Research On Grinding Technology And Cutting Performance Of PCD Tools

With the rapid development of modern industry and technology, the polycrystalline diamond (PCD) tool is used widely in the automotive industry, aerospace industry and woodworking field due to its excellent properties. But its super hardness and high wear-resistance make itself difficult to be grinded. Its grinding efficiency is low and grinding cost is high, which result in the inacceptable high price by the clients. As the grinding mechanism with different wheel bonds including metal bond, resin bond and vitrified bond is different, the effects on the tool grinding quality are dissimilar too in the mechanical grinding, and so grinding wheels are selected blindly at the present time. The PCD cutting tool is one of the most ideal tools in cutting nonferrous metal, the selection of tool geometries is different from the common tools, which brings some puzzlement to the end users. This paper studies the grinding technology and cutting performance of PCD tools in detail, so it can provide some instructional meaning to the application of PCD tools in production practice.At first, through orthogonal experiment of grinding the PCD material by diamond grinding wheel, the influences of grinding parameters on removal rate and grinding ratio were investigated, and the regressive formula was founded. Secondly the paper presented blade microcosmic characteristic of PCD tools grinded by grinding wheels with different bonds through scanning electron microscope, and the effects of wheel bonds on grinding quality were analyzed, and simultaneously through cutting experiments of aluminium alloy and copper alloy, the effects of wheel bonds and cutting parameters on cutting surface roughness were analyzed. The results indicated that, the blade and flank surface of PCD tools grinded by grinding wheel with vitrified bond were better than others, the best surface quality can be acquired in cutting experiments of aluminium alloy. Next the geometric variables including rake angle, relief angle and nose radius of the tool were changed respectively through single factor cutting experiments of aluminium alloy, then the cutting force components were acquired by the Kistler dynamometer, subsequently the effects of tool geometries on cutting process were analyzed through extensive data. Finally, the modeling procedure based on the grey forecasting model GM (1,1) which is applicable to original series with equal intervals was introduced, and then an output model of Chinese synthetic diamond was established.