| 摘要 |
PURPOSE:To prevent a grinding burn and to reduce the generation of a pluck and crack by providing plural grinding liquid feeding holes for injecting a grind ing liquid to the side face and outer peripheral parts of a cutting grindstone with their penetration from the outer peripheral part of a cover into the inner peripheral part with the use of a grinding liuqid forcibly feeding device from the external part of the cover. CONSTITUTION:A cover 11 surrounding the side face part and outer peripheral part of a cutting grindstone 15 is provided by its approaching to the cutting grindstone 15 and a work 16 immediately before the cutting grindstone 15 approaching to the work 16 and the grinding liquid layer 19 is formed in the gap of this cover 11 and cutting grindstone 15. The grinding liquid 17 injected from a work liquid feeding hole 12 is then surrounded by the cover 11 at its circumference, moreover because of the gap on the surface of the work 16 and this cover 11 being small, it is filled up in the gap of the cover 11 and cutting grindstone 16 to form the layer 19 of the cutting liquid. The air layer 18 accompanied by the rotation of this cutting grindstone 15 is cut off by the layer 19 of this grinding liquid at the cover 11 passing time of the cutting grind stone 15. A grinding burn is thus prevented. |
