| 摘要 |
PCT No. PCT/SE93/01034 Sec. 371 Date Jul. 5, 1995 Sec. 102(e) Date Jul. 5, 1995 PCT Filed Dec. 1, 1993 PCT Pub. No. WO94/13422 PCT Pub. Date Jun. 23, 1994A spiral drill and a method to manufacture a spiral drill with two indexable inserts at different distances from the center line and two coolant channels, where the coolant channels (23,24) run parallel to the center line within the shank part, and where the spiral part has been twisted while heated to form spirally curved coolant channels (17,18), and where exit channels at the tip have been drilled after twisting, and where the exit openings (21,2) are located at different distances from the center line. |
