A method for controlling the thickness of flexible rolling of non-ferrous metals

Abstract

The invention relates to a flexible rolling thickness control method for non-ferrous metal, and belongs to the technical field of automatic control over plate strip rolling. The method is characterized by comprising the implementation steps of (1) collecting the rolling force of a rolled piece and a corresponding rolling speed during rolling; (2) determining the overall average value of the rolling force of a supporting roller which rotates for a circle, wherein the average value is shown in the description; (3) determining the thickness h of strip steel in a rack; (4) conducting thickness control according to length tracing of a plate strip sample to determine the sample length Li of each pass; (5) utilizing a previous pass thickness curve for determining a roller gap adjusting curve in the subsequent pass rolling process; (6) dynamically adjusting thickness increment change and the pressing efficiency of a rolling machine by considering of various parameters in the rolling process, ignoring the speed fluctuation and the width change in the finish rolling process, and determining the adjustment amount of an AGC system; (7) determining the final roller gap adjustment amount of theAGC system. The method has the advantages that the problem that the thicknesses of small blank metal plate strips with various specifications cannot be monitored is solved, and the thickness control precision and finished product quality of the small blank metal plate strips are improved.

Description

technical field [0001] The invention belongs to the technical field of automatic control of plate and strip rolling, and in particular relates to a thickness control method for flexible rolling of nonferrous metals. Background technique [0002] In the strip rolling process, including the rolling process of steel strip, aluminum strip, copper strip, etc., the most commonly used thickness control method is to measure the actual thickness of the strip through the thickness gauge installed at the exit of the rack, and then through Adjust the roll gap of the rolling mill to feedback control the thickness of the strip. This thickness control method is called monitoring AGC (Automatic Gage Control). [0003] The thickness gauge that monitors AGC is generally installed far away from the roll gap that directly produces thickness changes. For example, the exit thickness gauge of a strip hot rolling mill is required to be installed about 1000-3000 mm away from the center line of the w...

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Problems solved by technology

[0003] The thickness gauge that monitors AGC is generally installed far away from the roll gap that directly produces thickness changes. For example, the exit thickness gauge of a strip hot rolling mill is required to be installed about 1000-3000 mm away from the center line of the work roll of the last stand. The disadvantage of this installation is that for non-ferrous metals with multiple specifications and small blanks, the length of the strip is limited, and the thickness of the plate cannot be measured by a thickness gauge during the rolling process, and the thickness change value of the plate cannot be detected, that is, it cannot be obtained. The fluctuation of the thickness of the strip actually rolled leads to the inability to effectively control the thickness of the final strip, which reduces the yield of the strip

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