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US 4,054,043 AGranted
Closed loop integrated gauge and crown control for rolling mills
AssigneeBlaw-Knox Foundry & Mill Machinery, Inc.
InventorWerner W. Eibe
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AssigneeBlaw-Knox Foundry & Mill Machinery, Inc.
InventorWerner W. Eibe
Estimating the term…
In a four-high mill stand separate transducer means are provided for measuring gauge in the bite of the work rolls and for measuring the inclination of work roll axis to the horizontal. Means are provided for generating a gauge command signal proportional to the work gauge and a crown command signal proportional to the desired work roll crown. The gauge and gauge command signals are added algebraically and applied to control the roll pressure producing means in the roll stand, and the crown, crown command and the gauge signals are added algebraically and applied to control the work roll bending means so that changes in the roll bending force do not change gauge, and the gauge and flatness of the rolled product are automatically held constant. A roll crown measuring transducer for high lift mills is also disclosed.
Apparatus for integral gauge and work roll crown control in a rolling mill stand provided with pressure means to vary the gauge of the metal in the mill stand and means to vary the crown of the work rolls, comprising first transducer means positioned to measure the separation between work rolls at chocks thereof and produce a gauge signal therefrom, second transducer means positioned to measure the separation between said work rolls outboard of said chocks and produce a signal therefrom, said signals being utilized to produce a crown signal, means to control the crown varying means in accordance with the algebraic sum of the gauge signal and the crown signal, and means to control the pressure means in correspondence with the gauge signal.
The method of controlling rolling pressure and roll bending pressure in a rolling mill stand so as to provide independent adjustment of work gauge and flatness, comprising continuously measuring the separation between work rolls, converting that measurement to a gauge signal, continuously determining the inclination of a work roll axis to the horizontal, converting that determination to a crown signal opposite in direction to the gauge signal, applying bending pressure to the work roll necks corresponding to the algebraic sum of the gauge and the crown signals, and applying rolling pressure to the work rolls corresponding to the gauge signal and to the algebraic sum of the gauge and the crown signals.
The method of controlling rolling pressure and roll bending pressure in a four-high mill stand provided with variable crown backup rolls comprising continuously measuring the separation between the work rolls, converting that measurement to a gauge signal, continuously determining the inclination of a work roll axis to the horizontal, converting that determination to a crown signal opposite in direction to the gauge signal, applying crowning pressure to the variable crown backup roll corresponding to the algebraic sum of the gauge signal and the crown signal and applying rolling pressure to the work rolls corresponding to the gauge signal.
Dependencies are inferred from the claim text.