| 摘要 |
PROBLEM TO BE SOLVED: To provide a throw-away blade of a graver which has flexible combination thereof.SOLUTION: A throw-away blade of a graver includes a main body 10, a right cut edge 12, a left cut edge 13, and a tip cut part 14. The main body 10 has a center seat hole 11 formed at a center thereof. The right cut edge 12 and the left cut edge 13 are positioned on both sides of a straight center line 15 passing a center of the center seat hole 11 of the main body, and form a V-shape. The tip cut part 14 is formed at an end part of the main body in which a distance between the right cut edge 12 and the left cut edge 13 is the narrowest. A virtual apex as a virtual point, at which a virtual extension line of the right cut edge 12 and a virtual extension line of the left cut edge 13 cross each other, is deviated on one side of the center lin 15 by a predetermined distance. |
