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CHINESEJOURNALOFMECHANICALENGINEERF»GVol.18,No.4,2005.609.YuTOngminLiGUanhUaDESIGNTECHNOLOGYFORINJECT10NMOLDRARTINGSURFACEBASEDONCASESANDKNOWLEDGELIYbUminAbstractonthebasisoftheeomPrehensiveanalysisabouttheautomatiegenerationoftheinjeetLanJianKeyLaÏratoryforPødsionandNontraditionalMaehiningfehnologyofMiniatryofEducaUon,DßnUniVetyofTeChnologÓDalian116024,Chinalonmo,dpartmaJŠò¿ce,thePartingsurface¼mathod.whiØhaduce5aoWleÒødcëse£basedreasonmgCBRmtothecomPteralaeadeslgn15aescnDeooyeomolnmgwitntncacua,eharaeteristieininjeetionmolddesign,andthedesignProeessofeaseBbasedreasoningmethod15alsogiven.AeaselibraryIneludingtheIntormatlonorPartlngsurjaeeB5ouBrwBtntnemaexormainshaPefeatÅes.Theautomatiedesignofthemo1dPartingsurfaceisrealizedeombinedwiththeforÇardBreasoningmethodandthe517larity50utionproeedure.Theruleknowlelelibrary15alsoimProved.KeywordsInjeetionmoldPaIntingsuricedesignCaseBbasedreasoningCBRSimil°tysolution0INTRODUCTIONBeingoneoftheimPortantstePsininjectiontheehoieeofPartingsurfaeehasandireetlyefeetmolddesign,onthegeneralframedesi¹.moldmakinZeost,thepÓinºsurfaeemaehiningandthequalltyottnetlnalPlasncPartsmBmcbotneratlonalehoosingofthePartingsurfaee15thePreeonditionofasueeessfulinjeetionmolddesignandthebasisofrealizinginjeetionmoldingPartantomatieandsoPhistieateddesign.Inreeentyears,researehworkonthePartingsurfaeeandmoldeomPonentsautomatieallygeneration15oneofthehotsPotsanddifieultiesintheinjeetionmoldingCADfield,andmanyreseafchersaroundtheworldhavedoneremarkableworksabout1FRAMEVVORKOFKNOWLEDGEANDCASEBASEDREASONINGPARTINGSURFACEAUTOMATICDESIGNthisissue.ButthosePriorworkstendtoeshaPeanditsPositionrelationsofPrtingsXPrCSurfacSSeonstrUetingsomebumericalmodelsbasedonthegeometryallBaroundbytheessentialanalysisofthePlastiePartn5shapestruetureeomPlexityofPlasticPkindsofshortcomingsinPracticec2B5.Duetothediversityandts.thosemethodsh8VesomeWithmuehexPerieneeandlitletheoryformoldingdesign,thePartingsurfacedesignmethodWhiehintrodueesknowledgeandeaseBbasedreasoningCBRintotheeomPuterBaideddesign15PresentedbyeombiningwiththedesignProeessofinjeetionmoldingdesign,50thatthemoldingPartseanbegeneratedautomatieally.KnowledgeandcaseBbasedreasoningmeansPlying517IarityjudglnentProeedureandanalogismtohandleanewdesigntaskbyeonstruetingknowledgelibraryandeaselibraryandresPectivereasoningruleonthebasisofeombtheknowledgeødruleofPartingsurfacedesi´SueeessfulenglneersPrineiPlesueeessfulaPproachdesiz¿sÑoPdthòsucce,²oxPenencTorgan1CallymB,tnlsmenewQeSlgnnotonly¥dofTfitsofmoldPartingsurfaeebutalsoineludestheexPerieneeofthosefonnereasesAsaresult,this15moreeonvenient,quiekandPraetiealefeetivecomParedtoanalysisandsolvingthePartingsurfacedesignbyconstrUetingnumeriealmodel.FUrnthermorethedeseriPtionofPartingsurfaeedesignexPerieneesareeasilyexPressedbythecasesratherthantheabstraetdesignrulesandexPressions.50theknowledgeandeaseBbasedreasoningPartingsurfaeedesignmethod15verysuitableformoldengineern5thoughtfashionand118lner.ReeeivedMay26,2004