Patent US3694636A successfully refreshed from Google Patents.
US3694636A
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US
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Digital computer process control with operational learning procedure
Assignee: Westinghouse Electric Corp
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Filing: 1970-03-20
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Granted: 1972-09-26
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Expires: 1990-03-20
Abstract
Abstract A programmed digital computer process control is disclosed including an operational learning procedure in relation to the operation of a dynamic process such as at least one rolling mill stand and classification by operational categories, such as by workpiece grade categories and workpiece thickness categories, with particular usefulness for a reversing mill having a variable number of workpiece passes. A least squares regression fitting of collected data is performed on line relative to process information data collected for establishing the constants in a predetermined process operational mathematical expression, which constants are modified and stored in relation to the above predetermined categories of past process operation for the prediction of future process operation. As a result of the here provided learning procedure the past operational standard error deviation is determined and can be used to test new data to determine that it does not exceed the normal and permissive scatter for some particular grade and workpiece thickness classification.
Inventors
- 👤 Andrew W Smith Jr
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-11-05 12:35
CPC Classifications
B; B21; B21B; B21B37/00; B21B37/16; G; G06; G06N; G06N20/00
Claims Analysis
Total Claims: 20
Claim 1
Independent Claim
149 words
The method of controlling a rolling mill operation relative to at least one present workpiece and performed by a digital computer having a program stored in memory which enables the computer to perform the steps of establishing a predicted operation for said rolling mill in accordance with a predetermined process operation relationship for said rolling mill, establishing a correction factor for the operation of said rolling mill using information learned from the operation of said rolling mill with at least one previous workpiece similar in height and grade to said present workpiece, which correction factor is established by a predetermined correlation relationship including at least one learned parameter within said correlation relationship, establishing a repredicted operation for said rolling mill in accordance with said predicted operation and said correlation factor, and passing said present workpiece through said mill stand in accordance with said repredicted operation of said rolling mill.
Claim 2
Independent Claim
149 words
The method of controlling a rolling mill operation relative to at least one present workpiece and performed by a digital computer having a program stored in memory which enables the computer to perform the steps of establishing a predicted operation for said rolling mill in accordance with a predetermined process operation relationship for said rolling mill, establishing a correction factor for the operation of said rolling mill using information learned from the operation of said rolling mill with at least one previous workpiece similar in height and grade to said present workpiece, which correction factor is established by a predetermined correlation relationship including at least one learned parameter within said correlation relationship, establishing a repredicted operation for said rolling mill in accordance with said predicted operation and said correlation factor, and passing said present workpiece through said mill stand in accordance with said repredicted operation of said rolling mill.
Claim 3
Dependent Claim
50 words
The method of claim 1, with said predetermined correlation relationship being a mathematical equation of the form a0 + a1 (X), where a0 and a1 are learned parameters and X relates to the operation of said rolling mill to effect a desired reduction in the thickness of said present workpiece.
Claim 4
Dependent Claim
37 words
The method of claim 1, with a different correction factor being established for each predetermined classification relative to at least one of a height characteristic and a grade characteristic of the workpieces passed through said rolling mill.
Claim 5
Dependent Claim
66 words
The method of claim 1, with said correction factor being established by a predetermined weighting consideration of information learned from the operation of said rolling mill with at least said one previous workpiece and information learned from the operation of said rolling mill with said present workpiece, with said previous workpiece being similar to said present workpiece in regard to a predetermined classification of said workpieces.
Claim 6
Dependent Claim
54 words
The method of claim 1, with a different correction factor being established in relation to each of similar predetermined classifications of the workpieces passed through said rolling mill and in relation to a learning procedure weighting factor in regard to the number of previous good passes of similar classification workpieces through said rolling mill.
