表面微织构对关节轴承耐摩性能的影响

Effect of surface micro-textures on wear-resisting performance of joint bearings

针对关节轴承在大载荷、贫润滑等极端工况下发生的磨损失效问题,采用Fluent仿真研究不同形状、直径和间距的微织构对流体力学的影响,借助激光加工法进行织构化处理以获得试验所需表面,采用UMT TriboLab摩擦磨损试验机对304不锈钢表面摩擦磨损性能进行分析.结果表明:圆形、三角形和矩形微织构最大压力值依次为89600、82100和78900 MPa;圆形微织构动压润滑性能效果最好,三角形微织构次之,矩形微织构最差;微织构直径大于160μm时,摩擦系数减小趋势变缓,微织构间距为200μm时摩擦系数最小.

Aiming at the wear failure problem of joint bearings under the extreme operating conditions of large load and poor lubrication,the influence of micro-textures with different shapes,diameters and spacings on fluid mechanics was studied with Fluent software,and the textured processing was accomplished by a laser machining method to obtain the surfaces required for tests.In addition,a UMT TriboLab friction-abrasion testing machine was used for analyzing the surface friction and wear properties of 304 stainless steel.The results show that the maximum pressure values of circular,triangular and rectangular micro-textures are 89600,82100 and 78900 MPa,respectively.Therefore,the circular micro-texture has the best hydrodynamic lubrication performance,followed by triangular micro-texture,while the rectangular micro-texture is the worst.When the micro-texture diameter is greater than 160μm,the friction coefficient decreases slowly.When the micro-texture spacing is 200μm,the friction coefficient is the smallest.