Edge-chipping generation of ferrite in slot grinding

The purpose of this investigation is to clarify the edge-chipping generation-mechanism of ferrite in slot grinding. By releasing the grinding wheel quickly from the contact zone during the grinding operation, changes of edge-chipping size and of kerf width are measured. Edge-chipping size tends to decrease greatly in the grinding zone, while kerf width tends to increase greatly in the same zone. The changes of edge-chipping size and of kerf width are opposite. The sum of edgechipping size and kerf width in the grinding zone shows a nearly constant value. It is seemed that the initial chipping which occurred at the tip of ground groove is continuously ground with small depth of cut by the side of the grinding wheel and that the initial chipping tends to be decreased by an increase of kerf width. Especially, in down cut and low work speed the apparent function of increasing of kerf width is shown.