US3768542A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Level control in continuous casting
Assignee: British Steel Corp
•
Filing: 1971-06-18
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Granted: 1973-10-30
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Expires: 1991-06-18
Abstract
Abstract Continuous casting of metal, particularly upward pressure casting of metal, in which molten metal is passed from a melting vessel to a mould from which the solidified metal is continuously extracted, wherein pressure changes in the molten metal at a predetermined position within the vessel are detected and the pressure of the molten metal at the inlet to the mould is thereby controlled so as to be substantially constant. The molten metal pressure is preferably controlled by controlling the flow of pressurising gas to the vessel.
Inventors
- 👤 C Bosworth
- 👤 W Duguid
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-10-26 17:13
CPC Classifications
B; B22; B22D; B22D18/00; B22D18/08; B22D11/00; B22D11/14; B22D11/145
Claims Analysis
Total Claims: 4
Claim 1
Independent Claim
191 words
Apparatus for the continuous casting of metal comprising a pressure vessel for containing molten metal; means for providing super-atmospheric pressure within the pressure vessel; a mold having an inlet communicating with the interior of the vessel for receiving molten metal from the vessel; means for continuously extracting solidified metal from the mold; pressure sensitive means including a tube arranged to dip below the surface of the molten metal to a predetermined level in the pressure vessel; means for passing gas through the tube into the molten metal; and control means including a differential pressure measuring instrument having an inlet connected to the tube and another inlet connected through a pressure control valve to a source of gas under pressure; the differential pressure measuring instrument having an output connected to a pressure controller arranged to control the flow of pressurizing gas into the pressure vessel whereby the molten-metal pressure at the inlet to the mold is maintained substantially constant and including a further differential pressure measuring instrument connected between the interior of the pressure vessel and the tube to respond to changes in the pressure difference between the vessel and the tube.
Claim 2
Dependent Claim
191 words
Apparatus for the continuous casting of metal comprising a pressure vessel for containing molten metal; means for providing super-atmospheric pressure within the pressure vessel; a mold having an inlet communicating with the interior of the vessel for receiving molten metal from the vessel; means for continuously extracting solidified metal from the mold; pressure sensitive means including a tube arranged to dip below the surface of the molten metal to a predetermined level in the pressure vessel; means for passing gas through the tube into the molten metal; and control means including a differential pressure measuring instrument having an inlet connected to the tube and another inlet connected through a pressure control valve to a source of gas under pressure; the differential pressure measuring instrument having an output connected to a pressure controller arranged to control the flow of pressurizing gas into the pressure vessel whereby the molten-metal pressure at the inlet to the mold is maintained substantially constant and including a further differential pressure measuring instrument connected between the interior of the pressure vessel and the tube to respond to changes in the pressure difference between the vessel and the tube.
Claim 3
Dependent Claim
50 words
Apparatus according to claim 1 wherein the mould is located above the pressure vessel such that in operation molten metal is forced upwardly into the mould by the super-atmospheric pressure within the pressure vessel, the control means serving to maintain the level of molten metal in the mould substantially constant.
Claim 4
Dependent Claim
25 words
Apparatus according to claim 1 wherein the means for continuously extracting solidified metal from the mould is adapted to extract the metal in tubular form.
References Cited (Backward Citations)
US2990592A
Cited
US3287773A
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US3412899A
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US3425483A
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US3459254A
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US3499580A
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USPTO Annuity & Maintenance Windows
| Annuity Stage | Window Opens | Payment Deadline | Surcharge Period Until | Estimated Fee | Status |
|---|---|---|---|---|---|
| 3.5 Years (Year 4) | 1976-10-29 | 1977-04-30 | 1977-10-30 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1980-10-29 | 1981-04-30 | 1981-10-30 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1984-10-29 | 1985-04-30 | 1985-10-30 | $7700.00 | Window Closed / Lapsed |