外文翻译--航空材料超声辅助车削的仿真与实验研究 英文版.pdf外文翻译--航空材料超声辅助车削的仿真与实验研究 英文版.pdf

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OFG,ISPROCESSULTRASONICTHEULTRASONICKEYWORDSULTRASONICMACHINING;TURNING;FINITEELEMENTMODELLING;MICROSTRUCTURETHE‘EXISTENT,CONVENTIONALTURNINGCTTECHNOLOGYFREQUENCYULTRASONICVIBRATION,SUPERIMPOSEDONTHECONVENTIONALMOVEMENTOFTHECUTTINGTOOLFIG1,HASPROVEDTOBEEffECTIVEINMACHININGINTRACTABLEMETALALLOYSASWELLASBRITTLEMATERIALS,SUCHASCERAMICSANDCUTTINGFORCES7,8TROLSYSTEMTHISSYSTEMSTABILISESTHETURNINGPROCESSWITHULTRASONICVIBRATIONANDMAKESTHISPROCESSHIGHLYCONTROLLABLETHEDETAILEDDESCRIPTIONOFTHISNOVELCONTROLSYSTEMISGIVENIN9,10THEEXPERIMENTALPARTOFTHISPAPERSTUDIESUATWITHAUTORESONANTCONTROLINCOMPARISONTOCONVENTIONALTURNINGANOTHERIMPORTANTISSUECONCERNINGUATISTHECORRESPONDINGAUTHORTEL441509227504;FAX441509CONVENTIONALMACHININGOFMODERNNICKELANDTITANIUMBASEDSUPERALLOYS,USEDINAEROSPACEAPPLICATIONS,CAUSESHIGHTOOLTEMPERATURESANDSUBSEQUENTFASTWEAROFCUTTINGEDGESEVENATRELATIVELYLOWCUTTINGSPEEDSAGROWINGDEMANDFORMACHININGTHESEINTRACTABLEMATERIALSREQUIRESNEWADVANCEDTURNINGTECHNOLOGIESSUCHATECHNOLOGYWASINTRODUCEDIN1960SHIGHNEVERTHELESS,UPTOTHEPRESENTDAYUATHASNOTBEENWIDELYINTRODUCEDINTOINDUSTRIALENVIRONMENTTHEMAINREASONFORITISSENSITIVITYOFTHEUATPROCESSTOTHELOADAPPLIEDTOTHECUTTINGTIP,RESULTINGINTHELOSSOFCUTTINGEffiCIENCYWHENTHELOADCHANGESORADIffERENTTIPISUSEDHOWEVER,THISLIMITATIONHASRECENTLYBEENELIMINATEDWITHTHEINVENTIONOFTHEAUTORESONANTCON1INTRODUCTIONTURNINGISAMACHININGPROCESS,WHEREATHINSURFACELAYEROFTHETREATEDMATERIALISREMOVEDFROMAWORKPIECEBYASHARPWEDGESHAPEDCUTTINGTOOLFORMINGACYLINDRICALSURFACETHISTECHNOLOGYHASBEENUSEDFORCENTURIESMAINLYFORCUTTINGVARIOUSTYPESOFMETALLICMATERIALSHOWEVER,INTHERECENTYEARS,ARANGEOFNEWALLOYSANDCOMPOSITEMATERIALSHASBEENDEVELOPEDFORVARIOUSENGINEERINGAPPLICATIONSMANYOFTHESENEWMATERIALSBECOMEMUCHMOREDIffiCULTTOCUTWITHGLASSTHISTECHNOLOGY,CALLEDULTRASONICALLYASSISTEDTURNINGUAT,DEMONSTRATESARANGEOFBENEfiTSINMACHININGHARDMETALALLOYSADECREASEINCUTTINGFORCESOFUPTOSEVERALTIMES1–4,IMPROVEMENTINSURFACEfiNISHBYUPTO50COMPAREDTOCT5ANDNOISEREDUCTION6ASFORMACHININGOFBRITTLEMATERIALS,CERAMICSANDGLASSPRESENTLYREQUIREPROLONGEDANDEXPENSIVEPOSTPROCESSINGTOOBTAINTHESURFACEQUALITYREQUIREDFOROPTICALCOMPONENTS;UATALLOWSOBTAININGMIRRORSURFACEfiNISHINMACHININGTHESEMATERIALSASWELLASCONSIDERABLEREDUCTIONINTOOLWEARANDAVERAGEULTRASONICALLYASSISTEDTURNINGANDEXPERIMENTALVIBABITSKY,AVMITROFANOV,WOLFSONSCHOOLOFMECHANICALANDMANUFACTURINGENGINEERINABSTRACTULTRASONICALLYASSISTEDTURNINGOFMODERNAVIATIONMATERIALSAMPLITUDEAC2515LMSUPERIMPOSEDONTHECUTTINGTOOLMOVEMENTNONLINEARRESONANTMODEOFVIBRATIONTHROUGHOUTTHECUTTINGWORKPIECESMACHINEDCONVENTIONALLYANDWITHTHESUPERIMPOSEDPROCESSANDNANOINDENTATIONANALYSESOFTHEMICROSTRUCTUREOFMODELPROVIDESNUMERICALCOMPARISONBETWEENCONVENTIONALANDCUTTINGFORCESANDCONTACTCONDITIONSATTHEWORKPIECE/TOOLINTERFACEC2112004ELSEVIERBVALLRIGHTSRESERVEDULTRASONICS422004227502EMAILADDRESSVSILBERSCHMIDTLBOROACUKVVSILBERSCHMIDT0041624X/SEEFRONTMATTERC2112004ELSEVIERBVALLRIGHTSRESERVEDDOI101016/JULTRAS200402001AVIATIONMATERIALSSIMULATIONSSTUDYVVSILBERSCHMIDTLOUGHBOROUGHUNIVERSITY,LEICESTERSHIRELE113TU,UKCONDUCTEDWITHULTRASONICVIBRATIONFREQUENCYFC2520KHZ,ANAUTORESONANTCONTROLSYSTEMISUSEDTOMAINTAINTHESTABLEEXPERIMENTALCOMPARISONOFROUGHNESSANDROUNDNESSFORVIBRATION,RESULTSOFHIGHSPEEDfiLMINGOFTHETURNINGMACHINEDMATERIALAREPRESENTEDTHESUGGESTEDfiNITEELEMENTTURNINGOFINCONEL718INTERMSOFSTRESS/STRAINSTATE,81–86WWWELSEVIERCOM/LOCATE/ULTRASMECHANICSOFTHISPROCESSTHEREAREONLYAFEWSOURCESOFTHEWORKPIECEPARALLELTOTHEXAXIS,FIG1B,ORINTHEFEEDDIRECTION,IEALONGTHEAXISOFTHEWORKPIECEZAXIS,FIG1BASELFSUSTAINEDRESONANTMODEOFVIBRATIONOFTHISCUTTINGSYSTEMISIMPLEMENTEDVIATHEAUTORESONANTCONTROLSYSTEM,WHICHISDESCRIBEDINDETAILIN9,10ARANGEOFTURNINGTESTSHASBEENCONDUCTEDTOCOMPARETHEUSAGEOFUATANDCTFORMACHININGAVIATIONMATERIALSTHEDETAILEDDESCRIPTIONOFTHESETESTSCANBEFOUNDIN5AMONGTHEMATERIALSUSEDFORTHETESTSISINCONEL718–AHIGHGRADEHEATRESISTANTNIBASEDSUPERALLOYWIDELYUSEDINTHEAEROSPACEINDUSTRYTHISMATERIALISVERYABRASIVEANDCAUSESTHETOOLBLUNTINGANDHIGHCUTTINGTEMPERATURESWHENMACHINEDCONVENTIONALLYTHESURFACEQUALITYOBTAINEDBYTURNINGISONEOFTHECRUCIALFACTORSINMETALCUTTINGANDISEXTREMELYSENSITIVETOANYCHANGESINTHEMACHININGPROCESSTHESURFACEfiNISHOFSPECIMENSISCOMPAREDINTERMSOFAVERAGEROUGHNESSMEASUREMENTRAANDMEASUREMENTOFROUNDNESSTHEPEAKTOVALLEYMEASURE,USINGTHETAYS42200481–86FIG1EXPERIMENTALSETUPFORULTRASONICALLYASSISTEDTURNINGA,ANDASCHEMEOFRELATIVEMOTIONOFTHEWORKPIECEANDCUTTINGTOOL82VIBABITSKYETAL/ULTRASONICATTEMPTINGTODESCRIBETHEPROCESSESINTHEWORKPIECE/CUTTINGTOOLINTERACTIONZONEANDTHEIRINflUENCEONTHESTRUCTUREOFTHEMACHINEDMATERIAL3,6,11THESEWORKSSTUDYMOSTLYTHEDYNAMICSOFTHEULTRASONICMACHINEUNITANDNOTTHERESPONSEOFTHETREATEDMATERIALTOTHISTECHNOLOGY,WHILEACLEARUNDERSTANDINGOFMECHANICALPROCESSESINTHEMATERIALDURINGUATWOULDCERTAINLYALLOWAFURTHERDEVELOPMENTOFTHEUATTECHNOLOGYTHEMAINAIMOFTHISPAPERISTOSTUDYEXPERIMENTALLYANDNUMERICALLYTHEMATERIALMECHANICSOFTHEUATPROCESS2EXPERIMENTALSTUDIESTHEEXPERIMENTALSETUPUSEDTOSTUDYUATISSHOWNINFIG1THEWORKPIECEISCLAMPEDINTHECHUCKOFTHEUNIVERSALLATHEANDROTATESWITHACONSTAN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