| 摘要 |
PROBLEM TO BE SOLVED: To strongly hold a thip for chamfering on a holding member in a drilling tool for storing the holding member holding the thip for chamfering within a storing part provided in depressed manner on an outer peripheral part of a tool main body and deburring and chamfering a peripheral edge of a hole by the thip for chamfering at the same time as drilling. SOLUTION: In the boring tool for storing the holding member 30 holding the thip 20 for chamfering within the storing part 12 provided in depressed manner on the outer peripheral part of the tool main body 10 provided with a cutting edge 11 at a tip, energizing the holding member 30 by an energizing member 40 and projecting the chip for chamfering to the outer peripheral side of the tool main body 10, the thip 20 for chamfering which becomes a polygonal shape (pentagonal shape or more) is used, the holding member 30 is provided with two abutting parts 31 and 31 extending in a spreading direction toward the outer peripheral side of the tool main body 10, only two oblique sides 21 and 21 extending in the spreading direction of the thip for chamfering are allowed to be abutted on the two abutting parts 31 and31 and the thip 20 for chamfering is mounted on the holding member 30 by a fastening member 50.
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