ABSTRACT: Through observing the microcosmic image and back-scattered three-dimensional picture of the ground surface of polycrystalline diamond(PCD), this paper studied the grinding mechanism of PCD material. The research results showed that the shock-brittle removal, fatigue-brittle removal along crystal boundary, fatigue-corrosive-brittle removal in dots, heat-chemical removal and machinery-heated removal would occur in the grinding process of PCD material. The primary and secondary sequence of these removal fashions depend on the grinding parameters. Because the sawtooth-style edge, defects often appear in the fashion of shock-brittle removal, this removal fashion should be kept away from the grinding process of the PCD material.

KEYWORDS: polycrystalline diamond, tool, grinding, mechanisms