单机架可逆式冷轧机PLC控制策略研究

辽宁科技大学本科生毕业设计（论文）I单机架可逆式冷轧机PLC控制策略研究摘要厚度精度与张力控制是板带产品的两大技术指标。目前随着轧制理论、控制理论和人工智能理论的发展，以及它们在轧制工程中的应用，使得板带产品的厚度精度与张力控制有了很大程度的提高。然而，对单机架可逆式冷带轧机采用专门的控制技术，用以实现对板带材的高精度控制，仍是板厚控制领域研究的热点问题之一。本文在剖析恒昌AGC650程序单机架可逆式冷轧机的基础上，探讨了厚度控制系统的理论与实现，对厚度控制系统及相关理论进行了全面系统的研究，为今后研究更高精度的轧机控制系统提供理论依据。研究了液压压下控制系统的工作方式以及伺服阀线性控制的实现方法，建立了板带轧机液压AGC系统的动态模型。所建立动态模型简单且便于分析轧制过程中各种因素对最后轧制精度的影响。通过对单机架可逆式冷轧机PLC的研究，来进一步实现对板钢AGC的控制。最后，本文深入研究了轧辊偏心对板带材厚度的影响，论述了轧辊偏心的两种基本类型，阐明了轧辊偏心的特点、产生原因、偏心测量，指出了轧辊偏心对板厚的影响。深入研究了一种新的轧辊偏心补偿方案，由于通过数字程序直接实现，避免了传统的偏心补偿方案的缺陷。关键词：可逆冷轧机；板厚控制；液压AGC；PLC研究；轧辊偏心辽宁科技大学本科生毕业设计（论文）IISinglestandreversingcoldmillPLCcontrolstrategyresearchAbstractThicknessaccuracyandtensioncontrolisaplatewithtwomajortechnicalindicatorsoftheproduct.Nowastherollingtheory,controltheoryandthedevelopmentofthetheoryofartificialintelligence,aswellastheirapplicationintheengineeringofrolling,thethicknessaccuracyofstripproductsandthetensioncontrolhasimprovedgreatly.,however,thesinglestandreversiblecoldstriprollingusingspecialcontroltechnology,torealizethehighaccuracycontrolofplatestrip,isstillthethicknesscontrolfieldresearchoneofthehotissues.BasedontheanalysisofHengChangAGC650program,onthebasisofsinglestandreversiblecoldrollingmill,discussesthetheoryandrealizationofthethicknesscontrolsystem,thicknesscontrolsystemandtherelatedtheoryforthecomprehensivesystemofresearch,forthefuturestudyprovidetheoreticalbasisforhigheraccuracyofrollingmillcontrolsystem.TheworkingsofahydraulicpressurecontrolsystemisstudiedandtherealizationmethodoflinearservovalvecontrolboardisestablishedwithdynamicmodelofrollingmillhydraulicAGCsystem.Theestablisheddynamicmodelissimpleandconvenienttoanalysisintheprocessofrollingtheinfluenceofvariousfactorsonthefinalrollingprecision.PLCbasedonsinglestandreversingcoldrollingmilloftheresearch,tofurtherrealizetheAGCcontrolplatesteel.Finally,thispaperdeeplystudiedtherolleccentricityonthicknessofplatestripandrolleccentricityisdiscussed,andthetwobasictypes,causes,illustratesthecharacteristicsofrolleccentricity,eccentricitysurveying,pointsouttheinfluenceofrolleccentricityonthickness.Studyanewkindofrolleccentricitycompensationscheme,duetothedirectimplementationbydigitalprograms,toavoidthedefectsofthetraditionaleccentriccompensationscheme.Keywords:reversiblecoldrollingmill;Thicknesscontrol;HydraulicAGC;ThePLCresearch;Rolleccentricity辽宁科技大学本科生毕业设计（论文）III目录摘要...............................................................................................................................................................IAbstract.......................................................................................................................................................II1绪论.........................................................................................................................................................11.1选题的背景和意义......................................................................................................................11.1.1选题的背景...........................................................................................................................11.1.2选题的意义...........................................................................................................................11.2板带轧机厚度控制发展概况...................................................................................................11.3PLC软件简介..............................................................................................................................31.3.1PLC的产生............................................................................................................................31.3.2PLC定义与分类....................................................................................................................31.3.3PLC特点................................................................................................................................41.4本章小结.....................................................................................................................................42冷轧机厚度控制原理及模型分析..........................................................................................52.1冷轧机厚度控制系统概述........................................................................................................52.2冷轧机厚度控制的工艺基础...................................................................................................52.2.1影响轧件厚度的因素............................................................................................................52.2.2弹跳方程...............................................................................................................................62.2.3轧机等效纵向刚度...............................................................................................................72.3本章小结........................................................................................................................................83恒昌AGC650程序实例研究...................................................................................................