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1、哈尔滨工业大学工学硕士学位论文Abstract3Dprintinghasbeenwidelyconcernedandappliedinfieldofmanufacturingequipmentindustry.However,drop-on-demandJetting,whichshowsstrongvitalityin3Dprinting,faceswithsomechallenges:Inthemicro-jet,theexistingresolutionisnotenough.Thispaperpresentsaty
2、peofjettingdispenserwhichisdrivenbypiezoceramicmaterial,highprecisionandwiderangeviscositycompatibilityareproposedbythisdevice.Consideringtheeffectof3Dprintingforceondrop-on-demandjetting,thispaperanalysesthetheoryofdrop-on-demandjetting,throughcontrastandcomparef
3、ourtypesofdrop-on-demandjetting,thetechnologyofmechanicalneedleisadopted.Dynamicalmodelisbuiltbasedonthistypeofdrop-on-demandjetting,andinordertodesignthejettingdispenser,thispaperdeducesthenecessaryconditionfordrop-on-demandjetting.Basedonthetheoreticalresearchin
4、drop-on-demandjettingandcombinedwithpiezoelectricactuationtheory,thispapercompletesthephysicaldesignforamplicationmechanism、needle、nozzleandsoon.Anon-contactanddrop-on-demandJettingdispenseractuatedbypiezoelectricactuationismanufactured.Ithaslaidacertainfoundation
5、fortheflowmodelinganalysisinnozzlewithFluent.Governingequationsaresetupforaviscousandimcompressiblelaminarflowthroughthinorificebasedonfluiddynamicsafterthephysicaldesignforthejettingdispenser.ChangesofliquidsurfaceinambientairaretrackingbymeansofVolumeofFluidmeth
6、od(VOF)whichisamodelineulerianmethod.Inthispaper,simulationandanalysishavebeenmadeontheproceduresthatneedlemovementdowntopedestalwithliquidflowsthroughjettingnozzleandtheformationofadropletwhichprovideareferenceofoptimizationforthephysicaldesignforthejettingdispen
7、serandprovidesomerelatedguidanceinexperimentsconcerningdrop-on-demandjetting.Finally,accordingtotherequirementsofthedispensingprocessfor3Dprinting,amovingplatformissetup,andsomeexperimentsrelateddrop-on-demandjettingproceedbasedonit.Keywords:3Dprinting,drop-on-dem
8、andjetting,piezoelectricactuation,mechanicalneedle,amplicationmechanism-II-哈尔滨工业大学工学硕士学位论文目录摘要..........................................................
