Method of making cores with molding sand
US5850867A · kind A · utility
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1References
3Claims
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Key dates
| Filing date | Apr 14, 1997 |
| Grant date | Dec 22, 1998 |
| Priority date | — |
| Expiry date | Apr 14, 2017 |
Classification
- Technology area (CPC B)Performing Operations; Transporting
- CPC primaryB22C15/23
- WIPO fieldMaterials, metallurgy
- WIPO sectorChemistry
Abstract
A method of filling a core cavity, wherein the entire core cavity is uniformly filled with highly compacted sand for molding the core without the need of providing many ventholes. The method is characterized in that sand for molding the core is drawn into the core cavity through an inlet to preparatorily fill the cavity, and then the thus prepared sand is repeatedly and sequentially compacted by impulsively pressurizing the sand, starting with the sand farthest from the inlet and ending with the sand nearest to the inlet.
Source: USPTO / EPO open patent data. Objective bibliographic and citation counts.