Die for extruding toothed helical members
US4622842A · kind A · utility
Assignee
Inventors
Key dates
| Filing date | Dec 13, 1984 |
| Grant date | Nov 18, 1986 |
| Priority date | — |
| Expiry date | Dec 13, 2004 |
Classification
- Technology area (CPC B)Performing Operations; Transporting
- CPC primaryB21K1/305
- WIPO fieldMachine tools
- WIPO sectorMechanical engineering
Abstract
A die for use in extruding helical gears includes a die orifice at the upper end of the die teeth where the extrusion blank first enters the die. Each tooth is formed with a land directed parallel to the helix on the drive and trail side of the tooth and an end face perpendicular to the helix that intersects either a transition surface, directed perpendicular to the die axis, or a land. Alternatively, the end face can extend entirely across the tooth width from one land to the other without the use of the transition surface. Relief surfaces slope inwardly from the land and provide spaces within which the extrusion blank may expand without undue frictional contact with the die.
Source: USPTO / EPO open patent data. Objective bibliographic and citation counts.