System Modeling And Integration Of Strip Tandem Mill's Semi-physical Simulation Platform

To improve our cold-rolled strip production technology in internationalcompetitiveness, the construction of proprietary modern automatic cold tandem mill,which can also meet the need of packaging and manufacturing industry during economicdeveloping, is the common goal of domestic steel rolling industry.Shape and thickness accuracy is the important standard of the strip's quality. Rollingmill system as a complex multivariate, nonlinear and close coupling system, its dynamicadjustment process and the change of the parameters all have some influences on thequality of the target shape and thickness. However, the research of domestic mill system,often confines to individual, local or static characteristics analysis. We don't have theideal research results about the shape and thickness'comprehensive adjustment during thecold rolling process. This paper is based on this point. It discuss that in the light of thepractical application of cold rolling mill physical model, selecting the mechanical,electrical, hydraulic equipment and control system mathematical model, according to therelationship between the physical connection of practical situation cold rolling equipmentand the parameters of rolling theory, how to construct the mechanical, electrical, hydraulicintegration semi-physical simulation platform of cold rolling mill ,than achieve the shapeand thickness dynamic process simulation of the whole process of cold rolling.With increasingly matures computer technology, a variety of industrial application ofintelligent optimization algorithms can be realized and continue deep into the productionand in all areas of life. In cold tandem rolling field, the practical rolling schedule isbehindhand, and can not adapt to the new rolling technology and new materials rollingdemand. This paper expounds that if we apply the hybrid intelligent optimizationalgorithms to rolling schedule, while ensuring the quality of the target shape and thickness,the total energy consumption will be reduced and all the rolling racks will give full play totheir roles during the deformation process. Comparing the optimization results of thehybrid intelligent optimization algorithm in 1220 mm cold tandem mill to practicalprocedures, the total energy consumption reduces by 20% or so. Now this hybridintelligence optimization algorithm has already been applied to a factory in 1100 two-stand reversing HC rolling mill's rolling technology parameters research system.In the light of the adjustment process of the practical 1420 mm five-stand coldtandem mill's thickness, a mechanical, electrical, hydraulic integration simulation modelis set up in simulink. When the roughing is being simulated, it controls the incrementalthickness by the expansion logistics of AGC; when the finishing is being simulated, itarchives the thickness` dynamic adjustment with the A of AGC. Simulation resultsconform to the law of the analytical model's calculated results, so this platform can beused to simulate the process of cold tandem rolling.Influence function is used to the shape analysis. In this paper, influence functionmethod is used to set up the online shape database. By neural network's approximationfunction, the shape online model is set up. Meanwhile, in accordance with shape andthickness relation, by the given increase adjustment relationship of comprehensive control,then a online neural network controller is established in the simulink simulation platform,so that the dynamic process simulation of the shape and thickness's comprehensiveadjustment can be achieved. The simulation results are consistent with the calculationresults, the platform can be used to simulate the comprehensive adjustment process of thecold tandem roling's shape and thickness.We validated the model of rolling rigidity, the model of synthesize adjustment ofshape and thickness, the model of hydraulic servo system and the model of drive motor'sspeed in 300mm rolling mill. The experimental results conform to simulation results, itshowed that the virtual rolling mill which is established by these model can be used tosimulate cold tandem rolling process.