| 摘要 |
Cutting insert and tool, where the tool has a seat with at least 190 degrees of a cylindrical seat surface (24), and the insert has one convex region with a cutting edge (14) and three convex regions located so that they can simultaneously touch the cylindrical seat surface at three distinct points (17,19,21), and these points form a triangle with all angles acute. The insert can only be removed from the seat after rotation a finite angle away from its cutting position.
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