US3568637A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Tandem mill force feed forward adaptive system
Assignee: Westinghouse Electric Corp
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Filing: 1968-05-13
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Granted: 1971-03-09
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Expires: 1988-05-13
Abstract
Abstract A feed forward screwdown control system is provided for use in a computer-controlled rolling mill to improve mill setup for subsequent workpieces as well as for the piece being rolled. Ratio comparisons are made between the measured force and the predicted force in each stand while a piece is being rolled which together with the ratios determined from the previous rolled workpiece will provide information for causing an on-gauge product for the present workpiece.
Inventors
- 👤 Andrew W Smith Jr
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-11-01 20:18
CPC Classifications
B; B21; B21B; B21B37/00; B21B37/16
Claims Analysis
Total Claims: 22
Claim 1
Independent Claim
169 words
A gauge control system for a rolling mill having at least one roll stand with a screwdown-controlled roll opening through which a first pass of a present workpiece is transported, said system comprising: means for detecting the actual roll force at said one roll stand during said first pass; means for determining the delivery work piece gauge leaving said roll stand after said first pass; means for determining a predicted roll force for said first pass in relation to said delivery workpiece gauge; means for determining a correction factor for a second pass of said present workpiece through a roll stand in accordance with a ratio of said actual roll force to said predicted roll force; means for determining a screwdown setting in accordance with said correction factor for said second pass through a roll stand of said rolling mill; and means for controlling the screwdown movement for said second pass in accordance with said screwdown setting to effect a desired reduction in the gauge of said present workpiece.
Claim 2
Dependent Claim
169 words
A gauge control system for a rolling mill having at least one roll stand with a screwdown-controlled roll opening through which a first pass of a present workpiece is transported, said system comprising: means for detecting the actual roll force at said one roll stand during said first pass; means for determining the delivery work piece gauge leaving said roll stand after said first pass; means for determining a predicted roll force for said first pass in relation to said delivery workpiece gauge; means for determining a correction factor for a second pass of said present workpiece through a roll stand in accordance with a ratio of said actual roll force to said predicted roll force; means for determining a screwdown setting in accordance with said correction factor for said second pass through a roll stand of said rolling mill; and means for controlling the screwdown movement for said second pass in accordance with said screwdown setting to effect a desired reduction in the gauge of said present workpiece.
Claim 3
Dependent Claim
94 words
The gauge control system as set forth in claim 11, wherein said system includes: recording means for retaining the detected actual roll force at a roll stand during said first pass; means for determining the delivery workpiece gauge for each pass of the workpiece through a roll stand of said rolling mill; and means for determining if said present workpiece is different from a previous workpiece in relation to one of the alloy and the target gauge of said present workpiece for providing a unity stand correction factor when such a difference is determined.
Claim 4
Dependent Claim
28 words
The gauge control system as set forth in claim 1, wherein said gauge control system is operative during the rolling of the head end of said present workpiece.
Claim 5
Dependent Claim
109 words
The gauge control system as set forth in claim 1, including means for determining a respective stand correction factor for each of said roll stands in accordance with the equation where SCFn is the determined stand correction factor for stand n, FMn is the measured force relative to a present work piece passing through stand n and Fn is the predicted force for stand n in accordance with the actual reduction in the gauge of the present workpiece made by stand n and wherein said stand correction factor SCFn is used to determine the respective stand n screwdown movement relative to a subsequent workpiece similar to said present workpiece.
Claim 6
Dependent Claim
128 words
The gauge control system as set forth in claim 1, including means for determining a correction factor according to the equation where FCF is the determined force correction factor for subsequent passes of said present workpiece, FM is the measured roll force of saId one roll stand during said first pass of the present workpiece through said stand SCF is the stand correction factor in relation to a previous similar workpiece for said one roll stand, and F is the predicted roll force for said one roll stand in accordance with the actual reduction made in the gauge of the present workpiece by said stand, and wherein said correction factor is used to determine the respective corrective screwdown movements for subsequent passes in relation to said present workpiece.
Claim 7
Dependent Claim
44 words
The gauge control system as set forth in claim 4, including means for providing a unity stand correction factor SCFn for stand n when said subsequent workpiece is one of a different alloy and a different target gauge in relation to said present workpiece.
Claim 8
Dependent Claim
26 words
The gauge control system as set forth in claim 1, including means for providing a unity correction factor when said correction factor is outside predetermined limits.
Claim 9
Dependent Claim
165 words
A workpiece gauge control system for a rolling mill having at least one roll stand with a screwdown controlled roll opening and into which a workpiece is passed, said system comprising: means for sensing the actual roll force at said one roll stand during a first pass of said workpiece through said one roll stand; means for determining the actual reduction taken in the gauge of said workpiece during said first pass through said one roll stand; means for determining a predicted roll force for said one roll stand in accordance with said actual reduction during said first pass; means for determine a correction factor in accordance with a ratio of said actual roll force to said predicted roll force, and means determining determining a screwdown movement at least a second pass of said workpiece through a roll stand of force; rolling mill, with the latter said means being responsive to said correction factor for determining the screwdown movement for at least said second pass.
Claim 10
Dependent Claim
165 words
A workpiece gauge control system for a rolling mill having at least one roll stand with a screwdown controlled roll opening and into which a workpiece is passed, said system comprising: means for sensing the actual roll force at said one roll stand during a first pass of said workpiece through said one roll stand; means for determining the actual reduction taken in the gauge of said workpiece during said first pass through said one roll stand; means for determining a predicted roll force for said one roll stand in accordance with said actual reduction during said first pass; means for determine a correction factor in accordance with a ratio of said actual roll force to said predicted roll force, and means determining determining a screwdown movement at least a second pass of said workpiece through a roll stand of force; rolling mill, with the latter said means being responsive to said correction factor for determining the screwdown movement for at least said second pass.
