| 摘要 |
<p>The present invention relates to a drill for chip removing machining, including a shank (10) with a first tip forming end (12), with at least one cutting edge, and a second opposed end (14), two chip flutes (22, 24) which extend from the first tip forming end (12) to the second opposite end (14) of the shank (10), and a cooling channel (26) located between the chip flutes (22, 24) which extends through the shank (10) of the drill from the second end (14) and in direction towards the tip forming the end (12), said cooling channel (26) located between the chip flutes (22, 24) dividing at a position between the first tip forming end (12) and the second end (14) into two branch channels (34, 36), which terminate in the first tip forming the end (12). With known drills of the above-captioned type the depth of the chip flute for the central insert is limited by the central cooling channel, the center axis of which coincides with the center axis of the shank. This results in that the circularly shaped chip from the central insert has a tendency to stick in the associated chip flute. The drill according to the present invention is characterized by that the cooling channel (26) located between the chip flutes (22,24) is eccentrically located relative to the center axis (16) of the shank (10) and that the center axis (16) of the shank (10) is situated in the cooling channel (26) located between the chip flutes (22,24). <IMAGE></p> |