Claim 7
Dependent Claim
194 words
In apparaTus including a digital computer having a program stored in memory for controlling the thickness of a present workpiece having a predetermined classification and passed through a rolling mill stand after at least one previous workpiece having a similar classification has already passed through said rolling mill stand, the combination of means for providing a predicted operation of said mill stand in accordance with a predetermined process operation relationship for said mill stand and the classification of said present workpiece, said means additionally providing an operational correction factor for said mill stand in accordance with a predetermined correlation of information learned from passing through said mill stand at least one previous workpiece having a similar classification, said correlation of information including at least one learned parameter that is classified in accordance with at least one of the grade and the height classification of said present workpiece, and said means further providing a repredicted operation of said mill stand in relation to said predicted operation and said operational correction factor, and means for determining the passage of said present workpiece through said mill stand in accordance with said repredicted operation of said mill stand.
Claim 8
Dependent Claim
194 words
In apparaTus including a digital computer having a program stored in memory for controlling the thickness of a present workpiece having a predetermined classification and passed through a rolling mill stand after at least one previous workpiece having a similar classification has already passed through said rolling mill stand, the combination of means for providing a predicted operation of said mill stand in accordance with a predetermined process operation relationship for said mill stand and the classification of said present workpiece, said means additionally providing an operational correction factor for said mill stand in accordance with a predetermined correlation of information learned from passing through said mill stand at least one previous workpiece having a similar classification, said correlation of information including at least one learned parameter that is classified in accordance with at least one of the grade and the height classification of said present workpiece, and said means further providing a repredicted operation of said mill stand in relation to said predicted operation and said operational correction factor, and means for determining the passage of said present workpiece through said mill stand in accordance with said repredicted operation of said mill stand.
Claim 9
Dependent Claim
25 words
The apparatus of claim 6, with said predetermined correlation including information learned from at least one pass through said mill stand of said present workpiece.
Claim 10
Dependent Claim
66 words
The apparatus of claim 6, with said operational correction factor being updated after the completed operation of said rolling mill with said present workpiece, said updating being in relation to a predetermined weighting factor times the information learned from passing through said mill stand at least one previous and similar workpiece in addition to the information learned from passing said present workpiece through said mill stand.
Claim 11
Dependent Claim
253 words
In a control system including a digital computer having a program stored in memory and being operative with a rolling mill stand for reducing the thickness of at least a present workpiece of a plurality of workpieces, the combination of means for predicting the operation of said mill stand to provide a desired reduction in said present workpiece by said mill stand in accordance with a first predetermined functional relationship for said mill stand and the predetermined classification of said present workpiece, said means additionally determining respective corrections for the operation of said mill stand corresponding to predetermined classifications of said workpieces, with each said correction being a predetermined correlation relative to a plurality of reductions made by said mill stand on previous workpieces having a similar classification and with this determination including a comparison between a previous predicted operation of said mill stand for at least one workpiece having said predetermined classification and the corresponding actual operation of said mill stand for at least the latter said workpiece, said means further determining if the classification of said present workpiece is different than the classification of the last workpiece reduced by said mill stand, and said means updating said correction corresponding to the classification of said last workpiece when said present workpiece is different than said last workpiece, and means for determining the passage of said present workpiece through said mill stand in accordance with said predicted operation of said mill stand and said correction corresponding to the classification of said present workpiece.
Claim 12
Dependent Claim
253 words
In a control system including a digital computer having a program stored in memory and being operative with a rolling mill stand for reducing the thickness of at least a present workpiece of a plurality of workpieces, the combination of means for predicting the operation of said mill stand to provide a desired reduction in said present workpiece by said mill stand in accordance with a first predetermined functional relationship for said mill stand and the predetermined classification of said present workpiece, said means additionally determining respective corrections for the operation of said mill stand corresponding to predetermined classifications of said workpieces, with each said correction being a predetermined correlation relative to a plurality of reductions made by said mill stand on previous workpieces having a similar classification and with this determination including a comparison between a previous predicted operation of said mill stand for at least one workpiece having said predetermined classification and the corresponding actual operation of said mill stand for at least the latter said workpiece, said means further determining if the classification of said present workpiece is different than the classification of the last workpiece reduced by said mill stand, and said means updating said correction corresponding to the classification of said last workpiece when said present workpiece is different than said last workpiece, and means for determining the passage of said present workpiece through said mill stand in accordance with said predicted operation of said mill stand and said correction corresponding to the classification of said present workpiece.
