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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.Thispaperpresentsatypeofjetti
2、ngdispenserwhichisdrivenbypiezoceramicmaterial,highprecisionandwiderangeviscositycompatibilityareproposedbythisdevice.Consideringtheeffectof3Dprintingforceondrop-on-demandjetting,thispaperanalysesthetheoryofdrop-on-demandjetting,throughcontrastandcomparefourtypesofdrop-on-
3、demandjetting,thetechnologyofmechanicalneedleisadopted.Dynamicalmodelisbuiltbasedonthistypeofdrop-on-demandjetting,andinordertodesignthejettingdispenser,thispaperdeducesthenecessaryconditionfordrop-on-demandjetting.Basedonthetheoreticalresearchindrop-on-demandjettingandcom
4、binedwithpiezoelectricactuationtheory,thispapercompletesthephysicaldesignforamplicationmechanism、needle、nozzleandsoon.Anon-contactanddrop-on-demandJettingdispenseractuatedbypiezoelectricactuationismanufactured.Ithaslaidacertainfoundationfortheflowmodelinganalysisinnozzlewi
5、thFluent.Governingequationsaresetupforaviscousandimcompressiblelaminarflowthroughthinorificebasedonfluiddynamicsafterthephysicaldesignforthejettingdispenser.ChangesofliquidsurfaceinambientairaretrackingbymeansofVolumeofFluidmethod(VOF)whichisamodelineulerianmethod.Inthispa
6、per,simulationandanalysishavebeenmadeontheproceduresthatneedlemovementdowntopedestalwithliquidflowsthroughjettingnozzleandtheformationofadropletwhichprovideareferenceofoptimizationforthephysicaldesignforthejettingdispenserandprovidesomerelatedguidanceinexperimentsconcernin
7、gdrop-on-demandjetting.Finally,accordingtotherequirementsofthedispensingprocessfor3Dprinting,amovingplatformissetup,andsomeexperimentsrelateddrop-on-demandjettingproceedbasedonit.Keywords:3Dprinting,drop-on-demandjetting,piezoelectricactuation,mechanicalneedle,amplicationm
8、echanism-II-哈尔滨工业大学工学硕士学位论文目录摘要..........................................................
