POLISHING TOOL, POLISHING TOOL HOLDING DEVICE, POLISHING DEVICE, AND COMBINATION POLISHING METHOD FOR PROCESSING POLISHING TOOL

摘要

PROBLEM TO BE SOLVED: To provide a low-cost polishing tool assuring a high spherical accuracy generated by a combination processing. SOLUTION: A polishing tray 1 using a polishing seat 2 as a polishing surface has a band-shaped projection 3 on the back surface of the polishing surface, and in its center hole 3a a column 11a fixed to an upper form 11 of a tray holding jig 10 is inserted and fastened by a screw 12a. The level adjustment of the tray 1 is made by loosening the screw 12a and changing the inserting depth of the column 11a to the projection 3. Eventual production of a dint on the column 11a caused by the screw 12a may be cleared by replacing only the column 11a. A pin receptacle 4 for use in the combination processing of the tray 1 is formed at the bottom of the center hole 3a in the projection 3, and owing to a large combine fulcrum angle at the time of combination processing, it is possible to enhance the accuracy and stability of the combination processing.