| 摘要 |
The invention concerns a drilling tool for machine tools, said drilling tool comprising a drill shank (14) provided with a radially outwardly projecting feed helix (12). The drilling tool also comprises a drilling head (16) which is disposed at the end of the drill shank (14) and has two segment sections (20) which are delimited radially outwardly by partially cylindrical peripheral surfaces (22) and separated from each other by axially parallel chip grooves (18) which are adjacent in the peripheral direction. The drilling head further comprises at least two cutting plates (26) which are disposed at different radial spacings from the drilling tool axis and each have a cutting edge projecting at the end face beyond the drilling head (16). The chip grooves are delimited on the side of the cutting plates by an axially parallel radial chip-deflection surface (24) and by a chip-guide surface (42) which is disposed on the adjacent segment section (20) and lies opposite the chip-deflection surface and substantially parallel thereto. The chip-deflection surfaces (24) terminate at an axial spacing from the cutting edges (30) at a substantially radial rear free edge (46) and merge there into a chip-feed surface (50) which delimits the relevant segment section at the rear in the direction of the drill shank, rising helically to the following chip channel (18). The annular space between the chip-feed surface and the end (58) of the feed helix (12) at the drilling head end forms a chip-stowing space (48) from which the chips produced during drilling are carried away externally in portions by the feed helix (12). |
