| 摘要 |
<p>In order to ensure good guidance of a drilling tool at the start of a drilling operation and at the same time ensure a reliable evacuation of a center chip, in the drill bit (2), in a tool flank (12) adjoining a respective main cutting edge (4), an additional point thinning (30) is recessed in the region of a transverse cutting edge (6), which additional point thinning, extending in a principal direction (32) from the tool flank (12), merges, with a convex course, into a chip flute (14). As a result of the convex design, an as far as possible homogeneous, edge-free transition into the chip flute is obtained. Since the point thinning (30) is additionally made, the tool flank, even in the rear end facing away from the cutting edge (4), remains at a front axial position, so that a second land (24) is effective for a reliable guidance of the bore already at an axially front position.</p> |
