Patent ID: 11858050
Assignee: TUNGALOY CORPORATION
Field: Machine tools (Mechanical engineering)
Classification: CPC B | IPC B

Claim 0:
1. A cutting insert comprising:
an upper surface serving as a first end surface;
a lower surface serving as a second end surface opposite to the upper surface and having a mounting surface to be brought into contact with a body of a cutting tool;
a peripheral side surface formed to connect the upper surface and the lower surface;
a cutting edge including a main cutting edge and a corner cutting edge, the main cutting edge and the corner cutting edge being formed at an intersecting edge between the upper surface and the peripheral side surface;
a projecting portion including a first projection formed to have an elongated shape elongated in a direction extending from a corner portion toward a central axis, the central axis extending through a center of the upper surface in a direction perpendicular to the lower surface, and having a top surface including a portion having a height decreasing with distance from the corner portion toward the central axis and a second projection extending from the first projection and having a top surface having a height increasing with distance from the first projection toward the central axis; and
a rake portion formed between the projecting portion and the cutting edge, wherein
the cutting edge has an inclined portion provided to extend from an intermediate point in the corner cutting edge such that a height of the cutting edge from the lower surface decreases with distance from the corner cutting edge,
the inclined portion includes a first inclined portion beginning at the intermediate point in the corner cutting edge, and
a rake angle of the rake portion increases with distance from the corner portion.