# US 2016/0279747 A1 · Manufacturing of holemaking tools

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- Number: US 2016/0279747 A1
- Document ID: US20160279747A1
- Status: Published application
- Kind: A1
- Application number: 15/148,623
- Filed: 2016-05-06
- Published: 2016-09-29
- Earliest claimed: 2011-11-15
- Assignees: Kennametal Inc.
- Applicants: Kennametal Inc.
- Inventors: Herbert Rudolf KAUPER
- Web page: https://patentgrep.com/patent/US20160279747A1

## CPC

- B23P 15/32: twist-drills
- B23B 51/08: Drills combined with tool parts or tools for performing additional working {(B23G5/20 takes precedence)}
- B23D 77/00: Reaming tools
- C23C 14/22: characterised by the process of coating
- C23C 30/005: {on hard metal substrates}
- B23B 2228/08: applied by physical vapour deposition [PVD]
- B23B 2228/10: Coatings
- B23B 2228/105: with specified thickness
- Y10T 408/78: Tool of specific diverse material
- Y10T 408/905: Having stepped cutting edges
- Y10T 408/9065: with central lead
- B23P: METAL-WORKING NOT OTHERWISE PROVIDED FOR; COMBINED OPERATIONS; UNIVERSAL MACHINE TOOLS (arrangements for copying or controlling B23Q)
- B23B: TURNING; BORING (arrangements for copying or controlling B23Q)
- B23D: PLANING; SLOTTING; SHEARING; BROACHING; SAWING; FILING; SCRAPING; LIKE OPERATIONS FOR WORKING METAL BY REMOVING MATERIAL, NOT OTHERWISE PROVIDED FOR (making toothed gears or the like B23F; cutting metal by applying heat locally B23K; arrangements for copying or controlling B23Q)
- C23C: COATING METALLIC MATERIAL; COATING MATERIAL WITH METALLIC MATERIAL; SURFACE TREATMENT OF METALLIC MATERIAL BY DIFFUSION INTO THE SURFACE, BY CHEMICAL CONVERSION OR SUBSTITUTION; COATING BY VACUUM EVAPORATION, BY SPUTTERING, BY ION IMPLANTATION OR BY CHEMICAL VAPOUR DEPOSITION, IN GENERAL (making metal-coated products by extrusion B21C23/22; covering with metal by connecting pre-existing layers to articles, see the relevant places, e.g. B21D39/00, B23K; metallising of glass C03C; metallising mortars, concrete, artificial stone, ceramics or natural stone C04B41/00; enamelling of, or applying a vitreous layer to, metals C23D; treating metal surfaces or coating of metals by electrolysis or electrophoresis C25D; single-crystal film growth C30B; by metallising textiles D06M11/83; decorating textiles by locally metallising D06Q1/04)
- Y10T: TECHNICAL SUBJECTS COVERED BY FORMER US CLASSIFICATION

## Abstract

A process for producing a tool having a main body which extends in a longitudinal direction and at least one blade for machining a workpiece includes providing a base coating on the tool; grinding the at least one blade in a manner that removes the base coating in the region of the at least one blade; and providing a second, fine coating, to the at least one ground blade.

## Claims

### Claim 1

A process for producing a tool having a main body which extends in a longitudinal direction and at least one blade for machining a workpiece, the process comprising:
providing a base coating on the tool;
grinding the at least one blade in a manner that removes the base coating in the region of the at least one blade;
providing a second, fine coating, to the at least one ground blade.

### Claim 2 (depends on 1)

The process of claim 1 wherein the at least one blade is formed during the grinding operation after application of the base coating.

### Claim 3 (depends on 1)

The process of claim 1 wherein the fine coating has a smaller layer thickness than the base coating.

### Claim 4 (depends on 3)

The process of claim 3 wherein the fine coating layer has a layer thickness smaller than the base coating by a factor in the range of 2-10.

### Claim 5 (depends on 3)

The process of claim 3 wherein the fine coating layer has a layer thickness in the range of 1-2 μm.

### Claim 6 (depends on 1)

The process of claim 1 wherein the fine coating is applied with the aid of a vapor depositing process.

### Claim 7 (depends on 1)

The process of claim 1 wherein the tool is a rotational tool.

### Claim 8 (depends on 1)

The process of claim 1 wherein the tool is a drilling/reaming tool, which has on an end face a drilling tip with at least one main drilling blade, formed in particular by grinding, and which also has circumferentially at least one reaming blade, and in which, after the application of the base coating, only the at least one reaming blade is ground.

### Claim 9 (depends on 1)

The process of claim 1 further comprising:
prior to providing a base coating on the tool:
grinding a blank to a desired size, and
grinding main drilling blades and assigned main chip flutes in the blank.

### Claim 10 (depends on 9)

The process of claim 9, wherein grinding the at least one blade in a manner that removes the base coating in the region of the at least one blade does not remove the base coating in the region of the main chip flutes.

### Claim 11 (depends on 1)

The process of claim 1, wherein the base coating has a hardness that is greater than a hardness of the main body.

### Claim 12 (depends on 11)

The process of claim 11, wherein the main body comprises carbide.

### Claim 13 (depends on 1)

The process of claim 1, wherein a coating material of the base coating is the same as a coating material of the fine coating.

### Claim 14 (depends on 1)

The process of claim 1, wherein a coating material of the base coating differs from a coating material of the fine coating.

### Claim 15 (depends on 1)

The process of claim 1, wherein providing a second, fine coating, to the at least one ground blade is performed after grinding the at least one blade.

### Claim 16 (depends on 3)

The process of claim 3, wherein the base coating layer has a layer thickness in the range of 5-15 μm.