固体润滑滚动轴承精度失效分析

发布时间：2018-06-20 03:42

本文选题：滚动轴承 + 固体润滑　；参考：《重庆大学》2012年硕士论文

【摘要】：随着我国航天、航空事业的进一步发展，固体润滑轴承的应用范围将迅速扩大。关于固体润滑轴承的失效形式、失效机理以及失效模型的建立，国内外做了很多研究，但很少有从精度的角度研究固体润滑轴承失效的。因此，针对固体润滑滚动轴承，分析固体润滑薄膜的接触力学性能，讨论润滑薄膜表面的应力分布规律及其与薄膜剥落转移之间的关系，进而从精度失效的角度分析固体润滑轴承的失效问题具有重要意义。论文的主要内容有以下三个方面： 1．论文结合摩擦磨损试验机和相关分析，对固体润滑滚动轴承接触问题进行简化，建立了滚珠与滚道间的二维弹性接触模型，采用有限元方法分析了接触载荷、摩擦系数、速度以及膜厚对接触应力场分布的影响，并讨论了应力分布与薄膜表面裂纹扩展之间的关系。分析表明保持在摩擦系数在较低的水平有益于改善薄膜表面的应力分布。 2．建立了粗糙表面的矩形弹塑性接触模型，分析了润滑膜材料属性对接触面积和接触压力的影响，讨论了粗糙峰数目与表面应力分布的关系。分析表明润滑膜材料属性和表面轮廓对接触面积和接触应力分布影响较大，分析结果对于研究润滑膜表面主动设计具有参考价值。 3．分析了固体润滑轴承镀膜误差或润滑膜发生剥落转移后所形成的误差对轴承回转精度的影响，建立了轴承回转误差评价模型，并进行了初步的实验验证和分析。结果表明轴承存在镀膜误差，，而且误差会复映到轴承回转精度上，造成轴承回转误差，严重时可能导致轴承回转精度失效。论文研究结论对于进一步研究固体润滑薄膜发生剥落转移以及从精度的角度分析固体润滑轴承失效问题具有指导意义和参考价值。
[Abstract]:With the further development of aerospace and aviation in China, the application of solid lubricated bearings will be expanded rapidly. Many researches have been done on the failure form, failure mechanism and failure model of solid lubricated bearings at home and abroad, but few researches have been done on the failure of solid lubricated bearings from the point of view of accuracy. Therefore, for solid lubricated rolling bearings, the contact mechanical properties of solid lubricating films are analyzed, and the relationship between the stress distribution on the surface of lubricating films and the flaking transfer of films is discussed. Furthermore, it is of great significance to analyze the failure of solid lubricated bearings from the point of view of precision failure. The main contents of this paper are as follows: 1. The contact problem of solid lubricated rolling bearings is simplified with friction and wear tester and correlation analysis, and a two-dimensional elastic contact model between ball and raceway is established. The effects of contact load, friction coefficient, velocity and film thickness on the distribution of contact stress field are analyzed by finite element method. The relationship between the stress distribution and crack propagation on the surface of the film is discussed. The analysis shows that keeping the friction coefficient at a lower level is beneficial to improve the stress distribution on the surface of the film. 2. A rectangular elastic-plastic contact model of rough surface is established. The influence of lubricating film properties on contact area and contact pressure was analyzed. The relationship between the number of rough peaks and the distribution of surface stress was discussed. The results show that the properties of lubricating film material and surface profile have great influence on contact area and contact stress distribution. The analysis results have reference value for studying the active design of lubricating film surface. 3. The influence of the error of solid lubricating bearing coating on the accuracy of rotary bearing is analyzed. The model of bearing rotation error evaluation is established, and the preliminary experimental verification and analysis are carried out. The results show that there is a coating error in the bearing, and the error will be reflected on the rotary precision of the bearing, resulting in the bearing rotation error, which may lead to the failure of the rotary precision of the bearing if it is serious. The conclusion of this paper is of guiding significance and reference value to further study the spalling transfer of solid lubricating film and to analyze the failure problem of solid lubricated bearing from the point of view of accuracy.
【学位授予单位】：重庆大学
【学位级别】：硕士
【学位授予年份】：2012
【分类号】：TH133.33

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