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1、精密连接技术及其在航空航天工业中的应用PrecisionJoiningTechniqueanditsApplicationinAerospaceIndustry ShanghaiJiaoTongUniversityMaterialsScienceandEngineeringCollegeSJTUWeldingEngineeringInstitute 1 Contents IntroductionConventionalweldingtechniquePrecisionjoiningtechniqueDifferencebetweenprecisionjoiningandconventional
2、weldingtechniqueMainapplicationareasofprecisionjoiningtechniqueSomefrequentlyusedtechniquesforprecisionjoiningMaterialinaerospaceandtheirjoiningfeaturesApplicationofprecisionjoiningtechniqueinaerospaceApplicationexamples ElectronicBeamBrazingforpartsinaerospaceApplicationexamples Laserweldingforpart
3、sinaerospaceConclusionandprospect 2 Introduction Thejoiningtechniqueisanindispensableprocessingmeansinmodernmanufacturing Itusesthemechanical chemicalmethods suchaspartialheatingorwithpressure tojointhetwopartsormaterials Commonlytherearenon permanentandpermanentjoint Non permanentjoint thejointpart
4、canbemovedordis assembled e g hingejoint chainjoint screwjoint etc Permanentjoint thejointcannotbemovedordisassembledexceptdestruction e g gluejoint rivetjoint allkindsofweldingjoints etc Hereonlytheweldingjointsandtheirweldingtechniquewillbediscussed Weldingtechniquegenerallyusessomekindofheatsourc
5、etopartiallyheatmaterial especiallymetal underthecertainprotectivecondition sometimeswithcertainpressure toformapermanentweldingjoint whichmeanstheatomicormolecularconnectionbetweenthetwomaterialsorparts 3 Introduction Weldingtechniquesareincreasinglyappliedinmanufacturingofproductsthatconsistofdiff
6、erentpartswithdifferentmaterials shapes structuresandfunctions toformacomplexentirebody Thustheworkingprocedureoftheentiredworkpiececanbegreatlysimplified thematerialcanbesavedandtheproductionefficiencycanbeincreased Theseekingforhighqualityandlowcostofproductistheimportantstrategytogetvictoryinthem
7、arketcompetitionformostenterprisestoday Andthehighqualityofproductisgenerallyguaranteedbyreasonableproductdesign reliableprocessingprecision andeffectiveinspectionmethod Asanimportantprocessingmeansinmanufacturingofmodernproduct thejoiningtechniqueanditsprecisionincreasinglygetextensiveattention Wit
8、hdevelopmentoftechnology theprecisionjoiningisbecominganeffectivewaytoreducefollowedworkingprocedures todecreasecost andtoimprovequality Insomeimportantareas suchasmicro electronics aerospaceetc theprecisionjoiningofsomemicro structuresbecomeacriticaltechniqueforsuccessfulmanufacturing thustheprecis
9、ionandrelibilityofjointbecomethemostimportantqualitycontrolpointofproduct 4 Conventionalweldingtechnique Theconventionalweldingtechnique suchasSMAW SAW GMAW GTAW etc arewidelyusedinmanufacturingandenjoythemainpopularitybecauseoftheirlowcostandsimpleoperation Butforweldingofsomespecialmaterialsorspec
10、ialstructures especiallysomemicro structures theirapplicationwouldberestrainedduetosomeshortcomings suchas Lowenergydensity Lowweldingspeedandefficiency Lowcontrollableprecisionofweldingparameters Lowdepth widthratioofweldingpool forthickworkpiecethemulti passweldingisnecessary WideHAZandlowperforma
11、nceofweldingjoint Bigdistortionofworkpiece correctionmeasuresareneeded Lowprecisionofjoint mechanicalpost processingwouldbenecessaryforsomeimportantworkpiece etc 5 Precisionjoiningtechnique Precisionjoiningtechniquewillusetheproperjoiningmethodandcontroltechniqueaccordingtothejointobject andcontrolt
12、hejoiningprocessprecisely soastoobtaintheanticipatedjointperformanceandprecision Accordingtothesizeofjointobject theprecisionjoiningtechniqueespeciallyforpackagingorassemblingofICcomponentsinmicro electronicareaiscalledMicro joiningtechnique Themainpurposeofthecommonprecisionjoiningistoobtainthehigh
13、jointprecisionbesidethereliablejointstrength Duringthemanufacturingofhot workingproducts theshape sizeanddistortionofjointedcomponentswouldbepreciselycalculatedandstrictlycontrolled sothemechanicalprocessingorothertreatmentsaregenerallynotnecessary Themainpurposeofthemicro joininginmicro electronica
14、reaistoobtainthehighconductivityandhighreliability Sothejoiningmethodsaresomewhatdifferentfromcommonjoiningmethods Somefactorsthatareneglectedincommonjoiningwouldbeverysensitiveundertheconditionofmicro joining andevenbethemaininfluencefactorforjointquality 6 Differencebetweenprecisionjoiningandconve
15、ntionalweldingtechnique 7 Mainapplicationareasofprecisionjoiningtechnique Micro electronics IC packaging micro joiningAerospace Joiningofdifferentspecialmaterials manufacturingofnavigationdevice detectionradarandotherprecisioncomponents Precisemachine ManufacturingofvarietyofNC machine robot lasersy
16、stem medicaldevice presssystem spinning printinganddyeingdevice semi conductorprocessingsystem etc IT Industry Manufacturingofvarietyofcommunicationdevice computer digitalproducts instrument sensors etc Automobile Preciseassemblyjoiningforvarietyofenginecomponentsandautomobilebodywork etc 8 Somefrequentlyusedtechniquesforprecisionjoining PreciseJoiningTech 9 Diffusionwelding JoiningPrinciple Undercertainpressure thematerialsurfacescontacteachother andthepartialplasticdeformationoccurstodestroyth
