Method of forging dual alloy billets
US4843856A · kind A · utility
Assignee
Inventors
Key dates
| Filing date | Oct 26, 1987 |
| Grant date | Jul 4, 1989 |
| Priority date | — |
| Expiry date | Oct 26, 2007 |
Classification
- Technology area (CPC Y)Emerging Cross-Sectional Technologies
- CPC primaryY10S72/70
- WIPO fieldMachine tools
- WIPO sectorMechanical engineering
Abstract
An improved forging billet of dual alloys and an improved method for forging a dual alloy billet. The billet is cylindrical in shape having an outer tubular portion of one alloy and another alloy filling the central opening through the tubular portion, the ends of the billet include a radial flange of the tubular alloy extending a short distance outward at each end of the billet and having a skirt extending from the outer end of the radial flange axially away from the body of the billet to form a circular opening at each end of the billet which has at least as large a diameter as the outer diameter of the outer tubular portion, and a sandwich structure positioned within each of said circular opening including a plurality of layers of a powdered lubricant, preferably boron nitride lubricant, separated by foil layers, preferably a high purity nickel foil. The method includes the step of forging a dual alloy billet as described above into a disc having an interface between the two alloys which is substantially straight and generally parallel to the axis of the disc. The steps of the improved method include positioning the billet between the dies, providing lubrication with the billet …
Source: USPTO / EPO open patent data. Objective bibliographic and citation counts.