基于焊接的火车钩舌再制造修复过程应力变形研究-材料加工工程专业论文.docx

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基于焊接的火车钩舌再制造修复过程应力变形研究-材料加工工程专业论文.docx

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基于焊接的火车钩舌再制造修复过程应力变形研究-材料加工工程专业论文

AbstractCouplerknuckleisanimportantcomponentofthebufferdevicefortraincoupler.Long-termusewillcausetheseriouswearcracksorevenscrappingontheS-surfaceofcouplerknuckle.ThereforeitspracticallyusefultorepairworncouplerknucklesbyGMAW-basedremanufacturingtechnology,andstudythestress,deformationprocessandoptimizethedepositingpathtoimprovetherepairquality.Inthispaper,thethermalprocess,stressanddeformationintheremanufactuingprocessofcouplerknuckle(13Atype)withthetypicaldepositingpatharestudied,andthedepositingpathisoptimizedbyanalyzingthethermalprocess,stressanddeformationindifferentdepositingprocesseswithdifferentdepositingpaths.Thethermal-mechanicalcoupledfiniteelementmodelsofrepairingthecouplerknuckleswereprensentedusingthesoftwareMsc.Marc.Duetotheproblems,suchaslargedimensions,complexstructure,largenumberofelements,nonlinearvariationofmaterialpropertieswithdifferenttemperatures,difficultyintheconvergenceofcalculation,intricateboundaryconditions,thelongcalculatedtimeandsoon,thelifeanddeathelementmethodwasadoptedtoactivateelementsalongthedepositingpathsgradually,andthecontactbodieswereusedtoeffectivelydecreasetotalnumberofelementsandimprovecalculationspeed.Meanwhile,theverifiedexperimentswerecarriedout,andthethermalcyclesandresidualstressesattypicallocationsweremeasured.Aftercomparison,simulationresultsagreedwithexperiments,verifingthemodelcreated.Distributionrulesofthetemperatureandstressfiledintheremanufacturingprocessalongthelongedgesfrominsidetooutsidewasrevealed,andtheresidualstressdistributionanddeformationwasstudied.Resultsrevealthatformerpasshaspreheatingeffectonlaterpasses,andthelaterpasshaspost-heatingeffectonformerpass.Thermalaccumulationeffectincreasedwiththenumberincreaseofthedepositingpass.Besides,post-heatingeffectcanreleasesomestressofformerpasses.TheresidualstressislargerintheconcavefaceofS-surface,wheretherestraintishigher,thanthatintheconvexface.Andthelocalmaximumstressappearsinthedepositingregionofthelastpass.Aftercomparingtheeffectsofdifferentcladdingpat