Extension coefficient and plate shape integrated control method in steel strip flattening process

Abstract

The invention discloses a belt steel flattening elongation and slab-shaped complex control method, which is characterized by the following: the invention can choose draught pressure mode by comparing draught pressure adjusting elongation algebraic system and tension adjusting elongation algebraic system or use tension mode to control elongation, which can control rolling process of planisher according to set point of every processing parameter and relevant on-line measured value; the tension is controlled in draught pressure control mode, when the draught pressure accumulation regulating variable is over finite limit and the draught pressure keeps constant; the draught pressure is adjusted in tension control mode, when the tension accumulation regulating variable is over finite limit and the tension keeps constant; the curve roll force is adjusted when adjusting draught pressure.

Description

technical field [0001] The invention relates to a steel production method, in particular to a method for controlling flat elongation and plate shape of strip steel. Background technique [0002] Cold-rolled leveling is to roll the strip steel after recrystallization annealing with a small plastic deformation (elongation is generally 0.2% to 3%) to eliminate the yield platform, control the shape of the plate, and obtain the required surface morphology rolling process. Regardless of the traditional or modern cold rolling process, leveling is one of the essential production links. Since tempering is the last process that determines the shape and mechanical properties of the finished strip, the elongation and shape control of the tempering machine is of great significance for improving the quality of cold-rolled strip. [0003] At present, for most of the hot-dip galvanizing units and the tempering mills in some continuous annealing units, there is no flatness closed-loop cont...

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Problems solved by technology

[0006] 1. For the system that only adopts the rolling pressure method, for strip steel with thin thickness and high strength grade, since the elongation is not sensitive to the rolling pressure, when the elongation deviation is relatively large, although the rolling pressure adjustment is large, the elongation The rate deviation may not be completely eliminated, thus affecting the elongation rate control accuracy

[0007] 2. In the system that adopts the rolling pressure mode and the tension mode at the same time, the selection method of the control mode is too simple, only considering the strip thickness factor, and cannot fully reflect the sensitivity of the elongation rate to the rolling pressure and tension

For example, for a high-strength steel strip, even if it is relatively thick, its elongation may be much less sensitive to rolling pressure than to tension. If it is too large, it will have an adverse effect on the smooth exit plate shape and the stable operation of the system

[0008] 3. Even if the elongation control method is selected reasonably, and the elongation is only controlled by adjusting the rolling pressure or tension, in some cases (such as rolling pressure and tension preset errors are large), there may still be If the cumulative adjustment of rolling pressure or tension is too large, it will also have a negative impact on the exit shape and the stable operation of the system

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