Cutter for skiving and gear manufacturing method using same

Patent metadata

Field	Value
Publication number	US-10751818-B2
Application number	US-201615776458-A
Country	US
Kind code	B2
Filing date	Aug 4, 2016
Priority date	Mar 25, 2016
Publication date	Aug 25, 2020
Grant date	Aug 25, 2020

Abstract

Provided is a cutter for skiving that includes cutting teeth that are disposed side by side in a longitudinal direction of tooth grooves and have tooth heights set so as to increase from a downstream side toward an upstream side in a cutting direction, and cutting teeth that are disposed side by side in a longitudinal direction of cutting edge grooves and have tooth heights set so as to incrementally increase from a downstream side toward an upstream side in a rotational direction for each number M of tooth trace patterns (where M is the smallest natural number of at least 2) derived by Equation (1) below. St:Sc=M:N (1), where St is a number of the tooth grooves, Sc is a number of the cutting edge grooves, and N is a number of patterns (where N is the smallest natural number) on a cutting face.

First claim

The invention claimed is:

1. A cutter for skiving having a cylindrical shape and configured to generate a gear, comprising:
a plurality of cutting teeth arranged in a circumferential direction;
a tooth groove formed between the cutting teeth circumferentially adjacent to each other, the tooth groove having a helical shape twisting in an axial direction; and
a cutting edge groove formed in each of the cutting teeth such that the cutting tooth is divided into a plurality of sections in a longitudinal direction of the tooth grooves and a plurality of the cutting teeth are provided in an axial direction with a cutting edge and a cutting face formed on each of the cutting teeth on one side thereof in the axial direction;
the cutting teeth disposed side by side in the longitudinal direction of the tooth grooves having tooth heights set to increase from a first side toward a second side in the axial direction; and
the cutting teeth disposed side by side in a longitudinal direction of the cutting edge grooves having tooth heights set to incrementally increase from a downstream side toward an upstream side in a rotational direction for each number M of tooth trace patterns derived by Equation (1):
St:Sc=M:N   (1),

where M being the smallest natural number of at least 2, the M cutting teeth adjacent to one another in the longitudinal direction of the cutting edge grooves having the same heights,
where St is a number of the tooth grooves, Sc is a number of the cutting edge grooves, and N is a number of patterns on the cutting face, N being the smallest natural number,
the tooth trace patterns being the number of shape patterns forming a tooth trace on each of the plurality of cutting teeth disposed side by side in a longitudinal direction of the tooth grooves,
the patterns on the cutting face being the number of shape patterns forming a cutting face on the plurality of cutting teeth disposed side by side in a longitudinal direction of the cutting edge grooves.

2. The cutter for skiving according to claim 1 , wherein an outer periphery of the cutter has a barrel shape configured such that an outside diameter of an axial center portion is greater than an outside diameter of both axial end sides.

3. A gear manufacturing method for manufacturing the gear having a natural number as a value (L/M) obtained by dividing a number L of teeth of the gear by a number M of tooth trace patterns by performing skiving using the cutter for skiving according to claim 1 .

Assignees

• Mitsubishi Heavy Ind Machine Tool Co Ltd

Inventors

• Monden Tetsuji

Classifications

• B23F5/16 Primary

  the tool having a shape similar to that of a spur wheel or part thereof · CPC title

• B23F21/04

  Planing or slotting tools · CPC title

• B23F21/10

  Gear-shaper cutters having a shape similar to a spur wheel or part thereof · CPC title

• B23F5/163

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