receivedinrevisedformAugUst17,2005aeeePtedAugust30,2005ThegeneralideaofknowledgeandcaseBbasedreasoningPaltingsurfaeedesign15tofoundaeaselibraryusingsuceessfulPartlngsurfaCedesignsintermofmoldedPartsntyPesandgeometriecharaeter.ThemainshaPefealiresofmoldedP\areindexesofthislibrary.AftersearchingthesimilareasewiththePart,smainshaPefeaturefromtheeaselibrary,thePartingsuriùeecanbegeneratedbyjudgingfromthesimilarityprineiPleandthegivenreasoningstrategy.Atthesametime,theeorrelativeknowleÈeandPrineiPlesofPartingsurfaeedesignandthedesignern5exPerieneeseanbesunnnarizedintoknowledgelibraJ,whieheanbequeriedandconsultedbydesignersastheassistantinformationofPartingsužùeedesign.TheeaseeomPonentofthemethod15usedforthereasoningdesign,whiletheknowledgeonefortheguidaneeofdesignern5rationalseleetionofPartingsuriùce,TheknowledgeandcaseBbasedreasoningPartingsurfaeedesiùmainlyeonsistsofthefollowing¹Construetingknowledgelibrö/.Ai7ngatthePracticeofinjeetionmoldingdesign,aknowledgelibraryofPartingsurieedesignrules15foundedthrougheoneludingandintegratingtherelatedÂowledgeandrulesofPartingsUrfaeedesignandthedesignersnexPerienees.ºConstruetingeaselibraryofpartingsurfaceposition.AeaselibraryofParntingsurfaeePosition15eonstruetedbasedonthetyPesofmoldedPartsandthePrevioussuceess7designeases,whieheonsistsofthedeseriPtionofeasesandthestruetUreofcaselibrary,ThekeyofdeseribingthePositionofPÓingsurface15tosortandorganizetheshaPefeaturesofcasemodelsanddeternunetheeoresPondlngPositonofPÞngsurfaceaceordingtothevariantsheofmoldedParts.BeeausethePartingsurfaeePosition15mainlydetenninedbythePart,5shaPefealÏre,theorganizationofeaselibraryshouldbeProPitioustotheeasesearchingindesiùnroeess.»xdentifieationofmoldedpartnsshaPefeature.TheshaPefeatUresoforiginalPartshouldbeidentifiedbeforedetenòIningthePositionofPartingsurfaee.Therefore,themainshaPefeatÅesindexneedtobefoundedaimingatthetyPeofmoldedPartstruetureThustheseatnlessjointbetweenmodelingmeldedPartanddesignmoduleofmoldPBþngfaceoanberealized.Asaresult,theheritedcharacteristieofsystem15alsoimProved.¼Systemreasoningandsearehingmodel.SearehingandmatehingthesimilarshaPe.610.’tttti´ÏŠ´¹technoloforinjeetionmoldpartsurfacebasedonCaseSandknowledgefoatureofPartmodelfromthePartingsurfaeePositioneases15thePrimarytaskofthePartingsurfaeePositionease,5searehingRecommendedstyleUnadyBsablestyleeourse.HeneebuildingtheshaPefeatureindexodmodel15eoretorealizeexaetease½AutomatiegenerationreasoningandquieksearchtheingaofPartingsurfaee.AfterPerformingdesignmarehingandadjustingabouttheseleetedPartingsurfaeePositioneasewhieh15517lartotheshaPefeatureofmoldedPart,theneededmoldPartingsurfaeeeanbegeneratedautomatieally.