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1、哈尔滨工业大学工学硕士学位论文AbstractInertialconfinementfusion(ICF)canproducehigh-qualityandlow-costenergyandhasbecomeahotresearchtopicnowadays.LiF(LithiumFluoride)crystaliswidelyusedasopticalwindowinICFrelatedexperimentsforitsexcellenttransmissivityandwidewavebandfortransmission.Thestair-shapefusiontargetisantyp
2、icalexample,itcanhardlybemanufacturedbyothermanufacturemethodsforitsstrictdemandsfordimentionalaccuracyandsurfacequality,whilemicromillinghasitsdecidedadvantage.However,LiFisakindofsoftbrittlecrystalandductilemodecuttingposesachallengetotheselectionofmicromillgeometriesandprocessingparameters.Asares
3、ult,it’sofgreatimportancetoimplytheresearchofmicromillsdesignandprocessparametersoptimizationwhenLiFcrystalismicromilled.InicialresearchofthisprojecthasshowedthatextremelyseriousdiffusivewearexisedbetweenWCbasedmicromillsandLiFcrystal.Thewearmechanismswerestudied.ResultsshowedthatWCfromthetoolbaseme
4、ntdiffuseddramaticallytoLiFcrystalandreactedwithittoproduceLi2C2andgasWF,whichwasthemainreasonfordiffusivewear.PCDwasultimatelyselectedasthetoolmaterialformillingLiFcrystalanditschemicalinertnesswasexperimentalverified.Twotypesofmicroendmillsweredesigned.TheirtoolgeometrieswereoptimizedbyFiniteeleme
5、ntmethod(FEM).Afteroptimization,tooltypeⅠhadtheradialrakeangle,radialclearanceangle,axialrakeangleandaxialclearanceangleof-35°,9°,-25°and20°respectively,andtooltypeⅡhadtheradialrakeangle,radialclearanceangle,axialrakeangleandaxialclearanceangleof-60°,12°,-55°and20°respectively.Simulationresultsshowe
6、dthatthecuttingperformanceoftooltypeⅠwasnotsogoodastheperformanceoftooltypeⅡ.TheprocessparameterswereoptimizedbybothFEMandsingle-factorexperimentswithtooltypeⅡ.Resultsshowedthat,asthefeedpertoothandspindlespeedincreased,thequalityofslotsurfacebecamebetterthenworse.Thebestfeedpertoothwas665nm/zandthe
7、bestspindlespeedwas65000r/min.Asthedepthofcutincreased,theslotsurfacebecameworseanditwasbettertokeepthedepthofcut-II-万方数据哈尔滨工业大学工学硕士学位论文below2μm.TheorthogonalexperimentsweredonewiththetooltypeⅠ,toolty
