Molten metal admission control in casting
US5709260A · kind A · utility
Assignee
Inventors
Key dates
| Filing date | Aug 22, 1995 |
| Grant date | Jan 20, 1998 |
| Priority date | — |
| Expiry date | Aug 22, 2015 |
Classification
- Technology area (CPC B)Performing Operations; Transporting
- CPC primaryB22D11/181
- WIPO fieldMaterials, metallurgy
- WIPO sectorChemistry
Abstract
To control the admission of molten metal to a series of mold cavities through a series of valve openings in the downspouts of a trough thereabove, an elongated rack is arranged parallel to the trough, a set of balance beams is pivotally mounted on the rack, a set of valve closure devices is suspended from corresponding first end portions of the beams for throttling the openings, and a set of float sensors is suspended from points on the opposing second end portions of the beams for contact with the surfaces of the molten metal in the cavities. After an initial phase of the fill operation in which the surfaces of the molten metal reach a state of equilibrium at an intermediate elevation above the tops of the blocks, the rack is elevated in relation to the series of cavities so that as the first end portions of the beams impose a desired value on the rate at which the surfaces escalate up the vertical axes of the cavities, the second end portions raise the elevation of the suspension points for the sensors at a rate commensurate therewith so that the input signals transmitted to the first portions from the second portions through the fulcra for the beams, are consistent with the impo…
Source: USPTO / EPO open patent data. Objective bibliographic and citation counts.