Method for controlling micro-medium wave rolling of hot-rolled strip steel at high precision

Abstract

The invention discloses a method for controlling micro-medium wave rolling of hot-rolled strip steel at high precision. Under the condition that the change factor of the coiling tension and the cooling rate is considered, according to different rolling process states where the strip steel is located, in combination with the real-time speed and the real-time temperature, the full-length flatness target value of the strip steel is subjected to real-time dynamic compensation control, the micro-medium wave control precision of the full-length strip steel is improved, and micro-medium wave rollingof the strip steel is controlled at high precision. According to a finish-rolled plate shape control model established with the method, under the condition that the change factor of the coiling tension and the cooling rate is considered, according to the different rolling process states where the strip steel is located, in combination with the real-time speed and the real-time temperature, the full-length target flatness of the strip steel is subjected to dynamic compensation correction, the full-length plate type of the strip steel is dynamically controlled, the full-length plate shape precision of the strip steel is greatly improved, and micro-medium wave rolling of the strip steel is controlled at high precision. The method is high in precision, free of cost and suitable for rolling control of the strip steel of various specifications and varieties.

Description

technical field [0001] The invention belongs to the technical field of rolling process automatic control, in particular to a method for high-precision control of micro-wave rolling of hot-rolled strip steel, which is suitable for process control of the shape quality of hot-rolled strip steel products. Background technique [0002] Micro-wave rolling is a control method to compensate the flatness of the strip steel by using micro-wave rolling control to offset the poor shape of the rolled strip due to uneven cooling. Flatness is an important quality index of hot-rolled strip products. Poor plate shape refers to the wave or buckling of the strip steel due to the uneven distribution of internal residual stress during the production process. Causes of poor shape include non-uniform plastic deformation, phase transformation, or temperature distribution along the width, length, or thickness of the strip. That is, non-uniform temperature, stress and phase transformation changes w...

AI Technical Summary

Problems solved by technology

[0008] 2) After the coil bites the steel, it can be seen from the flatness value actually detected by the flatness meter that under the action of the coiling tension, the wave shape of the strip formed by the micro wave is obviously reduced, resulting in the measured flatness The difference between the straightness and the target flatness increases significantly, resulting in a significant increase in the bending force in the flatness feedback control of the finish rolling

[0013] The above-mentioned 13 patents all propose to use micro-medium wave control to solve the problem of poor strip shape caused by uneven cooling after rolling, but the existing micro-medium wave rolling control method with a fixed flatness target value, None of them took into account the influence of cooling rate and coiling tension factors on the internal stress of the strip during rolling

As a result, there is a big difference between the wave shape of the head and the tail of the strip after rolling, and the compensation effect of the micro wave cannot be well played.

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