Claim 11
Dependent Claim
49 words
The guage control system as set forth in claim 8, including screwdown controlling means to effect a corrective screwdown movement in accordance with said correction factor for at least a second pass of said workpiece through a roll stand during the rolling of the head end of said workpiece.
Claim 12
Dependent Claim
48 words
The gauge control system as set forth in claim 8 wherein said means for determining a predicted roll force includes a digital computer, said computer having an input coupled to said actual roll force sensing means and an output coupled to said means for determining a screwdown movement.
Claim 13
Dependent Claim
91 words
The gauge control system as set forth in claim 8, with said means for determining a correction factor being operative according to the equation where FCF is the determined correction factor, FM is the sensed roll force relative to a present workpiece for said one roll stand, SCF is the stand correction factor determined for a previous similar workpiece prior to said present workpiece being loaded into said one roll stand, and F is the predicted force relative to said first pass of the present workpiece through said one roll stand.
Claim 14
Dependent Claim
27 words
The gauge control system as set forth in claim 8 including means for providing a unity correction factor when said correction factor is beyond predetermined value limits.
Claim 15
Dependent Claim
156 words
In a workpiece thickness control system for a rolling mill having at least one roll stand with a controlled roll opening and into which a workpiece is passed, the combination of: means for sensing the actual roll force of said one roll stand of said rolling mill during a first pass of said workpiece through said one roll stand; means for determining the actual delivery thickness of said workpiece after said first pass; means for determining a predicted roll force for said first pass in accordance with the actual delivery thickness of said workpiece after said first pass; means for determining an operation correction factor in accordance with a ratio between said actual roll force duriNg said first pass and said predicted roll force during said first pass; and means responsive to said operation correction factor for determining the roll opening for a subsequent pass of said workpiece through a roll stand of said rolling mill.
Claim 16
Dependent Claim
156 words
In a workpiece thickness control system for a rolling mill having at least one roll stand with a controlled roll opening and into which a workpiece is passed, the combination of: means for sensing the actual roll force of said one roll stand of said rolling mill during a first pass of said workpiece through said one roll stand; means for determining the actual delivery thickness of said workpiece after said first pass; means for determining a predicted roll force for said first pass in accordance with the actual delivery thickness of said workpiece after said first pass; means for determining an operation correction factor in accordance with a ratio between said actual roll force duriNg said first pass and said predicted roll force during said first pass; and means responsive to said operation correction factor for determining the roll opening for a subsequent pass of said workpiece through a roll stand of said rolling mill.
Claim 17
Dependent Claim
39 words
The control system of claim 13, with said means for determining the roll opening of a roll stand being operative to effect a desired reduction in the thickness of the head end of said workpiece during said second pass.
Claim 18
Dependent Claim
166 words
In the method of controlling the operation of a rolling mill for reducing the thickness of a workpiece, said rolling mill including at least one roll stand having a roll opening established in advance of a first pass of said workpiece through said one roll stand of said rolling mill, the steps of: sensing the actual roll force during said first pass of said workpiece through said one roll stand; establishing the actual reduction made in the thickness of said workpiece during said first pass; establishing a predicted roll force in accordance with the reduction made in the thickness of said workpiece during said first pass of the workpiece through said one roll stand; establishing an operation correction factor in accordance with a ratio of said actual for roll force and said predicted roll force; and establishing in accordance with said correction factor the roll opening of a roll stand of said rolling mill for a second pass of the workpiece through the latter roll stand.
Claim 19
Dependent Claim
166 words
In the method of controlling the operation of a rolling mill for reducing the thickness of a workpiece, said rolling mill including at least one roll stand having a roll opening established in advance of a first pass of said workpiece through said one roll stand of said rolling mill, the steps of: sensing the actual roll force during said first pass of said workpiece through said one roll stand; establishing the actual reduction made in the thickness of said workpiece during said first pass; establishing a predicted roll force in accordance with the reduction made in the thickness of said workpiece during said first pass of the workpiece through said one roll stand; establishing an operation correction factor in accordance with a ratio of said actual for roll force and said predicted roll force; and establishing in accordance with said correction factor the roll opening of a roll stand of said rolling mill for a second pass of the workpiece through the latter roll stand.
Claim 20
Dependent Claim
14 words
The method of claim 15, operative with particularly the head end of said workpiece.
Claim 21
Dependent Claim
38 words
The method of claim 15 operative with a rolling mill having a plurality of stands, said method being operative with the head end of said workpiece and until said workpiece has entered all stands of said rolling mill.
Claim 22
Dependent Claim
124 words
The workpiece thickness control system of claim 13, including: means for sensing the actual roll force of the last said roll stand during an earlier pass of a previous workpiece through the latter roll stand; means for determining a predicted roll force for said earlier pass in accordance with the actual delivery thickness of said previous workpiece after said earlier pass; means for determining a stand operation correction factor for the latter roll stand in accordance with a ratio between the earlier pass actual roll force and the earlier pass predicted roll force relative to said previous workpiece with said means for determining the roll opening being responsive to said stand operation correction factor when determining the roll opening of the latter 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) | 1974-03-08 | 1974-09-07 | 1975-03-09 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1978-03-08 | 1978-09-07 | 1979-03-09 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1982-03-08 | 1982-09-07 | 1983-03-09 | $7700.00 | Window Closed / Lapsed |