TheRapidPrototypingManufacturinganditsapplicationinmoldingmanufacturingAbstract:Bydiscussingtherapidprototypingtechnologythecraftprinciple,characteristicoftheprocesses,formationandthegeneralsituationofthedevelopoffastprototypeanditsapplicationinmolding,pointoutthetechniquecanformakindofaprocesssystemofextensiveapplicationandnovel,anditsforegroundisvast.KeyKKKWords:rapidprototypingtechnology；moldingmanufacturing；developmentofproductRapidprototypingtechnologyisanewtypeofmultidisciplinaryintegratedmanufacturingtechnology.Afterthe1980s,followingtheapplicationofcomputer-aideddesign,productshapeanddesigncapabilitieshavegreatlyimproved,however,productdesignhascompleted,production,asystemmustbedesignedtoconveytheconceptofsamples,rapidfeedbacktoproductdesign,productdesignandassessthefeasibility,andfeasibilitystudies.Theincreasinglyfiercecompetitioninthemarkettoday,thetimeiseffective.Toenhancethecompetitivenessofproducts,fromproductdevelopmenttovolumeproductionofthewholeprocessareurgentlyrequiredtoreducecostsandincreasespeed.Rapidprototypetechnologyappearanceprovidesaneffectivesolutiontothisproblemwhichmuchattentionathomeandabroad.1.ThebasicprincipleofRapidPrototypingTechnologyTheRPisthegenericnameoftheprinciplecreationproductprototypethatusesthelong-lostlayering,itsprincipleis:ProduceCADmodelStratifiedseparatedaccordingtotheplangeometryinformationwhichisdispersedtopileuptheoriginalmaterialgeneratingentitymodels.Thistechnologyintegratesofcomputertechnology,laserprocessingtechnology,newmaterialtechnology,relyingonCADsoftwareinthecreationof3Dcomputermodelsentities,andisdividedintoaseriesofplanegeometryinformationtocontrolthescanninglaserbeamdirectionandspeed,usingsinter,poolingorchemicalreactionmeansexhaustiveselectiveprocessingofrawmaterials,thusrapidaccumulationmanufactureproductsentitiesmodels.2.ThecharacteristicsofRapidPrototypingTechnologyRapidPrototypingTechnologybreaksthetraditionalwaytoproducesparepartsof“roughcastslicetoparetoprocessfinished”,Needlesscutlerycreatedthefirstproductionofspareparts,isanunprecedentedlaminareducingprocessingmethods.Comparingtotradition,thefastprototypeprocessesthefollowingadvantage:(1)Producethesparepartsofthecurvedfaceandmorecomplicatedappearancequickly,suchasshoulderwithinsparepartsandhollowandpartsofetc.s,consumedlyloweredthedevelopmentcostofthenewproductanddevelopmentperiod.(2)Isanon-contactprocessing,machinetoolcuttingprocessingisnecessarycutleryandjigwithoutcutlerywearandcuttingforce.(3)Withoutvibration,noiseandslicetoparethewaste.(4)Cancarryoutthenighttimeoverfull-automaticproduction.(5)Processwithhighefficiency,producesthearticleentitymodelandmoldingtoolsquickly.TheformfollowsthecomparisonofthemethodfortheRapidPrototypingTechnologyandtradition.ComparisontheitemProcessingtechnologyThetoolmachineslicestoparetoprocessRP(Lightshapemethod)processThemethodofprocessDoawaywiththesurplusmaterialprocessFoldthelayerprocessTheobjectofprocessSolidLiquid,portrait,powderToolThetoolofslicetopareLightbeamMinimumprocessingunitsDotsdiameterisabout1msTrianglesof200mslongProductionofsparepartsTheleastprocessescometogetherthebodyoftheunitTheleastprocessescometogetherthebodyoftheunitTheRPandtraditionsslicetoparethemethodcomparisonsheet3.ThedevelopofRPRapidprototypingtechnologyconceptthattheconceptRP(RapidPrototypingTechnology)couldbebackto1979.theprofessofZhongChuanWeixionginproduceandtechniqueinstituteofJapaneseUniversityofTokyoinventthemethodoffoldthelayermodel,theXiaoYuXiunanputforwardthelightshapemethodagainin1980,aftertheconceiveputforward,itwascontinuedtostudyin1984byWanGuYanger,andcarriedontoproducemanufactureonatrialbasisin1987.1988,theUnitedStatesrapidlyprototype3DSystemsCorporationwasthefirsttointroducepracticaldevices-laserthree-dimensionalshapesthatSLA(StereoLightgraphyApparatus),andannualsalesgrowthrate30%40%increaseintheworldmarket.Inrecentyears,withincreasingperformancescanning-amirror,andthedevelopmentofmaterialsscienceandcomputertechnology,rapidprototypingtechnologymatures,andin1994topromoteuniversalaccesstotheformalstage.Inaccordancewiththepatternsandmaterialsusedinthedifferenttypesofrapidprototypingtechnologycurrentlyhasthefollowingfourtypes.3.1SolidificationresinmaterialsusinglaserlightshapeslawThelightshapeequipmentisexcellentwithaproductofthe3DSystemscompanyoftheUnitedStates,andtheformationofamonopoly.Figure1showstheoperatingprinciples.Issuedbythelaserlight,theopticalsystemtocompileintoasmallbeam,thebeaminthecomputercontrolled,selectivescanningresinsurface,usinganultravioletresinFrozenmechanisms,alayerofsolidificationresin,eachlayerofsolidification,precisionworkstationsinadistancewiththenewlayerofsurfacegeometricinformationtothelaserscannerforscanningreading,solidificationofthenewlayerofresinandfirmlysticktothepreviouslayerhassolidificationresin,sorepeatedlyuntiltheproductionofsparepartsentitiesgeneratedamodel.Thelaserstereoscopicshapemanufacturingaccuracycanreachthe0.1mms,mainlyusedtoprovidethesampleandtheexperimentmodelsfortheproduct.Inaddition,theSOLIFORMoftheJapanesesystemmachinedevelopedcanmanufacturetoinjecttomodelthemoldingtoolandvacuummoldingtoolsdirectly.Figure1Stereoscopiclightshapetechniqueprinciplediagram3.2ThepaperfoldsthelayershapemethodThepaperfoldstheLOMthatthelayershapemethoddevelopswiththeHelisyscompanycurrentlyapplicantmostwidely.Thedevicesusedforrollerpaperfromthepaperheatingrollercylindersconnectivity,andthenusingthelasertocutpaper,thequestionheatingrollercylindersautomaticallyleave,thepaperwillbereadybylaserlevelrequirementsintoshape,asshowninfigure2.Figure2PrinciplediagramofthepaperfoldsthelayershapeTheLOMcanmanufacturesomelargesparepartsandthethickwallkindpiecesofthehardcreationwithlightsshapemethodandcreatecostischeap(aboutforthelightshapemethodof1/2),thespeedishigh(aboutmanufacturetimeforthewoodmoldofbelow1/5),andcansimplyanalyticthedesignconceiveoutlineandfunction.3.3meltdownshapemethodsThemeltdownshapemethodismostextensiveusedwiththeproductFDMwhichisdevelopedinAmericanStratasys,(theFusedDepositionModeling),whenitisworking,theplasticsmaterialwithhotextrusionsprayeddirectlybysprinklerheadcontrolledbycomputercombinetolayertocreateanentitymodelfrombottomtotopaccordingtoseveralinformationoflevel.ThebiggestcharacteristicsinFDMtechnicalisaquick(generalthemodelneedseveralhoursandcanimmediatelymodel)andfreefrompollution,togettheextensiveapplicationinprototype,developandcastwaxmoleandsoon.3.4hotandfictileshapemethodsThehotandfictileshapemethodburnstheknotwiththeselectivitylaseroftheDTMcompanydevelopmentnamelytheSLS(theSelectiveLaserSintering)applicationisthemost.ThatmethodisawaymanufacturekindpiecethatburnswiththeCO2lasermachinecontrolsbythecalculator,carryonscanningonthematerialpowderaccordingtoseveralinformationforfacesofseveralpieceswithhorizontaleachlayerofthebody,thepowderisscanningbylaserandsolidifytogether.Then,spreadupanewpowderoflayer,thenscantoburntheknotwiththelaser,thusagainandagain,keeptogotomakethekindpiecewhichneeded.Asfigure3shows.Figure3TheprinciplechartofselectivitylasersinteringTheSLStechniqueshapespeedisfast(generalware,needoneortwodaystocomplete),theshapeaccuracyishigh(theminimumthicknessofeachlayerpowderisabout0.07mms,thelaserdynamicstateaccuracycanreachthe0.09mms,andhavetheautomaticlaserrepairfunction),theprototypestrengthishigh(gatheritsbentstrengthofthecarbonicacidfatandcanamounttothe34.5MPa,thenyloncanreach55MPa),therefore,cancarryonfunctionsexperimentandassembletheemulationwiththeprototype,toobtainthebestcurvedfacetomatchwiththeobservationthecondition.DevelopandappliedaspecttechnicallyinRP,theUnitedStatesandJapansarethebest.InHuazhongUniversitydevelopstwokindsofmodelsystemmachineHRPandRPSswhichisresearchtomanufacturein1994successfulquickly,havealreadyenteredthecommoditymarketcurrently,beappliedintheprofessionsextensively,suchasautomobile,toy,aviationaerospace,shipbuildingandthesoldierworketc.4.TheapplicationoftheRPinmoldingmanufacture4.1MakingthemoldfoundryfastPutthesparepartCADmodelconversetofastmethod,producemetalsparepartsquicklyaccordingtoeachlayershapeoffacetoforceramicmoldandthenaccordtofastmethod.Inaddition,cancar