Bi-metallic extrusion billet preforms and method and apparatus for producing same
US5207776A · kind A · utility
Assignee
Inventor
Key dates
| Filing date | Oct 4, 1991 |
| Grant date | May 4, 1993 |
| Priority date | — |
| Expiry date | Oct 4, 2011 |
Classification
- Technology area (CPC B)Performing Operations; Transporting
- CPC primaryB22D19/16
- WIPO fieldMaterials, metallurgy
- WIPO sectorChemistry
Abstract
A bi-metallic extrusion billet perform is produced in a single casting. An inner core made of a desired material is placed in the center of a crucible or mold as a prepared bar. Molten cladding material is cast into an annular area between the outside surface of the inner core and an inner surface of the crucible or mold. Bottom pouring is enabled through the center of the inner core, which has been appropriately provided with a hole of a size that is consistent with the extrusion press and the required extruded hollow size involved in later manufacturing steps. The entire operation, including the melting of the cladding material, is advantageously performed under a vacuum to eliminate the risk of trapping air at an interface between the inner core and the cladding material cost therearound.
Source: USPTO / EPO open patent data. Objective bibliographic and citation counts.