# US 2012/0237307 A1 · Boring tool

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- Number: US 2012/0237307 A1
- Document ID: US20120237307A1
- Status: Published application
- Kind: A1
- Application number: 13/502,046
- Filed: 2010-08-23
- Published: 2012-09-20
- Earliest claimed: 2009-10-16
- Assignees: Mitsubishi Heavy Industries, Ltd.
- Inventors: Haruhiko Niitani
- Web page: https://patentgrep.com/patent/US20120237307A1

## CPC

- B23B 29/02: Boring bars
- B23B 29/027: {Steadies for boring bars (auxiliary devices, e.g. steadies, rests B23Q1/76)}
- B23B 2215/24: Components of internal combustion engines (B23B2215/16 and B23B2215/20 take precedence)
- B23B 2222/28: Details of hard metal, i.e. cemented carbide
- B23B 2226/275: Carbon fibre reinforced carbon composites
- B23B 2228/10: Coatings
- B23B 2270/16: Constructions comprising three or more similar components
- Y10S 408/708: Drilling opening for bearing in engine block
- Y10T 408/89: Tool or Tool with support
- Y10T 408/95: with tool-retaining means
- B23B: TURNING; BORING (arrangements for copying or controlling B23Q)
- Y10S: TECHNICAL SUBJECTS COVERED BY FORMER USPC CROSS-REFERENCE ART COLLECTIONS [XRACs] AND DIGESTS
- Y10T: TECHNICAL SUBJECTS COVERED BY FORMER US CLASSIFICATION

## Abstract

Provided is a boring tool which not only is lightweight but also has both abrasion resistance and high stiffness. More specifically, provided is a boring tool wherein a shaft-like tool body (10) is equipped with cutting bits, and wherein the tool body (10) makes a reciprocating motion, thereby reaming a hole provided to a workpiece to be machined. The tool body (10) is provided with a substrate (11) formed by a carbon fiber reinforced composite material, a hard plating layer (13) consisting of hard plating applied to the surface (10b) of the tool body (10), and a backing layer (12) which is applied between the substrate (11) and the hard plating layer (13) and serves to improve the wettability of the hard plating layer (13).

## Claims

### Claim 1

A boring tool including a shaft-like tool body equipped with a cutting bit, the tool body making a reciprocating motion in an axial direction to bore a hole provided in a workpiece to be machined, wherein
the tool body is provided with a substrate formed from a carbon fiber reinforced composite material, a hard plating layer consisting of hard plating applied to a surface of the tool body, and a backing layer which is applied between the substrate and the hard plating layer and consists of an undercoat for improving wettability of the hard plating, or
the tool body is provided with a substrate formed from a carbon fiber reinforced composite material, and a thermal-sprayed coating layer formed by thermal-spraying the surface of the tool body with a hard powder.

### Claim 2 (depends on 1)

The boring tool according to claim 1, wherein the tool body is formed to be hollow.

### Claim 3 (depends on 1)

The boring tool according to claim 1, wherein the hard plating is hard chromium plating.

### Claim 4 (depends on 1)

The boring tool according to claim 1, wherein the undercoat is copper plating, iron plating, or chromium plating.

### Claim 5 (depends on 1)

The boring tool according to claim 1, wherein the hard powder contains at least one of tungsten carbide (WC), cobalt (Co) and Nickel (Ni).

### Claim 6 (depends on 1)

The boring tool according to claim 1, wherein
a fixing hole for fixing the cutting bit is provided in the tool body, and
the cutting bit is equipped with a cutting tip for machining the workpiece, a holding implement for holding the cutting tip, and a fixing implement inserted into the fixing hole for fixing the holding implement to the tool body.