圆柱形表面微坑阵列对点接触润滑摩擦性能的影响

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.

Effect of the Patterned Cylindrical Dimple Array on the Tribological Performance of Lubricated Point-contacts

This paper presents the experimental results for oil lubricated ball/disc point-contact with prepared patterned dimples on functional surface.The patterned dimples are produced by mircosecond laser and characterized by the Dual Mode 3D Profilometer.Tribological experiments are conducted on the commercial UMT-Ⅲ tribo-meter.Stribeck-like curves are obtained to depict the transition of lubrication regime and electrical contact resistance is utilized to qualitatively characterize the lubrication regime.The test results show that compared with the non-textured surfaces,the friction coefficient firstly decreases then increases when the dimple depth is reduced from 30 μm to zero,and gets minimal value at about 10 μm.The coverage ratio and size of the patterned dimples also have effect on the friction coefficient under lubricated point-contact conditions.It can be found that there exist optimal dimple parameters for reduction of friction coefficient.