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外文翻译---ALGORYTHMS控制速度和斯特雷奇 英文.pdf

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外文翻译---ALGORYTHMS控制速度和斯特雷奇 英文.pdf

1ALGORYTHMSFORSPEEDANDSTRECHCONTROLOFTHEMAINDRIVESOFANSTRECHREDUCINGTUBEMILLDorianMACREASCIPROLAMSA,Negustori23,Bucharest,Romaniadorian.macreaiprolam.roCostinCEPISCAPolitehnicaUniversity,Spl.Indep.313,Bucharest,RomaniaAbstract.Thispapershowsthedrivesolution,thespeedreferencescalculationandtheautomaticcontrolofallspeedsrangefortheassemblyofthe24standsbelongingtoastretchreducingmillforseamlesspipes.Thecorrelationbetweenthespeedcontrolandthestretchingcontroloftherolledpipeisalsoshown.TheexperimentalresultsarerealdataassociatedtothemostrecentprojectthathasbeenexecutedataseamlesspipeplantinChina.1IntroductionTheconceptofcommondrivesofthestandsusingdistributionanddifferentialgearboxesrepresentsaflexibilitylimitationoftheperformancesofthemillbutusingitwecansensiblyreducethecostsofthedrives1,2.Therefore,whenwearedesigningrollingmillsofthistype,wehavetostudycarefullythenecessityandtheutilityofchoosingindividualdrivesforeachstandorcommondrives3.Ifweareusingacommonreducerdrivenusingmainandoverlappingdrivestherotatingspeedratiosarechangingsimultaneouslyatallstandsbycontroloftherotatingspeedatbothoroneofthetwomotorsandmaintainingtheratiosfortherotatingspeedsoftherollingstandsasbeenestablishedbydesigningofthegears.Thus,inthisdrivesystemwecanchangeonlythespeedaverageorthestretchingaverage,butnotthedistributionofthedeformationvaluesintheindividualsequenceofthestands4,5.Ifwemaygiveuptheadvantagesoftheindividualspeedcontrolonthepipedeformationandifweexceptalargerslippingbetweentherollsandtherolledmaterialacurrentstatusateasierrollingprogramswecouldacceptacommondrivewithdistributionanddifferentialgears6,7.2Electromechanicaldrivesolution2.1.SpeedcontrolThe4motordriveconsistsoftwodrivegroupswhicharemechanicallyseparatedfromoneanotherand,therefore,alloweffectivecropendcontrolCECevenwithclosesequencesoftubes.Forthispurpose,theentrymillstandgroupfeaturesexceptionallyhighgearratiostoobtainparticularlylargeelongationsFigure1.Therollspeedsforstandpositioniarecalculatedas,Intheentrysidedrivegroup2DistributionDifferentialGearNo.2RollrotatingspeedSRMRollingstandsDistributionDifferentialGearNo.1n1frommotor1n2frommotor2tostandn1n2Motor1Motor2Motor3Motor4CommonvariationofrotatingspeedratiosDD1MD1MD2DD2Figure1SchematicforSRMwithCommonDrivewithDistributionandDifferentialGears1121IGRDDISDDiIGRSDDIGRMDISMDiIGRSMDispeedRoll1Withrespecttothedrivegroupontherunoutside2222IGRDDISDDiIGRSDDIGRMDISMDiIGRSMDispeedRoll2Thebasisspeedcurveischaracterizedbyhighgearratiosintheentrydrivegrouptoenablepositivedifferentialgearactionalsointhisarea,i.e.identicaldirectionofrotationofbothbasicanddifferentialdrives.Duringthesteadystatephaseoftherollingprocess,thebasicdrivesofthissystemrunatidenticalspeedswhilethedifferentialdriveunitsoperateatexactlysynchronizedspeeds.Thespeedsarerelatedbythefollowingterm22221IGRDDISDDIKDIGRMDISMDIKMIGRMDISDD32211IGRMDISMDICFIGRMDISMD4wherebyIKMandIKDareconstants.Themotorsaresynchronizedautomaticallyinthebasicautomationsystem.3SpeedrangeforrollingprogramBasicspeedcurveCECreserveFigure2Speeddiagramsofthetandemdifferentialdrive2.2StrechcontrolThemotorspeedsatchangesinelongationarecalculatedwiththerotationalspeedvaluesresultingfromthecalculationofthechangesinspeed.Thismethodensuresthattheoperatorcaneffectachangeinelongationbymeansofachangeinspeed,ifnecessary,ifmotorspeedlimitsarereachedwithnochangeinspeed.Oneinputvalueisusedforthechangeinelongation.Inputrange100...100Standard0inrollingprogramCalculationConversionoftheenteredvalueP100/100/1maxPPPS5withPmaxasinternallimitingvalue,e.g.20intheactualproject.ThefollowingcalculationresultsinapivotingofthespeeddiagramwiththepivotpointIPSPPFigure2.OnestandpositionisdefinedasthepivotpointIPSPPIPSI.Thishastheeffectthattheentryspeedandthusthethroughputofmaterialremainmoreorlessconstant.Eachgearboxisassignedtoonemotor.Acharacteristicvaluewhichisdeterminedtogetherwiththerollingprogram,determinesthegearstage0or1.ThecorrespondinggearratiosareindicatedintheTable1.4FurthercalculationofnewmotorspeedsIGRMD11orgearratiooftheswitchingstepchosen.ThesameistobeappliedforIGRMD2,IGRDD1andIGRDD2.ForcalculationreasonswedefinethevariablesXIKMandYIKD.Table1GearratioIGRMD1IGRDD1IGRMD2IGRDD2Gearstage0111111111Ifonlythestandgroupontheinletsideisoccupiedbyrollstandsandthedrivesontherunoutsidearenotusedtodriveguidestandsetc.thefollowingapplies2112IGRMDIGRMDISMDISMDandX0Y16Finalcalculationofnewmotorspeed111111IGRDDIPSFIGRSDDICFYRAPIPSIIGRSSDDICFZMWUAVSMDIGSRSDDIGRDIGRSDIGRSMIGRDDISDDIGRMDISMDUAVOSDD−−71111111IGRMDMDIGRSDDIGRSIGRDDOSDDISDDIGRMDISMDOSMD−8211112IGRDDICFIGRMDOSMDXYIGRDDISDDYRAPOSDD−92112IGRMDICFIGRMDOSMDOSMD10Aftereverycalculationofamotorspeed,limitvaluesarecheckedandcorrectedaccordingly.ThechangeininletandoutletspeedcanbecalculatedwiththebasicequationIOSAJGIS11withISInletoroutletspeedafterchangeinelongationm/sGGradientrelationshipofinletoroutletspeedm/s/inRollingprogramAJAdjustedinputvaluePIOSInletoroutletspeedatdefaultsettingsofthemotorsm/s.Ifonlythestandgroupontheinletsideisoccupiedbyrollstandsandthedrivesontherunoutsidearenotusedtodriveguidestands,thefollowingappliesOSDD20,OSMD20.

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