Method and apparatus for sand moulding composite articles with a die made of light alloy and a fibrous insert
US4889177A · kind A · utility
Assignee
Inventors
Key dates
| Filing date | Jun 7, 1988 |
| Grant date | Dec 26, 1989 |
| Priority date | — |
| Expiry date | Jun 7, 2008 |
Classification
- Technology area (CPC B)Performing Operations; Transporting
- CPC primaryB22D18/08
- WIPO fieldMaterials, metallurgy
- WIPO sectorChemistry
Abstract
The invention relates to a method and apparatus for sand molding composite articles formed of a light alloy metal and fibrous insert. A sand mold is formed containing a fibrous preform separated from the walls of the mold cavity. The mold is fed by means of a tube dipping into a liquid metallic bath therebelow. In the molding process, the pressure in the mold cavity and above the bath are reduced, and the pressure above the bath is increased to create a positive pressure differential .DELTA.P, thereby forcing molten metal from the bath into the mold cavity. The pressure in the mold cavity and above the bath are then increased to above atmospheric, and the pressure differential .DELTA.P is maintained until the metal in the mold cavity solidifies.
Source: USPTO / EPO open patent data. Objective bibliographic and citation counts.