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数控机床热误差测量及补偿研究的开题报告 Title:ResearchonThermalErrorMeasurementandCompensationofCNCMachineTools 1.Introduction Inrecentyears,withthecontinuousdevelopmentofCNCmachinetools,thedemandforprecisionandefficiencyhasbecomehigherandhigher.However,asthemachinetooloperatescontinuously,temperaturechangesinthemachinetoolanditsenvironmentwillleadtothermaldeformationandthermalerror,whichwillsignificantlyaffectthemachiningaccuracyofthemachinetool.Therefore,itisnecessarytostudyandcompensateforthethermalerrorofCNCmachinetools. 2.LiteratureReview ThermalerrorisacriticalfactorthataffectsthemachiningaccuracyofCNCmachinetools.Manyscholarshavestudiedthermalerrorcompensationmethodsandhaveachievedgoodresults.Thetraditionalmethodofthermalerrorcompensationisbasedonthemeasurementoftemperaturechangesonthemachinetoolandenvironment,andmathematicalmodelsareusedtocompensatetheerror.Somestudieshaveproposedusingsensorstomeasurethetemperaturechangesofthemachinetoolandenvironmentinreal-timeandaddingcorrectionvaluestothecontrollertocompensateforthethermalerror.Inaddition,somescholarshaveproposedusingadaptivecontrolalgorithmstoadjustthecuttingparametersduringmachining. 3.ResearchObjectives TheresearchaimstomeasurethethermalerrorofCNCmachinetoolsandstudythecompensationmethods.Thespecificobjectivesare: -TodesignandimplementatemperaturemeasurementsystemthatcanmeasurethetemperaturechangesoftheCNCmachinetoolandthesurroundingenvironmentinreal-time. -Tobuildamathematicalmodelthatcandescribethethermaldeformationofthemachinetoolunderdifferenttemperatureconditions. -Toproposeandimplementacompensationmethodbasedonthemeasuredtemperaturechangesandtheestablishedmathematicalmodel. -Totesttheeffectivenessofthecompensationmethodandverifytheimprovementinmachiningaccuracy. 4.Methodology Theresearchwillbeconductedinthreephases: Phase1:Designandimplementationofatemperaturemeasurementsystem.Thesystemwillcomprisethermocouplesandtemperaturesensorslocatedatkeypointsofthemachinetoolanditsenvironmenttomeasurethetemperaturechangesinrea