Cutting Insert
First Claim
1. A cutting insert, wherein:
- a cutting edge having a corner portion is formed on a peripheral border of a rake face of an insert body;
a protruding section is formed inside the corner portion so as to protrude from the rake face at a distance away from the cutting edge;
convex sections are respectively formed on both sides of the corner portion divided by a bisector and each of convex sections extends from a wall surface of the protruding section to the rake face;
each of the convex sections includes a first wall surface, a second wall surface intersecting with the first wall surfaces, and an intersection ridgeline between the first and second wall surfaces, said first and second wall surfaces facing the cutting edge;
the intersection ridgelines are of the convex sections gradually separated from each other toward the corner portion;
each of the first wall surfaces is positioned closer to the corner portion than the second wall surface, and is inclined surface that is inclined from the intersection ridgeline toward the rake face which adjoins the corner portion;
each of the second wall surfaces is also an inclined surface that is inclined from the intersection ridgeline toward the rake face which adjoins the peripheral border of the insert body beside the corner portion;
the intersection ridgelines intersect with the wall surface of the protruding section, at a position lower than a top portion of the protruding section in the corner portion side; and
a tilt angle of the second wall surfaces in a cross section orthogonal to the peripheral borders of the insert body beside the corner portion is smaller than a tilt angle of the first wall surfaces in the cross section orthogonal to the intersection ridgelines.
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Accused Products
Abstract
In a cutting insert, a cutting edge is formed on a peripheral border of a rake face; a protruding section is formed on the rake face; a pair of convex sections is formed so as to extend toward the cutting edge; the convex sections face toward a corner portion; the convex sections include first wall surfaces and second wall surfaces; the first wall surfaces and the second wall surfaces are inclined surfaces that are inclined toward the rake face as those are farther from ridgelines intersecting with each other; and the intersection ridgelines intersect with a wall surface of the protruding section, at a position lower than a top portion of the protruding section in the corner portion side.
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Citations
7 Claims
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1. A cutting insert, wherein:
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a cutting edge having a corner portion is formed on a peripheral border of a rake face of an insert body; a protruding section is formed inside the corner portion so as to protrude from the rake face at a distance away from the cutting edge; convex sections are respectively formed on both sides of the corner portion divided by a bisector and each of convex sections extends from a wall surface of the protruding section to the rake face; each of the convex sections includes a first wall surface, a second wall surface intersecting with the first wall surfaces, and an intersection ridgeline between the first and second wall surfaces, said first and second wall surfaces facing the cutting edge; the intersection ridgelines are of the convex sections gradually separated from each other toward the corner portion; each of the first wall surfaces is positioned closer to the corner portion than the second wall surface, and is inclined surface that is inclined from the intersection ridgeline toward the rake face which adjoins the corner portion; each of the second wall surfaces is also an inclined surface that is inclined from the intersection ridgeline toward the rake face which adjoins the peripheral border of the insert body beside the corner portion; the intersection ridgelines intersect with the wall surface of the protruding section, at a position lower than a top portion of the protruding section in the corner portion side; and a tilt angle of the second wall surfaces in a cross section orthogonal to the peripheral borders of the insert body beside the corner portion is smaller than a tilt angle of the first wall surfaces in the cross section orthogonal to the intersection ridgelines. - View Dependent Claims (3, 4, 5, 6, 7)
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2. (canceled)
Specification