| 摘要 |
<p>The drilling bit has a cylindrical head (1) with two chip channels formed by a diametrical cutter (2) and an outer surface (5) formed by two curved segments with toothed front edges (4). The teeth (8) are formed by rectangular notches with side walls forming machining surfaces and cutting edges. The outer surfaces of the curved segments are smooth and their inner surface have grooves (12) between the teeth.</p> |
