Cutting tool made by additive manufacturing

Patent metadata

Field	Value
Publication number	US-9975182-B2
Application number	US-201514710644-A
Country	US
Kind code	B2
Filing date	May 13, 2015
Priority date	May 13, 2015
Publication date	May 22, 2018
Grant date	May 22, 2018

Abstract

A cutting tool made by an additive manufacturing process is disclosed. The cutting tool has an exterior surface and an enclosed interior cavity defined by one or more inwardly facing surfaces. The interior cavity may have internal supports such as a lattice or a honeycomb structure. The cutting tool may be an insert, drill or endmill with coolant holes.

First claim

That which is claimed is:

1. A cutting tool comprising:
an exterior surface and

an enclosed interior cavity defined by inwardly facing surfaces, the enclosed interior cavity comprising one or more lattice structures within and supporting the interior cavity, wherein the lattice structures comprise intersecting rod structures extending between two or more of the inwardly facing surfaces.

2. The cutting tool of claim 1 , wherein the cutting tool comprises cemented tungsten carbide.

3. The cutting tool of claim 1 , further comprising:
a rake face;
a flank face;
a cutting edge at the intersection of the rake face and flank face.

4. The cutting tool of claim 3 , the rake face, a flank face or another surface containing a coolant inlet and wherein the rake face includes an array of coolant discharge holes adjacent to and along the cutting edge.

5. The cutting tool of claim 4 , wherein the array is a two-dimensional array.

6. The cutting tool of claim 1 , further comprising a PVD or CVD coating on at least the rake or flank face.

7. The cutting tool of claim 1 , wherein the cutting tool is a cutting insert.

8. A cutting tool comprising:
an exterior surface and

an enclosed interior cavity defined by inwardly facing surfaces, the enclosed interior cavity comprising a lattice of intersecting rod structures within and supporting the interior cavity, wherein the cutting tool is selected from the group consisting of a drill, reamer and endmill.

9. The cutting tool of claim 8 , wherein the cutting tool is a drill or endmill and the cavity is in a cutting region of the drill or endmill.

10. The cutting tool of claim 8 , wherein the lattice of intersecting rod structures extend between two or more of the inwardly facing surfaces.

11. The cutting tool of claim 8 , wherein the cutting tool is formed of sintered cemented carbide.

12. The cutting tool of claim 11 having a final density greater than 95%.

13. The cutting tool of claim 11 , wherein the sintered cemented carbide comprises metallic binder in an amount of 10 to 30 weight percent.

14. The cutting tool of claim 13 , wherein the metallic binder comprises an alloying element selected from the group consisting of ruthenium, rhenium and molybdenum.

15. The cutting tool of claim 14 , wherein the alloying additive is present in an amount of 10 to 30 percent of the metallic binder phase.

16. The cutting tool of claim 15 , wherein the alloying additive exhibits hexagonal crystal phase.

17. The cutting tool of claim 8 further comprising a coating of one or more refractory materials, the coating be deposited by PVD, CVD or combinations thereof.

18. The cutting tool of claim 8 , wherein the lattice of intersecting rod structures consist of cemented carbide.

19. The cutting tool of claim 18 , wherein a hard particle phase of the cemented carbide has an average grain size less than 10 μm.

20. The cutting tool of claim 18 , wherein a hard particle phase of the cemented carbide has an average grain size of 0.5-3 μm.

Assignees

• Stoyanov Pantcho
• Kennametal Inc

Inventors

• Stoyanov Pantcho

Classifications

• B22F10/66

  by mechanical means · CPC title

• B22F10/64

  by thermal means (control of energy beam parameters for post heating B22F10/364) · CPC title

• B22F10/14

  by jetting of binder onto a bed of metal powder · CPC title

• C22C1/051

  Making hard metals based on borides, carbides, nitrides, oxides or silicides; Preparation of the powder mixture used as the starting material therefor · CPC title

• B23B27/14 Primary

  Cutting tools of which the bits or tips {or cutting inserts} are of special material · CPC title