TC4多層板結(jié)構(gòu)超塑成形-擴(kuò)散連接工藝數(shù)值模擬與試驗(yàn)研究.pdf

1、南京航空航天大學(xué)碩士學(xué)位論文TC4多層板結(jié)構(gòu)超塑成形擴(kuò)散連接工藝數(shù)值模擬與試驗(yàn)研究姓名：崔元杰申請(qǐng)學(xué)位級(jí)別：碩士專業(yè)：航空宇航制造工程指導(dǎo)教師：童國(guó)權(quán)201101TC4多層板結(jié)構(gòu)超塑成形擴(kuò)散連接工藝數(shù)值模擬與試驗(yàn)研究IIABSTRACTSuperplasticfmingdiffusionbonding（SPFDB）isoneofthemainprocessmethodsfthemanufacturingoflargecomplexthi

2、ntitaniumalloystructuresinaerospaceindustry.Thetitaniummultisheetstructuresmadebythisprocesswhichbreakthroughthetraditionalsheetmanufacturingmethodsarelightrigidindesigntheprocesscanshtenthemanufacturingcyclereducethecos

3、t.ThetitaniumalloymultisheetstructuresmadebySPFDBprocesshavebeenwidelyusedinaerospacefieldsabroadtheeconomicbenefitsaresignificant.Comparedwithdevelopedcountriesthemanufacturingprocessleveltheapplicationoftitaniumalloymu

4、ltisheetstructuresSPFDBtechnologyhavenotbeensoadvancedinchinaatpresent.Mainprocessdefects:Theoutersheetofthreesheetstructureoftenappears“groove”theimproperprocesscontrolcanresultinDBinadequatebecauseoflargeDBareainfoursh

5、eetstructure.UsingCADCAEtooptimizethestructurehasbecomeoneofthemostimptantresearchonSPFDBprocessinaerospacefields.AccdingtoaboveprocessdefectsfollowingwksaredoneduringtheresearchonTC4multisheetstructureSPFDBprocess.First

6、theratioofinitialoutersheetthicknesstoinnersheetthicknessr1（r1=toutertinner）、theratioofDBwidthtooutersheetthicknessr2（r2=btouter）aretwoimptantstructuralparametersthatinfluencethegrooveofthethreesheetstructure.Thediestruc

7、turegassystemaredesignedaccdingtothreesheetSPFDBSPFDBprocessissimulatedinMarcsimulationisappliedtoanalyzetheinfluenceofr1r2onthegroovedefect.FinallybasedonsimulationthethreesheetSPFDBprocessexperimentofTC4iscarriedoutbyD

8、BfirstthenSPFtheDBratioishighthicknessdistributionisunifmno“groove”inoutersheet.TheresultsshowthatitisusefultoreducetheoutersheetdefectwhenstructuresatisfiesinTC4threesheetSPFDBprocess.BestDBparameters:temperature900DBpr

9、essure2~3.5MPakeepingpressuretime3600sBestSPF℃parameters:temperature900strainrate0.00098s℃1fmingtime2000skeepingpressure2.5MPa.TheSPFDBprocessoffoursheetstructuethatisoftencarriedoutbySPFDBatthesametimehastheacteristicof

10、multisheet、largedefmationofinnersheetlargeDBarea.Therefetheinputgasvacuumsystemarecomplex.ThefoursheetstructureisdesignedaccdingtofoursheetSPFDBprocessTheTC4SPFDBprocessissimulatedbyMARCsimulationisappliedtoanalyzethepro