强流脉冲电子束强化齿轮弯曲疲劳性能的的研究

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1、AbstractAbstractThesituationofforceisverycomplicatedwhengearworks,sokindsoffailuresusuallyappear,suchaspitting,peeling,gluing,excessivewearandbendingfatiguefracture，whilethebendingfatiguefractureaccountsforalargeproportionofallfailures.Withthedevelopmentofmodernindustry，thegear

2、sthatwithlightweightbuthighstrengtharerequired.Internationalstudyonthestrengthofgeararemainlyinaspectsofoptimizationoftoothshapeandsurfacetreatmentongear,undercertainconditions,whiletheroleofincreasingthebendingfatiguestrengthoftoothislimitedthroughtheoptimizationoftoothshape,a

3、ndtraditionalsurfacetreatmenttechnologiesalsofacesomelimitations,soitmakesgreatimportancetostudythenewsurfacetreatmenttechnologiesthatareapplicableongears.High-currentpulsedelectronbeam(HCPEB)isanewandefficientsurfacemodificationtechnique.Withitshighenergydensityandhighefficien

4、cy,changesofthesurfacestructureareinducedandthepropertiesofthesurfacelayerofmaterialscanbeimproveddirectlyandeffectively.ThisarticleoriginatesfromapartoftheprojectofNationalNaturalScienceFoundationofChina,“thestudyonprocessandpropertyofsurfaceamorphizedgears”(No.50775229).Thegr

5、indedandnon-grindedoriginalgearsareirradiatedbyHCPEB,andtestofbendingfatiguestrengthoftheoriginalgearsandirradiatedgearsiscarriedoutonhigh-frequencyfatiguetester.ThestudyonaffectofHCPEBtobendingfatigueofgearswithdifferentsurfaceconditionsisdoneinordertoobtainthegearwithlongerli

6、fe.Majorworksofthepaperareasfollow:(1)Summaryofthemainfactorsthatinfluencethebendingfatiguestrengthofgear.(2)Thethermal-mechanicalcouplingmethodinfiniteelementanalysissoftwareANSYSisusedtoanalyzethetemperatureandthermalstressdistributionin40CrsteelirradiatedbyHCPEB.Theresiduals

7、tressofthesurfaceafterrepeatedlyirradiationisgiven.(3)Thegrindedandnon-grindedgearsthatwithtwokindsofsurfaceconditionaretreateddirectlybyHCPEBofwhichtheparametersareoptimized.(4)Thetestofbendingfatiguestrengthofgearsiscarriedoutonallgearsundertheconditionofconstantamplitudeload

8、andthebendingfatiguestrengthofgrindedandnon-grindedori