Second-flow based self-adaptive method for controlling thickness of plate of single-stand reversing rolling mill

Abstract

The invention discloses a second-flow based self-adaptive method for controlling the thickness of the plate of a single-stand reversing rolling mill, comprising the following steps: measuring the thickness of an inlet of a workpiece to be rolled to obtain the thickness of an inlet strip steel of the roller gap, measuring the speed of the inlet strip steel and the speed of an outlet strip steel of the workpiece to be rolled, calculating to obtain an estimated value of the thickness of the strip steel, carrying out feedback control by adopting the traditional second-flow control method, identifying parameters at the same time to obtain the estimated value hat(c)1 of the parameter cp / cm, the estimated value hat(c)2 of the eccentricity coefficient vector c2 which corresponds to each roller and the estimated value hat(c)3 of the steady-state setting error a, and calculating according to formulas after the parameter identification is stable to obtain an actual roller gap setting value. The thickness of the strip steel is calculated on the basis of the second flow, the dependence on an outlet thickness tester is avoided, the process parameters are estimated by adopting the online identification method, the process parameters and the eccentricity signal are estimated simultaneously, and the feedforward control precision, the parameter estimation precision and the thickness control effect are improved.

Description

technical field [0001] The invention relates to an automatic plate thickness control method for a single stand rolling mill for response control of workpiece plate thickness. Background technique [0002] Such as figure 1 with figure 2 As shown, the figure shows the conventional method of control used in a conventional hydrodynamically loaded rolling mill. The working process of the single-stand reversible rolling mill is as follows: the workpiece to be rolled passes through the uncoiler 1, and after passing through the guide roll 2, it is rolled between the upper work roll 6 and the lower work roll 7, and the rolled workpiece passes through the guide roll 11 , is wound by the coiler 12. [0003] The second flow control principle is as follows: the actual plate thickness obtained by the rolling mill entrance thickness gauge 3 is passed through the delay module 13 to obtain the entrance thickness value at the rolling moment. According to the principle of constant flow pe...

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Problems solved by technology

[0004] The advantage of this method is: rapid response to steady-state errors; the disadvantage is that the proportional integral control gain needs to be adjusted, and it does not reflect the compensation for the entrance thickness and roll eccentricity, resulting in the finished product being susceptible to damage when a single second flow control is used. Some effects of high-frequency fluctuations in materials

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