Sprue for a lost foam casting system for biasing a directional fill rate from a bottom portion of a metal casting
US6886621B1 · kind B1 · utility
Assignee
Inventors
Key dates
| Filing date | Aug 29, 2002 |
| Grant date | May 3, 2005 |
| Priority date | — |
| Expiry date | Aug 29, 2022 |
Classification
- Technology area (CPC B)Performing Operations; Transporting
- CPC primaryB22C9/082
- WIPO fieldMaterials, metallurgy
- WIPO sectorChemistry
Abstract
A sprue structure is specifically designed to facilitate the rapid filling of molded polystyrene patterns with molten metal. It comprises a down sprue and parallel columnar members that are connected to the down sprue. The flow of molten metal is initially downward through the first columnar member and then it reverses direction to flow upwardly through second and third columnar members so that the patterns to be cast receive molten metal as it travels upwardly through the second and third columnar members. This decreases the amount of pyrolyzation products that could otherwise flow through in-gates and into the patterns to be cast.
Source: USPTO / EPO open patent data. Objective bibliographic and citation counts.