Title

FORCE FEED FORWARD AUTOMATIC GAGE CONTROL OF A HOT ROLLING MILL

FORCE FEED FORWARD AUTOMATIC GAGE CONTROL OF A HOT ROLLING MILL

Authorship

WAGNER, FRANCIS; MURATORI, FRANCO; VIGLIOCCO, ANDRÉS; MÉNDEZ, JULIO; SARJANOVIC, ALEJANDRO; MARTÍNEZ THOSS, RÉGULO

WAGNER, FRANCIS

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MURATORI, FRANCO

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VIGLIOCCO, ANDRÉS

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MÉNDEZ, JULIO

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SARJANOVIC, ALEJANDRO

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MARTÍNEZ THOSS, RÉGULO

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DOI

10.5151/2594-5297-LA5748

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Abstract

The concept of applying feed forward control to solve the question of thickness control for hot rolled coils has been successfully implemented at the Hot Strip Mill of SIDERAR S.A.I.C. through the P.F.F. A.G.C. By keeping constant the roll gap at the first stand of the Finishing mill, hardness variations of material determine roll force modifications which are used to calculate gap and speed adjustments on the next stands. The adjustments are done just before the strip portion that has produced a disturbance in the first stand arrives to every downstream stand. The system takes into account the strip speed and the response time of the screw downs in order to define the precise timing to change the references for the different drives. By using this method, mill performance is nowadays excellent and equivalent to what could be expected if the mill would have been modified to mount hydraulic capsules in the stands, thus making such high-cost modifications unnecessary.

The concept of applying feed forward control to solve the question of thickness control for hot rolled coils has been successfully implemented at the Hot Strip Mill of SIDERAR S.A.I.C. through the P.F.F. A.G.C. By keeping constant the roll gap at the first stand of the Finishing mill, hardness variations of material determine roll force modifications which are used to calculate gap and speed adjustments on the next stands. The adjustments are done just before the strip portion that has produced a disturbance in the first stand arrives to every downstream stand. The system takes into account the strip speed and the response time of the screw downs in order to define the precise timing to change the references for the different drives. By using this method, mill performance is nowadays excellent and equivalent to what could be expected if the mill would have been modified to mount hydraulic capsules in the stands, thus making such high-cost modifications unnecessary.