Patent ID: 9718138
Date: 2017-08-01
CPC Classifications: B23C,Y10T

Claim:
1. A cutting insert, comprising: an upper surface; a lower surface; a side surface connected to each of the upper surface and the lower surface; a cutting edge comprising sequentially a corner cutting edge, a first straight cutting edge, a second straight cutting edge, and a third straight cutting edge, which are located along an intersection of the upper surface and the side surface and intersect one another at an obtuse angle; and a through hole extending from a middle part of the upper surface to a middle part of the lower surface, wherein the upper surface comprises a first inclined surface that extends along the first straight cutting edge and has a smaller height from a virtual plane orthogonal to a central axis of the through hole as departing from the first straight cutting edge, a second inclined surface that extends along the second straight cutting edge and has a smaller height from the virtual plane as departing from the second straight cutting edge, and a third inclined surface that extends along the third straight cutting edge and has a smaller height from the virtual plane as departing from the third straight cutting edge, and wherein an inclination angle of the second inclined surface with respect to the virtual plane is larger than an inclination angle of each of the first inclined surface and the third inclined surface with respect to the virtual plane.