Patent ID: 11911827
Assignee: TUNGALOY CORPORATION
Field: Machine tools (Mechanical engineering)
Classification: CPC B | IPC B

Claim 0:
1. A cutting insert comprising:
a rake surface;
a peripheral side surface;
a front cutting edge which is provided on a ridge of the rake surface and the peripheral side surface; and
a main cutting edge which is provided on the ridge so as to be continuous with the front cutting edge, and has an extension direction which forms an obtuse angle with an extension direction of the front cutting edge, wherein
the main cutting edge has an effective edge range for cutting, and is curved into a U shape over an entire length of the effective edge range of the main cutting edge, and a deepest point of the U shape is positioned in a range closer to a side of a corner than a position which divides a straight line connecting both ends of the main cutting edge at a ratio of 2:1 from the side of the corner positioned adjacent to the front cutting edge, and
the front cutting edge has an effective edge range for cutting, and is curved into a U shape over an entire length of the effective edge range of the front cutting edge.