Gear machining apparatus

Patent metadata

Field	Value
Publication number	US-9919371-B2
Application number	US-201615202957-A
Country	US
Kind code	B2
Filing date	Jul 6, 2016
Priority date	Jul 9, 2015
Publication date	Mar 20, 2018
Grant date	Mar 20, 2018

Abstract

A gear machining apparatus includes a machining tool having a plurality of protruding tool edges on an outer periphery of the machining tool, and driving apparatuses that form a tooth on a work piece by rotating the machining tool around a central axis thereof, rotating the work piece W around a central axis thereof, and moving the machining tool relative to the work piece. Radial outer faces of the protruding tool edges form multiple steps that are parallel to the central axis of the machining tool such that the diameter of the machining tool increases in a stepwise manner from a tool leading end toward a tool base end of the machining tool.

First claim

What is claimed is:

1. A gear machining apparatus comprising:
a machining tool including a tool edge having a plurality of protruding tool edges on an outer periphery of the machining tool; and
a driving apparatus that forms a tooth on a work piece by rotating the machining tool around a central axis thereof, rotating the work piece around a central axis thereof, and moving the machining tool relative to the work piece; wherein
the driving apparatus sets the central axis of the machining tool and the central axis of the work piece in a skew state, and drives the machining tool straight ahead in a direction of the central axis of the machining tool toward the work piece while synchronizing rotation of the work piece with rotation of the machining tool so as to allow the protruding tool edges to form the tooth on the work piece, and
radial outer faces of the protruding tool edges form multiple steps that are parallel to the central axis of the machining tool such that a diameter of the machining tool increases in a stepwise manner from a tool leading end toward a tool base end of the machining tool, wherein
the machining tool is formed such that circumferential widths of the radial outer faces of the protruding tool edges decrease in a stepwise manner from the tool leading end toward the tool base end of the machining tool, the radial outer faces forming the multiple steps such that the diameter of the machining tool increases in a stepwise manner.

2. The gear machining apparatus according to claim 1 , wherein
in the machining tool, the protruding tool edges forming the multiple steps are integrally formed.

3. The gear machining apparatus according to claim 1 , wherein
in the machining tool, the protruding tool edges forming the multiple steps have the same edge thickness, the same module, and the same number of edges on a pitch circle.

4. The gear machining apparatus according to claim 1 , wherein
in the machining tool, a protruding tool edge of the plurality of protruding tool edges that is nearest the tool leading end is formed for roughing, and a protruding tool edge of the plurality of protruding tool edges that is nearest the tool base end is formed for finishing.

5. The gear machining apparatus according to claim 4 , wherein
in the machining tool, all the protruding tool edges other than the protruding tool edge nearest the tool base end have a same cutting sectional area per edge.

6. The gear machining apparatus according to claim 1 , wherein
when the driving apparatus sets the central axis of the machining tool and the central axis of the work piece in the skew state, a virtual machining point for the work piece is defined to be a machining point for machining with the central axis of the work piece and the central axis of the machining tool arranged parallel to each other, a plane A is defined to be a plane that includes the central axis of the work piece and the virtual machining point for the work piece, a plane B is defined to be a plane that crosses the plane A at right angles and includes the central axis of the work piece, and a plane C is defined to be a plane that crosses the plane A and the plane B at right angles and includes the virtual machining point for the work piece,
when the work piece and the machining tool are projected on the plane C in a normal direction of the plane C, the central axis of the machining tool positioned at the virtual machining point is rotated through a predetermined angle around the central axis of the work piece,
when the work piece and the machining tool are projected on the plane B in a normal direction of the plane B, the central axis of the work piece and the central axis of the machining tool are tilted so as to form a predetermined angle between the central axis of the work piece and the central axis of the machining tool, and
when the work piece and the machining tool are projected on the plane A in a normal direction of the plane A, the central axis of the work piece and the central axis of the machining tool are set parallel to each other.

Assignees

• Jtekt Corp

Inventors

• Natsuda Kazuki
• Otani Hisashi
• Nakano Hiroyuki

Classifications

• B23F5/202 Primary

  the tool having a shape similar to that of a gear or part thereof, with cutting edges situated on the tooth contour lines (tools therefor B23F21/122) · CPC title

• B23F21/122

  having a shape similar to that of a gear or part thereof, with cutting edges situated on the tooth contour lines · CPC title

• B23F5/163

  the tool and workpiece being in crossed axis arrangement, e.g. skiving, i.e. "Waelzschaelen" · CPC title

• B23F5/205

  with plural tools · CPC title

• Y10T409/105565

  Cutting rotating work, the axis of which lies in a plane intersecting the cutter axis · CPC title