本科毕业论文（20届）变截面汽车板簧轧机的控制系统设计所在学院专业班级自动化学生姓名学号指导教师职称完成日期年月摘要本文介绍了变截面汽车板簧轧机控制系统的组成原理与控制要求，采用了电液伺服控制技术，选用PLC作为控制器，按照给定的控制曲线，以闭环的形式控制轧辐的压下量，从而生产出满足工艺要求的板簧。该轧机具有自动和手动两种工作方式。在自动方式下，由安装在拉拔一侧的旋转编码器检测并确定板簧位置，调用通过参数设置保存在PLC存储器中的对应的压下量，轧机根据该压下量对板簧进行轧制，通过1〜3次轧制，轧制出符合要求的变截面板簧。轧制过程中，使用PLC内置的PID控制器实现对轧制厚度的闭环控制，使轧制精度进一步提高。手动方式下可对轧机进行相应调整。根据板簧轧机控制系统的组成，选择电液伺服阀、液压缸、位置传感器和PLC。该控制系统集机械、液压和计算机控制技术于一体，响应速度快，轧制精度高，信号处理灵活，自动化程度较高，具有很好的应用前景和经济效益。关键词：板簧轧机，控制系统,PLC,PIDAbstractAbstractThispaperintroducedvariablecross-sectionmillcontrolsystemvehiclesbanhuangIthecomposingprincipleandcontrolrequirements,theelectrichydraulicservocontroltechnology,choosePLCascontroller,accordingtothegivencontrolcurvetotheformoftheclosed-loopcontrolrollofreduction,whichproducethebanhuangImeetthetechnologicalrequirements.Thismillpossessesautomaticandmanualtwowaytowork.Inautomaticmode,byinstallingindrawingsideoftherotaryencoderanddetermineleaf-springpositiondetectioninparameterSettingsmediator,invokedthecorrespondingexistingPLCmemoryofreduction,accordingtothepress-downquantityofrollingmillofrolling,throughonleaf-spring1〜3timesrolling,rollingouttomeettherequirementsofvariablecross-sectionleaf-spring.Rollingprocess,USESPLCbuilt-inPIDcontrollertoachievethethicknessoftheclosed-loopcontrol,rollingrollingprecisionfurtherimproveto.Manualmodecanadjustonthemill.AccordingtothecompositionofthemillcontrolsystembanhuangIchoosehydraulicservovalves,electricandhydrauliccylinder,positionsensorandPLC.Thecontrolsystemintegratingmachine,hydraulicandcomputercontroltechnologyinanorganicwhole,fastresponsetime,highprecisionofrolling,signalprocessingflexible,automationdegreeishigher,hastheverygoodapplicationprospectandeconomicbenefits.Keywords:leaf-springmill,controlsystem,PLC,PID目录TOC\o"1-5"\h\zHYPERLINK\l"bookmark10"\o"CurrentDocument"\h摘要IHYPERLINK\l"bookmark13"\o"CurrentDocument"\hABSTRACTIIHYPERLINK\l"bookmark16"\o"CurrentDocument"\h目录IIIHYPERLINK\l"bookmark21"\o"CurrentDocument"\h第一章引言1HYPERLIN