UVアシスト研磨によるCVDダイヤモンド膜付超硬工具切れ刃の鋭利化と切削性能評価

概要

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CVD diamond film coated carbide tools have been widely used for the non-ferrous metal cutting. The cutting edges of CVD tools have large radii and rough surface due to the microstructure of the polycrystalline diamond particles. Consequently, the precision polishing process is strongly required to obtain CVD tools with sharp edge and polished flank and rake faces. This paper provides an application result of novel UV-polishing process on CVD diamond film. The UV (Ultra-violet ray) irradiation assisted polishing method was developed in our laboratory to achieve the ultra-smooth polished substrates of diamond and SiC. CVD tools with well-polished rake or flank face and sharp cutting edge surface were obtained by the UV-polishing. Four types of cutting tools were prepared by selective UV-polishing on rake or flank faces, and were applied to cutting tests of an aluminum alloy A5052. The UV-polishing of rake and flank face showed superior cutting performance with good surface roughness and low cutting forces. The frictional efficiency between flank and work material surface was decreased by UV-polishing of flank face. These results suggest the high potential of ultra-precision cutting using CVD diamond film coated tools sharpened and polished by the UV-polishing.
公益社団法人精密工学会の論文