三维打印技术中7075铝合金液滴沉积铺展过程的模拟-论文.pdf

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1、TransactionsofNonferrousMetals蠹Avai：lableonSlinecaitewwnwc．secieDnceidrierect．ctomSocietyofChinaPressTrans．NonferrousMet．Soc．China24(2014)1836-1843www．tnmsc．cnSimulationondepositionandsolidificationprocessesof7075A1alloydropletsin3DprintingtechnologyHai—pengLI，He-jun

2、LI，Le．huaQI，JunLUO，Han—songZUO1．StateKeyLaboratoryofSolidificationProcessing，NorthwestemPolytechnicalUniversity,Xi’an710072，China；2．SchoolofMechatronicsEngineering，NorthwesternPolytechnicalUniversity,Xi’an710072，ChinaReceived19July2013；accepted5November2013Abstract：I

3、nordertostudythesuccessivedepositionandsolidificationprocessesofuniformalloydropletsduringthedroD．on．demandthreedimensionalr3D1printingmethod，basedonthevolumeoffluid(VOF)method，a3Dnumericalmodelwasemployed．Inthismode1．the7075alloywimlargertemperaturerangeforphasechan

4、gewasused．Thesimulationresultsshowthatthesuccessivedepositionandsolidificationprocessesofuniforill7075alloydropletscanbewellcharacterizedbvthismode1．Simulateddropletsshapesagreewellwi廿lSEMimagesunderthesamecondition．Theefectsofdepositionandsolidificationofdropletsres

5、ultinverticalandL-shapedridgesonthesurfaceofdroplets，andtipsofdendritesappearneartheoverlapofdropletsduetorapidsolidification．Keywords：7075A1alloy；uniformdroplets；3Dmodel；3Dprintingtechnology；surfacemo~hologyFortunately,changesofdepositionandsolidification1Introducti

6、onprocessescanbepredicatedbymeansofnumericalsimulation．3DprintingtechnologyisanattractivealternativetoCurrently,agreatdealofresearcheshasbeentheconventionallymanufacturingtechniques．Asknownconductedonthedepositionandsolidificationoflowerasalladditivetechnology,3Dprin

7、tingtechnologyhasitsmeltingpointmetal，alloyandliquiddropletsonaexcitingadvantagesincost，speedandaccuracy[1，2]．substrate．Forinstance，QIetal[7]appliedanovelAmongdifferenttypesofmethodsof3Dprintingselectionmethodofscanningstepandfabricatedatechnology,drop-on-demand(DOD)

8、printingmethodisthree—dimensionalSn60-Pb40component．CHA0eta1oneoftheadvancedmethodscapableofforming3D[8】developedadirectdropletfabr