| 摘要 |
PCT No. PCT/DE97/00147 Sec. 371 Date Jul. 23, 1998 Sec. 102(e) Date Jul. 23, 1998 PCT Filed Jan. 21, 1997 PCT Pub. No. WO97/27967 PCT Pub. Date Aug. 7, 1997A cutting insert is formed with a substantially hexagonal cutting face having six sides forming three main cutting edges and three auxiliary cutting edges alternating with the main edges. Each of the main cutting edges is substantially straight and each of the auxiliary cutting edges is outwardly convex. A plateau is on the face inward of the cutting edges and defines a plane. Respective free surfaces each extend generally perpendicular to the plane from the cutting edges and meet at corners between the edges. The main cutting edges are usable for roughing and the auxiliary cutting edges for finishing. The insert is formed on the face along an entire length of and parallel to each of the cutting edge with a respective groove.
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