A CUTTING INSERT WITH A ROUNDED CORNER

摘要

A cutting insert (1) for use in a milling cutter for a face milling has uppe r, lower and side surfaces and at least one pair of main and minor cutting edge s (10, 11) formed by the intersection between the upper surface (5) and an adjacent side surface (7). The cutting edges (10, 11) merge via a cutting corner portion (12) of a relatively large radius, which is provided with a land (15) formed at the upper surface (5) of the insert. The land (15) is inclined to the insert lower surface at an inclination angle which continuously varies from a negative value at an area of the corner portion (12) adjacent the main cutting edge (10) to a positive value at an area of t he corner portion (12) adjacent the minor cutting edge (11).