# US 8,539,806 B2 · Roll forming method for producing longitudinally toothed profiled bodies in pot-shaped cylindrical workpieces

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- Number: US 8,539,806 B2
- Document ID: US8539806B2
- Status: Granted
- Kind: B2
- Application number: 12/995,245
- Filed: 2009-05-27
- Published: 2011-04-14
- Granted: 2013-09-24
- Earliest claimed: 2008-06-09
- Assignees: ZF Friedrichshafen AG; Allgaier Werke GmbH
- Applicants: Peter Hoehne; Martin Meyer; Ralf Fischer; Andreas Essl
- Inventors: Peter Hoehne; Martin Meyer; Ralf Fischer; Andreas Essl
- Web page: https://patentgrep.com/patent/US8539806B2

## CPC

- B21D 15/02: longitudinally
- B21D 53/28: gear wheels
- B21H 1/04: with rim, e.g. railways wheels {or pulleys}
- B21H 5/02: with cylindrical outline {, e.g. by means of die rolls (worms B21H5/005)}
- B21H 5/025: {Internally geared wheels}
- B21D: WORKING OR PROCESSING OF SHEET METAL OR METAL TUBES, RODS OR PROFILES WITHOUT ESSENTIALLY REMOVING MATERIAL; PUNCHING METAL (working or processing of wire B21F)
- B21H: MAKING PARTICULAR METAL OBJECTS BY ROLLING, e.g. SCREWS, WHEELS, RINGS, BARRELS, BALLS (essentially from sheet metal B21D)

## Abstract

A roll-forming process for producing longitudinally toothed profiled bodies in a pot-shaped cylindrical workpiece in which, during a first rolling process (A), the pot-shaped cylindrical workpiece (1) is moved through a first rolling stage with a bottom (3) of the workpiece being rolled first. During at least one further rolling process (B, C), the workpiece (1) passes through at least one further rolling stage with an open end of the workpiece being rolled first.

## Claims

### Claim 1

A roll-forming process for producing longitudinally toothed profiled bodies in a pot-shaped cylindrical workpiece, the process comprising the steps:
moving substantially an entire axial length of the pot-shaped cylindrical workpiece (1), during a first rolling process (A), axially through a first rolling stage such that a bottom (3) of the workpiece being inserted and rolled first, and a location on a cylindrical wall of the workpiece is roll-formed a first time; and
passing substantially the entire axial length of the workpiece (1), during at least one further rolling process (B, C) following the first rolling process (A), axially through at least one further rolling stage with an open end of the workpiece being inserted and rolled first, and the location on the cylindrical wall of the workpiece is roll-formed a second time.

### Claim 2 (depends on 1)

The roll-forming process according to claim 1, further comprising the step of over-rolling tooth crowns, during the first rolling process (A), to a specified extent in order to avoid bulging of the workpiece during the roll-forming process.

### Claim 3

A roll-forming process for producing a longitudinally toothed profiled bodies in a cylindrical workpiece comprising a cylindrical wall with one axial end having a bottom surface and an opposite axial end being open, the cylindrical wall comprising a plurality of axially extending teeth that are regularly spaced about a circumference of the cylindrical wall, the process comprising the steps of:
conducting the workpiece axially through a first rolling stage with the bottom surface passing and being rolled first so as to over-roll tooth crowns to a specified extent to avoid bulging of the workpiece, roll-forming a location on the cylindrical wall a first time;
conducting the workpiece axially through a second rolling stage with the open end of the workpiece passing and being rolled first so as to direct material of the cylindrical wall to flow toward the bottom surface so as to form shaped teeth; and
conducting the workpiece axially through a third rolling stage with the open end of the workpiece passing and being rolled first so as to shape the workpiece, and roll-forming a location on the cylindrical wall a third time.

### Claim 4 (depends on 3)

The roll-forming process according to claim 3, further comprising the step of the workpiece being approximately cylindrical after the first rolling stage.

### Claim 5 (depends on 3)

The roll-forming process according to claim 3, further comprising the step of, during each rolling stage, passing the entire axial length of the workpiece completely through the rolling stage.

### Claim 6

A roll-forming process for producing longitudinally toothed profiled bodies in a pot-shaped cylindrical workpiece, the process comprising the steps:
moving the pot-shaped cylindrical workpiece (1), during a first rolling process (A), axially through a first rolling stage such that the bottom (3) of the workpiece passing through and being rolled first, and a location on a cylindrical wall of the workpiece is roll-formed a first time; and
passing the workpiece (1) axially through at least one further rolling stage, during at least one further rolling process (B, C) which follows the first rolling process (A), during which the open end of the workpiece passing through and being rolled first so as to direct material of the cylindrical wall to flow toward the bottom surface, and the location on the cylindrical wall of the workpiece is roll-formed a second time.