激光微造型尺寸对滑动轴承表面摩擦特性的影响

Investigation of laser surface micro-texturing size on the tribological properties of sliding bearing

为了研究表面微造型对滑动轴承摩擦特性的影响,设计和制造了4组表面微造型尺寸不同的滑动轴承轴颈表面形貌。使用三维光学轮廓仪对微造型试件表面形貌进行扫描及测量,采用ISO25178定义的表面形貌参数对轴颈表面形貌进行表征。采用改造的摩擦试验机进行摩擦磨损试验,研究了表面形貌参数与摩擦系数之间的关系。结果表明:摩擦系数、摩擦副磨损量均随着表面微造型尺寸的增大先减小后增大,在微造型尺寸为160μm时最小。摩擦系数随着表面偏态增大而增大,随着表面谷处平均空体体积增大先减小后增大,随着封闭山峰体积的增大先增大后减小。

In order to study the effect of surface micro-texturing on the tribological properties of the sliding bearing under the oil lubrication condition,four types of the specimens were designed and prepared which had the different micro-texturing size. The surfaces topography were measured by the surface profiler and characterized with the surface parameters defined in ISO25178. Friction experiments were conducted by the modified tribological tester. The correlations between the surface parameters and the friction coefficient were studied. The results showed that with the increase of surface micro-texturing size,the friction coefficient and the weight loss of friction pair were all first decreased and then increased,and were the smallest for the micro-texturing size of 160 μm. The friction coefficient was increased with the increase of the skewness of the surface height distribution,was first decreased then increased with the increase of the average void volume of the surface valley area,and was first increased then decreased with the increase of the average volume of the surface peak.