金屬陶瓷刀具加工奧貝球鐵的切削性能研究.pdf

1、大連理工大學(xué)碩士學(xué)位論文金屬陶瓷刀具加工奧貝球鐵的切削性能研究姓名：黃震申請學(xué)位級別：碩士專業(yè)：機械電子工程指導(dǎo)教師：張弘弢20081201金屬陶瓷刀具加工奧貝球鐵的切削性能研究StudyonPerformancesofCermetCuttingToolsinMachiningAustemperedDuctileIronAbstractCermetcuttingtoolshaveexcellentsuperiorityinmachini

2、ngaccuracy，efficiencyandtoollivesbecauseoftheirgreathardness，hi曲wearresistanceandsuperchemicalstabilityHoweverthecuttingperformancesofTi(C，N)basedcermetcuttingtoolsaredirectlyinfluencedbytheproportionofCandNincontentItis

3、generallyagreedthatTi(C，N)basedcermetcuringtoolswithahigherNcontenthavesmallergrainsandhighertoughness，butlowerhardnessAustemperedductileironisakindofdifficulttomachinematerialduetoitshigllhardnessandstrengthandworkharde

4、ningThus，itisrequiredthatthecuringtoolsusedtomachineitalsoneedtobesuperiorinhardnessandtoughness，whicharejustvirtuesofTi(CN)basedcermetcuringtoolsInordertohaveabetterunderstandingofcuringpropertiesofTi(C，N)一basedcermetcu

5、ringtools，aseriesofcomparisonexperimentswiththeaustemperedductileironworkpiecewerecarriedout，usingfourtypesofinsertshomeandabroad，andthemachiningpropertiesofADlwerealsoanalysedFirstly，theeffectsofcuttingparametersoncurin

6、gforceswerestudied，andthefrictioncoefficientsoftherakefaceoftheseinsertswerecompared。TheresultsindicatedthatcuttingforcesofthesefourkindsofinsertsalldeclinedwiththeincreasingofcuringspeedDuetothelargeramountofNinNX2525th

7、anthatinYNG151，theformercermetinsertshadlowerfrictioncoefficientsInconditionofhigh—speedturning，thecoatsonPV30andYBC251couldreducefrictionsignificantlySecondlytoollivesandabrasionsofthefourtypesofinserts，aswellastheirwea

8、l“mechanism，wereanalyzedConclusionsweredrawnasfollowing：1)YNGl51insertswhichhadlowerNcontainsenjoyedamuchlongercuringlifethanNX2525；2)Duetotheirdifferentsubstrates，coatedcermetsinsertsPV30hadalongerlifethancoatedcemented

9、carbideYBC251；3)Thehightemperatureproducedbyhi曲curingspeedinthecontactingareaacceleratedtheadhesionofcermetsiriserts，whichWasthemainestwearoutmechanismofcermetinsertsathighspeed，andresultantlyledtoashortertoollifeSocurin

10、gspeedwasthemostsignificantfactorfortoollives“Halvethecuringspeedanddoublethecuringdepth”wasaneffectivewaytogetabalancebetweenmachiningefficiencyandtoollifeThirdlyandlastlytheinfluenceofcuringparametersonthedeformationra