US3709008A
Expired / Lapsed
US
⏱️ 0.0 years remaining
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: 1973-01-09
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Expires: 1990-10-14
Abstract
Abstract A programmed 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 error from at least one stand of the rolling mill and from this gauge error determines a required roll opening correction to remove this gauge error. The gauge control program then determines in relation to the magnitude of the delivery gauge error and related roll opening correction for the same one stand that this delivery gauge error is to be corrected by adjustment of the roll opening of that same one stand or is to be fed forward in the direction of the workpiece strip movement for correction in a succeeding stand of the rolling mill by adjustment of the roll opening of the succeeding stand. The roll opening correction is effective to adjust the latter stand operation for a time interval related to the movement of the workpiece strip increment from the stand where the gauge error is measured to the following correction stand of the rolling mill, assuming the latter stands are adjacent stands of the rolling mill.
Inventors
- 👤 A Smith
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-11-02 08:40
CPC Classifications
B; B21; B21B; B21B37/00; B21B37/16
Claims Analysis
Total Claims: 33
Claim 1
Independent Claim
164 words
A gauge control system for a rolling mill having at least one rolling stand, with said one rolling stand having a controlled roll opening through which a moving workpiece is transported, said system comprising means for determining a gauge error in a portion of said workpiece at a predetermined distance prior to said one rolling stand, means for determining a correction of the roll opening of said one rolling stand in relation to said gauge error to control the workpiece delivery gauge from said one rolling stand, means for controlling the roll opening of said rolling stand in accordance with said correction, means for determining the length of time said correction is applied to control said roll opening, with said means for controlling the roll opening of said rolling stand being operative to terminate said correction When said workpiece portion arrives at said rolling stand and being operative to control said roll opening for a time interval substantially equal to said length of time.
Claim 2
Dependent Claim
164 words
A gauge control system for a rolling mill having at least one rolling stand, with said one rolling stand having a controlled roll opening through which a moving workpiece is transported, said system comprising means for determining a gauge error in a portion of said workpiece at a predetermined distance prior to said one rolling stand, means for determining a correction of the roll opening of said one rolling stand in relation to said gauge error to control the workpiece delivery gauge from said one rolling stand, means for controlling the roll opening of said rolling stand in accordance with said correction, means for determining the length of time said correction is applied to control said roll opening, with said means for controlling the roll opening of said rolling stand being operative to terminate said correction When said workpiece portion arrives at said rolling stand and being operative to control said roll opening for a time interval substantially equal to said length of time.
Claim 3
Dependent Claim
58 words
A gauge control system as set forth in claim 1, including a digital computer system, said computer system having an output coupled to said means for controlling the roll opening of said rolling stand, and said length of time determining means including a stored control program operative with said digital computer system to determine said length of time.
Claim 4
Dependent Claim
25 words
A gauge control system as set forth in claim 2, wherein said computer system includes a stored control program operative to determine said gauge error.
Claim 5
Dependent Claim
26 words
A gauge control system as set forth in claim 1 wherein said gauge error determining means is operative substantially throughout the rolling period of said workpiece.
Claim 6
Dependent Claim
152 words
A gauge control system for a rolling mill having at least two rolling stands, with the second of said stands having a controlled roll opening through which a moving workpiece is transported, said system comprising means for determining a gauge error at a first of said rolling stands, means for determining a correction of the roll opening of said second of said rolling stands to control the workpiece delivery gauge from said second rolling stand, means for controlling the second rolling stand roll opening to apply said correction, with said correction determining means including means for establishing an ON time and an OFF time for applying said correction to the roll opening of said second rolling stand, in accordance with the movement of said workpiece between said first and second rolling stand, such that the application of said correction is terminated when said determined gauge error arrives at the second rolling stand.
Claim 7
Dependent Claim
152 words
A gauge control system for a rolling mill having at least two rolling stands, with the second of said stands having a controlled roll opening through which a moving workpiece is transported, said system comprising means for determining a gauge error at a first of said rolling stands, means for determining a correction of the roll opening of said second of said rolling stands to control the workpiece delivery gauge from said second rolling stand, means for controlling the second rolling stand roll opening to apply said correction, with said correction determining means including means for establishing an ON time and an OFF time for applying said correction to the roll opening of said second rolling stand, in accordance with the movement of said workpiece between said first and second rolling stand, such that the application of said correction is terminated when said determined gauge error arrives at the second rolling stand.
Claim 8
Dependent Claim
75 words
A gauge control system as set forth in claim 5 wherein said means for determining the ON time and the OFF time of said correction includes a programmed digital computer system, said computer system having a program for determining the OFF time in accordance with the transport time delay of said workpiece movement between the first and second rolling stands and for determining the ON time as a predetermined time period before said OFF time.
Claim 9
Dependent Claim
41 words
A gauge control system as set forth in claim 6, wherein said means for determining the ON time and the OFF time is operative to determine said OFF time and then determine said ON time in relation to said OFF time.
