高速切削Ti6 Al4 V锯齿形切屑形成的表征.pdf

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1、机床与液压Mar．2014HydromechatronicsEngineeringV01．42No．6DOI：10．3969／j．issn．1001—3881．2014．06．014CharacteristicsofserratedchipformationinhighspeedmachiningTi6AI4VQi—biaoYANG，PengCHEN，Da—zhangYOU，Zhan—qiangLIUSch。。ofMechanicalEngineering，HubeiUniversityofTech。logy，WuhⅡn430068，Chin。：2S

2、choolofMechanicalEngineering，ShandongUniversity．Jinon250061．ChinAbstract：Adeepunderstandingofthegenerationandcharacteristicsofserratedchipformationcanobtainsomepracticaladvicesofcontrollingthistypechipinengineeringapplications．Thecharacteristicsofserratedchipincludingthefrequen

3、cyofserration，thedegreeofsegmentationandthespaceofadiabaticshearbandarecomprehensivelyinvestigatedinthispaper．Experi．mentsofhighspeedmillingTi6AI4Vwereperformed．TheinvestigatedmaterialisTi6AI4Vsinceitispronetoformserratedchipinmachiningprocess．ThechipsofTi6AI4Vunderdiferentcu~i

4、ngspeedsandfeedpertoothwerecollectedduringmachining．Afterinlayandpolishingprocessforthecollectedchips，thechipmorphologycouldbeobservedbyVHX-600ESOdigitalmicroscope．Theexpressionsofthefrequencyofserration．thedegreeofsegmentationandthespaceofadia．baticshearbandweredeterminedthrou

5、ghmicrocosmicobservation．Theresultsshowthatthespaceofadiabaticshearbandgetsdecreasedwiththeincreaseofcu~ingspeedandthefeedpertooth．Onthecontrary，thefrequencyofserrationwillgetincreasedwiththeincreaseofthecut．tingspeedanditwillgetdecreasedwiththeincreaseofthefeedpertooth．Theincr

6、easeofcut．tingspeedorthefeedpertoothcouldintensifythedegreeofchipsegmentation．Thedegreeofsegmentationcanbeusedasthecriterionofordinarycu~ing，highspeedcu~ingandultrahighspeedcu~ing．Keywords：Serratedchip，HighspeedmachiningAdiabaticshearband，Ti6AI4V，process．Thestudyofthecharacteri

7、zationofserrated1．Introductionchipisconducivetoacorectunderstandingofserra—tedchipformationmechanism．ThroughorthogonalTi6AI4Visakindofdificult．to—cutmaterialduecuttingTi6AI4V，itwasfoundthattheshearbandtothelowthermalconductivityandlowelasticmodu—widthandthespaceofshearbandwered

8、eterminedlus．Itispronetoformserratedchipinhighspeedbym