| 摘要 |
PURPOSE:To prevent the generation of fissure and crack due to grinding pressure by filling up 60-400 mesh sand in the gap between a grinding jig shaft part and the work outer-fitted thereto, fastening a nut, holding a work and grinding it by fitting between both centers. CONSTITUTION:A cylindrical work 5 consisting of a hard brittle stock is fitted into the shaft part 1a of a grinding jig 1, the left end is abutted to a step part 1b and the work 5 and shaft part 1a are positioned almost co-axially by providing an intermediate step part 1d of slightly smaller diameter than the inner diameter of the work 5 on the step part 1b. It is then erected vertically so that the right end becomes up, the sand 4 in 60-400 mesh grain size is flowed into the gap between the work 5 and shaft part 1a and filled up densely, a nut 3 is fastened by screwing with a screw 1c via a washer 2 and the work 5 is held. The grinding jig 1 is fitted between a rotary center 7 and dead center 8, a grindstone 6 is pressed to the outer periphery of the work 5 by turning the jig 1 via a projecting part 9 and the work 5 is ground. |
