Patent ID: 9643291
Date: 2017-05-09
CPC Classifications: B24B,B24D

Claim:
1. A method for polishing a workpiece executed by a polishing device having a polishing tool, the method comprising the steps of: arranging the polishing tool on a lower shaft side of the polishing device, the polishing tool including: a polishing surface having a predetermined radius of curvature; and a hole that is provided inside the polishing surface and is concentric with an outer edge of the polishing surface around a rotation axis on a projection plane orthogonal to the rotation axis, wherein the polishing surface has a spherical zone shape, and a ratio of an outer diameter of the polishing surface to an inner diameter of the polishing surface is greater than 1.0 and equal to or less than 6.0, and a ratio of a spherical zone width of the polishing surface to an outer diameter of the workpiece is equal to or greater than 0.9; arranging only the workpiece on an upper shaft side of the polishing device; and swinging the polishing tool at a constant swing width with respect to a reference point while rotating the polishing tool around the rotation axis to polish the workpiece, wherein the reference point is provided at a position where a straight line, which passes through a center of the workpiece and intersects with the rotation axis, passes through a center of a spherical zone of the polishing surface in a width direction.