论文部分内容阅读
采用激光工艺加工圆柱形表面微孔阵列,并采用三维表面形貌仪表征形状特征和形貌,在摩擦磨损试验机(UMT-Ⅲ)上进行球盘点接触摩擦学试验,研究微坑阵列对点接触润滑摩擦性能的影响.采用Stribeck曲线表征润滑状态的转变,并辅以接触电阻定性表征摩擦副所处的润滑状态.结果表明:微坑深度对点接触润滑摩擦性能有显著影响,随微坑深度从30μm减至0,摩擦系数呈先降低后升高的变化趋势,在本文试验条件下微坑深度为10μm左右时,摩擦系数较光滑表面低,并达到最小.同时,微坑的大小和面积比对摩擦系数也有明显的影响,并同样呈现先减小后增大的趋势.因而存在优化的微坑以达到减小摩擦改进润滑的目的.
The micro-pore array of cylindrical surface was fabricated by laser process, and the shape and morphology were characterized by three-dimensional surface profilometer. The ball-point contact tribological test was carried out on the tribological tester (UMT-Ⅲ) The results show that the depth of micro-pits has a significant effect on the tribological properties of point-contact lubrication, and with the micro-pits When the depth of micro-pits is reduced from 30μm to 0, the coefficient of friction decreases firstly and then increases. Under the experimental conditions, the friction coefficient is lower than the smooth surface and reaches the minimum when the micro-pits depth is about 10μm. Meanwhile, The area ratio also has a significant effect on the friction coefficient, and also shows the tendency of decreasing first and then increasing, so there is an optimized micro-pits in order to reduce the friction and improve the lubrication.