2110802057_唐波_机械电子工程_基于流体体积模型的软性

201012201012DissertationSubmittedtoZhejiangUniversityofTechnologyfortheDegreeofMasterNumericalSimulationandExperimentalStudyofSoftnessAbrasiveBasedonVolumeofFluidModelCandidate:TangBoAdvisor:ProfessorJiShimingAssociateResearcherLiYanbiaoCollegeofMechanicalEngineeringZhejiangUniversityofTechnologyDec20101______2”IPreston(1)Preston(2)(3)ABSTRACTIINUMERICALSIMULATIONANDEXPRIMENTALSTUDYOFLIQUID-SOLIDSOFTNESSABRASIVEBASEDONVOLUMEOFFLUIDMODELABSTRACTWiththeincreasingdemandofminiaturizationofcomponent,highrequirementsofmouldsurfaceandflowchannelqualityhasbeenbrought.Withmanygrooves,holes,prisms,pyramids,narrowslitsandsooninthemould,thestructuralsurfacecannotbemachinedbytools..Sinceabrasiveflowcanbeshapedwellbytheprofile,whileisapplyingtopolishthestructuralsurfaceofmould,theabrasiveflowhasitsuniqueadvantage.Inordertomakeclearaboutflowandmotioncharacteristicofsoftnessabrasiveflow,oneofthemotioninterfacetracertechniques(volumeoffluid)isputforward,whichappliestoanalysismotionfieldofsoftnessabrasiveflow.Motioncharacteristicofsingleabrasiveparticleandabrasivegroupandthemodeofactionbetweenabrasiveflowandwallwereanalyzedintherestrainedchannel,andthePrestonequationofmaterialremovalrateofsoftnessabrasiveflowwasbuild.Themotioncharacteristicofsoftnessabrasiveflowwasnumericallysimulatedintherestrainedchannel,andthematerialremovalabilityofsoftnessabrasiveflowinnearwallregionswasforecasted.Atlast,throughcomparedexperimentwithsimulationresults,bothresultsarewellinagreement,thusvalidityofnumericalmodelwastestedandverifiedinthepaper.Thepaper’smainworkisasfollows.(1)Machiningprincipleandadvantageofsoftnessabrasiveflowwererelatedandanalyzed,modeofactionofsoftnessabrasiveflowintherestrainchannelwasanalyzed,andthePrestonequationofmaterialremovalrateofsoftnessabrasiveflowwasobtained.(2)Geometricalmodelwasbuild,motioncharacteristicofsoftnessabrasiveflowintherestrainedchannelwasnumericalsimulated,andtheremovalabilityofmaterialofsoftnessabrasiveflowinnearwallwasforecasted.Throughreasonabledesignandassemblingofrestrainedmodule,thematerialremovalratecurveofsoftnessabrasiveflowinnearwallregionwasobtained,inordertoimprovethequalityofworkpiecesurface.(3)Experimentplatformthatwasappliedtopolishthemouldstructuralsurfaceusingsoftnessabrasiveflowwasbuild,atlast.Theresultstestthefeasibilityandvalidityofsoftnessabrasivemachining,aswellasshowvalidityofnumericalsimulation.andatheoryapproachtoresearchtheregularityofsoftnessabrasiveflowissupplied.IIIKeyWords:softnessabrasiveflow,mould,precision,volumeoffluidmodel,simulationIV.....................................................................IABSTRACT................................................................II...............................................................11.1........................................................11.2......................................................11.3..................................................31.4..................................................71.4.1..............................................71.4.2................................81.4.3..............................81.5................................................9...................................102.1.......................................................102.2...........................................................112.2.1...............................................122.2.2...........................................132.3...............................................142.3.1.................................................142.3.2.....................................................152.3.3.....................................................152.3.4.....................................................152.3.5...............................................162.3.6...............................................162.3.7.....................................................162.4.....................................................162.4.1k................................................172.4.2RNGk.................................................182.5.........................................................182.5.1u.....................................192.5.2k.........................202.5.3...................................................20V2.6...........................................................22....................................233.1.........................................233.2...........................................253.3(Preston)..............................................263.4...................................................273.4.1.........................................273.5...........................................................283.5.1.................................................283.5.2.....................................................303.5.3.................................................303.6...........................................................31..........................................324.1...............................................................3