Claim 13
Dependent Claim
56 words
The control system of claim 9, with the correction corresponding to the classification of said present workpiece being updated by a predetermined combination of said correction determined prior to said present workpiece being reduced in thickness by said mill stand and said correction determined after said present workpiece is reduced in thickness by said mill stand.
Claim 14
Independent Claim
117 words
The method of contRolling the operation of a rolling mill with a present workpiece and performed by a digital computer having a program stored in memory which enables the computer to perform the steps of establishing an accumulated average first correction factor in accordance with operational data collected for the rolling of at least one previous workpiece, establishing an average second correction factor in accordance with operational data collected for the previous rolling of said present workpiece, and establishing a next operation correction factor for said rolling mill with said present workpiece in accordance with said first correction factor and said second correction factor for determining the operation of said rolling mill relative to said present workpiece.
Claim 15
Independent Claim
117 words
The method of contRolling the operation of a rolling mill with a present workpiece and performed by a digital computer having a program stored in memory which enables the computer to perform the steps of establishing an accumulated average first correction factor in accordance with operational data collected for the rolling of at least one previous workpiece, establishing an average second correction factor in accordance with operational data collected for the previous rolling of said present workpiece, and establishing a next operation correction factor for said rolling mill with said present workpiece in accordance with said first correction factor and said second correction factor for determining the operation of said rolling mill relative to said present workpiece.
Claim 16
Dependent Claim
30 words
The method of claim 11, with said first correction factor being established in relation to the rolling of at least one previous workpiece which is similar to said present workpiece.
Claim 17
Dependent Claim
31 words
The method of claim 11, with said first correction factor and said second correction factor being established in relation to the making of similar reductions in the thickness of similar workpieces.
Claim 18
Independent Claim
146 words
The method of controlling the operation of a rolling mill relative to a present workpiece by a digital computer having a program stored in memory to perform the steps of establishing a predicted value for at least one parameter determining the operation of said rolling mill with said present workpiece and in accordance with a predetermined understanding about said rolling mill operation, establishing a first deviation for the operation of said rolling mill with at least one similar and previous workpiece and relative to the actual value of at least said one parameter relative to a predicted value of at least said one parameter, establishing a second deviation for the operation of said rolling mill with said present workpiece relative to the actual value of at least said one parameter, comparing said first deviation with said second deviation to determine the operation of said rolling mill.
Claim 19
Independent Claim
146 words
The method of controlling the operation of a rolling mill relative to a present workpiece by a digital computer having a program stored in memory to perform the steps of establishing a predicted value for at least one parameter determining the operation of said rolling mill with said present workpiece and in accordance with a predetermined understanding about said rolling mill operation, establishing a first deviation for the operation of said rolling mill with at least one similar and previous workpiece and relative to the actual value of at least said one parameter relative to a predicted value of at least said one parameter, establishing a second deviation for the operation of said rolling mill with said present workpiece relative to the actual value of at least said one parameter, comparing said first deviation with said second deviation to determine the operation of said rolling mill.
Claim 20
Dependent Claim
85 words
The method of claim 14, with said one parameter predicted value being the roll force for a given stand of said rolling mill and being established in accordance with said predetermined understanding about said rolling mill operation, and with said first deviation being established in relation to the actual value of said roll force when said previous workpiece was passed through said rolling mill stand and the predicted value of said roll force prior to said previous workpiece being passed through said rolling mill stand.
References Cited (Backward Citations)
US3332263A
Cited
USPTO Annuity & Maintenance Windows
| Annuity Stage | Window Opens | Payment Deadline | Surcharge Period Until | Estimated Fee | Status |
|---|---|---|---|---|---|
| 3.5 Years (Year 4) | 1975-09-26 | 1976-03-27 | 1976-09-26 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1979-09-26 | 1980-03-27 | 1980-09-26 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1983-09-26 | 1984-03-27 | 1984-09-26 | $7700.00 | Window Closed / Lapsed |