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Micro fracture behavior of cutting edges in grinding using single crystal cBN grains

2008; Elsevier BV; Volume: 17; Issue: 7-10 Linguagem: Inglês

10.1016/j.diamond.2008.03.008

1879-0062

Masakazu Fujimoto, Yoshio ICHIDA,

Metal Alloys Wear and Properties

This paper presents a micro fracture behavior of the grain cutting edge that is the most important factor controlling the grinding ability of cBN wheels during the grinding process. To grasp a self-sharpening phenomenon due to the micro fracture of the cutting edges, the wear process in grinding with single crystal cBN grains has been observed using three-dimensional (3D) scanning electron microscope with four electron probes and the 3D-profile of the worn cutting edge has been evaluated by means of the fractal analysis. The fractal dimension for surface profile of the cutting edge formed by the micro fracture is higher than that of the cutting edge formed due to the ductile attritious wear. Therefore, an increase in the ductile attritious wear flat on the grain cutting edge results in a decrease of its fractal dimension. Moreover, the complicated changes in shape of the cutting edge due to the self-sharpening can be evaluated quantitatively using the fractal dimension.