Methods for sand core gas evacuation and related systems and apparatus
US9403209B2 · kind B2 · utility
Assignee
Inventors
Key dates
| Filing date | Jan 22, 2013 |
| Grant date | Aug 2, 2016 |
| Priority date | — |
| Expiry date | Jan 22, 2033 |
Classification
- Technology area (CPC B)Performing Operations; Transporting
- CPC primaryB22D27/15
- WIPO fieldMaterials, metallurgy
- WIPO sectorChemistry
Abstract
Methods, systems, and apparatus for reduction of gas pressure within a core, such as a sand casting core package, during a casting process in order to reduce bubble defects. Some embodiments may comprise a mold configured to receive a molten metal to create a metal casting, such as an engine block casting. The mold may comprise a mold core configured to create a cavity within the metal casting. The system may further comprise a filling device configured for delivering a molten metal into the mold for creating the metal casting. The mold core may comprise a material that is permeable to certain gases known to often result in bubble defects. The system may further comprise a vacuum configured to be coupled with the mold to reduce gas pressure within a permeable portion of the mold in order to reduce the incidence of bubble defects within the casting.
Source: USPTO / EPO open patent data. Objective bibliographic and citation counts.