A Feed-forward Control Method for Strip Head and Tail Edge Drop

Abstract

The invention discloses a feedforward control method for edge drop of a head part and a tail part of strip steel. The feedforward control method comprises the following steps: dividing the head part and the tail part of the strip steel into a plurality of segments along the direction of travel of the strip steel; for each of the segments, performing the following steps: getting n points from the edge part to the center of the strip steel and in the width direction of the strip steel; collecting edge drop values, at the n points, of the incoming strip steel; determining a play value, which corresponds to each point, of a working roll through the following model formula: DeltaWRSi=-ki{[(EC-Ei)-alpha]*beta+m}; calculating the sum DeltaWRS of play values which correspond to the n points; executing the DeltaWRS so as to perform edge drop control. According to the feedforward control method for the edge drop of the head part and the tail part of the strip steel, accurate control can be performed on the edge drop of the head part and the tail part of the strip steel.

Description

technical field [0001] The invention relates to a control method in the rolling process of strip steel, in particular to a control method for edge drop of strip steel. Background technique [0002] The edge drop of cold-rolled strip (EdgeDrop, referred to as edge drop, also known as edge thinning) is an important parameter of dimensional accuracy index. The traditional definition of edge drop is the difference between the thickness tA at the position 100mm from the edge of the strip minus the thickness tB at the position 15mm from the edge of the strip. [0003] However, with the continuous improvement of users' requirements for product quality, the traditional edge drop definition has been difficult to meet the requirements. It often happens that when the control level of the traditional edge drop fully meets the control requirements of the unit, it still cannot meet the user's requirements for the shape of the strip section. . Therefore, at present, when producing cold-r...

AI Technical Summary

Problems solved by technology

[0008] However, the existing feedback control method has a big problem in the control of strip edge drop: at the head and tail parts of the strip, because this part belongs to the steel throwing process during hot rolling production, the corresponding hot rolling incoming material There are often large fluctuations in the change of the edge drop. For this part of the corresponding section, after the edge drop data detection at the exit of the rolling mill is used for feedback control, there will often be obvious hysteresis and non-correspondence

That is to say, the control effect of the strip head and tail section is not good by using the existing feedback control method

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