¾storageofeases.ThoabunÓnteaselibrofPartingsurfaeePosition15theimPortantfoundationtoimprovethedesignqualityofmoldPartingsurfaceandreasoningefieieney.ThesystemProvidesstoragejudgmentandseleetionbasedonelassifieationbyeasefeaturesaboutthefinallyresultofeaehnewdesigntask.TheflowehartofknowledgeandeaseBbasedreasoningPÓingsurfaeedesigning15showninFig.1.Fig,2DemonstitionoftheknowledgelibraryofPartingsurfaeedesignModelpartfe¶sFeatureldendôcationMaFhingÉm{Fsindexedčshapemdthecasemodel}Caselib²bf51ÿjlarsimilartothe}part,ŸÜåeportsbýe1po.lmBonDe1runethePÓingsurÓceusingsimil0ty501Åbbp»ed¶ebùaontheeg°þhgbdel¦¦dtothecmlibmryofpÜÂg,WÓcepositonThePartingsurfaeedesignmainlyhasrelationtothemainshaPefeatureofmoldedPart,andtheidentifieationofthemainshýefeatUrealsoPlaysaleadjngroleöneasesearching,I—öjsregard,thestrUetUreofeaselibraryshouldbeorganizedaeeordingtotheshaPefeatureofPart,andthehierarehiealfeaturetreeofmoldedPartshouldbeeonstrueted,bywhiehtheparteaseseanbeelassifiedstored.ClassifyingtheshaPefeatUresofPartsbytheirdiferenteharaeters,theeommonfaetorsofPartmodeleanbeextraetedastheParentnode.TheehildnodeeaninheritallofatributesFmtheParentnode,andeontainmorefeaturestliantheParentone.Asfarasasingleease15eoneerned,alongwiththeinheritedrelationgoingthroughlayerbylayer,thenumberoffeaƒeatributeswillinereaseThefeatureatrlbutesaremoreaPttodeseribingeoneretelyandbyinstanee,andtheeomPlexdegreeoftheirrelations15alsoinereased.ThiselassifiedýProaeheanhelPtosearehtheeaselibrBindexedbyshaPefeaFresandtosolvethemodedPÝwitheomPlexshaPe.33.1CASEDESCRIPTIONSANDSEARCHINGCasedeseriPtions2BUILDINGOFKNOWLEDGELIBRARYANDCASELIBRARYTheknowledgelibrary15theilnPortantresourcethateanassistdesignertoseleetrationalPartingsurfaeePosition.TheorganizationanddeseriPtionofÂowledgeinthelibraryshouldfitforthePraetiealmolddesignProeessandeanbeeasilyqueriedandeonsultedbydesigners.Therefore,theeommonusedknowledgeandPrineiPlesinPartingsurfacedesignandthedesiguersnsueeessfulexPerieneeswereeoFludedandintegrated.SomePieeesofdesignrulesknowledge,whiehformtheknowledgelibraryofPartingsurfaeedesign,werestablishedandwereidentifiedbysimPlesentenees.AllofthedesignrulesinlibraryweredeseribedandexPressedindetailbyfigureandleter.Andtheelue15alsogiveninoreeol—n1endedn,andonotrecommended,nwaysinthefigureeomPonentofdesignrules,whieheanhelPthedesignümaketherationalselecþjonbasedonPartieulardesignease.Fig,2showsthePartingsurfaeePositiondeseriPtiongivenbythesystemafterehoosingoneofthedesignrulescTheeasedeseriPtion15thefoundationtoPerformaknowledgebasedreasoning,whiehtumstodeseribeanexistedsuceessfuldesigneaseasthedatainformationthateanbeidentifiedandProcessedbyeomPute¥TheeontentandthedeseriPtivewayshaverelationwiththequalityandefieieneyofsolving517Iarquestions.TheeasedeseriPtionmaybeexPressedinthefollowingmode,easeofthemoldedParttheindexinformationPositioninfon—ationofPartingsurfaee,wheretheindexinformation15theshaPefeatureofthePart.NamelytheshaPefeatoreofPartasanindexeansearchthesimilareasewiththemainshaPefeature,andtheresPeetiveParntingsurfaeePosition15alsogiveninthisease.ThustheeasesinPartingsurfaeePositioneaselibraryaresometyPiealPartshaPeandtheeoresPondingPartingsurfaeePositiononthePartmodel.ThenumeriealdeseriPtion15easeF3easeÀ,.,l,ª,sJ,,l,mwhereFÀ,.,,¦,115theehildshaPefeatureintheinjeetionmoldingease,i1,2,l,n,n15thenumberofehildfeaturesintheease,SsB,52,l,sb,sj15thesolvingscheme,i.e.thePartingsurfaeePosition.j1,2,l,m,|15thenumberofavailablePartingsurieepositionofoneeasemodelcAhierarchiealeaselibra,whieh15showninFig3,eanbeformedaeeordingtothenumberoftheshaPefeaturesineases.AndthenextayereontalnsonemoreshaPefeatUrethanthefonòerone.ItdeveloPstheshaPeinformationofeasemodelonthebasisofinheritingtheformerlayern5shaPefeatures.Fig4showstheorganizingsehemeofeomPlexeases.Theseheme15eonsisteniwiththemodelProeessofmoldedPart,thusit15convenienttoPerformingeasesearehingindexedbytheshýefeatijre.3.2HierarchicalsearehingbasedontheProduetruleCasese¿hing15animPortanteomPonentinreasoningmeehanism.Theesseniialofsearehing15theProeessofsearchingandmatohing.50theProeessofeonstrue§inginfereneemeehanCHINESEJOURNALOFMECHANICALENGINEERING.611.ism15alsotheProcessofeonstIuetingthesearchingstrategiesandmatchingthesi7lÂties.Thestrategieshaveagteatefeetonthereasoningeficieneyandtheresult.ThePuJJoseofthesearchingofthePartingsurfacePositioncaseistosearchthecasewhichhasthesimilarmainshapefeaturewiththePlastiemodel.Thusthemethod15ProPosedonthebasisofProduetruleaeeordingtotheoÔanjzationalstrUetUreofeaselibrary,Thehierarchiealsearehingmeansthatthecaselibrary15searchedintufromtheheadlayertotheendinthesearehingProeedure,butwhiehembranchmentwouldbefollowedshouldbejudgedfromtheProduetrule.Fig.3sclireofthePartinogrganlzationlmsurfaeePositioneaseibraryùùmPI/atedcalsFig.4organizationstructureoftheeomPlicatedeaseFig.5showsatyPeofladderlŠmoldedPartswiththeladderholefeatUre,whieheanbeobtainedóPerformingBooleansubFetionbetweentwoladdershaftfeatires,andafilledeornerastheassistantfeatire.ThereasoningsearehingProeessis,zstlyPerfo—ngtheôrstjudglnent,iffeature115theladdershaft,thentheease1withladdershaft15obtainedthenPeriþnnlngtheseeondjudgrnent,ifthefeatUre2withladershaftPerforinsBooleansubtraetionwitheaseZ,andthePositionofitseenterline15atthesarneloe«onwiththefonnerones,thentheladdershafteasewithladderholefeatire15obtained.Applyingthisreasoöngmethodeanaeauirehi1efieienev.DecausesearcningalongoneembraneïmentneednottraverseallofeaseinthelibraJ/.lfthereasoningrulesandeasesaremature,thesimilareasewiththeshaPefeatureofthemoldedParteanbequleklyobtainedbyaPplyinghierarehiealsearehingmethodbasedontheProduetrule.Furthennore,duringtheProcessofeaseBasedPartingsuriteeautomatiedesign,theeasemodelneednotresembletheParntmodelentirely.ItonlyneedsthattheirmainshaPefeaturesaresimilarandthepartingsurfaeePosirionsrelativetooneof´nshaPefeaturesofthetwomodelsaresÇIar.The517látysolutionmodelofPartingsurfaeeautomatiegenerating15ProPosedhere.4SIMILARITYSOLUTIONMODELOFPARTINGSURFACEThePartingsurfaeeofaeasehasthesPeeialPositionrelationrelativetoaeertainfeanØe,AndtheserelationsrePresentalwaysonacerntainsurfaee,aeertainseetionorPassingthroughaeertainPointofthefeatÅeete.TþesePositionrelationseanbeexPressedasaZDvectof,thatisP­¸,nwhereƒLBSPeeialPositionrelationíBBBVeetorsymbolCBPoiniofthefealÅewhjehtheP°rtingstlrfaeePassesiNormalveetorofPartingsurieeInotherwords,theParntingsurieeisr†resentedbyanornalveetorandasPeeialPointPofthefeature.ForeachPartingsöeofaeasemodel,veetorX15unebangeable.AsfarasaboardclikePartcasemodel15eoneemed,ifthePartingsurfaee15deternnedonthetoPfaee,thenPointP15theeenterPointofthisFce,and15thenonnalveetor.Firstly,findthePositionrelationPofthePartingsurfaeerelativetotheeasemodel,andthensubstitutethePositionrelationintothePartmodeltodetenmneitsPartlngsurfacePosition.ThesolvingproeesscanbeexPressedbythefollowingexPressionIOpÌc}¥{Op1CPm}wheresPiPartingsurfaeeC7BBBCasemodelOiPartmodel1,FiFeatUrelocatedinCmandPmresPectivelyThelenitemrePresentsthePartieularPositionofPartingsurfaeerelativetoacertainfeatureintheeasemodel,whiletherightonerePresentsthisrelationinthePartmodel.Usingtheir517larityweeandeten—InethePaIntingsurfaceofPartmodel.AcordingtothecotrLPletyofthesFm¸eofthemoldedPts,thepartingsMfedesignlrƒyincfudeseveralasPeCtsasfoUows.lTbePartingÍrface15Plane.ForthosePartswhosemainfeaƒâeface15Plane,oneeanfinddbeetlypointPandveetor.SubstitutingthemintotheveetorexPressionXP,n,thePartingsurcePositionofthePartmoldeanbedetemuned.ForthePartshoÆpinFig.6,thetoPface15seleetedastheParntingsužeeaceordingtotheeasesinthe11bra.ThusPointP15thetoPfaeeeenterPointofthecubiealPartmodel,whilen15thenormalveetorbfë5surÀee,andtheseþ«0valuescanbefoundmomthefeatureöe,50thepositionofPartlngsurfaeecanbe50xvedeonvenientiy.2LadderPartingsuÓee.TheladderPartingfaeefeature15comlnonlyusedinsomemoldedPartsForthePartshownjnFig.7,.612.dTongmin,etalDesi,teChnoloáfotinjectionmoldpartingsurfacobasedoncasesandÂowledgeoneneedfiqtlyfindthevectorsxl,å,l,åofeaehladderfaee,thentheladderPartingsurfaCeeanbeObtainedbyPerforungBooleanunionoPerationwiththePartingsurfaeeseontrolledótheseveetogsurfaee.IntheProcessofthePartingsurfaeeselecting,theknowledgelibrary,theeaseslibrB/,andthefoardBreasoningmethodareused.ThesimilaritysolutionmethodandBooleanÂtooperatlonamø9thechildpartingslRfacesareusedtogeneratethefinalPaZnt1ngsuõÂe.Fig.1015theZDilfustrationofPartingsur1eofthisPartmodel.q3ThePartingsurfaeoiscMrvedface.The501vlngProeess15eomPlieatedwhenthePartingfaee15eurvedfaee.TakethePartshowninFig.8asanexamPle,thekeyfealÅeParameters,suchastheradiusarc,thePOsitionofeenterlineanditsdistribution,shouldbefoundaeeordingtotheshaPeoftheeurvedface.Thenthesolvingmodeleanbeeonstlpcted.AftersubstitUtingtheseParaØbetersintothesolvingmodel,thePartingIineeanbegenerated,andthenthePartingsurfaeealsoebeObtained.IfthePartingsurface15freeBÄwsurface,thesolvingmedelwilbemorecomPlieated4MoldedPartswitheomPlieatedsƒNÅe.ThemoreeomPlieatedPartmodel15theonethatitssimilareasedoesnotexistintheeaselibraryofPartingsurfaeePosition,andtheeasemodelresultedfromthereasoningProeedurealsohasasignifieantdiferenee.Thiskindofeasemodelshouldbesolveddireetlyatthistime,forthegeneralstrUetLireofthePart15eolicated,butthePositionofPartinglinemaybesi7lar.kethePartshowninFig.9asanexamPle,whichconsistsofseveralsFeøefaors,there15notthe517lareaseintheeaselibrary.ButitsPartingfaeealsoeanbedesignedusingthecaseshowninFig.6,andthetoPfaceofthePartwouldbechosenasthePartingsurfacebeeausetheirPositionsofPÞngsurfaeeare517lar.IfthesimilaritysolutionProeeduredoesnotwork,thehumanBeomPuterinteraetionwillbechosentodetnnlnetheb0ip,surfaeeandtheresultwillbestored,thusthecaselibrBofthPartlngsurtacePosltlonw1JIOeenncneQc6CONCLUSIONSTheknowleûeandeaseBbedreasoningdesignofmoldPörtlngsurface15toreasonthe517larcasewiththeoriginalPÓdexedbyÉshaPefeatureoftheparntandtodeterninethePositionofthemoldParntingsëÓeeemPIOyingthe517laritysolutionmethod.ThisýProachhashighdesignefieieneyandreliabilityonthebasisoftheabundantknowleÈelibr–andcaselibrary.ltalsohasseveralcharacteristicsasfollowsIThehieraehiealeaselibrBofPartingsurfacePosition15eonsÂetedbedonthenumberofthefeaøesintheease,whlchmxesthesearebF9rnoreeonvenient.2IndexedótheshaPefeanâe,ahierarchiealsearchingmethod15emPloyedbasedontheProduetrule.IthashighefieieneyandeanquieklyreasonouttheeasemodelwhiehmainshaPefeal¸e15slinilartothemoldedPart.3Usingthe517larityoftheshaPefeaturesbetweentheeasemodelandthePartmodel,thesiëlaritysolutionmodelofPartingsudce15founded,whicheandeten—InethePositionofthemeldPÞngsuricequieklyandexactiy.Asaresult,thequalityandtheeficieneyofthemolddesignareImProved.ReferenCes1zhangYS,WangYZ.ComPuterBAidedDesignofplastieMoldandDiecBeijingChinaMaehineP55,1999InCliinese2FuMW,NeeAYC,FuhJYH.TbeaPPlieationofguxJeevisibilityüdmoldabilitytoPartinglinegeneration.ComPuterBAidedDesign,2002,344694803TanST,YuenMEpartinglinesandPartingsužteesofinjåtionmoldedPOrts.hiProcµdingoftheInstitutionofMechieaIEngine.,1990,2042112214WfngT,Tan5T,SzeW5.Partinglinefonnationbyslieinga3DCADmodel.En4eenngwithComPu­ers,1998,14330435MajhiJ,GuptaP,JþardüRcCgýutio.natest,Ø¿«Bfrepart«linelbraeonvexPolyhe9on,wl9aPPllCanontomolaQeslgn.þbBpuationaiGeomety,1999,13422¢2526SunXM,yangHC,WÂgYJ.R.SarchonthedesiùmÔthodbasedwC7scMeeh´iealSelenceùdlåhoologÊ200,l92331332InChFig.9Part9sud²ceofcomPllcatþPsrt5DESIGNEXAMPLEouralgorithmhasbeenrealizedbyProgram7ngwithVisualConthePlatformofAutoCAD2000.objeetARXse¸5asthedeveloPingtookitbeeauseofitsgreateficieney.Fig.715usedasthetestPartmodel,andtheresultofthedetennlnationofPartingsurfaee15showninthefigure.It15akindoftyPiealladderPartingBiograPhicalnotesYuTong.,m.le,wasbotUD1953,avlceprofes80rinÙyLaboratoryforpreeisionandNonBtraditionalMachiningTechnologyofMinistInyofEdueation,DaiiþUöversityofTee1ology,China.HisreseâehinterestsineludePr6eisi´,mieromolddesignandm´uÓetUng,moldingCAD/CAM/pDM,sfacemodificationandåtionmoldingcºl8611B84706062EmmallhÇn530sohu—omLiGuhua,male,wasbom1979,anMSeandiöteinKeyLaboratoryforPreeisionandNonc.ditionalMaehiningTeehnofogyofMinistryofEdueation,DalianUniversityofTechnology,China.Liþumln,male,wasbomin1981,anMSeandldateinKeyLaboratoryforpgeisionandNonBFditionalMa1iningTeehnologyofMiniszofEducatiÂ,DalianUniversityofTeehaology,China.LanJian,m°le,wasbomin1972,alecturerinKeyLaboratoryforPrecisionandNonBtraditionalMachinngº1nologyofMinistryofEdueation,DalianUniversityofTecFology,Chi».
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