Cutting inserts with control cavities

Patent metadata

Field	Value
Publication number	US-11413689-B2
Application number	US-202016885504-A
Country	US
Kind code	B2
Filing date	May 28, 2020
Priority date	May 28, 2020
Publication date	Aug 16, 2022
Grant date	Aug 16, 2022

Abstract

Cutting tool systems including a cutting tool and cutting inserts are disclosed. The cutting inserts have indexable cutting edges and seating face features which enable uniform facets along a portion of each cutting edge of the indexable insert. The first and second seating face surfaces of the cutting insert each comprise control cavities that adjoin the cutting edge facet surfaces. Each control cavity allows its corresponding cutting edge to have a facet width that is defined by the cavity to provide uniform surfaces. The control cavities reduce and limit the amount of the first and second seating face surfaces that need to be ground. Methods of making such cutting inserts are disclosed.

First claim

What is claimed is:

1. A cutting insert, comprising:
a first face;
a second face opposite the first face;
a plurality of side surfaces adjoining the first face and the second face;
a plurality of cutting edges formed at intersections between the plurality of side surfaces and the first face;
a plurality of margin facet surfaces formed on the first face, wherein each of the plurality of margin facet surfaces is formed adjacent to each of the plurality of the cutting edges; and
a plurality of cavities recessed in the first face, wherein each of the plurality of cavities is adjoining each of the margin facet surfaces, and
wherein the intersections between the plurality of side surfaces and the first face further comprise a plurality of corner wiper facet surfaces, wherein each of the plurality of corner wiper facet surfaces extends from the margin facet surface to a corner portion.

2. The cutting insert of claim 1 , wherein each of the plurality of cavities comprise a bottom surface recessed from the adjoining margin facet surface.

3. The cutting insert of claim 1 , wherein each of the plurality of cavities comprise:
a bottom surface; and
a first sidewall portion extending from the bottom surface adjacent to the margin facet surface.

4. The cutting insert of claim 3 , wherein each of the plurality of cavities comprise a first transitional fillet provided between the bottom surface and the first sidewall portion.

5. The cutting insert of claim 1 , further comprising a mounting hole comprising a central axis extending from the first face to the second face, and wherein the first face is rotationally symmetrical with respect to the central axis of the mounting hole.

6. The cutting insert of claim 1 , wherein each of the plurality of cutting edges is formed along a partial length of the intersection between the plurality of side surfaces and the first face.

7. The cutting insert of claim 1 , wherein each of the plurality of margin facet surfaces comprise a first side edge forming the cutting edge and a second side edge adjoining the cavity.

8. The cutting insert of claim 1 , wherein a length of each of the plurality of corner wiper facet surfaces is less than a length of each of the plurality of margin facet surfaces.

9. The cutting insert of claim 1 , further comprising a plurality of contact surfaces on the first face extending from each of the plurality of corner wiper facet surfaces.

10. The cutting insert of claim 1 , wherein each of the plurality of cavities extend from a first contact surface to an adjacent second contact surface on the first face.

11. The cutting insert of claim 1 , wherein each of the plurality of cavities extend from the margin facet surface to a mouth portion of a mounting hole extending from the first face to the second face.

12. The cutting insert of claim 1 , wherein the cutting insert is a tangential cutting insert.

13. The cutting insert of claim 1 , wherein the second face comprises:
a plurality of cutting edges formed at intersections between the plurality of side surfaces and the second face;
a plurality of margin facet surfaces formed on the second face, wherein each of the plurality of margin facet surfaces is formed adjacent to each of the plurality of the cutting edges; and
a plurality of cavities recessed in the second face, wherein each of the plurality of cavities is adjoining each of the plurality of margin facet surfaces, and
wherein the intersections between the plurality of side surfaces and the second face further comprise a plurality of corner wiper facet surfaces, wherein each of the plurality of corner wiper facet surfaces extend from the margin facet surface to a corner portion.

14. The cutting insert of claim 13 , wherein the first face is twisted relative to the second face about a central axis of the cutting insert.

15. The cutting insert of claim 13 , further comprising a mounting hole comprising a central axis extending from the first face to the second face, and wherein the first face and the second face are rotationally symmetrical with respect to the central axis of the mounting hole.

16. The cutting insert of claim 13 , wherein a transitional fillet is provided between each of the plurality of margin facet surfaces and each of the plurality of corner wiper facet surfaces.

17. A cutting tool comprising a tool body comprising the cutting insert as recited in claim 1 mounted in an insert pocket of the tool body.

18. A method of making a cutting insert of claim 1 comprising:
pressing and sintering metal carbide powder to form an insert blank comprising a first face comprising a plurality of cavities recessed in the first face, a second face opposite the first face, and a plurality of side surfaces adjoining the first face and the second face; and
surface grinding a plurality of margin facet surfaces located on the first face between each of the cavities and one of the plurality of side surfaces to form a cutting edge at an intersection of each of the plurality of margin facet surfaces and an adjacent one of the plurality of side surfaces.

Assignees

• Kennametal Inc

Inventors

• Schleicher Sebastian
• Spitzenberger Konrad

Classifications

• B23C5/202

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

• B23C2200/367

  Mounted tangentially, i.e. where the rake face is not the face with largest area · CPC title

• B23C2200/208

  Wiper, i.e. an auxiliary cutting edge to improve surface finish · CPC title

• B23C2200/085

  discontinuous · CPC title

• B23B2200/3681

  Split inserts, i.e. comprising two or more sections roughly equal in size and having similar or dissimilar cutting geometries · CPC title