| 摘要 |
PROBLEM TO BE SOLVED: To allow a polishing disk using a polishing sheet to combine a performance optimum for polishing and grinding the surface of a workpiece and a performance suitable for polishing and grinding inside the corner portion of the workpiece. SOLUTION: A first polishing sheet 3 folded in the middle is inserted into a slit 7 provided on the outer circumference of a base plate 2 in a manner that one piece 3a out of opposing two pieces is arranged on the front surface side of the base plate 2 and the other piece 3b on the back surface side, and part of the opposing two pieces protrudes radially outward from the base plate 2. A second polishing sheet 4 is inserted between the one piece 3a on the leading side and the one piece 3a on the trailing side in the rotation direction of the disc. Using bond 5, the base portion 4a of the second polishing sheet is bonded on the front surface of the base plate 2, vicinity of the insertion portion of the first polishing sheet 3 into the slit 7 is bonded on the base plate 2, and the inner surface of the other piece 3b of the first polishing sheet is bonded on the back surface of the base plate 2 and an adjacent overlapping surface with the other piece, so as to constitute the polishing disk 1. COPYRIGHT: (C)2011,JPO&INPIT
|
