| 摘要 |
PURPOSE:To remove not only a concave workpiece but the center of the workpiece in an accurate manner, by rotating a polishing tool having a spherical part around the center axis, and pressing a speedy part in peripheral speed apart from the center of the polishing tool, to the workpiece for polishing while rotating the workpiece. CONSTITUTION:A speedy part, in peripheral speed, apart from the central axis of a spherical polishing tool 3 is pressed to a workpiece 1 and polished while rotating the workpiece 1, and such a rock as within 0.1-1sec in period and 1mm in amplitude is given to at least one side of the workpiece 1 or the polishing tool 3. With this constitution, such a possibility that a turning center 4 of the tool comes to a dead point and a work part is left unpolished or a turning center 2 of the workpiece 1 is projected and left behind will not occur there, and even in case of the workpiece in a concave form, it is easily polishable. In addition, if such a polishing tool as consisting of hard resin of bakelite, acrylic resin, nylon resin, etc., in a Young's module of 300-1,500kg/cm<3> is used, the workpiece comes to small in surface roughness and, what is more, it is made into mirror finishing less in a machining flaw.
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