Abstract
This paper describes the micro self-sharpening of cutting edges in cBN grinding. Plunge surface grinding experiments using a vitrified cBN wheel mounted a replaceable cBN segment into its peripheral side have been performed to observe the wear behavior of cBN grain cutting edges using a multiprobe SEM. The wear flat on the cutting edge is enlarged by ductile attritious wear and micro fracture that are repeated alternately. Therefore, a smooth surface due to ductile attritious wear and a rough surface due to micro fracture exist together on the wear flat. The size of the micro fracturing occurred on the wear flat ranges from 0.1 to 10 μm. Self-sharpening due to the micro fracture without a reduction in radial height of the cutting edge, that is, ‘micro self-sharpening’, takes place on the wear flat plane during grinding.
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