US3855830A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Method and apparatus for controlling plate thickness in a rolling mill
Assignee: Hitachi Ltd
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Filing: 1972-11-27
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Granted: 1974-12-24
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Expires: 1992-11-27
Abstract
Abstract Method and apparatus for controlling plate thickness in a rolling mill, particularly in a cold rolling mill in which rolls are applied with at least one roll separating force acting in the direction opposite to the direction of roll depressing force to obtain a favourable crown shape of a rolled material. A rolled plate thickness (h) at the outlet side is exactly obtained, under a condition in which the roll separating forces are applied, from an equation H So + Q/M + (P - Q)/K wherein Q represents the actual measurement of the roll separating force; P represents the actual measurement of the roll depressing force; K represents the modulus of rigidity of the whole mill; M represents the modulus of rigidity of the rolls and the housing; and So represents the adjusted value of roll clearance, TO THEREBY CONTROL THE PLATE THICKNESS BY ADJUSTING THE ROLL SEPARATING FORCES AND THE ROLL DEPRESSING FORCE IN ACCORDANCE WITH VALUES CALCULATED FROM THE EQUATION.
Inventors
- 👤 H Kitanosono
- 👤 T Kubo
- 👤 S Shida
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-11-01 22:09
CPC Classifications
B; B21; B21B; B21B37/00; B21B37/28; B21B37/38
Claims Analysis
Total Claims: 8
Claim 1
Independent Claim
393 words
Apparatus for controlling the thickness of a rolled material in a rolling mill of a type having a pair of work rolls and at least a pair of back up rolls wherein a roll separating force is applied between the roll bearings of the work rolls and between the roll bearings of the back up rolls of a roll stand in the direction opposite to a roll depressing force, said apparatus comprising means for setting the roll clearance and for providing an output indicative thereof including roll depressing force control means; means for setting the roll separating force for the work roll bearings and for the back up roll bearings and for providing an output indicative thereof including roll separating force control means for the work roll bearings and for the back up roll bearings; setting means for providing an output indicative of the modulus of rigidity between the roll bearings and a housing and the modulus of rigidity of the whole mill; a detector for providing an output indicative of the roll depressing force; a detector for providing an output indicative of the roll separating force at the work roll bearings and a detector for providing an output indicative of the roll separating force at the back up roll bearings; plate thickness operational means responsive to the outputs of said setting means and detectors for providing an output indicative of the thickness of the rolled material on the exit side of the roll stand; a compressor for comparing the output of said operational means with a desired value to determine the deviation therebetween and providing an output indicative thereof; and control means for recedving the output of said comparator for generating a control signal to control at least one of said roll depressing force control means and said roll separating force control means for varying at least one of the depressing force and separating force at both the work roll bearings and back up roll bearings, and further comprising a detector for detecting the amount of crown of the rolled material on the exit side of the roll stand and shape control means for receiving the output of said crown detector and generating a signal to control said roll separating force control means for varying the separating force at the work and back up roll bearings so as to eliminate the crown.
Claim 2
Dependent Claim
393 words
Apparatus for controlling the thickness of a rolled material in a rolling mill of a type having a pair of work rolls and at least a pair of back up rolls wherein a roll separating force is applied between the roll bearings of the work rolls and between the roll bearings of the back up rolls of a roll stand in the direction opposite to a roll depressing force, said apparatus comprising means for setting the roll clearance and for providing an output indicative thereof including roll depressing force control means; means for setting the roll separating force for the work roll bearings and for the back up roll bearings and for providing an output indicative thereof including roll separating force control means for the work roll bearings and for the back up roll bearings; setting means for providing an output indicative of the modulus of rigidity between the roll bearings and a housing and the modulus of rigidity of the whole mill; a detector for providing an output indicative of the roll depressing force; a detector for providing an output indicative of the roll separating force at the work roll bearings and a detector for providing an output indicative of the roll separating force at the back up roll bearings; plate thickness operational means responsive to the outputs of said setting means and detectors for providing an output indicative of the thickness of the rolled material on the exit side of the roll stand; a compressor for comparing the output of said operational means with a desired value to determine the deviation therebetween and providing an output indicative thereof; and control means for recedving the output of said comparator for generating a control signal to control at least one of said roll depressing force control means and said roll separating force control means for varying at least one of the depressing force and separating force at both the work roll bearings and back up roll bearings, and further comprising a detector for detecting the amount of crown of the rolled material on the exit side of the roll stand and shape control means for receiving the output of said crown detector and generating a signal to control said roll separating force control means for varying the separating force at the work and back up roll bearings so as to eliminate the crown.
