| 摘要 |
The invention relates to a conical countersink (1) with a main part (8) which has a central axis (17) and three geometrically defined cutting edges (3, 5, 7), each of which is paired with a chip space (9, 11, 13). The conical countersink (1) is characterized in that the angle (α) between a first cutting edge (3) and a second cutting edge (5) is 90° to 110°, the angle (β) between the second cutting edge (5) and a third cutting edge (7) is 100° to 140°, and the angle (γ) between the third cutting edge (7) and the first cutting edge (3) is 120° to 160°, wherein α < β < γ and α + β + γ = 360°. |
