The Experimental Study On Precision Grinding Mechanisms Of Nanostructured WC/Co Coatings

Nanostructured ceramic coatings is a novel class of engineering material in recent years, its fine properties make it have very extensive application perspective in industry. This paper deals with the precision grinding mechanisms for nanostructured ceramic coatings (n-WC/12Co). Through experimential investigation, theoretical modeling and analysis, precision grinding mechanisms for nanoatructured ceramic coatings(n-WC/12Co) are discussed. The results add a great value to the nanoatructured ceramic coatings in terms of industrial application.Firstly, based on the literature reviews, this paper puts forward the preliminary analysis for the grinding mechanisms of nanoatructured ceramic coatings, as well as the train of thought for studying it. The paper comprehensively introduces the scheme for the experimental study in grinding of nanoatructured ceramic coatings.In present paper, the precision grinding process of thermally sprayed nanostructured ceramic coatings (n-WC/12Co) with diamond wheel is studied in detail. The effect of grinding parameters such as grinding depth of grinding wheel, feedrate, bond type as well as wheel grit size on grinding force, grinding force ratio, specific grinding energy, surface roughness, surface damages and subsurface damages are analyzed. Different grinding force models have been established for single abrasive grits at different stages of the grinding process. The theoretical model of grinding force involves grinding depth of grinding wheel, feedrate, speed of grinding wheel, as well as the break-in force of the material. It turns out that grinding force increases with the depth of cut and federate. The abrasive grits of the grinding wheel and the tribological interactions of bond/chip/workpiece surface in the grinding zone both have an effect on the grindability. There is a proper range of grinding depth and feedrate for getting lower ground surface roughness.This paper reviews the three kinds of material removal mechanisms in grinding of ceramic. Based on the experimental result of grindability, combined with SEM observations of the ground surface and subsurface of-II-nanostructured ceramic coatings (n-WC/12Co), material removal mechanism including inelastic deformation and brittle damage of nanostructured ceramic coatings (n-WC/12Co) are revealed. In most grinding conditions, the predominate material removal mechanism of grinding nanostructured ceramic coatings (n-WC/12Co) is inelastic deformation.