Patent US3786856A successfully refreshed from Google Patents.
US3786856A
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Method for controlling a continuous casting installation in the event of molten metal breakout
Assignee: SMS Concast AG
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Filing: 1972-02-04
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Granted: 1974-01-22
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Expires: 1992-02-04
Abstract
Abstract A method for controlling a continuous casting installation in the event of molten metal breakout wherein during the casting operation the light intensity at the secondary cooling zone of the continuously cast strand is monitored, changes in the light intensity with predetermined threshold values are compared and upon exceeding any such predetermined threshold values electrical signals are produced by means of which it is possible to control the continuous casting operation.
Inventors
- 👤 T Nishikawa
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-11-05 08:49
CPC Classifications
B; B22; B22D; B22D11/00; B22D11/16; B22D11/20; B22D11/207; B22D11/14; B22D11/148
Claims Analysis
Total Claims: 10
Claim 1
Independent Claim
150 words
A method of controlling a continuous casting installation in the event of metal breakout, comprising the steps of conTinuously casting a strand, determining incipient metal breakout by monitoring during the casting operation the light intensity at the secondary cooling zone for the continuously cast strand at the location of such secondary cooling zone where cooling of the strand with water spray occurs, comparing changes in the light intensity with predetermined threshold values, obtaining electrical signals in response to the light intensity exceeding a threshold value owing to incipient metal breakout, and controlling the continuous casting operation to counteract against metal breakout in response to the electrical signals, said step of controlling the continuous casting operation including: a. at least briefly interrupting the feed of molten metal to the casting mold, and thereafter continuing the casting operation at a reduced withdrawal speed with throttled feed of the metal to the mold.
Claim 2
Independent Claim
150 words
A method of controlling a continuous casting installation in the event of metal breakout, comprising the steps of conTinuously casting a strand, determining incipient metal breakout by monitoring during the casting operation the light intensity at the secondary cooling zone for the continuously cast strand at the location of such secondary cooling zone where cooling of the strand with water spray occurs, comparing changes in the light intensity with predetermined threshold values, obtaining electrical signals in response to the light intensity exceeding a threshold value owing to incipient metal breakout, and controlling the continuous casting operation to counteract against metal breakout in response to the electrical signals, said step of controlling the continuous casting operation including: a. at least briefly interrupting the feed of molten metal to the casting mold, and thereafter continuing the casting operation at a reduced withdrawal speed with throttled feed of the metal to the mold.
Claim 3
Independent Claim
146 words
A method of controlling a continuous casting installation in the event of metal breakout, comprising the steps of continuously casting a strand, monitoring during the casting operation the light intensity at the secondary cooling zone for the continuously cast strand, comparing changes in the light intensity with predetermined threshold values, upon exceeding a threshold value obtaining electrical signals by means of which it is possible to control the continuous casting operation and to counteract against metal breakout, wherein said predetermined threshold values comprise a first threshold value and wherein upon exceeding said first threshold value interrupting the feed of metal to the casting mold, briefly interrupting the withdrawal of the continuously cast strand, thereafter further moving the strand at a reduced withdrawal speed, and when the light intensity falls below said first threshold value continuing the casting operation with throttled feed of metal to the mold.
Claim 4
Independent Claim
146 words
A method of controlling a continuous casting installation in the event of metal breakout, comprising the steps of continuously casting a strand, monitoring during the casting operation the light intensity at the secondary cooling zone for the continuously cast strand, comparing changes in the light intensity with predetermined threshold values, upon exceeding a threshold value obtaining electrical signals by means of which it is possible to control the continuous casting operation and to counteract against metal breakout, wherein said predetermined threshold values comprise a first threshold value and wherein upon exceeding said first threshold value interrupting the feed of metal to the casting mold, briefly interrupting the withdrawal of the continuously cast strand, thereafter further moving the strand at a reduced withdrawal speed, and when the light intensity falls below said first threshold value continuing the casting operation with throttled feed of metal to the mold.
Claim 5
Dependent Claim
41 words
The method as defined in claim 2, wherein said predetermined threshold values include a second threshold value, and upon exceeding said second threshold value further reducing the smaller withdrawal speed and increasing the supply of water into the secondary cooling zone.
Claim 6
Dependent Claim
46 words
The method as defined in claim 3, wherein said predetermined threshold values include a third threshold value, and upon exceeding said third threshold value completely interrupting the withdrawal of the continuously cast strand, triggering an alarm signal and switching-over the continuous casting installation to manual operation.
Claim 7
Dependent Claim
57 words
The method as defined in claim 2, further including the steps of stepwise switching-back the continuous casting installation to operate at the casting parameters which prevailed prior to the breakout upon attaining a normal light intensity for the continuous casting installation which operation corresponds to the casting operation which prevailed without the presence of molten metal breakout.
Claim 8
Dependent Claim
30 words
The method as defined in claim 1, further including the step of using photoelectric transmitter means for determining the light intensity at the secondary cooling zone during the casting operation.
Claim 9
Independent Claim
145 words
A method of monitoring a continuous casting installation for the presence of breakout of molten metal from the continuously cast strand, comprising the steps of determining the light intensity prevailing at a predetermined zone of the continuous casting installation where cooling of the strand with water spray occurs, comparing the momentarily prevailing light intensity with at least one predetermined threshold value, producing an electrical control signal in response to the light intensity exceeding a threshold value owing to incipient metal breakout, and controlling further operation of the continuous casting installation to act against metal breakout in response to said control signal, said step of controlling the continuous casting operation including: a. at least briefly interrupting the feed of molten metal to the casting mold, and b. thereafter continuing the casting operation at a reduced withdrawal speed with throttled feed of the metal to the mold.
Claim 10
Independent Claim
145 words
A method of monitoring a continuous casting installation for the presence of breakout of molten metal from the continuously cast strand, comprising the steps of determining the light intensity prevailing at a predetermined zone of the continuous casting installation where cooling of the strand with water spray occurs, comparing the momentarily prevailing light intensity with at least one predetermined threshold value, producing an electrical control signal in response to the light intensity exceeding a threshold value owing to incipient metal breakout, and controlling further operation of the continuous casting installation to act against metal breakout in response to said control signal, said step of controlling the continuous casting operation including: a. at least briefly interrupting the feed of molten metal to the casting mold, and b. thereafter continuing the casting operation at a reduced withdrawal speed with throttled feed of the metal to the mold.
References Cited (Backward Citations)
USPTO Annuity & Maintenance Windows
| Annuity Stage | Window Opens | Payment Deadline | Surcharge Period Until | Estimated Fee | Status |
|---|---|---|---|---|---|
| 3.5 Years (Year 4) | 1977-01-21 | 1977-07-23 | 1978-01-22 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1981-01-21 | 1981-07-23 | 1982-01-22 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1985-01-21 | 1985-07-23 | 1986-01-22 | $7700.00 | Window Closed / Lapsed |