Thickness control method for single precision cold-rolled sheet thickness measuring system

Abstract

The invention discloses a thickness control method for a single precision cold-rolled sheet thickness measuring system, and belongs to the field of mechanical automation control. Because a single sheet is short and requires short rolling time, a thickness feedback value acquired by a thickness gauge cannot be used for thickness closed-loop control. A thickness measured value is used for self-learning of a sheet thickness computation model of a process control system, the deformation resistance and a friction coefficient under the actual working condition of a material are corrected, and the thickness control accuracy is improved fundamentally by improving the set computational accuracy of the sheet thickness computation model. By an advanced support vector machine modeling method, the deformation resistance and the friction coefficient of the single sheet are subjected to statistical modeling, and an analytic model and statistical model combined model structure is formed; and a plurality of deformation resistance support vector machines are established according to different cumulative reduction ratios, and a plurality of friction coefficient support vector machines are established according to different rolling linear speeds, so that the action range of each support vector machine is narrowed, the computational accuracy of the model is effectively improved and the thickness control accuracy for single cold-rolled products can be greatly improved.

Description

technical field [0001] The application belongs to the field of mechanical automation control, and in particular relates to a thickness control method of a precision cold-rolled sheet thickness measuring system for a single sheet. Background technique [0002] In the current cold rolling production, tension coil rolling is mostly realized, but for the rolling of special varieties such as titanium alloys, it is difficult to form coils due to the small demand for a single batch, or due to the large deformation resistance and difficulty in bending Rolling, mostly using tension-free single-sheet rolling. [0003] However, single-sheet precision rolling has many technical difficulties: [0004] (1) Single sheet precision rolling has flexible specifications, small batch output, and large uncertainty in incoming material thickness and cross-sectional shape; [0005] (2) Due to the lack of tension in single-sheet cold rolling, the deformation resistance is large, which leads to lar...

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Problems solved by technology

[0014] The key technical problem to be solved by the present invention is to develop a parameter automatic control system based on the combination of analytical model and support vector machine statistical model in view of the problems in the thickness control of single sheet cold rolling that cannot be controlled in real time and the thickness accuracy is difficult to ensure. Plate Thickness Control Method for Learning Function

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