Process for the lost foam casting, under low pressure, of aluminium alloy articles
US5161595A · kind A · utility
Assignee
Inventor
Key dates
| Filing date | Apr 24, 1991 |
| Grant date | Nov 10, 1992 |
| Priority date | — |
| Expiry date | Apr 24, 2011 |
Classification
- Technology area (CPC B)Performing Operations; Transporting
- CPC primaryB22D27/13
- WIPO fieldMaterials, metallurgy
- WIPO sectorChemistry
Abstract
A pattern of an aluminum alloy article made from a foam of an organic substance. The pattern is immersed in a mold of dry sand containing no binder. The mold is filled with molten aluminum alloy from a feeder zone and the alloy is allowed to solidify, thereby creating at least one critical zone in which solidification takes place last. Before the solidified fraction of metal exceeds 40% by weight, an isostatic gas pressure is applied to the mold. The aluminum alloy has a solidification range higher than 30.degree. C. and a ratio R of the distance between the feeder zone and at least one critical zone to half the means thickness of the article over this distance is greater than 10. The isostatic gas pressure being applied is between 0.1 and 0.5 MPa.
Source: USPTO / EPO open patent data. Objective bibliographic and citation counts.