| 摘要 |
An insert drill with a chamfering function in which a chamfering insert (20) is inserted into and projected from a mounting hole (11) of a drill body (10) by a tension of a torsion spring (30). The insert drill includes the drill body (10) having the mounting hole (11) and first and second bolt holes (13) and (15), the chamfering insert (20) inserted into the mounting hole (11), and having a coupling groove (21), a first bolt (40) tightened into the first bolt hole (13), a second bolt (60) tightened into the second bolt hole (15), a push rod (50) coupled to an inside end of the second bolt (60), with a coupling hole (51) formed on the push rod (50), and the torsion spring (30) provided in the inner space of the drill body (10). The torsion spring (30) has a first spring arm (31) coupled to the chamfering insert (20), a coiled part (32) engaging with an outer surface of the first bolt (40), and a second spring arm (33) coupled to the push rod (50). |
