US3852983A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Work strip gauge change during rolling in a tandem rolling mill
Assignee: AEG Westinghouse Industrial Automation Corp
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Filing: 1973-04-25
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Granted: 1974-12-10
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Expires: 1993-04-25
Abstract
Abstract A control method and apparatus are disclosed for controlling the gauge of strip material being rolled by a tandem rolling mill while the strip is in motion and moving through the mill. A gauge change in the work strip is accomplished by changing, in proper timed sequence, the stand speed and roll gap openings starting from the first to the last stand. In order to change gauge or thickness of the work strip material during rolling, as the gauge change point engers the first stand the roll gap opening of the first stand is initially changed. As the gauge change point enters each succeeding stand, the speeds of all the previous stands are adjusted for the changed schedule and the tension controlling roll gap system senses the change in tension at the entry side of the gauge change stand and adjusts the gauge change stand roll gap to maintain the desired tension and consequently the desired change in delivery gauge leaving that roll stand.
Inventors
- 👤 J Cook
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-10-27 04:08
CPC Classifications
B; B21; B21B; B21B37/00; B21B37/16; B21B37/24; B21B37/26
Claims Analysis
Total Claims: 17
Claim 1
Independent Claim
137 words
In a gauge control system for a tandem rolling mill having a plurality of roll stands operative to reduce the gauge of a work strip having a gauge change point and being passed through said rolling mill, the combination of means for controlling the operating speed of a first roll stand, and means responsive to the work strip movement for sensing the arrival of said gauge change point at a second roll stand for providing a predetermined change in the operating speed of said first roll stand while maintaining the present operating speed of the second roll stand, with said predetermined change being in accordance with a relationship including the present operating speed of the second roll stand and the new desired work strip delivery gauge from at least one of said first and second roll stands.
Claim 2
Dependent Claim
137 words
In a gauge control system for a tandem rolling mill having a plurality of roll stands operative to reduce the gauge of a work strip having a gauge change point and being passed through said rolling mill, the combination of means for controlling the operating speed of a first roll stand, and means responsive to the work strip movement for sensing the arrival of said gauge change point at a second roll stand for providing a predetermined change in the operating speed of said first roll stand while maintaining the present operating speed of the second roll stand, with said predetermined change being in accordance with a relationship including the present operating speed of the second roll stand and the new desired work strip delivery gauge from at least one of said first and second roll stands.
Claim 3
Dependent Claim
114 words
The gauge control system of claim 1, including means for controlling the operating speed of said second roll stand, with said work strip movement responsive means sensing the arrival of said gauge change point at a third roll stand for providing desired changes respectively in the operating speed of said first roll stand and in the operating speed of said second roll stand while maintaining the present operating speed of the third roll stand, with said desired changes being in accordance with a second relationship including the present operating speed of the third roll stand and the new desired work strip delivery gauge from at least one of said second and third roll stands.
Claim 4
Dependent Claim
81 words
The gauge control system of claim 1, with said predetermined change in the operating speed of said first roll stand being in accordance with the relationship S12 (S21)(H22)/H12 where S12 is the new desired operating spEed for said first roll stand, S21 is the present operating speed for the second roll stand, H22 is the new desired work strip delivery gauge from the second roll stand and H12 is the new desired work strip delivery gauge from the first roll stand.
Claim 5
Dependent Claim
42 words
The gauge control system of claim 1, including means for determining the operating speed of each of said roll stands and the workstrip delivery gauge from each of said roll stands before said gauge change point arrives at said first roll stand.
Claim 6
Dependent Claim
164 words
The gauge control system of claim 1, with said means responsive to the work strip movement being operative to provide said change in the operating speed of said first roll stand in accordance with the relationship SN-1 original speed (N-1)* (original speed N)(final gauge N)/(original speed N-1)(final gauge N-1) where SN-1 is the speed reference for said first roll stand after said gauge point has arrived at said second roll stand, original speed N-1 is the speed reference of said first roll stand before said gauge point arrives at said second roll stand, original speed N is the speed reference of said second roll stand before said gauge point arrives at said second roll stand, final gauge N is the work strip delivery gauge from said second roll stand after said gauge point arrives at said second roll stand and final gauge N-1 is the work strip delivery gauge from said first roll stand after said gauge point arrives at said second roll stand.
Claim 7
Dependent Claim
157 words
In a gauge control system for a tandem rolling mill having a plurality of roll stands operative to reduce the gauge of a work strip having a gauge change point and being passed through said rolling mill, the combination of means for controlling the operating speed of each of said roll stands, means responsive to the movement of said work strip sensing the arrival of said gauge change point at roll stand N of said rolling mill for providing a change in the operating speed of previous roll stand X while maintaining the present operating speed of roll stand N, with said change being in accordance with the relationship SX2 (SN1)(HN2)/HX2 where SX2 is the new speed reference for previous roll stand X, SN1 is the present speed reference for roll stand N, HN2 is the new delivery gauge desired from roll stand N and HX2 is the new delivery gauge desired from previous roll stand X.
