JPS56109107A - Controller for load balance in multistage continuous rolling mill - Google Patents

Abstract

PURPOSE: To prevent the fluctuation of product shape and the load concentration in a specific stand, by holding constant the rolling load depending on the distribution pattern of initial rolling load for each stand, and by always controlling the rolling load distribution for each rolling stand according to the sheet thickness on the run-out side of the final stand.

CONSTITUTION: If the material ST approaches the first stand F₁, the setup computer 32 presets the roll gap, roll speed, etc., of the rolling stand on each stage. At the same time, the computer 32 transmits the absolute value of sheet thickness on the run-out side of each stand required by the control activity, together with the various rolling conditions DA, as the data DB, to the load balance controller 31, and also determines the critical number of stands for holding good the sheet shape. When the material ST is bitten by the second and following stands, the automatic thickness controller 8 starts the control of sheet thickness. When the material ST arrives at the product thickness detector 11, the goodness of the shape or flatness is decided, and the roll gap and the roll bender are corrected. At this moment, the rolling load of each stand is stored as the initial load distribution pattern by the load balance controller 31, which then starts the control for redistributing the rolling load.

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