Patent US3702071A successfully refreshed from Google Patents.
US3702071A
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Gauge control method and apparatus for metal rolling mills
Assignee: Westinghouse Electric Corp
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Filing: 1970-10-14
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Granted: 1972-11-07
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Expires: 1990-10-14
Abstract
Abstract A programmed digital computer control system provides an on-line roll force gauge control for a multiple stand tandem hot metal strip rolling mill, A gauge control program calculates the workpiece strip delivery gauge or thickness related force error from at least one stand of the rolling mill and compares this calculated delivery gauge related force error with a desired or reference delivery gauge related limit force error for the same stand to establish a delivery gauge error related force error. The gauge control program then determines in relation to the magnitude of this force error representation of the delivery gauge error for the same one stand that this force error is to be corrected by adjustment of the operation of that same one stand or is to be fed forward in the direction of the workpiece strip movement to determine the correction in a succeeding stand of the rolling mill by adjustment of the operation of the succeeding stand. This force error is effective to adjust the latter stand operation for a time interval related to the movement of the workpiece or workpiece strip portion where this force error is measured between those respective stands of the rolling mill.
Inventors
- 👤 Edward J Masar
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-10-28 14:28
CPC Classifications
B; B21; B21B; B21B37/00; B21B37/16
Claims Analysis
Total Claims: 17
Claim 1
Independent Claim
186 words
A gauge control system for a rolling mill having at least two rolling stands, with each of said stands having a controlled roll opening through which a workpiece is passed said system comprising: means for detecting the roll force of a first of said rolling stands, means for detecting the roll opening of said first rolling stand, means for determining a workpiece delivery gauge error representation in a portion of said workpiece passing through said first rolling stand in relation to said detected roll force and said detected roll opening and a predetermined roll force and a predetermined roll opening for said first rolling stand, means for determining the adjustment of the roll opening of a second of said rolling stands in accordance with said error representation to control the workpiece delivery gauge from said second rolling stand, means for determining the time interval required for said workpiece portion to be transported between said first rolling stand and said second rolling stand, and means for controlling the second rolling stand roll opening in accordance with said adjustment for a time period related to said time interval.
Claim 2
Dependent Claim
186 words
A gauge control system for a rolling mill having at least two rolling stands, with each of said stands having a controlled roll opening through which a workpiece is passed said system comprising: means for detecting the roll force of a first of said rolling stands, means for detecting the roll opening of said first rolling stand, means for determining a workpiece delivery gauge error representation in a portion of said workpiece passing through said first rolling stand in relation to said detected roll force and said detected roll opening and a predetermined roll force and a predetermined roll opening for said first rolling stand, means for determining the adjustment of the roll opening of a second of said rolling stands in accordance with said error representation to control the workpiece delivery gauge from said second rolling stand, means for determining the time interval required for said workpiece portion to be transported between said first rolling stand and said second rolling stand, and means for controlling the second rolling stand roll opening in accordance with said adjustment for a time period related to said time interval.
Claim 3
Dependent Claim
59 words
A gauge control system as set forth in claim 1 wherein said means for determining the gauge error representation and said time interval includes a programmed digital computer system, said computer system having an input coupled for response to said detecting means and having an output coupled to operate said means for controlling the second rolling stand roll opening.
Claim 4
Dependent Claim
31 words
A gauge control system as set forth in claim 2, wherein said computer system includes control program means operative to make the predetermined roll force and the predetermined roll opening determinations.
Claim 5
Dependent Claim
39 words
A gauge control system as set forth in claim 1, wherein said gauge error representation determining means operates in response to the presence of said workpiece in the roll opening of each of said first and second rolling stands.
Claim 6
Dependent Claim
27 words
A gauge control system as set forth in claim 1 wherein said gauge error representation determining means is operative substantially throughout the rolling period of said workpiece.
Claim 7
Dependent Claim
100 words
A gauge control system as set forth in claim 1 wherein the rolling mill is a tandem mill having a plurality of roll force gauge controlled stands, with each of the latter stands being provided with said roll force detecting means and said roll opening detecting means, with said gauge error representation determining means being operative to determine the gauge error representation for respective selected stands of said rolling mill, and with said roll opening adjustment determining means being operative to determine the roll opening of a succeeding stand in relation to each such gauge error representation that is determined.
Claim 8
Dependent Claim
86 words
A gauge control system as set forth in claim 1, with said means for determining a workpiece delivery gauge error representation being operative to determine a force error in accordance with the relationship: FE FX - FR - K(SD1 - SD2) where FE Is the determined gauge error representation force error, FX is the first stand detected roll force, FR is the predetermined roll force, K is the mill spring characteristic, SD1 is the first stand detected roll opening, and SD2 is the predetermined roll opening.
