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1、南京航空航天大学博士学位论文钛合金高速铣削技术的基础研究姓名：耿国盛申请学位级别：博士专业：机械制造及其自动化指导教师：徐九华20060501南京航空航天大学博士学位论文劳试件断口进行了分析。结果表明在一定范围内提高切削速度有利于改善零件的疲劳性能。关键词：钛合金，高速切削，切削温度，切削力，刀具磨损，表面完整性，疲劳性能III钛合金高速铣削技术的基础研究AbstractTitaniumalloysfindmoreandmoreapplicationsinmanyindustrialfieldsbecauseoftheirhighspecifics
2、trength,goodcorrosionresistanceandhighthermalstability.However,titaniumalloyiswellknownasadifficulttomachinematerial,becauseofitslowthermalconductivity,smallelasticmodule,andhighchemicalactivity.Manyresearchershaveputtheirattentionsonthehighspeedmachining(HSM)oftitaniumalloy.I
3、nthispaper,someresearcheswerecarriedoutonthefundamentalaspectsofhighspeedmillingoftitaniumalloys,suchasthecuttingforce,cuttingtemperature,toolwear,surfaceintegrityandtheinfluenceofcuttingspeedonthefatiguepropertyofthefinishedproduct.1.Cuttingforceinhighspeedmillingoftitaniumal
4、loyTherelationsbetweencuttingforceandmillingparameters,toolwear,anddifferentworkpiecematerialswereinvestigatedrespectively.Thevariationofthecuttingforceintoolcoordinatesystemandthefrequencypropertiesofthecuttingforcewerestudied.Theeffectsofhighfrequencycomponentsandimpactonthe
5、cuttingforcewerealsoanalyzed.2.CuttingtemperatureinhighspeedmillingofTialloyCuttingtemperaturewasmeasuredbyaconstantan-workpiecethermalcouple.Thephysicalmeaningoftheacquiredelectromotiveforce(EMF)signalswasanalyzed.Basedonthisanalysis,thetemperaturevariationandthethermalimpact
6、ofthecuttingedgeduringacuttingcyclewereinvestigated.Theeffectsofcuttingspeed,toolwear,andothercuttingconditionsonthemillingtemperaturewerealsoinvestigated.3.ToollifeandtoolwearmechanismOrthogonalandsinglefactorexperimentswerecarriedouttoinvestigatetherelationsbetweentoollifean
7、dcuttingparameters.TheeffectsoftoolandIV南京航空航天大学博士学位论文workpiecematerialontoollifewerealsostudied,andtheempiricalequationsoftoollifewereestablished.Toolwearmechanismandcharacteristicinhighspeedmillingoftitaniumalloywereanalyzedbyscanningelectronmicroscope(SEM)andenergydisperses
8、pectroscopy(EDS).4.Surfaceintegrityinhighspeedmillingoftitani
