Abstract: Mesh belt furnace is often used for heat treatment of deep groove ball bearings. The structure of mesh belt furnace oil groove, viscosity of quenching oil and cooling rate have great influence on the quenching distortion of bearings. Based on 6206/01 bearing ring, the mechanism of taper distortion was discussed. The results show that the taper distortion of bearing ring in heat treatment has a great correlation with the uniformity of quenching and cooling. When the turnover speed of small mesh belt is adjusted to 15 s, the uniformity of quenching and cooling of bearing ring can be improved, and the taper distortion of 6206/01 bearing ring can be better controlled. It can also be used for reference to other specifications of bearing rings.

Key words: bearings, taper distortion, quenching oil, turning time