Roll gap control method for soft reduction technology for continuous casting

Abstract

The invention discloses a roll gap control method for a soft reduction technology for continuous casting. The method comprises the following steps: respectively obtaining a displacement feedback signal and an actual reduction force of an upper roll of a withdrawal and straightening unit by a displacement sensor and a pressure sensor, and conveying the displacement feedback signal and the actual reduction force to a compensator; performing pressure value compensation on the displacement feedback signal so as to generate a corrected value, and transmitting the corrected value to a comparator; comparing the corrected value with a set value for the roll gap so as to generate a comparison value; transmitting the comparison value to a position regulator by the comparator, adjusting opening of aservo valve and controlling a reduction force of a hydraulic cylinder so as to adjust the upper roll connected with the hydraulic cylinder so that the actual value and the set value for the roll gap are consistent with each other; and performing stepwise reduction by utilizing the upper rolls of a plurality of withdrawal and straightening units so as to reach total rolling reduction. In the method, by adopting the measure of pressure value compensation for the displacement feedback signal, the influence of distortion of the displacement feedback signal on the displacement sensor resulting from greater reduction force applied to a casting blank can be eliminated, thus creating a good condition for achieving ideal metallurgical process effect by utilizing the soft reduction technology.

Description

technical field [0001] The invention relates to the roll gap control technology of continuous casting soft reduction, more specifically relates to a continuous casting soft reduction roll gap control method. Background technique [0002] In the metallurgical process, the soft reduction technology is often used in the end area of ​​the liquid core of the continuous casting slab. The soft reduction technology refers to compensating the solidification shrinkage of the slab by applying a uniform external force at the end area of ​​the liquid core of the continuous casting slab to form a certain amount of compression. In this way, on the one hand, it can eliminate or reduce the internal voids formed by the shrinkage of the slab, and prevent the solute-enriched molten steel between the grains from flowing laterally to the center of the slab; The solute-enriched molten steel flows in the opposite direction along the casting direction, so that the solute elements are redistributed ...

AI Technical Summary

Problems solved by technology

[0007] Aiming at the problem in the prior art that the pressure applied by the upper roll to the slab will produce a reaction force on the tension leveler, thereby distorting the displacement fee

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