Mechanism of Thermochemical-Mechanical Reactions between Nano-Polycrystalline Diamond and Polycrystalline Diamond Disk Generated under Dry Grinding

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A polycrystalline diamond (PCD) disk, in which the cobalt (Co) commonly used as a sintering aid is replaced with a transition metal or a high-specific-heat material, was used as a truer, and dry grinding of a laser-preformed rake face of a radius-cutting tool made of nano-polycrystalline diamond (NPD) was conducted to clarify the mechanism by which a chip is removed from the rake face. The grinding test revealed that the surface roughness decreased with increasing specific heat capacity of the material replacing the Co when the heat-damaged layer, in which the diamond structure was transformed to that of graphite, was removed by diamond grains on the working surface of the truer. A ground surface roughness of 0.5 nm Rz was obtained when the truer with Co replaced by boron carbide (B4C) was employed.