Method for controlling surface hardness of bearing spacer ring

Abstract

The invention relates to a method for controlling the surface hardness of a bearing spacer ring, and belongs to the technical field of bearing spacer ring processing. The method for controlling the surface hardness of the bearing spacer ring comprises the following steps of carrying out primary machining on the surface of the bearing spacer ring; putting the bearing spacer ring into a mesh belt furnace, and carrying out carbonitriding heat treatment, wherein the heat treatment process adopts manners of rising the temperature in stages and heating symmetrically; and carrying out secondary machining on the heat-treated bearing spacer ring. According to the method for controlling the surface hardness of the bearing spacer ring provided by the invention, by adopting the treatment process combining primary machining, carbonitriding and secondary machining, the surface hardness of the bearing spacer ring is dynamically controlled, so that the surface hardness of a finished product and the thickness of a hardening layer are promoted to be uniform and within the tolerance range of the technical requirement, the occurrence of the phenomenon that the surface hardness is too low or too high is avoided, and the generation of batch wastes caused by unqualified surface hardness of the finished product is avoided.

Description

technical field [0001] The invention belongs to the technical field of bearing spacer ring processing, and in particular relates to a method for controlling the surface hardness of a bearing spacer ring. Background technique [0002] The bearing spacer is punched from low-carbon steel plate, and its surface hardness is mainly controlled by heat treatment, while the traditional heat treatment method is mainly realized by adjusting the quenching temperature and the flow rate of the atmosphere. However, when using the traditional heat treatment process to control the surface hardness of the bearing spacer ring, there are the following limitations: a) The effective hardened layer of the bearing spacer ring is required to be 0.10-0.25mm. The internal residence time is relatively long, about 90-120 minutes, and the surface hardness of the workpiece will be low after quenching, which cannot meet the technical requirements. b) The surface hardness of the bearing spacer is required ...

AI Technical Summary

Problems solved by technology

However, when using the traditional heat treatment process to control the surface hardness of the bearing spacer ring, there are the following limitations: a) The effective hardened layer of the bearing spacer ring is required to be 0.10-0.25mm. The internal residence time is relatively long, about 90-120 minutes, and the surface hardness of the workpiece will be low after quenching, which cannot meet the technical requirements

The traditional carbonitriding-quenching process leads to large dispersion in the surface hardness of the workpiece, and the phenomenon of high and low surface hardness often occurs, which cannot meet the technical requirements

c) When the sealing performance of carbonitriding equipment is poor, after carbonitriding for a long time, the phenomenon of low surface hardness of the workpiece after quenching is more obvious, often resulting in batch waste