Patent US3750437A successfully refreshed from Google Patents.
US3750437A
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Method and apparatus for controlling continuous tandem rolling mills
Assignee: NIPPON KK
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Filing: 1971-02-26
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Granted: 1973-08-07
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Expires: 1991-02-26
Abstract
Abstract In a continuous tandem rolling mill, for varying the gauge of a strip during high speed rolling operation thereof, the number of pulse signals from a pulse transmitter associated with a deflector roller on the entry side of a plurality of mill stands is counted in response to a signal from a gauge varying point detector disposed on the entry side of the mill, the first mill stand is set to a predetermined rolling schedule when the number of pulse signals counted has reached a predetermined value under the assumption that the gauge varying point reaches the first mill stand, at the same time the counting operation of the number of pulses from a pulse transmitter associated with the roll of the first mill stand is commenced, the second mill stand is set to the predetermined rolling schedule when the counted number of pulses from the last mentioned pulse transmitter reaches the predetermined value, and similar setting operations are repeated for succeeding mill stands until the last mill stand is set to the predetermined rolling schedule.
Inventors
- 👤 S Fujii
- 👤 M Ishida
- 👤 M Kamata
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-10-27 23:38
CPC Classifications
B; B21; B21B; B21B37/00; B21B37/16; B21B37/24; B21B37/26
Claims Analysis
Total Claims: 10
Claim 1
Independent Claim
188 words
In a tandem rolling mill wherein gauge of a strip is varied during rolling operation, a method of controlling gauge comprising a steps of commencing counting of pulse signals emitted from a pulse transmitter associated with a deflector roller on the entry side of a plurality of mill stands in response to a signal from a gauge varying point detector which is disposed on the entry side of said plurality of mill stands to detect the passage of said gauge varying point on said strip being rolled, setting a first mill stand to a predetermined rolling schedule when the number of pulse signals counted has reached a predetermined value corresponding to when that said gauge varying point reaches said first mill stand, concurrently commencing counting of pulses from a pulse transmitter associated with a roll of said first mill stand, setting a second mill stand to said predetermined rolling schedule when the counted number of pulse signals from said last mentioned pulse transmitter reaches a predetermined value and repeating similar setting operations for succeeding mill stands until the last mill stand is set to said predetermined rolling schedule.
Claim 2
Dependent Claim
188 words
In a tandem rolling mill wherein gauge of a strip is varied during rolling operation, a method of controlling gauge comprising a steps of commencing counting of pulse signals emitted from a pulse transmitter associated with a deflector roller on the entry side of a plurality of mill stands in response to a signal from a gauge varying point detector which is disposed on the entry side of said plurality of mill stands to detect the passage of said gauge varying point on said strip being rolled, setting a first mill stand to a predetermined rolling schedule when the number of pulse signals counted has reached a predetermined value corresponding to when that said gauge varying point reaches said first mill stand, concurrently commencing counting of pulses from a pulse transmitter associated with a roll of said first mill stand, setting a second mill stand to said predetermined rolling schedule when the counted number of pulse signals from said last mentioned pulse transmitter reaches a predetermined value and repeating similar setting operations for succeeding mill stands until the last mill stand is set to said predetermined rolling schedule.
Claim 3
Dependent Claim
62 words
The control method according to claim 1 wherein said predetermined value of said counted number of pulse signal is given by an equation k lN/(R (1 + f)) where l represents the distance between adjacent mill stands, R the diameter of the mill roll, N the number of pulses generated per one revolution of said mill rOll and f the forward slip.
Claim 4
Dependent Claim
33 words
The control method according to claim 1 wherein said predetermined values are preset in each one of counters respectively associated with said deflector roller and the working rolls of said respective mill stands.
Claim 5
Dependent Claim
47 words
The gauge control method according to claim 1 wherein said gauge varying point is at least one of the following a weld seam between sections of said strip, a perforation, a notch, an optical marking, a magnetic marking and radiation marking which are formed on said strip.
Claim 6
Dependent Claim
26 words
The control method according to claim 4 wherein said perforation, notch, optical marking, magnetic marking or radiation marking are formed on the edge of said strip.
Claim 7
Dependent Claim
219 words
A control system of a continuous tandem rolling mill including a plurality of spaced apart mill stands and a deflector roller means on the entry side of said mill, said control system comprising a gauge varying point detector disposed to detect a gauge varying point on said strip for producing a pulse signal to commence a counting operation, a plurality of pulse counters of number equal to the number of said mill stands, a plurality of pulse transmitters respectively associated with said deflector roller means and the work rolls of said mill stands except for the last mill stand, one of said pulse counters receiving the output pulses from one of said pulse transmitters which is associated with said deflector roller means and for counting the output pulses from said one pulse transmitter after receipt of the pulse signal from said gauge varying point detector, means for applying the output of each preceding counter to each succeeding counter corresponding to successive mill stands, a correction means for presetting a predetermined value corresponding to the number of pulse signals to be counted in each one of said counters, and a schedule set value signal transmitter connected to receive outputs from respective counters for transmitting preset rolling schedules to respective mill stands responsive to said counters counting to said predetermined values.
Claim 8
Dependent Claim
219 words
A control system of a continuous tandem rolling mill including a plurality of spaced apart mill stands and a deflector roller means on the entry side of said mill, said control system comprising a gauge varying point detector disposed to detect a gauge varying point on said strip for producing a pulse signal to commence a counting operation, a plurality of pulse counters of number equal to the number of said mill stands, a plurality of pulse transmitters respectively associated with said deflector roller means and the work rolls of said mill stands except for the last mill stand, one of said pulse counters receiving the output pulses from one of said pulse transmitters which is associated with said deflector roller means and for counting the output pulses from said one pulse transmitter after receipt of the pulse signal from said gauge varying point detector, means for applying the output of each preceding counter to each succeeding counter corresponding to successive mill stands, a correction means for presetting a predetermined value corresponding to the number of pulse signals to be counted in each one of said counters, and a schedule set value signal transmitter connected to receive outputs from respective counters for transmitting preset rolling schedules to respective mill stands responsive to said counters counting to said predetermined values.
Claim 9
Dependent Claim
15 words
The control system according to claim 6 wherein said correction means comprises a correction computer.
Claim 10
Dependent Claim
62 words
The control system according to claim 6 wherein said predetermined value preset by said correction means is given by an equation k lN/ pi R (1 + f) where l represents the distance between adjacent mill stands, R the diameter of the mill roll, N the number of pulses generated per one revolution of said mill roll and f the forward slip.
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) | 1976-08-06 | 1977-02-05 | 1977-08-07 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1980-08-06 | 1981-02-05 | 1981-08-07 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1984-08-06 | 1985-02-05 | 1985-08-07 | $7700.00 | Window Closed / Lapsed |