A method for dynamically changing gauges of cold-rolled thin strips

Abstract

The invention relates to a dynamic specification change method for a cold-rolled thin strip and belongs to the technical field of cold-rolled sheet strips. According to the technical purpose, the dynamic specification change method for the cold-rolled thin strip is provided. The dynamic specification change method includes the following steps that when a weld joint reaches a last weld joint detectors, first-time dynamic specification change is executed, and the dynamic specification change parameter of the weld joint is the dynamic specification change parameter that the rolling thickness of the weld joint is larger than that of the thin strip by 0.1 mm; and when the position of the weld joint is out of a third rack, second-time dynamic specification change is executed, and the dynamic specification change parameter of the weld joint is the dynamic specification change parameter of the thin strip. By means of the dynamic specification change method, thickening length of a strip head can be quantitatively controlled, and the defect of a heart-shaped coil of the thin strip is avoided; and meanwhile, manual intervention of people can be reduced, and the thickness control precision is improved. The method is mainly suitable for the production field of cold-rolled thin strips with the thickness being lower than 0.4 mm and especially suitable for cold-rolled thin strips with the thickness being 0.3 mm, applicability is high, and the method can be applied to and popularized in 2030 mm cold rolling and acid rolling combined unit and the same domestic industry.

Description

technical field [0001] The invention relates to a method for dynamically changing specifications of cold-rolled thin strips, which belongs to the technical field of cold-rolled strips. Background technique [0002] Flying gauge change (Flying Gauge Change, FGC) is to change the specifications of the strip steel during the rolling process, that is, to realize dynamic adjustment of parameters such as roll gap, speed, and tension under the condition that the continuous rolling mill does not stop. Changes in specifications such as steel type, thickness, and width of two adjacent coils of strip steel. In the continuous rolling process, when the weld seam of strip steel with different thickness reaches the rolling mill, it is necessary to adopt dynamic variable specification rolling. Control parameter changes to achieve specification transition without stopping the machine. [0003] In recent years, with the development of cold rolling technology, more and more users prefer ultr...

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Problems solved by technology

[0005] When rolling 0.3mm thin strip, its dynamic specification change control flow chart is shown in figure 1 , using conventional dynamic variable specifications can guarantee its normal thickness accuracy, but after the steel coil is coiled, because the specification is too thin, a "heart-shaped" defect occurs when the outer ring of the steel coil is squeezed, resulting in the failure of production in the next process. The customer cannot use it. In actual production, the method of manually lifting the roll gap to increase the thickness of the strip is usually used, but it is not convenient to quantitatively control the length of the thickening. Control the thickness and length of the head

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