Effect of Laser Textured Surfaces on the Frictional Property in Line Contact

In order to study the effect of surface topography on the frictional characteristics of friction pair under line contact elasto-hydrodynamic condition, by controlling the shape, depth, space and area density of micro texturing, two groups of specimens with the same surface arithmetic average height S_a were designed and manufactured by laser surface texturing. All the surfaces were measured by non-contact 3D optical profiler Talysurf CCI Lite and characterized by ISO25178 and connectivity coefficient. A series of rich oil frictional experiments were conducted on a JPM-1 two-disc tribo-tester and the friction coefficient under different load and different rotational speed conditions were measured. The results show that micro texturing, s shape, direction and depth have significant impacts on frictional characteristics in line contact. Forward arrow texturing showed the best frictional performance and friction coefficient showed a linear growth trend with the increase of the linear speed, and decreased with the increase of load. Three-dimensional characterization parameters of the surface morphology S_sk、S_ku、V_vv、V_vc、U_s had certain relevance with frictional characteristics.