Claim 10
Dependent Claim
76 words
A gauge control system for a rolling mill as set forth in claim 5, said system including means for detecting the roll force of said first rolling stand, means for detecting the roll opening of said first rolling stand, with said means for determining a gauge error being operative 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.
Claim 11
Dependent Claim
49 words
A gauge control system as set forth in claim 5 with said means for establishing an ON time and an OFF time being responsive to the spacing between said first rolling stand and the second rolling stand and being responsive to the operating speed of the first rolling stand.
Claim 12
Dependent Claim
167 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 determining a screwdown correction relative to a workpiece delivery gauge error in a portion of said workpiece passing through a first of said rolling stands, means for determining a correction of the roll opening of a second of said rolling stands in response to said screwdown correction to provide a desired workpiece delivery gauge from said second rolling stand, means for determining the time interval required for said workpiece portion to be transported for a predetermined distance, and means for controllinG the correction of the second rolling stand roll opening having an ON time for said correction and an OFF time for said correction in accordance with said time interval and such that said OFF time is scheduled in relation to the arrival of said workpiece portion at said second rolling stand.
Claim 13
Dependent Claim
167 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 determining a screwdown correction relative to a workpiece delivery gauge error in a portion of said workpiece passing through a first of said rolling stands, means for determining a correction of the roll opening of a second of said rolling stands in response to said screwdown correction to provide a desired workpiece delivery gauge from said second rolling stand, means for determining the time interval required for said workpiece portion to be transported for a predetermined distance, and means for controllinG the correction of the second rolling stand roll opening having an ON time for said correction and an OFF time for said correction in accordance with said time interval and such that said OFF time is scheduled in relation to the arrival of said workpiece portion at said second rolling stand.
Claim 14
Dependent Claim
47 words
A gauge control system as set forth in claim 10 wherein said means for determining the screwdown correction and said time interval includes a programmed digital computer system, said computer system being coupled to said means for controlling said correction of the second rolling stand roll opening.
Claim 15
Dependent Claim
40 words
A gauge control system as set forth in claim 10, wherein said screwdown correction determining means operates in response to the presence of said workpiece in the roll opening of at least one of said first and second rolling stands.
Claim 16
Dependent Claim
72 words
A gauge control system as set forth in claim 10, including means for detecting the roll force of said first of said rolling stands, means for detecting the roll opening of said first rolling stand, with said means for determining said screwdown correction being operative 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.
Claim 17
Dependent Claim
95 words
A gauge control system as set forth in claim 13 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 means for detecting the stand roll force and the stand roll opening, with said screwdown correction determining means being operative to determine a screwdown correction for respective selected stands of said rolling mill, and with said correction controlling means being to correct the roll opening of a succeeding stand in relation to each such screwdown correction that is determined.
Claim 18
Dependent Claim
100 words
A gauge control system as set forth in claim 10, including means for detecting the roll force FN of said first of said rolling stands. means for detecting the roll opening SDN of said first rolling stand, with said means for determining said screwdown correction SDREFN being operative in relation to said detected roll force FN and said detected roll opening SDN and a predetermined roll force FLON and a predetermined roll opening SDLON for said first rolling stand in accordance with the relationship where KN is a predetermined mill spring characteristic and PN is a predetermined workpiece plasticity characteristic.
Claim 19
Dependent Claim
45 words
A gauge control system as set forth in claim 10, including means for determining said OFF time in relation to said workpiece portion passing through said second rolling stand and for determining said ON time in relation to said OFF time and said time interval.
Claim 20
Dependent Claim
67 words
A method of controlling workpiece gauge for a rolling mill as set forth in claim 10, wherein the length of time determining step includes the operation of a programmed digital computer system to sense the movement of the workpiece portion for said predetermined distance and to determine said length of time in relation to the travel time delay required for the workpiece portion to travel said distance.
Claim 21
Independent Claim
181 words
A method of controlling workpiece gauge for a rolling mill having at least one rolling stand, with said one rolling stand having a controlled roll opening through which a moving workpiece is passed, the steps of said method comprising determining a gauge error in a portion of said workpiece at a predetermined distance ahead of said one rolling stand in accordance with the movement direction of said workpiece through said one rolling stand, determining a correction to control the roll opening of at least said one rolling stand to provide for correct delivery gauge from at least said one rolling stand, determining the Length of time said correction is applied to control the roll opening of at least said one rolling stand in relation to the movement of the workpiece portion for said predetermined distance, and controlling the roll opening of at least said one rolling stand for said length of time in accordance with said correction and such that the application of said correction is completed in relation to the arrival of said workpiece portion at said one rolling stand.
Claim 22
Independent Claim
181 words
A method of controlling workpiece gauge for a rolling mill having at least one rolling stand, with said one rolling stand having a controlled roll opening through which a moving workpiece is passed, the steps of said method comprising determining a gauge error in a portion of said workpiece at a predetermined distance ahead of said one rolling stand in accordance with the movement direction of said workpiece through said one rolling stand, determining a correction to control the roll opening of at least said one rolling stand to provide for correct delivery gauge from at least said one rolling stand, determining the Length of time said correction is applied to control the roll opening of at least said one rolling stand in relation to the movement of the workpiece portion for said predetermined distance, and controlling the roll opening of at least said one rolling stand for said length of time in accordance with said correction and such that the application of said correction is completed in relation to the arrival of said workpiece portion at said one rolling stand.
