Successive cold working process
US5007266A · kind A · utility
Assignee
Inventors
Key dates
| Filing date | Mar 8, 1989 |
| Grant date | Apr 16, 1991 |
| Priority date | — |
| Expiry date | Mar 8, 2009 |
Classification
- Technology area (CPC B)Performing Operations; Transporting
- CPC primaryB21J5/00
- WIPO fieldMachine tools
- WIPO sectorMechanical engineering
Abstract
A billet is successively cold worked into a product such as a countershaft, an outer race for a constant-velocity joint, or the like by forming a chemically converted lubricating coating on a surface of the billet, forging the billet into an intermediate product at a temperature below a transformation temperature of the billet, covering a surface of said intermediate product with lubricating oil in a die cavity in a die assembly, and forging the intermdiate product at a temperature below the transformation temperature and before the intermediate product gains a predetermined hardness due to age hardening resulting from the first forging step.
Source: USPTO / EPO open patent data. Objective bibliographic and citation counts.