Method for preparing negative pressure film-covering frozen sand mold
US12128474B2 · kind B2 · utility
Assignee
Inventors
Key dates
| Filing date | Sep 5, 2022 |
| Grant date | Oct 29, 2024 |
| Priority date | — |
| Expiry date | Sep 5, 2042 |
Classification
- Technology area (CPC B)Performing Operations; Transporting
- CPC primaryB22C9/12
- WIPO fieldMaterials, metallurgy
- WIPO sectorChemistry
Abstract
A method for preparing a negative pressure film-covering frozen sand mold includes: directly obtaining a mold cavity of a sand mold through numerically controlled machining of a frozen sand blank; covering a surface, brushed with a thermal insulation coating, of the mold cavity of the sand mold with a softened thin film, and covering an outer surface of the sand mold with a back film to seal a sand box; fixing the frozen sand mold in an air extraction sand box with a vacuum chamber, and extracting air through a vacuum pump, so that the thin film tightly adheres to the sand mold through vacuum suction force; and closing the box to obtain an integral sand mold, and pouring a casting at room temperature or low temperature under negative pressure. The method is environment-friendly, and the prepared frozen sand mold has high strength and is convenient for sand cleaning.
Source: USPTO / EPO open patent data. Objective bibliographic and citation counts.