Cutting insert, cutting tool, and method of producing machined product
First Claim
1. A cutting insert, comprising:
- an upper surface, a lower surface and a side surface located between the upper surface and the lower surface, and a polygonal plate shaped in which a cutting edge is formed at a ridgeline where the upper surface and the side surface intersect each other,wherein the upper surface comprises a convex shaped major part having a flat upper end surface, a first protrusion protruding from the major part toward a corner part of the upper surface, a second protrusion protruding from the first protrusion toward the corner part, and a pair of projections located between the second protrusion and the cutting edge so as to interpose between the projections a region lying between a front end of the second protrusion and the corner part,wherein a height of an upper end of the first protrusion is lower than a height of the upper end surface of the major part and is higher than a height of the cutting edge,wherein a height of an upper end of the second protrusion is equal to the height of the cutting edge, andwherein a height of an upper end of each of the pair of projections is lower than the height of the second protrusion.
1 Assignment
0 Petitions
Accused Products
Abstract
A cutting insert may have an upper surface, lower surface, side surface, and a polygonal plate shaped to form a cutting edge at a ridgeline where the upper surface and the side surface intersect. The upper surface has a major part having a flat upper end surface, a first protrusion protruding from the major part toward a corner part of the upper surface, a second protrusion protruding from the first protrusion toward the corner part, and a pair of projections located between the second protrusion and the cutting edge. A height of an upper end of the first protrusion from the lower surface is lower than a height of the upper end surface of the major part and is higher than a height of the cutting edge. A height of an upper end of the second protrusion from the lower surface is equal to the height of the cutting edge.
28 Citations
7 Claims
-
1. A cutting insert, comprising:
- an upper surface, a lower surface and a side surface located between the upper surface and the lower surface, and a polygonal plate shaped in which a cutting edge is formed at a ridgeline where the upper surface and the side surface intersect each other,
wherein the upper surface comprises a convex shaped major part having a flat upper end surface, a first protrusion protruding from the major part toward a corner part of the upper surface, a second protrusion protruding from the first protrusion toward the corner part, and a pair of projections located between the second protrusion and the cutting edge so as to interpose between the projections a region lying between a front end of the second protrusion and the corner part, wherein a height of an upper end of the first protrusion is lower than a height of the upper end surface of the major part and is higher than a height of the cutting edge, wherein a height of an upper end of the second protrusion is equal to the height of the cutting edge, and wherein a height of an upper end of each of the pair of projections is lower than the height of the second protrusion. - View Dependent Claims (2, 3, 4, 5, 6, 7)
- an upper surface, a lower surface and a side surface located between the upper surface and the lower surface, and a polygonal plate shaped in which a cutting edge is formed at a ridgeline where the upper surface and the side surface intersect each other,
Specification