Deviation value control method for cold rolling hot galvanizing coating uniformity

Abstract

The invention provides a deviation value control method for cold rolling hot galvanizing coating uniformity. The method comprises the steps of: 1) establishing an influence model of the knife lip opening degree on coating thickness; 2) establishing an influence efficiency function matrix determining the influence weight of each air knife lip servo motor adjustment amount on each coating; 3) solving a motor adjustment amount according to a quadratic error function minimum principle; and 4) considering the actual application features in terms of correcting the quadratic error function, when the galvanizing thickness measured value of a point deviates from most measuring points, in order to avoid the interference of an extreme value on the coating control of other areas, adding a filtering function in an error function, thus finally obtaining a needed air knife lip opening degree. The invention provides a new galvanized layer thickness calculation model suitable for industrial application, introduces the influence efficiency function matrix, enhances the coating uniformity control accuracy, and simultaneously adds the cost function and the filtering function to improve the coating error function accuracy, thereby enhancing the coating uniformity calculation accuracy, and improving the surface quality of a galvanized product.

Description

technical field [0001] The invention belongs to the technical field of automatic control of galvanizing process, in particular to galvanizing process and coating control technology of cold-rolled hot-dip galvanizing line. Background technique [0002] An important technical index to measure the quality of galvanized products is the coating thickness and its uniformity. If the coating is too thick, it will not only waste raw materials such as zinc ingots, but also affect the performance of the product such as spot weldability, adhesion, and powdering resistance of the coating; while the coating is too thin, it will affect the corrosion resistance of the product. will accept. Therefore, the control level of the coating uniformity system will directly affect the product quality, product cost and market competitiveness of the hot-dip galvanized sheet. This puts forward very high technical requirements and control difficulties for the coating uniformity control technology. To o...

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