| 摘要 |
PROBLEM TO BE SOLVED: To easily change its chamfering quantity with a simple constitution, in a drill for performing chamfering work for removing burrs of obverse-reverse surfaces of a workpiece simultaneously with boring work. SOLUTION: This drill can freely protrude and retreat chamfering blades 51 and 52 from an outer peripheral surface 12A of an edge part 12, by storing a cartridge 40 having the chamfering blades 51 and 52 in a recessed part 30 formed on the outer periphery of a tip side part of the edge part 12 so as to be elastically displaceable in the radial direction of a drill body 10. The cartridge 40 is composed of a cartridge body 41 having the chamfering blades 51 and 52, and a plate spring 45 detachably fixed to this cartridge body 41 and detachably fixed to the recessed part 30. COPYRIGHT: (C)2005,JPO&NCIPI
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