STUDY ON THE TRANSITION PROCESS OF DIAMOND GRAIN SHAPE IN STONE GRINDING

The edge fracture of a diamond grain plays an important role in heavy grinding such as stone grinding, in which the self-dressing action of the diamond grain keep up the edge sharpness and the stock removal. In order to analyze the variation of the edge shape distribution of a di amond grain during grinding, a new analysis method applying the theory of the Marcov Process is proposed. The results are summarized as foll ows: (i) the diamond grains have large probabilities of transition to a sharp edge and small fracture onset probabilities, hence a high cutt ing ability is maintained in steady state; (ii) the disappearance onse t probabilities of diamond grains don't depend on the edge shape; and (iii) these probabilities made it possible to evaluate transition proc ess of the shapes of diamond grains.