Patent US3841122A successfully refreshed from Google Patents.
US3841122A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Rolling mill gauge control method and apparatus including feedback correction
Assignee: AEG Westinghouse Industrial Automation Corp
•
Filing: 1972-11-06
•
Granted: 1974-10-15
•
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 two roll stands of a tandem rolling mill. The gauge error of the workpiece strip leaving one of said roll stands is corrected by predetermined adjustment of a selected previous other roll stand in relation to the workpiece gauge error measured at that one roll stand and to provide a feedback gauge error correction in relation to that one roll stand.
Inventors
- 👤 R Fox
- 👤 D Emberg
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-11-08 03:19
CPC Classifications
B; B21; B21B; B21B37/00; B21B37/16
Claims Analysis
Total Claims: 10
Claim 1
Independent Claim
135 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 a present first gauge error of the workpiece leaving said second roll stand, means for determining a present second gauge error of the workpiece leaving said second roll stand in accordance with a predetermined relationship including said first gauge error, means for determining a correction for application to said first roll stand during the passage of said workpiece in accordance with a predetermined relationship including said second gauge error of said workpiece, and means for controlling the roll opening of said first roll stand during the passage of said workpiece in accordance with said correction.
Claim 2
Dependent Claim
135 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 a present first gauge error of the workpiece leaving said second roll stand, means for determining a present second gauge error of the workpiece leaving said second roll stand in accordance with a predetermined relationship including said first gauge error, means for determining a correction for application to said first roll stand during the passage of said workpiece in accordance with a predetermined relationship including said second gauge error of said workpiece, and means for controlling the roll opening of said first roll stand during the passage of said workpiece in accordance with said correction.
Claim 3
Dependent Claim
97 words
The gauge control system of claim 1, with said second gauge error being determined by the relationship: FBGE(N-1) GE(N)*( S(N)/S(N-1))* RF (1) + OLDFBGE(N-1) * RF(2) where FBGE(N-1) is the second gauge error, where GE(N) is the first gauge error, where S(N) is related to the speed of the workpiece leaving said second roll stand, where S(N-1) is related to the spEed of the workpiece leaving said first roll stand, where RF(1) is a first predetermined response factor, where OLDFBGE(N-1) is the integral of the second gauge error, and where RF(2) is a second predetermined response factor.
Claim 4
Dependent Claim
32 words
The gauge control system of claim 1, including means for determining a third gauge error of the workpiece leaving said first roll stand, with said predetermined relationship including said third gauge error.
Claim 5
Dependent Claim
68 words
The gauge control system of claim 3, with said predetermined relationship being as follows: Delta SD(N-1) (GE(N-1)+ FBGE(N-1)) *( K(N- 1)/P(N-1)+ 1) where Delta SD(N-1) is said correction, where GE(N-1) is said third gauge error, where FBGE(N-1) is said second gauge error, 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
Independent Claim
151 words
A method of controlling the workpiece gauge leaving 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, the steps of said method comprising: determining a first gauge error of the workpiece leaving said second roll stand in relation to the roll force and the roll opening setting of the second roll stand, determining a second gauge error of the workpiece leaving said second roll stand in relation to said first gauge error, the speed of the second roll stand and the speed of the first roll stand, determining a correction for application to said first roll stand during the passage of said workpiece in accordance with a predetermined relationship including said second gauge error of said workpiece, and controlling the operation of said first roll stand in accordance with said correction.
Claim 7
Independent Claim
151 words
A method of controlling the workpiece gauge leaving 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, the steps of said method comprising: determining a first gauge error of the workpiece leaving said second roll stand in relation to the roll force and the roll opening setting of the second roll stand, determining a second gauge error of the workpiece leaving said second roll stand in relation to said first gauge error, the speed of the second roll stand and the speed of the first roll stand, determining a correction for application to said first roll stand during the passage of said workpiece in accordance with a predetermined relationship including said second gauge error of said workpiece, and controlling the operation of said first roll stand in accordance with said correction.
Claim 8
Dependent Claim
56 words
The method of claim 5, with said correction being determined by the relationship: SD(N-1) FBGE(N-1) * (K(N-1)/P(N-1)+1) where SD(N-1) is said correction, where FBGE(N-1) is said second gauge error, 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 9
Dependent Claim
38 words
The method of claim 5, including the step of determining a third gauge error of the workpiece leaving said first roll stand in relation to the roll force and the roll opening setting of the first roll stand.
Claim 10
Dependent Claim
64 words
The method of claim 7, with said correction being determined as follows: Delta SD(N-1) (GE(N-1)+ FBGE(N-1)) *( K(N-1)/P(N-1)+1) where Delta SD(N-1) is said correction, where GE(N-1) is said third gauge error where FBGE(N-1) is said second gauge error, 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.
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) | 1977-10-14 | 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 |