双轴数控专用机床可靠性优化设计分析

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1、浙江工业大学硕士学位论文STUDYONRELIABILITYoPTIMIZATIONDESIGNFORDOUBLE．AXISCNCMACHINETOOLABSTRCATAsthemainstreamprocessingequipmentofmodernmanufacturing，thequantityandperformancelevelofCNCmachinetoolreflectsacountry’Soverallmanufacturingcapacity．Atpresent，thereisabiggapbetweenthelevelofdomesticC

2、NCmachinetoolontechnologyanddevelopedcountries．Theperformancelevelcanbarelymeetthegrowingdemand,especiallyinaccuracyandreliabilityofthemachine．Meanwhile，traditionalmethods，whichusuallyusealargersafetyfactorandignoretheinfluenceofuncertainfactorssuchasmachiningerrors，areusedinthemach

3、ineoptimizationdesignprocess．Thesemaycausewasteofresourcesandthereliabilityofmachinetoolisnotprotected．Therefore，studyingonreliabilityisrequiredinoptimizationdesignofmachinetool，SOtheperformanceisguaranteed．Thedouble-axisCNCmachinetoolforbearingringisusedasstudyobject．加埘ngattheheavy

4、weightofthemachinetool，reliabilityoptimizationdesignforkeycomponentsiscompletedwiththeobjectiveofminimumweightofthemachinetool，basedonreliabilityoptimizationmethod．Themaincontentsareasfollows：(1)Theobjectsforreliabilityoptimizationdesignaredeterminedbasedontheanalysisofproblemsinrel

5、iabilityoptimizationdesignofthemachinetool。Thenoptimizationmodelingmethodsareresearchedandsolutionstrategyforreliabilityoptimizationdesignofdouble·axisCNCmachinetooliScarriedout．(2)Thedouble—axisCNCmachinehastWOspindles．Finiteelementanalysisiscarriedoutforbothspindlesafterthestudyon

6、theforceofspindleassemblyandsubspindleassemblyfordifferentconditions．Thenstressanddeformationcontoursofheadstockandsubheadstockareobtainedafterthestudyoftheirstaticanddynamiccharacteristics．Theirsafetyisalsostudied．Thisisthebasisforoptimization．(3)Theheat—structuralcoupledfiniteelem

7、entmodelisestablishedtoanalyzedtemperaturedistributionofheadstockandsubheadstock．Validatethemodelbyexperiment．MathematicalmodelforreliabilityoptimizationdesignisestablishedwiththeintegrationofIsighttostudyontheinfluenceofdesignvariablesonheadstockandsubheadstockperformance，withthemi

8、nimumweightofheadst