# US 2010/0150677 A1 · Rotary Cutting Tool and Method For Manufacturing Such a Rotary Cutting Tool

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- Number: US 2010/0150677 A1
- Document ID: US20100150677A1
- Status: Published application
- Kind: A1
- Application number: 12/087,875
- Filed: 2007-01-15
- Published: 2010-06-17
- Earliest claimed: 2006-01-17
- Assignees: Sakai Threading Tool Co., Ltd.
- Inventors: Hitoshi Yamaguchi
- Web page: https://patentgrep.com/patent/US20100150677A1

## CPC

- B23P 15/52: taps
- B23G 5/06: Taps (chucks therefor B23B31/00)
- B23G 2200/26: Coatings of tools
- B23G 2225/32: High speed steel
- B23G 2225/52: Titanium carbide
- B23G 2225/56: Titanium carbide nitride (TiCN)
- B23G 2225/60: Titanium nitride
- Y10T 29/49826: Assembling or joining
- Y10T 408/78: Tool of specific diverse material
- Y10T 408/9048: Extending outwardly from tool-axis
- B23P: METAL-WORKING NOT OTHERWISE PROVIDED FOR; COMBINED OPERATIONS; UNIVERSAL MACHINE TOOLS (arrangements for copying or controlling B23Q)
- B23G: THREAD CUTTING; WORKING OF SCREWS, BOLT HEADS, OR NUTS, IN CONJUNCTION THEREWITH (making helical grooves by turning B23B5/48, by milling B23C3/32, by forging, pressing, or hammering B21K1/56, by grinding B24B19/02; arrangements for copying or controlling B23Q; thread-forming by corrugating tubes B21D15/04, by rolling B21H3/02)
- Y10T: TECHNICAL SUBJECTS COVERED BY FORMER US CLASSIFICATION

## Abstract

A rotary cutting tool is provided which is less likely to cause chips to get stuck, and which can be manufactured at a low cost. The rotary cutting tool includes a body having a relief surface (6) and a rake face (7) which is connected to the relief surface (6). An oxide film (9) is formed on the rake face (7) by oxidizing the surface of the body, and a hard film (8) is formed on the relief surface (6) and the oxide film (9). The hard film (8) is made of a metal carbide, a metal nitride, a metal carbonitride, or a solid solution thereof.

## Claims

### Claim 1

A rotary cutting tool comprising a body having a relief surface (6) and a rake face (7) which is connected to said relief surface (6), wherein an oxide film (9) is formed on said rake face (7) by oxidizing the surface of the body, and wherein a hard film (8) is formed on said relief surface (6) and said oxide film (9), said hard film (8) comprising a metal carbide, a metal nitride, a metal carbonitride, or a solid solution thereof.

### Claim 2 (depends on 1)

The rotary cutting tool of claim 1 wherein said rake face (7) is matt-finished.

### Claim 3 (depends on 1)

The rotary cutting tool of claim 1 wherein said rotary cutting tool is a tap.

### Claim 4

A method of manufacturing a rotary cutting tool comprising a body (10), said method comprising the steps of forming a rake face (7) on said body (10), oxidizing, after forming the rake face, a portion of the surface of the body including said rake face (7) to form an oxide film thereon, cutting, after forming said oxide film, an outer periphery of said body (10) to form a relief surface (6), coating, after forming the relief surface, a portion of the surface of the body including said relief surface (6) with a metal carbide, a metal nitride, a metal carbonitride, or a solid solution thereof.

### Claim 5 (depends on 4)

The method of manufacturing a rotary cutting tool of claim 4 wherein before forming said oxide film, said rake face (7) is roughened by a matt finish step.

### Claim 6 (depends on 5)

The method of manufacturing a rotary cutting tool of claim 5 wherein said matt finish step comprises the step of roughening the rake face (7) by shot blasting.

### Claim 7 (depends on 4)

The method of manufacturing a rotary cutting tool of claim 4 wherein said rotary cutting tool is a tap.

### Claim 8 (depends on 2)

The rotary cutting tool of claim 2 wherein said rotary cutting tool is a tap.

### Claim 9 (depends on 5)

The method of manufacturing a rotary cutting tool of claim 5 wherein said rotary cutting tool is a tap.

### Claim 10 (depends on 6)

The method of manufacturing a rotary cutting tool of claim 6 wherein said rotary cutting tool is a tap.