Patent ID: 9272342
Filing Date: 2016-03-01
CPC Classification: B23C,Y10T

Claim Text:
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 and sequentially comprising a first side surface, a corner side surface, and a second side surface; and a cutting edge comprising a major cutting edge located at an intersecting part of the upper surface and the first side surface, a corner cutting edge located at an intersecting part of the upper surface and the corner side surface, and a minor cutting edge located at an intersecting part of the upper surface and the second side surface, wherein the upper surface sequentially comprises a first rake surface and a second rake surface, the first rake surface being located along the cutting edge and inclined toward the lower surface as going inward from the cutting edge at a first rake angle on a basis of a perpendicular plane perpendicular to a central axis extending between the upper surface and the lower surface, the second rake surface being located more inward than the first rake surface and inclined toward the lower surface at a second rake angle different from the first rake angle on the basis of the perpendicular plane, wherein an intersecting part between the first rake surface and the second rake surface comprises a protruded part located at a highest position in a region of the intersecting part extending along the second side surface, and wherein the first rake angle of the first rake surface is subject to less variation than the second rake angle of the second rake surface in a region extending from the first side surface to the corner side surface.