| 摘要 |
PROBLEM TO BE SOLVED: To provide a composite drill including a cutting blade member, whose rear end is inserted in a mounting hole of a shank and fixed and fitted by an adhesive, achieving stable high-accuracy boring by restraining displacement of the position of the cutting blade even if the adhesive is softened due to heat of cutting. SOLUTION: In this composite drill, the rear end 17 of the cutting blade member 16 having a cutting blade part 15 at the tip is inserted in the mounting hole 12 formed at the tip of the shank 11 and fixed and fitted by the adhesive 18. A flat surface part 22 vertical to the central axis opposite to the rear end face 21 of the cutting blade member 16 in the central axis (the axis O of the shank 11) direction of the mounting hole 13 and a recessed part 23 recessed from the flat surface part 22 to the rear end side of the shank 11 are formed at the hole bottom 14 of the mounting hole 13. COPYRIGHT: (C)2007,JPO&INPIT
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