Patent ID: 9616506
Date: 2017-04-11
CPC Classifications: B23C,Y10T

Claim:
1. A cutting insert for a milling cutter, the cutting insert comprising two polygonal main surfaces facing each other and a plurality of side surfaces each connected to a corresponding side of each of the main surfaces, the main surfaces being used as rake faces and ridges where the main surfaces and the side surfaces intersect being used as cutting edges, wherein the plurality of side surfaces include a major side surface through which an attachment hole extends, a first minor side surface perpendicular to the major side surface, and a second minor side surface disposed between the first minor side surface and the major side surface, wherein a ridge where each of the main surfaces and the major side surface intersect forms a major cutting edge, and a ridge where each of the main surfaces and the second minor side surface intersect forms a minor cutting edge, and wherein an angle between the major cutting edge and the minor cutting edge is 145° or larger, and wherein the major cutting edge has a convex arc shape in view from a direction perpendicular to the major side surface.