風(fēng)電傳動(dòng)關(guān)鍵部件缺陷分析及對策.pdf

1、大連海事大學(xué)碩士學(xué)位論文風(fēng)電傳動(dòng)關(guān)鍵部件缺陷分析及對策姓名：曹邦興申請學(xué)位級別：碩士專業(yè)：載運(yùn)工具運(yùn)用工程指導(dǎo)教師：于志偉20120624英文摘要ABSTRACTThispapermainlypresentsafailureanalysisonthreekindsofkeytransmissioncomponents(includingyawgearringsecondarysungearsandtllirdoutput—gears)，

2、whichcrackedinserviceorfabricatingprocessThemacrostructureandmicrostructureoffailedcomponentswereobservedanalyzedbyopticalmicroscope(OPM)andscanningelectronmicroscopy(SEM)Chemicalcompositionofmatrixmaterialsandmicrocompo

3、sitiononthefracturesurfacesandmatrixmaterialswereanalyzedbyemissionspectroscopy(OES)andXrayenergydispersivespectroscopy(EDX)ThepresentphasesweredeterminedusingXraydiffraction(XRD)Macroandmicrofractographicfeatureswereinv

4、estigatedvisuallyandSEMtodeterminethefailuremechanismandfailurecausesCombinedwitlltheheartreatmenttestsinsite，theimprovementswereproposedtopreventfromthesimilarfailureinfutureThemainresultsCanbeconcludedasfollows：(1)Inth

5、eprocessofmidfrequencyquenchingthesteelswimmediumhardenabilitysuchas40Crsteel，areextremelysensitivetousingtemperaturerangeofnewtypewatersolublequenchingagent(F2000)basedOllorganicpolymers，andiseasilyinducedcrackingduring

6、quenchingbeyondthesuitabletemperaturerangeControlthetemperatureofquenchingmediumandmonitoritsconcentrationregularlytoavoidsimilarcrackingfailure(2)Crackfailureofsun—gearsiscloselypresenceofcalciumaluminateinrawmaterialsA

7、newtechnologyWasconductedonthelargersBngear：oncequenchingaftercarburizing，followedbyspheroidizingannealing，todecreasetensilestressonthesubsurface，whichCanbepreventfromcrackingofthelargeStillgearevenifpoormetallurgicalqua

8、lityisnotchanged(3)InsufficientholdingtimeduringsecondaryquenchingcarburizedgearCanleadtolowsurfacehardnessandcorehardnessofcarburizedgearSOastobriI培aboutfaultycarburizedgearOccurrenceofthedefectonthecarburizedgearCanbea