面接触条件下织构表面摩擦特性研究

Frictional Properties of Textured Surfaces under Plane Contact

为研究织构表面对面接触摩擦副摩擦特性的影响,设计和制造4个表面高度算术平均值相同、表面微凹坑面积占有率分别为7%、14%、21%、28%的试件,选用HDM20端面摩擦磨损试验机,针对油润滑和脂润滑两种润滑剂,在不同载荷、转速等工况和不同摩擦副配对材料等条件下进行了试验研究,探讨表面形貌对摩擦特性的影响规律,并使用Talysurf CCI Lite非接触式三维光学轮廓仪对试样进行三维表面测量,采用ISO25178定义的体积参数和连通性系数对三维表面形貌进行表征,从而得出表面体积参数及连通性系数与摩擦因数的关系。结果表明:在油润滑条件下表面形貌的微观结构特性对摩擦的影响要比脂润滑条件下的更显著;在钢对铜摩擦副条件下织构表面的摩擦因数变化比较复杂,在钢对钢摩擦副条件下织构表面的摩擦因数变化相对平稳;在不同的条件下,最优的表面微观结构特性也不同;将连通性系数和体积参数结合起来对表面形貌进行表征将更有利于表面微观结构特性的摩擦学设计。

In order to study the influence of textured surfaces on the tribological properties of plane contact friction pairs,four specimens are designed and manufactured which have the same surface arithmetic average height,and the area density of microcavity are 7%,14%,21% and 28% respectively.A series of frictional experiments for oil lubrication and grease lubrication with operating conditions of different load,velocity and different material are conducted on a HDM20 end-face contact tribo-tester.The effect of surface topography on frictional property is investigated.The 3D surfaces of the specimens are scanned by Talysurf CCI Lite Non-contact 3D optical profiler and characterized through volume parameter in ISO25178 and connectivity parameter.The correlation between characterization parameters and friction coefficient is given.The results show that the influence of micro-structure characteristics of surface topography on friction under oil lubrication is more remarkable than that under grease lubrication.The change of the friction coefficient of textured surfaces is complex under the condition of steel-copper friction pair,but smooth and steady under the condition of steel-steel friction pair.The optimal micro-structure characteristics of surface topography are different under different conditions.It is beneficial for the tribological design of micro-structure characteristics of surface topography to characterize the surface topography through the combination of connectivity parameter and volume parameter.