| 摘要 |
<p>An indexable tangential cutting insert that has an insert body (102) having a central axis around which the cutting insert has 180 degrees rotational symmetry, a top surface (110), a bottom surface, a peripheral side surface extending between the top and bottom surfaces, the peripheral side surface including a pair of opposing major side surfaces connecting to a pair of minor side surfaces, and an insert through bore (180) extending along the central axis and connecting the top (110) and bottom surfaces. First and second major cutting edges (122A and 122B) are formed at the intersection of the major side surfaces, with the top surface having a convex contour which extends between the major cutting edges (122A and 122B) and first (174A) and second minor cutting edges are each formed along a juncture between one side of a major side surface (116A) and an adjacent minor side surface (114A). The bottom surface has a base surface and an insert protrusion abutment surface formed on an insert protrusion which rises above the base surface, in a bottom view of the cutting insert. The insert protrusion is formed in a central portion of the bottom surface and is at least partially surrounded by the base surface. An insert recess is formed in the insert protrusion along the central axis and communicates with the insert through bore (180), the insert recess having a maximum width dimension that is larger than a minimum diameter of the insert through bore (180).</p> |
