Investment casting with improved melt filling
US6640877B2 · kind B2 · utility
4Cited by
31References
13Claims
0Family size
Assignee
Inventors
Key dates
| Filing date | Jun 27, 2002 |
| Grant date | Nov 4, 2003 |
| Priority date | — |
| Expiry date | Jun 27, 2022 |
Classification
- Technology area (CPC B)Performing Operations; Transporting
- CPC primaryB22D35/04
- WIPO fieldMaterials, metallurgy
- WIPO sectorChemistry
Abstract
Molten metallic material is cast into a mold that is made with a barrier to reduce gas permeability through a mold wall that forms on its innermost side a mold surface for contacting the molten metallic material. The molten metallic material is gravity cast into the mold residing in a furnace in a casting chamber under a first pressure, such as subambient pressure. Then, a gaseous pressure is provided in the casting chamber higher than the first pressure rapidly enough to reduce or eliminate the presence of localized voids in the casting solidified in the mold.
Source: USPTO / EPO open patent data. Objective bibliographic and citation counts.