Method and apparatus for manufacturing gas-hardened molds
US5887639A · kind A · utility
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3Claims
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Assignee
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Key dates
| Filing date | Oct 23, 1996 |
| Grant date | Mar 30, 1999 |
| Priority date | — |
| Expiry date | Oct 23, 2016 |
Classification
- Technology area (CPC B)Performing Operations; Transporting
- CPC primaryB22C15/23
- WIPO fieldMaterials, metallurgy
- WIPO sectorChemistry
Abstract
A method and apparatus is provided for increasing the packing density and strength of sand for gas-hardening casting molds. The method is characterized by the steps of filling spaces defined by a pattern plate 1 and a mold frame with gas-hardening casting sand 4, depressurizing a closed container 3 after the filled assembly has been conveyed thereinto, introducing air into the container 3, applying a pressure to the upper surface of the casting sand to increase its packing density, and hardening the casting sand by a hardening gas.
Source: USPTO / EPO open patent data. Objective bibliographic and citation counts.