US3882705A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Roll eccentricity correction system and method
Assignee: AEG Westinghouse Industrial Automation Corp
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Filing: 1974-03-07
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Granted: 1975-05-13
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Expires: 1994-03-07
Abstract
Abstract A control system and method are disclosed to operate with at least one roll stand of a rolling mill to measure and record the eccentricity of each back-up roll, to monitor the rotation of the back-up rolls during the rolling process, and to correct the roll force gauge control equation for the eccentricity of the rolls, as they rotate. This correction will remove the workpiece delivery gauge error induced directly by the eccentricity, and the gauge error induced by the improper response of the roll force gauge control equation to the eccentricity.
Inventors
- 👤 Richard Q Fox
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-11-06 04:32
CPC Classifications
B; B21; B21B; B21B37/00; B21B37/58; B21B37/66
Claims Analysis
Total Claims: 11
Claim 1
Independent Claim
196 words
A method of controlling the delivery gauge of a workpiece passing through a rolling mill stand having a pair of work rolls between which said workpiece is passed, with said work rolls respectively being operative with a pair of back-up rolls having eccentricity, said method including the steps of: establishing values of said eccentricity of at least one back-up roll in relation to first and second angular positions of the other said back-up roll and in accordance with a predetermined relationship including the roll force between said work rolls and the angle of rotation for each of said first and second angular positions of said other back-up roll before said workpiece is passed between said work rolls, measuring the angular position of said one back-up roll with said workpiece passing between said work rolls for selecting one of said values of eccentricity in relation to said measured angular position, and controlling the delivery gauge of said workpiece passed between said work rolls in relation to the measured unloaded roll opening between said work rolls, the roll force between said work rolls, said selected value of eccentricity and the known modulus of elasticity of said roll stand.
Claim 2
Independent Claim
196 words
A method of controlling the delivery gauge of a workpiece passing through a rolling mill stand having a pair of work rolls between which said workpiece is passed, with said work rolls respectively being operative with a pair of back-up rolls having eccentricity, said method including the steps of: establishing values of said eccentricity of at least one back-up roll in relation to first and second angular positions of the other said back-up roll and in accordance with a predetermined relationship including the roll force between said work rolls and the angle of rotation for each of said first and second angular positions of said other back-up roll before said workpiece is passed between said work rolls, measuring the angular position of said one back-up roll with said workpiece passing between said work rolls for selecting one of said values of eccentricity in relation to said measured angular position, and controlling the delivery gauge of said workpiece passed between said work rolls in relation to the measured unloaded roll opening between said work rolls, the roll force between said work rolls, said selected value of eccentricity and the known modulus of elasticity of said roll stand.
Claim 3
Dependent Claim
19 words
The method of claim 1, with said predetermined relationship including a determined average roll force between said work Rolls.
Claim 4
Dependent Claim
38 words
The method of claim 1, with said respective values of said eccentricity being established for each of a top back-up roll operative with a top work roll and a bottom back-up roll operative with a bottom work roll.
Claim 5
Dependent Claim
26 words
The method of claim 1, with said predetermined relationship including the force between said work rolls for a predetermined angular rotation of said other back-up roll.
Claim 6
Dependent Claim
85 words
The method of claim 1, with said step of controlling the delivery gauge being in accordance with the following relationship GE (SD - LOSD) + ET + EB + (F - LOF) * K where (SD - LOSD) is a predetermined change in roll opening position, where (F - LOF) is a predetermined change in stand roll force, where ET is an established value of eccentricity for the top back-up roll and where EB is an established value of eccentricity for the bottom back-up roll.
Claim 7
Independent Claim
187 words
An apparatus for controlling the delivery gauge of a workpiece leaving a roll stand having a pair of work rolls respectively positioned between a pair of back-up rolls, the combination of: means for establishing the eccentricity of at least one of said back-up rolls in relation to first and second angular positions of the other of said back-up rolls in accordance with a predetermined relationship including the roll force between said work rolls and the angle of rotation for each of said first and second angular positions of said other back-up roll before said workpiece is passed between said work rolls, means for determining a first error in said delivery gauge in relation to the measured roll force between said work rolls and the known elasticity characteristic of said roll stand, means for determining a second error in said delivery gauge in relation to the established eccentricity of at least one of said back-up rolls and means for controlling said delivery gauge in relation to said angular position of at least said one back-up roll in accordance with a predetermined relationship including said first and second errors.
Claim 8
Independent Claim
187 words
An apparatus for controlling the delivery gauge of a workpiece leaving a roll stand having a pair of work rolls respectively positioned between a pair of back-up rolls, the combination of: means for establishing the eccentricity of at least one of said back-up rolls in relation to first and second angular positions of the other of said back-up rolls in accordance with a predetermined relationship including the roll force between said work rolls and the angle of rotation for each of said first and second angular positions of said other back-up roll before said workpiece is passed between said work rolls, means for determining a first error in said delivery gauge in relation to the measured roll force between said work rolls and the known elasticity characteristic of said roll stand, means for determining a second error in said delivery gauge in relation to the established eccentricity of at least one of said back-up rolls and means for controlling said delivery gauge in relation to said angular position of at least said one back-up roll in accordance with a predetermined relationship including said first and second errors.
Claim 9
Dependent Claim
65 words
The apparatus of claim 6, with said first error being determined by the relationship GE (SD - LOSD) + (F - LOF) * K where GE is said first error, where (SD - LOSD) is a predetermined change in the roll opening of said roll stand, where (F - LOF) is a predetermined change in said roll force and where K is said elasticity characteristic.
Claim 10
Dependent Claim
19 words
The apparatus of claim 6, with said second error including a determined average roll force between said work rolls.
Claim 11
Dependent Claim
47 words
The apparatus of claim 6, with said predetermined relationship being GE (SD - LOSD) + ET + EB + (F - LOF) * K where (SD - LOSD) + (F - LOF) * K determines said first error and where ET + EB determines said second error.
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) | 1978-05-12 | 1978-11-11 | 1979-05-13 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1982-05-12 | 1982-11-11 | 1983-05-13 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1986-05-12 | 1986-11-11 | 1987-05-13 | $7700.00 | Window Closed / Lapsed |