Analysis of thermal errors in a high-speed micro-milling spindle

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1、ARTICLEINPRESSInternationalJournalofMachineTools&Manufacture50(2010)386–393ContentslistsavailableatScienceDirectInternationalJournalofMachineTools&Manufacturejournalhomepage:www.elsevier.com/locate/ijmactoolAnalysisofthermalerrorsinahigh-speedmicro-milli

2、ngspindlenE.Creighton,A.Honegger,A.Tulsian,D.MukhopadhyayMicrolutionInc.,4038NNashvilleAve,Chicago,IL60634,USAarticleinfoabstractArticlehistory:ThermallyinducederrorsaccountforthemajorityoffabricationaccuracylossinanuncompensatedReceived16March2009machin

3、etool.Thisissueisparticularlyrelevantinthemicro-machiningarenaduetothecomparableReceivedinrevisedformsizeofthermalerrorsandthecharacteristicdimensionsofthepartsunderfabrication.Aspindleofa1November2009micro-millingmachinetoolisoneofthemainsourcesoftherma

4、lerrors.OthersourcesofthermalerrorsAccepted2November2009includedriveelementslikelinearmotorsandbearings,themachiningprocessitselfandexternalAvailableonline11November2009thermalinfluencessuchasvariationinambienttemperature.Thebasicstrategyforalleviatingthe

5、Keywords:magnitudeofthesethermalerrorscanbeachievedbythermaldesensitization,controlandMicro-millingcompensationwithinthemachinetool.ThermalcompensationThispaperdescribesaspindlegrowthcompensationschemethataimstowardsreducingitsHigh-speedspindlethermally-

6、inducedmachiningerrors.TheimplementationofthisschemeissimpleinnatureanditcanMicro-machiningbeeasilyandquicklyexecutedinanindustrialenvironmentwithminimalinvestmentofmanpowerSpindlegrowthmodelandcomponentmodifications.Initiallyafiniteelementanalysis(FEA)isc

7、onductedonthespindleassembly.ThisFEAcorrelatesthetemperaturerise,duetoheatingfromthespindlebearingsandthemotor,totheresultingstructuraldeformation.Additionally,thestructuraldeformationofthespindlealongwithtemperaturechangeatitsvariouscriticalpointsisexpe

8、rimentallyobtainedbyasystemofthermocouplesandcapacitancegages.TheexperimentalvaluesofthetemperaturechangesandthestructuraldeformationofthespindlequalitativelyagreewellwiththeresultsobtainedbyFEA.Consequently,athermaldispla