| 摘要 |
PROBLEM TO BE SOLVED: To provide a cutting tool capable of inhibiting the occurence of chips and peeling in a hole.SOLUTION: An intermediate part 200 of a drill 1 comprises: a fifth edge line 50; and a sixth edge line 60. A first edge line 10 continues into the fifth edge line 50. A third edge line 30 continues into the sixth edge line 60. A second edge line 20 ends at a border between a tip part 100 and the intermediate part 200. The fifth edge line 50 and the sixth edge line 60 are curved shape and the edge lines ranging from the first edge line 10 to the sixth edge line 60 are formed by a superhard tool material. |