Claim 23
Dependent Claim
81 words
A method for providing gauge control in a rolling mill as set forth in claim 18 wherein said correction determining step includes the operation of a programmed digital computer system to determine said correction in the roll opening of said one rolling stand in accordance with the relationship where DELS is the determined correction, GE is the determined gauge error, KN is predetermined mill spring characteristic for said one rolling stand, and PN is the predetermined plasticity characteristic of said workpiece.
Claim 24
Independent Claim
199 words
A method of controlling the workpiece gauge for 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 workpiece gauge error for said one rolling stand in accordance with detected roll force and 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 correct delivery gauge from said another rolling stand, determining the time interval required for the workpiece portion for which gauge 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 relation to the magnitude of said gauge error, and controlling the screwdown position of said another rolling stand in a predetermined relationship to said time interval for effecting said correction before said workpiece portion arrives at said another rolling stand.
Claim 25
Independent Claim
199 words
A method of controlling the workpiece gauge for 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 workpiece gauge error for said one rolling stand in accordance with detected roll force and 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 correct delivery gauge from said another rolling stand, determining the time interval required for the workpiece portion for which gauge 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 relation to the magnitude of said gauge error, and controlling the screwdown position of said another rolling stand in a predetermined relationship to said time interval for effecting said correction before said workpiece portion arrives at said another rolling stand.
Claim 26
Dependent Claim
65 words
A method of controlling the workpiece gauge for a rolling mill as set forth in claim 20 wherein the gauge error determining step includes the operation of a programmed digital computer system to sense the detected roll force and detected screwdown position values and to establish the predetermined roll force and predetermined screwdown values and to calculate the gauge error for said one rolling stand.
Claim 27
Dependent Claim
44 words
A method of controlling the workpiece gauge for a rolling mill as set forth in claim 21 wherein said correction determining step includes the operation of said programmed digital computer system to determine said correction in the screwdown position of said another rolling stand.
Claim 28
Independent Claim
135 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 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 and such that said roll opening control is completed before said workpiece portion is transported to said one rolling stand.
Claim 29
Independent Claim
135 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 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 and such that said roll opening control is completed before said workpiece portion is transported to said one rolling stand.
Claim 30
Independent Claim
194 words
A method of controlling gauge in a rollIng mill having at least two rolling stands with respective controlled roll openings through which a workpiece is passed, the steps of said method comprising detecting the roll force FN of a first of the rolling stands, detecting the roll opening SDN of said first rolling stand, determining the gauge error GE for said first rolling stand in accordance with detected roll force FN and detected roll opening SDN values and predetermined roll force FLON and predetermined roll opening SDLON values, determining a correction DELS to be made in the roll opening of at least a second rolling stand to provide for corrected delivery gauge from at least said second rolling stand in accordance with a predetermined relationship where KN and PN are predetermined rolling stand operational characteristics and controlling the roll opening of said second rolling stand to effect said correction for a time interval related to the workpiece transport time between said second rolling stand and the rolling stand prior to said second rolling stand and such that said roll opening control is completed before said workpiece gauge error arrives at said second rolling stand.
Claim 31
Independent Claim
194 words
A method of controlling gauge in a rollIng mill having at least two rolling stands with respective controlled roll openings through which a workpiece is passed, the steps of said method comprising detecting the roll force FN of a first of the rolling stands, detecting the roll opening SDN of said first rolling stand, determining the gauge error GE for said first rolling stand in accordance with detected roll force FN and detected roll opening SDN values and predetermined roll force FLON and predetermined roll opening SDLON values, determining a correction DELS to be made in the roll opening of at least a second rolling stand to provide for corrected delivery gauge from at least said second rolling stand in accordance with a predetermined relationship where KN and PN are predetermined rolling stand operational characteristics and controlling the roll opening of said second rolling stand to effect said correction for a time interval related to the workpiece transport time between said second rolling stand and the rolling stand prior to said second rolling stand and such that said roll opening control is completed before said workpiece gauge error arrives at said second rolling stand.
Claim 32
Dependent Claim
70 words
A method for providing gauge control in a rolling mill as set forth in claim 24 wherein the gauge error determining step includes the operation of a programmed digital computer system to sense the detected roll force FN and detected roll opening SDN values and to establish the predetermined roll force FLON and predetermined roll opening SDLON values and to calculate the gauge error GE for said first rolling stand.
Claim 33
Dependent Claim
45 words
A method for providing gauge control in a rolling mill as set forth in claim 25 wherein said correction determining step includes the operation of said programmed digital computer system to predictively determine said correction DELS in the roll opening of said second 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) | 1976-01-09 | 1976-07-10 | 1977-01-09 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1980-01-09 | 1980-07-10 | 1981-01-09 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1984-01-09 | 1984-07-10 | 1985-01-09 | $7700.00 | Window Closed / Lapsed |