Patent ID: 7775750
Filing Date: 2010-08-17
Classification: B23C,Y10T

Abstract:
1. A two-way indexable tangential cutting insert comprising: an insert body having a central axis around which the cutting insert has 180° rotational symmetry, a top surface, a bottom surface, 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 extending along the central axis and connecting the top and bottom surfaces; first and second major cutting edges formed at the intersection of the major side surfaces, with the top surface having a convex contour which extends between the major cutting edges; first and second minor cutting edges each being formed along a juncture between one side of a major side surface and an adjacent minor side surface; wherein: the bottom surface comprises 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; the insert recess has a maximum width dimension that is larger than a minimum diameter of the insert through bore; the insert recess is shaped to receive and accommodate a pocket protrusion rising from a pocket base of an insert receiving pocket; and in a cross-sectional view containing the central axis, a shape of the through bore at the top surface differs from a shape of the through bore at the insert recess.