| 摘要 |
<p>The invention proposes a drill bit (1) leaving at least one main cutting edge (3, 3′) and at least one center cutting edge (15, 15′), wherein the drill bit (1) comprises a longitudinal axis (13), and wherein the at least one main cutting edge (3, 3′) and the at least one center cutting edge (15, 15′) are each assigned a rake face (7, 7′, 11, 11′). The drill bit (1) is characterized in that the rake face (11, 11′) assigned to the at least one center cutting edge (15, 15′) has at least two part faces (19, 19′; 21, 21′) which—as seen as perpendicular to the longitudinal axis (13) of the drill bit (1)—form an obtuse angle with one another, so that the at least one center cutting edge (15, 15′) comprises at least two part cutting edges (23, 23′; 25, 25′).</p> |
