US3830282A
Expired / Lapsed
US
⏱️ 0.0 years remaining
System for feedback control of casting speed
Assignee: United States Steel Corp
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Filing: 1972-10-31
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Granted: 1974-08-20
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Expires: 1992-10-31
Abstract
Abstract A string casting process with vacuum degassing uses vessel repressurization to provide uniform outflow of molten metal to a continuous-casting mold, a first operator initiated signal controls the pump-down of a degassing vessel, the admission of metal to the vessel at a desired pump-down pressure and the rate of degassing. When the degassing of each batch is complete, a second operator initiated signal controls the closing of a sliding gate valve to seal the vessel, the admission of repressurization gas into the vessel and the repressurization of the vessel to provide a uniform flow from the vessel by comparing the actual casting speed with a desired casting speed.
Inventors
- 👤 R Schultz
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-10-26 12:48
CPC Classifications
B; B22; B22D; B22D11/00; B22D11/16
Claims Analysis
Total Claims: 6
Claim 1
Independent Claim
248 words
In a string casting process, apparatus for controlling the degassing of molten metal and flow rate from a bottom pour degassing vessel into a continuous casting mold having means for controlling pinch rolls withdrawing the strand from the mold comprising a gate valve for admitting molten metal into the vessel, means connected to said valve for opening and closing the gate valve, means connected to said vessel and responsive to a first operator initiated signal for exhausting gas from the vessel, means for determining the gas pressure inside said vessel, means connected to said means for determining pressure and said means for opening and closing said gate valve for opening said gate valve in response to the exhausting of gas below a first desired vessel pressure thereby beginning the discharge of a batch of molten metal into the vessel, means connected to said vessel for admitting gas under pressure into said vessel, means connected to said means for opening and closing the gate valve, said means for exhausting gas and said means for admitting gas and responsive to a second operator initiated signal at the conclusion of the discharge of a batch of molten metal into the vessel for closing the gate, discontinuing the exhausting of gas and beginning the admitting of gas under pressure into the vessel, and means connected to said means for admitting gas and the means for controlling the pinch rolls for admitting gas in response to withdrawal of the strand from the mold.
Claim 2
Dependent Claim
248 words
In a string casting process, apparatus for controlling the degassing of molten metal and flow rate from a bottom pour degassing vessel into a continuous casting mold having means for controlling pinch rolls withdrawing the strand from the mold comprising a gate valve for admitting molten metal into the vessel, means connected to said valve for opening and closing the gate valve, means connected to said vessel and responsive to a first operator initiated signal for exhausting gas from the vessel, means for determining the gas pressure inside said vessel, means connected to said means for determining pressure and said means for opening and closing said gate valve for opening said gate valve in response to the exhausting of gas below a first desired vessel pressure thereby beginning the discharge of a batch of molten metal into the vessel, means connected to said vessel for admitting gas under pressure into said vessel, means connected to said means for opening and closing the gate valve, said means for exhausting gas and said means for admitting gas and responsive to a second operator initiated signal at the conclusion of the discharge of a batch of molten metal into the vessel for closing the gate, discontinuing the exhausting of gas and beginning the admitting of gas under pressure into the vessel, and means connected to said means for admitting gas and the means for controlling the pinch rolls for admitting gas in response to withdrawal of the strand from the mold.
Claim 3
Dependent Claim
46 words
Apparatus according to claim 1 in which said means for admitting gas includes a source of pressurized gas, a gas line connecting said source to the vessel and a valve in said line and which includes means responsive to said first signal for closing said valve.
Claim 4
Dependent Claim
51 words
Apparatus according to claim 2 in which the means for exhausting gas includes means connected to said means for determining the gas pressure in said vessel for reducing the rate of exhausting gas established in response to said first signal when the vessel pressure is below said first desired vessel pressure.
Claim 5
Dependent Claim
37 words
Apparatus according to claim 3 which includes means connected to said means for determining the gas pressure inside said vessel for maintaining the rate of admitting gas whenever the vessel pressure exceeds a second desired vessel pressure.
Claim 6
Dependent Claim
33 words
Apparatus according to claim 4 which includes manual means for controlling said gas valve, manuAl means for operating said means for exhausting gas and manual means for opening and closing said gate valve.
References Cited (Backward Citations)
US3480073A
Cited
US3627021A
Cited
USPTO Annuity & Maintenance Windows
| Annuity Stage | Window Opens | Payment Deadline | Surcharge Period Until | Estimated Fee | Status |
|---|---|---|---|---|---|
| 3.5 Years (Year 4) | 1977-08-19 | 1978-02-18 | 1978-08-20 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1981-08-19 | 1982-02-18 | 1982-08-20 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1985-08-19 | 1986-02-18 | 1986-08-20 | $7700.00 | Window Closed / Lapsed |