| 摘要 |
A rotary tool T comprising a rotator 10 having a surface opposite to a plane being machined, and a plurality of cutting parts 20 arranged on the opposite surface, and ensuring a good work for removing a coating by preventing seizure while avoiding undue biting of a tip. The cutting part 20 is composed of a grindstone 22 produced by bonding abrasive grains by a metallic binder at the inner part in the direction of turning radius of the tip, and of a sintered body 24 harder than the grindstone 22 at the outer part in the direction of turning radius thereof. The rotary tool T comprises tips 22a each composed of a grindstone produced by bonding abrasive grains by a metallic binder, and tips 24a each composed of a sintered body harder than the grindstone, wherein the cutting parts 20 are arranged such that the tips 24a are located on the outside of the tips 22a in the direction of turning radius of the rotator.
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