A Method of Improving the Shape Precision of Hot-rolled Strip

Abstract

The invention relates to a method for improving the shape accuracy of a hot-rolled strip steel plate. The method comprises the following steps of: (1) calculating the stiffness correction coefficientK; and (2) when the roll diameter of a finishing mill changes, feeding a rack for stiffness measurement, calculating the stiffness measurement value of the rack, and simultaneously judging the stiffness deviation value before and after the roll diameter changes; when the size of a backing plate under a support roll of the finishing mill changes, feeding the rack for stiffness measurement, calculating the stiffness measurement value of the rack, and simultaneously judging the stiffness deviation value before and after the backing plate changes. The method has the advantages that calculation andjudgment of the stiffness adjustment correction coefficient are introduced when calculating the roll gap value and the rolling force load distribution of the strip steel, which improves the shape accuracy and quality of the hot-rolled strip steel plate, and reduces steel clogging in a finishing zone and rolling breakage of the finishing tail due to poor shape of the plate, prevents influences onthe roll shape of the coiling head and tail, and improves the quality.

Description

technical field [0001] The invention relates to a method for improving the shape precision of hot-rolled strip steel. Background technique [0002] In the production of hot-rolled strip steel, it is necessary to set the rolling parameters reasonably, distribute the reduction load of the finishing mill reasonably (including the rolling force of each stand, the reduction amount, etc.), and reduce the uneven deformation during the rolling process. An important technical measure to control the shape of the strip is also a basic means to ensure a good shape. Therefore, from the calculation of the load distribution of the roll gap before the strip bites to the dynamic adjustment before the end of the steel throwing, if the accurate calculation of the rolling force is separated, the strip shape cannot be controlled. During normal production, the end station data collector FSU mainly controls the thickness and temperature of the finished rolling exit strip by setting the pressing d...

AI Technical Summary

Problems solved by technology

In the original model control, the stiffness is treated as a fixed number, and the next piece of steel is only adjusted by the learning function, and solidified as a constant, which obviously cannot meet the production conditions and equipment status of the existing rolling mill control plate shape.

Changes in the stiffness value will affect the accuracy of the rolling force setting, which in turn will affect the bending force of the stand before the steel is bitten, resulting in very poor shape control

Especially when the stiffness deviation value between adjacent stands is large, the probability of unqualified crown and wave shape performance is greatly increased, and the rolling risk is increased. The probability of rolling off at the end of rolling, and the coiling shape will also be affected at the same time, and external defects such as poor coil shape, tower shape, and overflow are prone to occur. In addition, if the wave shape of the edge is not good, it is easy to appear curling in the coiling guide , defective products

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