Claim 8
Dependent Claim
157 words
In a gauge control system for a tandem rolling mill having a plurality of roll stands operative to reduce the gauge of a work strip having a gauge change point and being passed through said rolling mill, the combination of means for controlling the operating speed of each of said roll stands, means responsive to the movement of said work strip sensing the arrival of said gauge change point at roll stand N of said rolling mill for providing a change in the operating speed of previous roll stand X while maintaining the present operating speed of roll stand N, with said change being in accordance with the relationship SX2 (SN1)(HN2)/HX2 where SX2 is the new speed reference for previous roll stand X, SN1 is the present speed reference for roll stand N, HN2 is the new delivery gauge desired from roll stand N and HX2 is the new delivery gauge desired from previous roll stand X.
Claim 9
Dependent Claim
42 words
The gauge control system of claim 6, with said means responsive to the movement of said work strip being operative to provide a change in the operating speed of each roll stand previous to roll stand N in accordance with said relationship.
Claim 10
Dependent Claim
56 words
The gauge control system of claim 6, including means for controlling the roll opening of at least said roll stand N, with said means responsive to the movement of said work strip providing a predetermined change in the roll opening of said roll stand N when said gauge change point arrives at said roll stand N.
Claim 11
Independent Claim
116 words
A method for controlling the work strip gauge leaving a tandem rolling mill having a plurality of roll stands, with said work strip having a gauge change point passing through said roll stands, the steps of said method comprising determining the arrival of said gauge change point at a first roll stand, providing a first predetermined change in the roll opening of said first roll stand when said gauge change point arrives at said first roll stand, determining the arrival of said gauge change point at a second roll stand, and providing a second predetermined change in the operating speed of said first roll stand when said gauge change point arrives at said second roll stand.
Claim 12
Independent Claim
116 words
A method for controlling the work strip gauge leaving a tandem rolling mill having a plurality of roll stands, with said work strip having a gauge change point passing through said roll stands, the steps of said method comprising determining the arrival of said gauge change point at a first roll stand, providing a first predetermined change in the roll opening of said first roll stand when said gauge change point arrives at said first roll stand, determining the arrival of said gauge change point at a second roll stand, and providing a second predetermined change in the operating speed of said first roll stand when said gauge change point arrives at said second roll stand.
Claim 13
Dependent Claim
47 words
The method of claim 9, including the steps of determining the arrival of said gauge change point at a third roll stand, and providing an additional change in the operating speed of said first rolL stand when said gauge change point arrives at said third roll stand.
Claim 14
Independent Claim
161 words
A method of controlling the work strip gauge leaving a tandem rolling mill having a plurality of roll stands, with said work strip having a gauge change point at which it is desired for the gauge of the work strip leaving the rolling mill to change from a first delivery gauge schedule to a second delivery gauge schedule, the steps of said method comprising determining the arrival of said gauge change point at a selected roll stand of said rolling mill subsequent to at least the first roll stand of said rolling mill, and controlling the operating speed of each roll stand of said rolling mill prior to said selected roll stand when said gauge change point arrives at said selected roll stand in accordance with a predetermined relationship including the operating speed of said selected roll stand for said first schedule and the new desired work strip delivery gauge for said second schedule from at least said selected roll stand.
Claim 15
Independent Claim
161 words
A method of controlling the work strip gauge leaving a tandem rolling mill having a plurality of roll stands, with said work strip having a gauge change point at which it is desired for the gauge of the work strip leaving the rolling mill to change from a first delivery gauge schedule to a second delivery gauge schedule, the steps of said method comprising determining the arrival of said gauge change point at a selected roll stand of said rolling mill subsequent to at least the first roll stand of said rolling mill, and controlling the operating speed of each roll stand of said rolling mill prior to said selected roll stand when said gauge change point arrives at said selected roll stand in accordance with a predetermined relationship including the operating speed of said selected roll stand for said first schedule and the new desired work strip delivery gauge for said second schedule from at least said selected roll stand.
Claim 16
Dependent Claim
51 words
The method of claim 11, including the step of controlling the roll opening of said first roll stand by measuring the actual workpiece delivery gauge for said second schedule leaving said first roll stand in comparison to a desired reference delivery gauge for the work strip leaving said first roll stand.
Claim 17
Dependent Claim
49 words
The method of claim 11, including the step of sensing the work strip tension before each of predetermined roll stands of said rolling mill and controlling the roll opening of each of said predetermined roll stands for maintaining respective desired tension conditions in relation to said predetermined roll stands.
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) | 1977-12-09 | 1978-06-10 | 1978-12-10 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1981-12-09 | 1982-06-10 | 1982-12-10 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1985-12-09 | 1986-06-10 | 1986-12-10 | $7700.00 | Window Closed / Lapsed |