| 摘要 |
PROBLEM TO BE SOLVED: To provide a drilling tool which can form a prepared hole, a female screw part, and a chamfer part with a single unit to shorten the time of processing a screw hole.SOLUTION: A drilling tool 1 comprises a drilled tap 10 having the drilling part 12 for forming a prepared hole and a tap 15 for forming a female part, a chamfer chip 20, and an energization mechanism 25 that is arranged between the first holding member 16 that holds the drilled tap 10 and the second holding member 21 that holds the chamfer chip 20, presses the chamfer chip 20 to a processing object, and allows the chamfer chip 20 to move along a feed direction with respect to the drilling part 12 and the tap 15 in accordance with a cutting resistance acting on the chamfer chip 20. |
