Cutting insert and indexable cutting tool

Patent metadata

Field	Value
Publication number	US-9776259-B2
Application number	US-201414777309-A
Country	US
Kind code	B2
Filing date	Mar 18, 2014
Priority date	Mar 19, 2013
Publication date	Oct 3, 2017
Grant date	Oct 3, 2017

Abstract

A cutting insert includes: two opposite end surfaces; a peripheral side surface extending between the end surfaces; and plural cutting edge sections that are formed along an intersecting ridgeline portion between the peripheral side surface and each of the end surfaces. Each of the cutting edge sections includes a corner cutting edge, a major cutting edge, and a minor cutting edge. A non-cutting intersecting ridgeline area extending between adjacent cutting edge sections on one end surface is located adjacent, via the peripheral side surface, to at least a part of the corner cutting edge and the major cutting edge of an associating cutting edge section on the other end surface.

First claim

The invention claimed is:

1. A cutting insert comprising:
two opposite end surfaces including a first end surface and a second end surface, each of them having an outline with a substantially polygonal shape;
a peripheral side surface that extends between the first end surface and the second end surface; and
a plurality of cutting edge sections that are formed along an intersecting ridgeline portion between the peripheral side surface and each of the first end surface and the second end surface, each of the cutting edge sections comprising:
a corner cutting edge disposed at a corner portion;
a major cutting edge connected with one end of the corner cutting edge; and
a minor cutting edge connected with the other end of the corner cutting edge, wherein

at least two cutting edge sections and a seating surface are formed on each of the first end surface and the second end surface,
each of the cutting edge sections has a rake face on an adjacent end surface,
at least a part of each of the cutting edge sections at least protrudes in an insert thickness direction,
a non-cutting intersecting ridgeline area extending between adjacent cutting edge sections on either one of the first end surface and the second end surface is located adjacent, via the peripheral side surface, to at least a part of a portion including the corner cutting edge and the major cutting edge of an associating cutting edge section on the other one of the first end surface and the second end surface,
the seating surface on each of the first end surface and the second end surface extends between adjacent cutting edge sections, to an intersecting ridgeline portion between the seating surface and the peripheral side surface in the non-cutting intersecting ridgeline areas.

2. The cutting insert according to claim 1 , wherein
the plurality of cutting edge sections are arranged and formed so as to be rotationally symmetrical with respect to a first axis that is set to extend in the insert thickness direction so as to penetrate the first end surface and the second end surface, and also are arranged and formed so as to be rotationally symmetrical with respect to a second axis that is set so as to intersect with the first axis at a right angle and pass through the peripheral side surface.

3. The cutting insert according to claim 1 , wherein
the non-cutting intersecting ridgeline area on either one of the first end surface and the second end surface is located adjacent, in the insert thickness direction, to a portion extending from a part of the major cutting edge through the corner cutting edge to a part of the minor cutting edge, of the cutting edge section on the other one of the first end surface and the second end surface.

4. The cutting insert according to claim 1 , wherein
the non-cutting intersecting ridgeline area on either one of the first end surface and the second end surface is located adjacent, in the insert thickness direction, to the corner cutting edge and a part of the major cutting edge of the cutting edge section on the other one of the first end surface and the second end surface.

5. The cutting insert according to claim 1 , wherein
the non-cutting intersecting ridgeline area on either one of the first end surface and the second end surface is located adjacent, in the insert thickness direction, only to the corner cutting edge of the cutting edge section on the other one of the first end surface and the second end surface.

6. The cutting insert according to claim 1 , wherein
each cutting edge section further comprises a second corner cutting edge different from the corner cutting edge and connected with the minor cutting edge, and
the non-cutting intersecting ridgeline area on either one of the first end surface and the second end surface is located adjacent, in the insert thickness direction, only to a part of the major cutting edge of the cutting edge section on the other one of the first end surface and the second end surface.

7. An indexable cutting tool that comprises a tool body having at least one insert seat formed thereto, and a cutting insert in accordance with claim 1 detachably mounted on the insert seat, wherein:
the insert seat includes a bottom wall surface that is brought into abutment with the seating surface of the cutting insert, and
when the cutting insert is mounted on the insert seat in a way such that one cutting edge section on either one of the first end surface and the second end surface is used, the non-cutting intersecting ridgeline area adjacent to this cutting edge section and on the other one of the first end surface and the second end surface of the cutting insert is supported by the insert seat.

8. The indexable cutting tool according to claim 7 , wherein
the bottom wall surface of the insert seat comprises a portion that is capable of being brought into abutment with the non-cutting intersecting ridgeline area of the cutting insert.

9. An indexable cutting insert comprising:
two opposite end surfaces including a first end surface and a second end surface, each end surface having an outline with four corners and a rectangular shape;
a peripheral side surface that extends between the first end surface and the second end surface, the peripheral side surface comprising a pair of major first side surface portions connected to a pair of minor second side surface portions via four corner surface portions;
a mounting hole passing between the first and second end surfaces;
a plurality of cutting edge sections that are formed along an intersecting ridgeline portion between the peripheral side surface and each of the first end surface and the second end surface, each of the cutting edge sections comprising:
a first corner cutting edge disposed at a corner portion;
a major cutting edge connected with one end of the first corner cutting edge; and
a minor cutting edge connected with the other end of the first corner cutting edge, wherein

at least two cutting edge sections and a seating surface are formed on each of the first end surface and the second end surface,
each seating surface is closer to a median plane located midway between the first and second end surfaces than the cutting edge sections,
each of the cutting edge sections has a rake face on an adjacent end surface,
a non-cutting intersecting ridgeline area extending between adjacent cutting edge sections on either one of the first end surface and the second end surface is located adjacent, via the peripheral side surface, to at least a part of a portion including the corner cutting edge and the major cutting edge of an associating cutting edge section on the other one of the first end surface and the second end surface;
each minor cutting edge extends continuously from the first corner cutting edge to an adjacent second corner cutting edge different from the first corner cutting edge;
each non-cutting intersecting ridgeline area is spaced apart from all four corners of its associated end surface and from said adjacent second corner cutting edge,
each non-cutting intersecting ridgeline area extends along a first major side surface portion for less than one-half a length thereof, and
each non-cutting intersecting ridgeline area is coplanar with the seating surface of its associated end surface.

10. A cutting insert comprising:
two opposite end surfaces including a first end surface and a second end surface, each of them having an outline with a substantially polygonal shape;
a peripheral side surface that extends between the first end surface and the second end surface; and
a plurality of cutting edge sections that are formed along an intersecting ridgeline portion between the peripheral side surface and each of th

Assignees

• Tungaloy Corp

Inventors

• Saji Ryuichi

Classifications

• B23C5/2213

  having a special shape · CPC title

• B23C5/109

  with removable cutting inserts · CPC title

• B23C5/202 Primary

  Plate-like cutting inserts with special form (special form related to securing of the insert B23C5/22) · CPC title

• B23C2210/168

  Seats for cutting inserts, supports for replacable cutting bits · CPC title

• B23C2210/0457

  radial rake angle · CPC title