Hot rolled strip steel load distribution method giving consideration to rolling energy consumption and good strip shape
A load distribution, hot-rolled strip technology, applied in the field of control, can solve problems such as long calculation time, unfavorable shape control accuracy and rolling stability, difficulty in meeting real-time requirements, etc.
Inactive Publication Date: 2015-11-04
BAOSHAN IRON & STEEL CO LTD
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Problems solved by technology
Its shortcomings are: first, the calculation time is long, and it is difficult to meet the "real-time" requirements of online calculation; second, the distribution results fluctuate greatly during rolling with the same specification, which is not conducive to the shape control of products in the batch strip production process Precision and Rolling Stability
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[0173] Select a typical carbon steel as an example, the steel type is Q235B, the strip width is 1244mm, and the intermediate billet thickness h 0 is 42.6mm, the final rolling target thickness h n is 3.38mm, the target crown is 40um, and the number n of finishing stands is 7.
[0174] Selection of model parameters in formula (3): a=40, b=1.86.
[0175] The multi-objective optimization model shown in formula (5) is carried out on the carbon steel, and the non-dominated sorting genetic algorithm (NSGA-Ⅱ) of the elitist strategy is used to solve it.
[0176] In the NSGA-II algorithm, the number of populations is 100, and the maximum number of iterations is 40. After 40 iterative calculations, the Pareto optimal solution set of the strip finish rolling load distribution can be obtained, Figure 4 is the change of the objective function with the number of iterations.
[0177] It can be seen from the figure that after 20 iterations, the two objective functions begin to stabilize....
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The invention discloses a hot rolled strip steel load distribution method giving consideration to rolling energy consumption and good strip shape, and belongs to the fieldof control. The hot rolled strip steel load distribution method comprises the following steps: step I, carrying out off-line optimization on finish rolling load distribution coefficients; step II, carrying out off-line decision making on finish rolling load distribution coefficients; and step III, carrying out distribution computation and online control on rolling thickness for finish rolling of each rack strip steel. According to the hot rolled strip steel load distribution method, off-line optimization and online control are combined; an intelligent optimization method is utilized to carry out off-line optimization to obtain load distribution coefficients of typical strip steel stratification; by utilizing a rolling force mode load distribution coefficient method, online computation is carried out and real-time online control is realized; when the intelligent optimization method is adopted to determine finish rolling load distribution coefficients off-line, the rolling energy consumption and the good strip shape for finish-rolling strip steel are taken into consideration; and whiledefects in a method based on artificial experience are overcome, the purpose of improving strip shape control precision and rolling stability of the finish-rolling strip steel is achieved. The hot rolled strip steel load distribution method can be widely applied to thefields ofproduction process control of strip steel of a hot continuous rolling mill, and the finish-rolling strip steel product quality control.
Description
technical field [0001] The invention belongs to the field of control, in particular to a control method used in the production process of strip steel in a hot continuous rolling mill. Background technique [0002] In steel rolling production, the billet is rolled through several stands (also called "passes" in the industry) to produce plastic deformation, and finally rolled out products that meet the specifications. This series of rolling processes is carried out according to the production process regulations set in advance before the billet enters the rolling mill, which is an important work for the continuous rolling of strip steel. Among them, load distribution is the premise and basis of setting calculation, and it is the central link of setting calculation. [0003] The load distribution of finish rolling refers to the distribution system of the thickness of each stand of the finish rolling strip steel. It is the key technology for the production process control of ho...
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IPC IPC(8): B21B37/28B21B37/16B21B37/58
Inventor 李维刚田勇陈龙夫朱海华
Owner BAOSHAN IRON & STEEL CO LTD
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