US3688532A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Control system for tandem rolling mill based on the constant volume principle
Assignee: Westinghouse Electric Corp
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Filing: 1970-11-24
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Granted: 1972-09-05
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Expires: 1990-11-24
Abstract
Abstract Automatic gauge control system for tandem rolling mills based on the constant volume principle. The percentage gauge deviation from desired gauge at the output side of a first stand in a tandem mill is derived and stored until the off-gauge material reaches the bite of the rolls of a succeeding stand; whereupon the first stand speed is increased or decreased by an amount equal to the percent gauge deviation from the desired gauge at the output of the first stand. Tensiometer means are provided between the first and second stands for controlling the screwdown on the second stand in a manner such that when the speed of the first stand is varied in response to a deviation in gauge from desired gauge, the tension between the stands is also varied as is the screwdown on the second stand to compensate for the tension variation. The adjustment to the screwdown on the second stand, in addition to maintaining tension constant, also compensates for off-gauge material.
Inventors
- 👤 Antonio Vicente Silva
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-11-05 14:06
CPC Classifications
B; B21; B21B; B21B37/00; B21B37/16
Claims Analysis
Total Claims: 11
Claim 1
Independent Claim
202 words
In a rolling mill control system for a tandem rolling mill including at least first and second stands, the combination of: means including a gauge detector located at a point beyond the bite of the rolls of said first stand for producing a first electrical signal which varies as a function of the difference between the actual gauge at said point and the desired output gauge from said first stand, means for producing a second electrical siGnal which varies as a function of the delivery speed of material from said first stand, means responsive to said first and second electrical signals for producing a third electrical signal which varies as a function of the product of the magnitude of said first and second electrical signals, means for controlling the speed at which material is delivered from said first stand as a function of variations in said third electrical signal, and means including a tensiometer device for sensing variations in tension in the material being rolled between said stands and for adjusting the spacing between the rolls of said second stand to maintain said tension constant while correcting for variations in gauge at the output of said first stand from said desired gauge.
Claim 2
Dependent Claim
202 words
In a rolling mill control system for a tandem rolling mill including at least first and second stands, the combination of: means including a gauge detector located at a point beyond the bite of the rolls of said first stand for producing a first electrical signal which varies as a function of the difference between the actual gauge at said point and the desired output gauge from said first stand, means for producing a second electrical siGnal which varies as a function of the delivery speed of material from said first stand, means responsive to said first and second electrical signals for producing a third electrical signal which varies as a function of the product of the magnitude of said first and second electrical signals, means for controlling the speed at which material is delivered from said first stand as a function of variations in said third electrical signal, and means including a tensiometer device for sensing variations in tension in the material being rolled between said stands and for adjusting the spacing between the rolls of said second stand to maintain said tension constant while correcting for variations in gauge at the output of said first stand from said desired gauge.
Claim 3
Dependent Claim
25 words
The rolling mill control system of claim 1 including means for maintaining the delivery speed of material from said second stand constant at all times.
Claim 4
Dependent Claim
53 words
The rolling mill control system of claim 1 wherein the speed of said first stand is decreased when the actual gauge of material issuing from said first stand is above a predetermined desired gauge and is increased when said gauge at the output of said first stand is below said predetermined desired gauge.
Claim 5
Dependent Claim
24 words
The rolling mill control system of claim 1 wherein said first electrical signal is proportional to the percentage deviation in gauge from desired gauge.
Claim 6
Dependent Claim
38 words
The rolling mill control system of claim 1 wherein said third electrical signal is proportional to the change in speed of delivery from said first stand necessary to correct for a deviation in gauge from said desired gauge.
Claim 7
Dependent Claim
54 words
The rolling mill control system of claim 1 wherein said gauge detector is positioned between said stands, and including means for delaying said first electrical signal by an amount equal to the time required for material being rolled to travel from said gauge detector to the bite of the rolls of said second stand.
Claim 8
Dependent Claim
140 words
In a rolling mill control system for a tandem rolling mill based on the principle of constant volume of material entering and leaving a stand in the mill, the combination of means including a gauge detector located at a point beyond the bite of the rolls of a first stand in said tandem mill for producing an electrical signal which varies as a function of the speed of said first stand as well as the difference between the actual gauge at said point and the desired output gauge from said first stand, and means responsive to said electrical signal and operable upon a stand succeeding said first stand in the tandem mill for varying the spacing between the rolls of said succeeding stand to correct for a deviation in gauge from said desired gauge as detected by said gauge detector.
Claim 9
Dependent Claim
140 words
In a rolling mill control system for a tandem rolling mill based on the principle of constant volume of material entering and leaving a stand in the mill, the combination of means including a gauge detector located at a point beyond the bite of the rolls of a first stand in said tandem mill for producing an electrical signal which varies as a function of the speed of said first stand as well as the difference between the actual gauge at said point and the desired output gauge from said first stand, and means responsive to said electrical signal and operable upon a stand succeeding said first stand in the tandem mill for varying the spacing between the rolls of said succeeding stand to correct for a deviation in gauge from said desired gauge as detected by said gauge detector.
Claim 10
Dependent Claim
18 words
The control system of claim 7 wherein said succeeding stand is that stand immediately succeeding said first stand.
Claim 11
Dependent Claim
25 words
The control system of claim 8 wherein said last-named means includes means for maintaining the tension in the material being rolled constant between said 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) | 1975-09-05 | 1976-03-06 | 1976-09-05 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1979-09-05 | 1980-03-06 | 1980-09-05 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1983-09-05 | 1984-03-06 | 1984-09-05 | $7700.00 | Window Closed / Lapsed |