US3841123A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Rolling mill gauge control method and apparatus including entry gauge correction
Assignee: AEG Westinghouse Industrial Automation Corp
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Filing: 1972-11-06
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Granted: 1974-10-15
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Expires: 1992-11-06
Abstract
Abstract An automatic gauge control is disclosed to provide on line control of the delivery gauge or thickness from at least one roll stand of a tandem rolling mill, for which one roll stand it is not desired to adjust the roll opening for the purpose of controlling the delivery gauge of workpiece strip leaving that roll stand. The gauge error of the workpiece strip leaving that one roll stand is corrected by predetermined adjustment of a selected previous roll stand in relation to the work-piece gauge error measured at that one roll stand and to provide a desired entry gauge correction in relation to that one roll stand.
Inventors
- 👤 R Fox
- 👤 A Smith
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-11-02 06:40
CPC Classifications
B; B21; B21B; B21B37/00; B21B37/16
Claims Analysis
Total Claims: 12
Claim 1
Independent Claim
152 words
A gauge control system for a rolling mill having at least a first roll stand followed by a second roll stand operative to reduce the gauge of a workpiece passed through said rolling mill, said system comprising: means for determining the delivery gauge error of said workpiece leaving said second roll stand in accordance with a first predetermined relationship including the change in the screwdown position of said second roll stand and the change in the roll force of said second roll stand, means for determining the required adjustment of said first roll stand for correcting said delivery gauge error in accordance with a second predetermined relationship including the mill spring modulus of said second roll stand and the workpiece plasticity in relation to said second roll stand, and means for controlling the roll opening of said first roll stand during the passage of said workpiece in accordance with said required adjustment.
Claim 2
Dependent Claim
152 words
A gauge control system for a rolling mill having at least a first roll stand followed by a second roll stand operative to reduce the gauge of a workpiece passed through said rolling mill, said system comprising: means for determining the delivery gauge error of said workpiece leaving said second roll stand in accordance with a first predetermined relationship including the change in the screwdown position of said second roll stand and the change in the roll force of said second roll stand, means for determining the required adjustment of said first roll stand for correcting said delivery gauge error in accordance with a second predetermined relationship including the mill spring modulus of said second roll stand and the workpiece plasticity in relation to said second roll stand, and means for controlling the roll opening of said first roll stand during the passage of said workpiece in accordance with said required adjustment.
Claim 3
Dependent Claim
48 words
The gauge control system of claim 1, with said means for determining said required adjustment being operative in accordance with the mill spring modulus of each of said first and second roll stands and the workpiece plasticity in relation to each of said first and second roll stands.
Claim 4
Dependent Claim
82 words
The gauge control system of claim 1, with said first predetermined relationship being in accordance with the following equation: GE(N) (SD(N) - LOSD(N)) + (F(N) - LOF(N))*K(N) where GE(N) is the delivery gauge error leaving said second roll stand, where (SD(N) - LOSD(N)) is the change in screwdown position of said second roll stand, where (F(N) - LOF(N)) is the change in roll force of said second roll stand, and where K(N) is the mill spring modulus of said second roll stand.
Claim 5
Dependent Claim
101 words
The gauge control system of claim 1, with said second predetermined relationship being in accordance with the following equation: Delta SD(N-1) GE(N)*(P(N)/K(N) + 1)*(K(N-1)/P(N-1) + 1) where Delta SD(N-1) is the required adjustment of said first roll stand, where GE(N) is the delivery gauge error leaving said second roll stand, where P(N) is the workpiece plasticity in relation to said second roll stand, where K(N) is the mill spring modulus of said second roll stand, where K(N-1) is the mill spring modulus of said first roll stand, and where P(N-1) is the workpiece plasticity in relation to said first roll stand.
Claim 6
Dependent Claim
39 words
The gauge control system of claim 1, with said second roll stand being in a condition of limited operation for controlling said gauge error such that it is desired for said first roll stand to correct said gauge error.