Claim 3
Dependent Claim
359 words
Apparatus for controlling the thickness of a rolled material in a rolling mill of a type having a pair of work rolls and at least a pair of back up rolls wherein a roll separating force is applied between the roll bearings of the work rolls and between the roll bearings of the back up rolls of a roll stand in the direction opposite to a roll depressing force, said apparatus comprising means for setting the roll clearance and for providing an output indicative thereof including roll depressing force control means; means for setting the roll separating force for the work roll bearings and for the back up roll beaRings and for providing an output indicative thereof including roll separating force control means for the work roll bearings and for the back up roll bearings; setting means for providing an output indicative of the modulus of rigidity between the roll bearings and a housing and the modulus of rigidity of the whole mill; a detector for providing an output indicative of the roll depressing force; a detector for providing an output indicative of the roll separating force at the work roll bearings and a detector for providing an output indicative of the roll separating force at the back up roll bearings; plate thickness operational means responsive to the outputs of said setting means and detectors for providing an output indicative of the thickness of the rolled material on the exit side of the roll stand; a comparator for comparing the output of said operational means with a desired value to determine the deviation therebetween and providing an output indicative thereof; and control means for receiving the output of said comparator for generating a control signal to control at least one of said roll depressing force control means and said roll separating force control means for varying at least one of the depressing force and separating force at both the work roll bearings and back up roll bearings, and a thickness detector provided on the exit side of the roll stand and the roll clearance setting for the next rolling operation being corrected by the output of said thickness detector.
Claim 4
Dependent Claim
359 words
Apparatus for controlling the thickness of a rolled material in a rolling mill of a type having a pair of work rolls and at least a pair of back up rolls wherein a roll separating force is applied between the roll bearings of the work rolls and between the roll bearings of the back up rolls of a roll stand in the direction opposite to a roll depressing force, said apparatus comprising means for setting the roll clearance and for providing an output indicative thereof including roll depressing force control means; means for setting the roll separating force for the work roll bearings and for the back up roll beaRings and for providing an output indicative thereof including roll separating force control means for the work roll bearings and for the back up roll bearings; setting means for providing an output indicative of the modulus of rigidity between the roll bearings and a housing and the modulus of rigidity of the whole mill; a detector for providing an output indicative of the roll depressing force; a detector for providing an output indicative of the roll separating force at the work roll bearings and a detector for providing an output indicative of the roll separating force at the back up roll bearings; plate thickness operational means responsive to the outputs of said setting means and detectors for providing an output indicative of the thickness of the rolled material on the exit side of the roll stand; a comparator for comparing the output of said operational means with a desired value to determine the deviation therebetween and providing an output indicative thereof; and control means for receiving the output of said comparator for generating a control signal to control at least one of said roll depressing force control means and said roll separating force control means for varying at least one of the depressing force and separating force at both the work roll bearings and back up roll bearings, and a thickness detector provided on the exit side of the roll stand and the roll clearance setting for the next rolling operation being corrected by the output of said thickness detector.
Claim 5
Dependent Claim
407 words
Apparatus for controlling the thickness of a rolled material in a rolling mill of a type having a pair of work rolls and at least a pair of back up rolls wherein a roll separating force is applied between the roll bearings of the work rolls and between the roll bearings of the back up rolls of a roll stand in the direction opposite to a roll depressing force, said apparatus comprising means for setting the roll clearance and for providing an output indicative thereof including roll depressing force control means; means for setting the roll separating force for the work roll bearings and for the back up roll bearings and for providing an output indicative thereof including roll separating force control means for the work roll bearings and for the back up roll bearings; setting means for providing an output indicative of the modulus of rigidity between the roll bearings and a housing and the modulus of rigidity of the whole mill; a detector for providing an output indicative of the roll depressing force; a detector for providing an output indicative of the roll separating force at the work roll bearings and a detector for providing an output indicative of the roll separating force at the back up roll bearings; plate thickness operational means responsive to the outputs of said setting means and detectors for providing an output indicative of the thickness of the rolled material on the exit side of the roll stand; a comparator for comparing the output of said operational means with a desired value to determine the deviation therebetween and providing an output indicative thereof; and control means for receiving the output of said comparator for generating a control signal to control at least one of said roll depressing force control means and said roll separating force control means for varying at least one of the depressing force and separating force at both the work roll bearings and back up roll bearings, and further comprising a plurality of thickness detectors provided in the widthwise direction of the material being rolled to detect the amount of crown of the material on the exit side of the roll stand, means for calculating the amount of crown from the output difference of said thickness detectors and means for applying the output of said crown calculator means to said control means to control said roll depressing force control means and said roll separating force control means.
