Patent ID: 8197305

Claim:
A coolant dynamic pressure releasing method in a grinding operation, comprising the steps of: grinding a workpiece by rotating the workpiece and infeeding a rotating grinding wheel against the rotating workpiece such that a grinding surface of the grinding wheel contacts the workpiece to define a contact surface where the grinding wheel contacts the workpiece, wherein the grinding surface of the grinding wheel comprises a plurality of oblique grooves inclined by a predetermined angle relative to a grinding wheel circumferential direction, at an equiangular interval, wherein where one side intersection point is defined as an intersection point of each oblique groove and an extension line of one side edge of the contact surface parallel to the grinding wheel circumferential direction and the other side intersection point is defined as an intersection point of each oblique groove and an extension line of the other side edge of the contact surface, each oblique groove, in a portion thereof between the one side intersection point and the other side intersection point, overlaps an oblique groove next to each such oblique groove, in a portion thereof between the one side intersection point and the other side intersection point, by a predetermined overlap amount in the grinding wheel circumferential direction; supplying coolant toward the contact surface; and infeeding the grinding wheel against the workpiece by an amount such that the length, in the grinding wheel circumferential direction, of the contact surface becomes shorter than the overlap amount.