, difficult control of ellipticity, and high scrap rate after conventional quenching of carburized bearing rings, especially the outer ring of tapered roller bearings, a fixture induction hardening process equipment was proposed. It can not only correct the severe out of round of bearing ring after carburization, but also perform mold pressing hardening at the same time. The mass production test of the tapered roller bearing ring with an outer diameter of 72.25 mm was carried out. The results show that the elliptical distortion is limited to 0.09 mm, and the end face warping is limited to 0.03 mm. The microstructure, hardness and hardened layer depth can all meet the relevant requirements of JB/T 8881—2020, which can bring significant economic benefits to users.

Key words: bearing ring, fixture induction hardening, distortion