几何加工精度对气体动压径向轴承性能的影响

Effect of Manufacturing Errors on Performance of Gas Lubricated Journal Bearing

在保证轴承性能的前提下，如何减少轴承加工成本是每个轴承设计者所关心的问题。本文主要针对加工精度对全圆周光滑气体动压径向轴承性能影响进行了分析，列举了几种加工轴承孔的常用方法在一般工艺条件下所能达到的精度。简要讨论了影响轴承零件加工精度的因素。针对主要的加工误差：圆度误差与圆柱度误差对轴承性能影响作了气体润滑有限元分析，建立了一种考虑圆度误差及圆柱度误差影响的气膜厚度分布综合表达式。分析表明，加工误差对轴承性能的影响与误差的种类及参数有关；合理的圆度及圆柱度加工误差应控制在平均气膜厚度的２０％～３０％左右。

It is a common problem for every bearing designer to reduce the machining cost without lowering the bearing performance. In this paper,the effects of manufacturing errors on the performance of gas lubricated journal bearings are analysed.The economic accuracy of machining process,which is usually used for bearing housing finish machining,is presented. After that the factors which effect the machining accuracy are discussed.The effects of main machining errors,round error and cylindrical error,on bearing performance are analysed by finite element method. An error distribution formula is presented,in which both round and cylindrical errors are considered. It was shown that the effects of machining errors on bearing performance are related to the error type and parameters,and the acceptable round and cylindrical machining errors should be controlled in the range of 20%30% of the average film thickness.