| 摘要 |
The rock drill has at least one insert (2) of a hard material, with at least two cutters (3) of hard material extending radially to the drill axis (A). At least two cutters each have an axial recess (4) in a radial range of 20-50% of the drill radius. The cutters, rotating around the drill axis, have cutting edges which wholly cover the total drill radius without gaps. |
