To provide a centerless grinding method and device for a different diameter workpiece 18 capable of performing stable grinding with high precision even when a cylindrical long part which is a ground surface, is smaller than the diameter of a cylindrical part 2, in grinding the different diameter workpiece 18, and efficiently and precisely eliminating a burr 4 formed after cutting a part, by grinding.
In centerless grinding of the different diameter workpiece 18 comprising a large diameter cylindrical part 2 and a small diameter bar-like stem part, a receiving surface of a bearer of the stem part is formed in semicircular or circular shape to prevent micro bending of the workpiece 1 caused by low rigidity in addition to the diameter of the cylindrical part 2 of the different diameter workpiece 18 being smaller than a grinding width, and to stop the micro movement of the workpiece 1 during grinding, and fixing is ensured using force applied to the workpiece 1 by the turning force of a controller 7 and a grinding wheel 6, thus permitting stable centerless grinding. Further, working time and a failure rate are reduced by positively and precisely eliminating the burr 4 formed at a cutout 3 of the cylindrical part 2.
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