| 摘要 |
The shank (2) of the rock drill (1) carries a cutting tip (3). In the centre, the end face of the cutting tip (3) has a central cutting nose (5) with two cutting edges (6) converging in the drilling direction. Outer cutting noses (7) adjoin the cutting edges (6) on both sides. The cutting edges (8) of the outer cutting noses (7) are inclined at an included angle ( alpha ) of 45 DEG to 90 DEG to the outer edges (9), running parallel to the drill axis, of the cutting tip (3). <IMAGE>
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