| 摘要 |
The invention concerns a drilling tool for machine tools. The drilling tool comprises a drill body (14) with two chip-conveying grooves which are delimited at their flanks by helically curved ribs (28). Disposed at the end of the drill body (14) is a drill head (22) which comprises two segment parts (62), which are separated from each other by opposite axially aligned chip spaces (60', 60''), and two cutting plates (18, 20) which are each disposed in a recess in the segment parts in the region of an axially parallel radial chipguide surface (66', 66'') at different radial spacings from the drill axis (34) with mutually partially overlapping working regions. At a transition point, the chip-guide surfaces (66', 66'') merge into the flanks (84) of the adjacent chip-conveying grooves (26). Disposed at at least one of the transition points is a transition surface (80) which is gradually recessed so that it widens the cross-section of the chip space (66', 66'') and merges into a flank of the adjacent chip-conveying groove (26). |
