| 摘要 |
The cutting bit has an upper surface (3) and a lower surface which are connected together by circumferential edge surfaces (4, 5a, 5b). Cutting edges (1) are formed between respective corners (6, 7) at the transition of the circumferential edge surfaces to the upper and/or lower surface. The cutting edges extend between adjacent corners with a relatively larger radius, where the cutting bit is of a symmetrical configuration only with respect to a rotation through 180 degrees but not with respect to a rotation through 90 degrees. |