Claim 7
Dependent Claim
153 words
A gauge control system for a rolling mill having at least a first roll stand followed by a second roll stand and being operative to reduce the gauge of a workpiece passed through said first and second roll stands, sAid system comprising: means for determining the second stand delivery gauge error of said workpiece leaving said second roll stand in relation to the roll force of that second roll stand and with said second roll stand being in a condition of roll opening position adjustment limit, means operative in accordance with a predetermined relationship including said second stand delivery gauge error for determining the required adjustment of said first roll stand to correct said second stand delivery gauge error by the passage of said workpiece through said first roll stand, and means for providing said required adjustment of said first roll stand during the passage of said workpiece through said first roll stand.
Claim 8
Dependent Claim
153 words
A gauge control system for a rolling mill having at least a first roll stand followed by a second roll stand and being operative to reduce the gauge of a workpiece passed through said first and second roll stands, sAid system comprising: means for determining the second stand delivery gauge error of said workpiece leaving said second roll stand in relation to the roll force of that second roll stand and with said second roll stand being in a condition of roll opening position adjustment limit, means operative in accordance with a predetermined relationship including said second stand delivery gauge error for determining the required adjustment of said first roll stand to correct said second stand delivery gauge error by the passage of said workpiece through said first roll stand, and means for providing said required adjustment of said first roll stand during the passage of said workpiece through said first roll stand.
Claim 9
Dependent Claim
90 words
The gauge control system of claim 6, with said determination of said required adjustment Delta SD(N-1) being in accordance with the following relationship: Delta SD(N-1) GE(N)*(P(N)/K(N) + 1)*(K(N-1)/P(N-1) + 1) where GE(N) is the second stand delivery gauge error, where P(N) is the workpiece plasticity in relation to the second roll stand, where K(N) is the mill spring modulus of the second roll stand, where K(N-1) is the mill spring modulus of the first roll stand, and where P(N-1) is the workpiece plasticity in relation to the first roll stand.
Claim 10
Independent Claim
127 words
A method of controlling the gauge of a workpiece passed through a rolling mill having at least a previous roll stand followed by a later roll stand for reducing said gauge, the steps of said method comprising: determining the delivery gauge error of said workpiece leaving said later roll stand during the passage of said workpiece through that later roll stand, determining the required correction of the operation of said previous roll stand for correcting said delivery gauge error during the passage of said workpiece through said previous roll stand in accordance with a predetermined relationship including the mill spring modulus and the workpiece plasticity in relation to said later roll stand, and adjusting the operation of said previous roll stand in accordance with said required correction.
Claim 11
Independent Claim
127 words
A method of controlling the gauge of a workpiece passed through a rolling mill having at least a previous roll stand followed by a later roll stand for reducing said gauge, the steps of said method comprising: determining the delivery gauge error of said workpiece leaving said later roll stand during the passage of said workpiece through that later roll stand, determining the required correction of the operation of said previous roll stand for correcting said delivery gauge error during the passage of said workpiece through said previous roll stand in accordance with a predetermined relationship including the mill spring modulus and the workpiece plasticity in relation to said later roll stand, and adjusting the operation of said previous roll stand in accordance with said required correction.
Claim 12
Dependent Claim
85 words
The method of claim 8, with said predetermined relationship being as follows: Delta SD(N-1) GE(N)*(P(N)/K(N) + 1)*(K(N-1)/P(N-1) + 1) where Delta SD(N-1) is the required correction of the operation of the previous roll stand, where P(N) is the workpiece plasticity in relation to said later roll stand, where K(N) is the mill spring modulus of said later roll stand, where K(N-1) is the mill spring modulus of said previous roll stand, and where P(N-1) is the workpiece plasticity in relation to said previous roll stand.
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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) | 1977-10-14 | 1978-04-15 | 1978-10-15 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1981-10-14 | 1982-04-15 | 1982-10-15 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1985-10-14 | 1986-04-15 | 1986-10-15 | $7700.00 | Window Closed / Lapsed |