Claim 6
Dependent Claim
407 words
Apparatus for controlling the thickness of a rolled material in a rolling mill of a type having a pair of work rolls and at least a pair of back up rolls wherein a roll separating force is applied between the roll bearings of the work rolls and between the roll bearings of the back up rolls of a roll stand in the direction opposite to a roll depressing force, said apparatus comprising means for setting the roll clearance and for providing an output indicative thereof including roll depressing force control means; means for setting the roll separating force for the work roll bearings and for the back up roll bearings and for providing an output indicative thereof including roll separating force control means for the work roll bearings and for the back up roll bearings; setting means for providing an output indicative of the modulus of rigidity between the roll bearings and a housing and the modulus of rigidity of the whole mill; a detector for providing an output indicative of the roll depressing force; a detector for providing an output indicative of the roll separating force at the work roll bearings and a detector for providing an output indicative of the roll separating force at the back up roll bearings; plate thickness operational means responsive to the outputs of said setting means and detectors for providing an output indicative of the thickness of the rolled material on the exit side of the roll stand; a comparator for comparing the output of said operational means with a desired value to determine the deviation therebetween and providing an output indicative thereof; and control means for receiving the output of said comparator for generating a control signal to control at least one of said roll depressing force control means and said roll separating force control means for varying at least one of the depressing force and separating force at both the work roll bearings and back up roll bearings, and further comprising a plurality of thickness detectors provided in the widthwise direction of the material being rolled to detect the amount of crown of the material on the exit side of the roll stand, means for calculating the amount of crown from the output difference of said thickness detectors and means for applying the output of said crown calculator means to said control means to control said roll depressing force control means and said roll separating force control means.
Claim 7
Dependent Claim
347 words
Apparatus for controlling the thickness of a rolled material in a rolling mill of a type having a pair of woRk rolls and at least a pair of back up rolls wherein a roll separating force is applied between the roll bearings of the work rolls and between the roll bearings of the back up rolls of a roll stand in the direction opposite to a roll depressing force, said apparatus comprising means for setting the roll clearance and for providing an output indicative thereof including roll depressing force control means; means for setting the roll separating force for the work roll bearings and for the back up roll bearings and for providing an output indicative thereof including roll separating force control means for the work roll bearings and for the back up roll bearings; setting means for providing an output indicative of the modulus of rigidity between the roll bearings and a housing and the modulus of rigidity of the whole mill; a detector for providing an output indicative of the roll depressing force; a detector for providing an output indicative of the roll separating force at the work roll bearings and a detector for providing an output indicative of the roll separating force at the back up roll bearings; plate thickness operational means responsive to the outputs of said setting means and detectors for providing an output indicative of the thickness of the rolled material on the exit side of the roll stand; a comparator means for comparing the output of said operational means with a desired value to determine the deviation therebetween and providing an output indicative thereof; and control means for receiving the output of said comparator means for generating a control signal to control at least one of said roll depressing force control means and said roll separating force control means for varying at least one of the depressing force and separating force at both the work roll bearings and back up roll bearings, said control means controlling said roll depressing force means in response to the output of said comparator means.
Claim 8
Dependent Claim
347 words
Apparatus for controlling the thickness of a rolled material in a rolling mill of a type having a pair of woRk rolls and at least a pair of back up rolls wherein a roll separating force is applied between the roll bearings of the work rolls and between the roll bearings of the back up rolls of a roll stand in the direction opposite to a roll depressing force, said apparatus comprising means for setting the roll clearance and for providing an output indicative thereof including roll depressing force control means; means for setting the roll separating force for the work roll bearings and for the back up roll bearings and for providing an output indicative thereof including roll separating force control means for the work roll bearings and for the back up roll bearings; setting means for providing an output indicative of the modulus of rigidity between the roll bearings and a housing and the modulus of rigidity of the whole mill; a detector for providing an output indicative of the roll depressing force; a detector for providing an output indicative of the roll separating force at the work roll bearings and a detector for providing an output indicative of the roll separating force at the back up roll bearings; plate thickness operational means responsive to the outputs of said setting means and detectors for providing an output indicative of the thickness of the rolled material on the exit side of the roll stand; a comparator means for comparing the output of said operational means with a desired value to determine the deviation therebetween and providing an output indicative thereof; and control means for receiving the output of said comparator means for generating a control signal to control at least one of said roll depressing force control means and said roll separating force control means for varying at least one of the depressing force and separating force at both the work roll bearings and back up roll bearings, said control means controlling said roll depressing force means in response to the output of said comparator means.
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) | 1977-12-23 | 1978-06-24 | 1978-12-24 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1981-12-23 | 1982-06-24 | 1982-12-24 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1985-12-23 | 1986-06-24 | 1986-12-24 | $7700.00 | Window Closed / Lapsed |