Control method of edge portion strip shape of cold rolling strip steel

Abstract

The invention relates to a rolling method of cold rolling strip steel, in particular to a control method of edge portion strip shape of thin strip steel rolled by a cold continuous rolling mill or a two-stand temper mill. In a strip shape feedback control system centered on a last stand and on the basis of fundamental strip shape control function of major control for conventional edge waves and center waves, the method identifies the state of the edge portion strip shape of the strip steel based on the difference between the actual measured strip shape of strip steel edge portion together with the adjacent areas at the exit of last stand and an objective strip shape, and adjusts the corresponding strip shape executive mechanisms of the last stand and the rest stands according to the state of the edge portion strip shape to realize effective control for the edge portion strip shape of the strip steel, such as small edge waves and small side waves, thereby further improving the quality of the strip steel after cold rolling or temper rolling.

Description

technical field [0001] The invention relates to a rolling method of cold-rolled strip steel, in particular to a method for controlling the edge shape of thin strip steel rolled by a cold tandem rolling mill or a double-stand tempering mill. Background technique [0002] When cold-rolling or flattening thin strip steel (especially ultra-thin strip steel with a thickness of ≤0.3mm), when the local deformation of one or both sides of the strip steel is larger than that of the adjacent area of ​​the edge, the width of the strip edge is relatively large. In a narrow range, local open edge waves with relatively small wave height and wave distance are likely to appear, that is, small edge waves, also known as broken edge waves, etc.; When it is large, local closed edge waves with relatively small wave height and wave distance are likely to appear in the narrow range of width near the edge of the strip, that is, small partial waves. In this paper, small side waves and small sid...

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Problems solved by technology

[0005] The above method has the following shortcomings: (1) The shape deviation obtained by directly subtracting the target shape value from the measured shape value of the edge of the strip cannot accurately reflect the shape state of the edge of the strip, especially the Whether there is a small deviation wave in the area near the edge

(2) Since it takes a long time for the strip steel in the upstream frame to run to the shape meter at the exit of the last frame, the delay of the shape detection is correspondingly long, and the response speed of the axial movement of the roll is slow, and the edge shape control period only longer

Only subtracting the target shape value from the instantaneous measured edge shape value at a certain moment in the current control cycle cannot fully reflect the change of the strip edge shape along the length direction in the same control cycle

(3) Although the response speed of work roll bending and intermediate roll bending is much faster than the response speed of roll axial movement, both adopt the same control cycle, which cannot take advantage of the rapid response of bending control

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