| 主权项 |
1. An insert, comprising: three or more corners along a perimeter; a main cutting edge formed on an edge between an upper surface and a main side surface, and a sub cutting edge formed on an edge between the upper surface and a sub side surface, wherein the main cutting edge and the sub cutting edge are placed in succession between the corners; and a flat lower surface, wherein
the main cutting edge forms an inclination angle such that a height decreases gradually in a direction toward the sub cutting edge, the main side surface is formed by a first end main side surface in contact with the main cutting edge, and a second end main side surface in contact with the lower surface, wherein the first end main side surface and the second end main side surface are formed in succession with different clearance angles from each other, and the sub side surface is formed by a first end sub side surface in contact with the sub cutting edge, and a second end sub side surface in contact with the lower surface, wherein the first end sub side surface and he second end sub side surface are formed in succession with different clearance angles with each other. |
