Patent ID: 7306409
Filing Date: 2007-12-11
Classification: B23C,Y10T

Abstract:
1. A cutting insert comprising a multi-cornered base body including top and bottom surfaces interconnected by a peripheral surface; the peripheral surface including lateral surfaces and corner surfaces interconnecting the lateral surfaces; at least one of the top and bottom surfaces constituting a cutting surface; a cutting edge disposed between the cutting surface and the peripheral surface, the cutting edge including lateral cutting edge portions and corner cutting edge portions; the lateral cutting edge portions being disposed along respective lateral surfaces, and the corner cutting edge portions being disposed along respective corner surfaces; the lateral cutting edge portions being interconnected by the corner cutting edge portions; the cutting surface further including a plateau surface and a rake surface, the plateau surface defining a seating surface; the rake surface surrounding the plateau surface and situated between the plateau surface and the cutting edge; the rake surface including lateral rake surface portions and corner rake surface portions; the lateral rake surface portions extending along respective lateral cutting edge portions, and the corner rake surface portions extending along respective corner cutting edge portions; a step disposed between the plateau surface and the rake surface and extending upwardly with respect to the plateau surface; the step including lateral step portions and corner step portions; the lateral step portions extending along respective lateral rake surface portions, and the corner step portions extending along respective corner rake surface portions; wherein the corner step portions extend uninterruptedly along the respective corner rake surface portions; the step being of varying height, wherein a maximum height is disposed at the corner step portions.