US3812900A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Method of operating a multi-roll casting machine during and after freezing of the liquid core of the strand
Assignee: SMS Concast AG
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Filing: 1972-06-29
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Granted: 1974-05-28
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Expires: 1992-06-29
Abstract
Abstract A method of and apparatus for operating a multiple-roll machine, especially a multiple-roll withdrawing machine or a multiple-roll combination withdrawing and straightening machine in a continuous casting plant, wherein a casting and a dummy bar are passed between pairs of rolls. By means of each pair of rolls there is applied to the casting and the dummy bar as they pass therebetween, the requisite contact pressure for generating the necessary traction or withdrawal force. When the thickness of the casting falls below a prescribed thickness there is applied to the casting only a contact pressure of a magnitude required for traction and when the thickness of the casting exceeds the prescribed thickness the contact pressure is increased to a greater value calculated to again reduce the thickness of the casting to the prescribed thickness.
Inventors
- 👤 G Bollig
- 👤 H Grothe
- 👤 J Zeller
- 👤 B Knell
- 👤 A Thalmann
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-11-06 02:25
CPC Classifications
B; B22; B22D; B22D11/00; B22D11/16; B22D11/20; B22D11/208; B22D11/12; B22D11/128; B22D11/1282
Claims Analysis
Total Claims: 5
Claim 1
Independent Claim
152 words
A method of operating a multiple-roll machine, especially a multiple-roll withdrawing machine or a multiple-roll combination withdrawing and straightening machine in a continuous casting plant, during freezing of the liquid core and after the liquid core has frozen, comprising the steps of passing a casting and a dummy bar between pairs of rolls, driving at least some of said rolls, by means of each pair of rolls applying to the casting and the dummy bar as they pass therebetween, the requisite contact pressure for generating the necessary withdrawal force for the casting, and when the thickness of the casting falls below a prescribed thickness applying to the casting only a contact pressure of a magnitude required for withdrawal of the casting and when the thickness of the casting exceeds the prescribed thickness increasing the contact pressure to a greater value to again reduce the thickness of the casting to said prescribed thickness.
Claim 2
Independent Claim
152 words
A method of operating a multiple-roll machine, especially a multiple-roll withdrawing machine or a multiple-roll combination withdrawing and straightening machine in a continuous casting plant, during freezing of the liquid core and after the liquid core has frozen, comprising the steps of passing a casting and a dummy bar between pairs of rolls, driving at least some of said rolls, by means of each pair of rolls applying to the casting and the dummy bar as they pass therebetween, the requisite contact pressure for generating the necessary withdrawal force for the casting, and when the thickness of the casting falls below a prescribed thickness applying to the casting only a contact pressure of a magnitude required for withdrawal of the casting and when the thickness of the casting exceeds the prescribed thickness increasing the contact pressure to a greater value to again reduce the thickness of the casting to said prescribed thickness.
Claim 3
Dependent Claim
132 words
The method as defined in claim 1, further including the steps of employing at least two rolls which are interconnected and consecutively arranged in the direction of travel of the casting and which may be forced into contact with the casting and capable of tiltably responding to irregularities at the surface of the casting, comparing the actual positions of said two rolls with prescribed positions of such rolls, and upon generation of a deviation signal owing to one such roll having been pushed outwards into a position beyond that corresponding to the prescribed thickness of the casting and in the absence of a deviation signal from the other such roll reducing the contact pressure applied by said other roll to the casting irrespective of the contact pressure exerted by said one roll.
Claim 4
Dependent Claim
45 words
The method as defined in claim 1, further including the step of applying different contact pressures to the casting when its thickness falls short of the prescribed thickness and to a dummy bar which is not as thick as a casting of the prescribed thickness.
Claim 5
Dependent Claim
153 words
The method as dEfined in claim 1, further including the steps of employing at least two rolls which are interconnected and consecutively arranged in the direction of travel of the casting and which may be forced into contact with the casting and capable of tiltably responding to irregularities at the surface of the casting, comparing the actual positions of said two rolls with the prescribed positions of such rolls, and upon generation of a deviation signal owing to one such roll having been pushed outwards into a position beyond that corresponding to the prescribed thickness of the casting and the simultaneous generation of a deviation signal from the other such roll after having moved inwards by at least the same amount into a position within that corresponding to the prescribed thickness, reducing the contact pressure applied by said other roll to the casting irrespective of the contact pressure exerted by said one roll.
References Cited (Backward Citations)
US2770021A
Cited
US3263284A
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GB1118451A
Cited
US3550676A
Cited
US3557865A
Cited
US3638713A
Cited
USPTO Annuity & Maintenance Windows
| Annuity Stage | Window Opens | Payment Deadline | Surcharge Period Until | Estimated Fee | Status |
|---|---|---|---|---|---|
| 3.5 Years (Year 4) | 1977-05-27 | 1977-11-26 | 1978-05-28 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1981-05-27 | 1981-11-26 | 1982-05-28 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1985-05-27 | 1985-11-26 | 1986-05-28 | $7700.00 | Window Closed / Lapsed |