关键词: 超音速火焰喷涂技术, WC-17Co涂层, 高速磨削, 砂轮

Abstract: By studying the effects of diamond grinding wheels and grinding process parameters on grinding force, grinding temperature, residual stress, surface microscopic morphology and surface roughness, the relationship between the maximum undeformed chip thickness and the specific grinding energy was researched and grinding removal mechanism of the HVOF sprayed WC-17Co coating was revealed under the conditions of high speed grinding. The influences of grinding temperature on residual stress in the WC-17Co coating workpiece were analyzed. The normal grinding force was discussed on the effects of the subsurface damage in the WC-17Co coating workpiece. The research results show that grinding removal mode of the HVOF sprayed WC-17Co coating is both of ductile and brittle. When the grinding wheel velocity is increased, the grinding forces decrease quickly before rising slowly，and the grinding temperatures are continued to rise, and the residual stress state changes from compressive stress to tensile stress, and the coating removal mode transforms from brittle fracture to ductile removal by degrees, the plastic deformation of the coating caused by high grinding temperature is the main cause of the transition of residual stress state. With the normal grinding force increases, average depth of subsurface damage layer of the coating becomes bigger. Increasing grinding wheel speed, reducing workspeed and depth of cut, the proportion of plastic removal of the coating may increase.

Key words: high velocity oxy-fuel（HVOF） spraying, WC-17Co coating, high speed grinding, grinding wheel