# US 2019/0168316 A1 · Drill and drilling device including the same

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- Number: US 2019/0168316 A1
- Document ID: US20190168316A1
- Status: Published application
- Kind: A1
- Application number: 16/325,503
- Filed: 2017-08-28
- Published: 2019-06-06
- Earliest claimed: 2016-12-01
- Assignees: Mitsubishi Heavy Industries, Ltd.
- Applicants: Mitsubishi Heavy Industries, Ltd.
- Inventors: Shuichi OKADA
- Web page: https://patentgrep.com/patent/US20190168316A1

## CPC

- B23B 51/101: {Deburring tools (B23B51/103 takes precedence)}
- B23B 45/008: {Gear boxes, clutches, bearings, feeding mechanisms or like equipment}
- B23B 51/02: Twist drills
- B23B 51/102: {Back spot-facing or chamfering}
- B23B 51/108: {having a centering drill}
- B23B 51/08: Drills combined with tool parts or tools for performing additional working {(B23G5/20 takes precedence)}
- B23B 2215/04: Aircraft components
- B23B 2220/08: Deburring
- B23B 2251/046: Variable
- B23B: TURNING; BORING (arrangements for copying or controlling B23Q)

## Abstract

Provided is a drill that can drill with good accuracy without over-processing during deburring. The drill includes: a drill main body that is rotated around a central axis; a main cutting edge provided at a leading end of the drill main body; and a deburring cutting edge that is provided on a base end side of the drill main body, adjacent to the main cutting edge, and performs deburring. The deburring cutting edge is similar in diameter to the main cutting edge and has an angle (β) smaller than an angle (α) formed by the main cutting edge relative to the central axis.

## Claims

### Claim 1

A drill comprising:
a drill main body that is rotated around a central axis;
a main cutting edge provided at a leading end of the drill main body; and
a deburring portion that is provided on a base end side of the drill main body, adjacent to the main cutting edge, and performs deburring, wherein
the deburring portion is provided with a deburring cutting edge that is similar in diameter to the main cutting edge and has an angle smaller than an angle formed by the main cutting edge relative to the central axis.

### Claim 2

A drill comprising:
a drill main body that is rotated around a central axis;
a main cutting edge provided at a leading end of the drill main body; and
a deburring portion that is provided on a base end side of the drill main body, adjacent to the main cutting edge, and performs deburring, wherein
the deburring portion has a tapered surface of which a diameter decreases in a direction away from the main cutting edge.

### Claim 3 (depends on 1)

A drilling device comprising:
the drill according to claim 1;
a rotating shaft that is fixed to the drill main body and applies a torque to the drill main body; and
a rotation speed varying unit that varies a rotation speed of the rotating shaft, wherein
the rotation speed varying unit rotates the rotating shaft at a first rotation speed when drilling is performed by the main cutting edge, and rotates the rotating shaft at a second rotation speed that is a rotation speed lower than the first rotation speed when deburring is performed by the deburring portion.

### Claim 4 (depends on 2)

A drilling device comprising:
the drill according to claim 2;
a rotating shaft that is fixed to the drill main body and applies a torque to the drill main body; and
a rotation speed varying unit that varies a rotation speed of the rotating shaft, wherein
the rotation speed varying unit rotates the rotating shaft at a first rotation speed when drilling is performed by the main cutting edge, and rotates the rotating shaft at a second rotation speed that is a rotation speed lower than the first rotation speed when deburring is performed by the deburring portion.