Facing sand composition and method of incorporation in a mold
US6669770B1 · kind B1 · utility
Inventor
Key dates
| Filing date | Dec 26, 2002 |
| Grant date | Dec 30, 2003 |
| Priority date | — |
| Expiry date | Dec 26, 2022 |
Classification
- Technology area (CPC B)Performing Operations; Transporting
- CPC primaryB22C1/00
- WIPO fieldMaterials, metallurgy
- WIPO sectorChemistry
Abstract
A sand casting facing composition comprises a dry mixture of about 77% fine sand, 5% binder, 6% green system sand and 12% burned system sand. The fine sand is mulled with 5.8% wt/wt oil per total dry mixture and catalyst at about 0.5% wt/wt. Preferably, fine sand and binder are mulled with oil, catalyst, green system sand and screened burned system. The mulled mixture is rested, mulled again and rested again before use as facing sand for achieving accurate reproduction of the pattern's fine detail. A method of preparing the mold and preserving fine detail comprises riddling the pattern with a thin layer of the facing sand composition, compacting, riddling with dry system sand and riddling with system sand before compacting about the periphery of the pattern. Final layers of system sand are applied and compacted over the entire pattern.
Source: USPTO / EPO open patent data. Objective bibliographic and citation counts.