Bearing assembly dimensional stability control method

Abstract

The invention discloses a bearing assembly dimensional stability control method. The bearing assembly dimensional stability control method comprises the following steps of first, carrying out heat treatment on a bearing ring or rolling element; second, carrying out grinding and polishing on the upper end surface and the lower end surface of the bearing ring or rolling element subjected to heat treatment; third, placing the bearing assembly into an impulse current generator, starting up the impulse current generator, reasonably setting the impulse current intensity and the number of times for continuously inputting electric impulses according to the dimensions and the material characteristics of the bearing assembly, and carrying out impulse current treatment at the room temperature; directly carrying out multiple-time continuous impulse current treatment when the part subjected to heat treatment is the rolling element; and when the part subjected to heat treatment is the bearing ring,evenly dividing the part of the bearing ring into a plurality of subzones in the circumferential direction, and carrying out multiple-time continuous impulse current treatment on each subzone of the bearing ring. With the bearing assembly dimensional stability control method, the dimensional stability of the bearing assembly can be effectively controlled by having control over the residual stressand the retained austenite content of the bearing assembly, and the service life of a bearing is obviously prolonged.

Description

technical field [0001] The invention belongs to the technical field of bearing manufacturing, and in particular relates to a method for controlling the dimensional stability of a bearing assembly. Background technique [0002] As an important supporting component in mechanical equipment, bearings are widely used in automobiles, aerospace, heavy machinery and other fields. The basic structure of a bearing is composed of a ring (including an inner ring and an outer ring), rolling elements and a cage. Among them, the ring and rolling elements are the core components of a rolling bearing that are actively loaded and most likely to fail, and their comprehensive performance is directly related to the bearing's performance. service life. [0003] In order to improve the performance of bearing components (rings and rolling elements), it is usually necessary to modify their shape through forging and heat treatment. However, different degrees of internal stress will be generated in ...

AI Technical Summary

Problems solved by technology

Among them, retained austenite is an important metastable structure, once it is transformed under the action of temperature and load, it will cause a small change in the size of the bearing assembly, thus affecting the dimensional accuracy and life of the bearing

[0004] In view of the above reasons, the residual stress and structural stability of bearing components have become the key issues affecting the life of bearings, but they have not been effectively solved

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