| 摘要 |
A rock drill has at least one hard material insert (2) with at least two cutting edges (3, 7) consisting of hard material and extending radially to the drill axis (A), whereby, in a radial range of 20% to 50% of their drilling radius, at least two cutting edges (3, 7) each have an axial recess (4), and the cutting edges (3, 7) rotating around the drill axis (A) extend with their cutting edges in their entirety without any gaps over the entire drilling radius.
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