| 摘要 |
<p>PCT No. PCT/EP93/03118 Sec. 371 Date Aug. 11, 1995 Sec. 102(e) Date Aug. 11, 1995 PCT Filed Nov. 8, 1993 PCT Pub. No. WO94/12305 PCT Pub. Date Jun. 9, 1994A drill includes a substantially cylindrical holder (10) with a longitudinal axis (X) and a transverse axis (Y) perpendicular thereto, a drill tip (12) in which there is a groove (14) running along the transverse axis (Y) with a groove bottom (16) and groove sides (18',18''), and a cutting insert fitted in the groove having two main cuts (26',26'') with forwardly adjacent cutting surfaces (32',32'') and two rear surfaces (30',30'') opposite a cutting surface on the other side of the transverse axis (Y). The holder has two bores (20',20'') in a radial plane (R) of the drill, each of which is in the region of a rear surface (30',30'') of the insert (25) and opens into a groove side (18',18''). The longitudinal axes (24',24'') of the drillings (20',20'') run at an acute angle to the groove side (18',18'') and the adjacent rear surface (30',30'') of the insert (25). Stops (50',50'') projecting from a groove side surface (18',18'') are arranged in the bores (20',20''), and at least one of the two stops (50'') can move towards the longitudinal axis (24'') of the bore (20''). Recesses (34',34'') forming supporting surfaces (38',38'') corresponding to the stops (50',50'') are formed in the rear side surfaces (30',30'') of the insert (25).</p> |