Claim 9
Independent Claim
195 words
A method for providing gauge control in a rolling mill having at least two rolling stands with respective screwdown controlled roll openings through which a workpiece is passed, the steps of said method comprising: detecting the roll force of one of the rolling stands, detecting the screwdown position of said one rolling stand, determining the roll force error for said one rolling stand in accordance with said detected roll force and said detected screwdown position values and predetermined roll force and predetermined screwdown position values, determining a correction to be made in the screwdown position of another of the rolling stands to provide for corrected delivery gauge from said another rolling stand, determining the time interval required for the workpiece portion for which said force error is determined to pass from said one rolling stand to said another rolling stand, with said correction determining step including predictively determining said correction in the screwdown position of said another rolling stand in accordance with the magnitude of said roll force error, and controlling the screwdown position of said another rolling stand for a time period having a predetermined relationship to said time interval for effecting said correction.
Claim 10
Independent Claim
195 words
A method for providing gauge control in a rolling mill having at least two rolling stands with respective screwdown controlled roll openings through which a workpiece is passed, the steps of said method comprising: detecting the roll force of one of the rolling stands, detecting the screwdown position of said one rolling stand, determining the roll force error for said one rolling stand in accordance with said detected roll force and said detected screwdown position values and predetermined roll force and predetermined screwdown position values, determining a correction to be made in the screwdown position of another of the rolling stands to provide for corrected delivery gauge from said another rolling stand, determining the time interval required for the workpiece portion for which said force error is determined to pass from said one rolling stand to said another rolling stand, with said correction determining step including predictively determining said correction in the screwdown position of said another rolling stand in accordance with the magnitude of said roll force error, and controlling the screwdown position of said another rolling stand for a time period having a predetermined relationship to said time interval for effecting said correction.
Claim 11
Dependent Claim
71 words
A method for providing gauge control in a rolling mill as set forth in claim 8, wherein the roll force error determining step includes the operation of a digital computer system including a control program operative to sense the detected roll force and detected screwdown position values and to establish the predetermined roll force and predetermined screwdown position values and to calculate the roll force error for said one rolling stand.
Claim 12
Dependent Claim
47 words
A method for providing gauge control in a rolling mill as set forth in claim 9, wherein said correction determining step includes the operation of said digital computer system including said control program to predictively determine said correction in the screwdown position of said another rolling stand.
Claim 13
Independent Claim
116 words
A method for providing gauge control in a rolling mill having at least one rolling stand with a controlled roll opening through which a workpiece is transported the steps of said method comprising: detecting a representation of the gauge error in a workpiece portion located at least a predetermined distance ahead of one rolling stand of said rolling mill, determining the time interval required for said workpiece portion to be transported said predetermined distance, providing a gauge error correction in accordance with the magnitude of said detected gauge error representation, and controlling the roll opening of said one rolling stand in accordance with said gauge error correction for a time period determined by said time interval.
Claim 14
Independent Claim
116 words
A method for providing gauge control in a rolling mill having at least one rolling stand with a controlled roll opening through which a workpiece is transported the steps of said method comprising: detecting a representation of the gauge error in a workpiece portion located at least a predetermined distance ahead of one rolling stand of said rolling mill, determining the time interval required for said workpiece portion to be transported said predetermined distance, providing a gauge error correction in accordance with the magnitude of said detected gauge error representation, and controlling the roll opening of said one rolling stand in accordance with said gauge error correction for a time period determined by said time interval.
Claim 15
Dependent Claim
95 words
A method for providing gauge control in a rolling mill as set forth in claim 8, with said step of determining the roll force error being in accordance with the relationship: FE FX - FR - K(SD1 - SD2) where FE is the determined roll force error, FX is the detected roll force of said one rolling stand, FR is the predetermined roll force value, K is the mill spring characteristic of said one rolling stand, SD1 is the detected screwdown position of said one rolling stand, and SD2 is the predetermined screwdown position value.
Claim 16
Dependent Claim
58 words
A gauge control system as set forth in claim 1, wherein: said means for determining a workpiece delivery gauge error representation includes a digital computer having a gauge control program which is run through for at least each of said two rolling stands to determine said workpiece delivery gauge error representation for each of said two rolling stands.
Claim 17
Dependent Claim
67 words
A gauge control system as set forth in claim 13, wherein: said gauge control program determines an adjustment of the roll opening of said second rolling stand in accordance with the delivery gauge error representation for the second rolling stand and determines an additional adjustment of the roll opening of said second rolling stand in accordance with the delivery gauge error representation for the first rolling 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) | 1975-11-07 | 1976-05-08 | 1976-11-07 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1979-11-07 | 1980-05-08 | 1980-11-07 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1983-11-07 | 1984-05-08 | 1984-11-07 | $7700.00 | Window Closed / Lapsed |