Method for analyzing limit pretension force of angular contact ball bearing under fixed-position pretension of high-speed electric spindle

Abstract

A method for analyzing limit pretension force of an angular contact ball bearing under fixed-position pretension of a high-speed electric spindle belongs to the technical field of bearing pretension. According to the method, firstly, parameters including a bearing type, a working condition, maximum permissible stress of a material and the like are determined; secondly, based on a Hertz contact theory, the influences of pretension force, centrifugal force and gyroscopic torque of the bearing are considered, and a kinetic model of the angular contact ball bearing under the fixed-position pretension is established, wherein the kinetic model includes a contact region model of the angular contact ball bearing, a pretension model of the angular contact ball bearing in a static state of the spindle, and a pretension model of the angular contact ball bearing in a rotating state of the spindle; thirdly, a relation between the pretension force and maximum contact stress of a bearing rolling body and bearing inner and outer rings under the condition of rated speed is solved with a Newton method; and finally, the pretension force, i.e., the limit pretension force, of the bearing under the permissible stress of the material is analyzed out.

Description

technical field [0001] The invention relates to a method for analyzing the limit pre-tightening force of an angular contact ball bearing under positioning and pre-tightening of a high-speed electric spindle, and belongs to the technical field of bearing pre-tightening. Background technique [0002] The bearings of the high-speed electric spindle system generally use angular contact ball bearings, and the dynamic characteristics of the angular contact ball bearings directly affect the performance of the high-speed electric spindle system. In order to increase the rigidity of the bearing, improve the rotation accuracy, reduce vibration and noise, and prolong the service life of the bearing, it is necessary to preload the angular contact ball bearing. Positioning preloading is one of the main preloading methods of angular contact ball bearings. It uses pre-selected inner and outer ring spacers or washers to make the inner ring and outer ring of the assembled bearing in a fixed ...

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Problems solved by technology

However, the above studies neglected the influence of centrifugal force and gyro torque, and the established model was not accurate enough, resulting in errors between the obtained limit preload force and the actual situation.

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