| 摘要 |
<p>The present invention relates to a drill (10) for chip removing machining, including a shank (12) having a longitudinal direction (L) and a first tip forming end (14), with at least two cutting edges, and a second opposed end (18), two chip flutes (26,28) which extend from the first tip forming end (14) to the opposite end (18) of the shank (12) and two cooling channels (30,32) which extend through the shank (12) of the drill (10) and terminate in the first tip forming end (14). To provide space for chip flutes with enough large cross sectional area at helix drills one often uses two cooling channels, which extend helically between the helical chip flutes. The production of such in helically circumferential cooling channels is both complicated and expensive. The drill (10) according to the present invention is characterized by that the cooling channels (30,32), along a major part of the length (L) of the shank (12) have a linear extension and run parallel with a center axis (20) of the shank (12) and that the drill (10) is a helix drill. <IMAGE></p> |
