| 摘要 |
PROBLEM TO BE SOLVED: To shortly, sharply and precisely process the edge of a polygonal workpiece. SOLUTION: A grinding wheel 3 is reciprocated in an X-axial direction while rotating the workpiece 2 around a C-axis in one direction, for grinding one plane 2a of the workpiece 2. After grinding an edge P at the terminal of the plane 2a, the grinding wheel 3 is isolated from the workpiece 2. The grinding wheel 3 is reciprocated in a region in no contact with the workpiece 2 and the workpiece 2 is continuously rotated in the same direction. At this time, the grinding wheel 3 is moved with respect to the edge P while drawing an approximately elliptical locus swelling to the outside. At a position where the contact plane of the grinding wheel 3 corresponds to the next plane 2b of the workpiece 2, the grinding wheel 3 is put in contact with the edge P at the starting end of the next plane 2b. Then, the grinding wheel 3 is reciprocated while continuously rotating the workpiece 2 in the same direction, for grinding the next plane 2b of the workpiece 2.
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