A strip shape control method for dynamically changing strip width in cold tandem mill

Abstract

The invention discloses a strip shape control method for dynamically changing the specification of the steel strip width of a cold tandem rolling mill, which comprises the following steps: during the control process of the dynamic specification changing of the strip steel width of a cold tandem rolling mill, the roll shifting mode of the middle roll is carried out in two stages ; The shifting of the intermediate rolls is to perform a roll shifting at the positions before and after the welding seam between the front and rear coils of strip steel respectively. The roll shifting method of the intermediate roll is implemented in two steps on the front and rear coils, and combined with the combined control strategy of bending force compensation, the control effect of the work roll and intermediate roll bending is improved, so that the cold-rolled steel coil can be rolled in the width The shape of the strip during the transition period is controlled; the ability to adjust the shape on-line can be improved to achieve the purpose of continuous rolling, and at the same time, the number of abnormal off-line rolls can be indirectly reduced, and the slab ratio of the unit can be improved.

Description

Technical field [0001] The present invention relates to the field of rolling steel, in particular, to a plate-shaped control method of a dynamic variable size of a cold rolling mill. Background technique [0002] The six-roll-rolling mill is a common rolling mill disposed in the coated cold rolling combined unit; in the unit, since the non-head rolling, the hot rolled coil is welded to the cold rolling unit through the inlet welder, and passed the courage Adjusting the continuous high speed rolling of the mill, omitting the process of wearing, acceleration and tailing per volume steel, which not only improves the output of the unit, but also significantly improves the quality of the product, but also brings the need Dynamically transform specifications. [0003] The stability of the rolling parameters of dynamic variable specifications has a very important meaning of achieving full continuous rolling. Cold rolling dynamic variations are different from steel, and the thickness is ...

AI Technical Summary

Problems solved by technology

[0002] The six-high tandem cold rolling mill is a common rolling mill configured in the combined pickling and cold-rolling unit; in this unit, due to the use of endless rolling, the hot-rolled coils are welded by the entrance welding machine and continuously enter the cold-rolling unit. The adjustment maintains the continuous high-speed rolling of the rolling mill, and omits the processes of strip threading, acceleration and deceleration, and tail flicking of each coil, which not only increases the output of the unit, but also significantly improves the quality of the product, but it also brings demand. The problem with dynamically changing specifications

There is a problem with this method: when the width of the strip changes greatly, the movement of the intermediate roll cannot enter the preset position in time and accurately, resulting in the bending force of the work roll and the intermediate roll exceeding the roll shape adjustment capability, which cannot meet the dynamic variable specification rolling process The control requirements for the actual crown and actual deflection of the rolls in the middle of the day will cause the deterioration of the strip shape and the rolling accidents will easily occur.

The problem with this measure is that the production line must be shut down, and the effective operating time is forced to be reduced; and once the shutdown is resumed, at least 3 tons of waste products with inconsistent thickness will inevitably be produced each time

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