机械设计制造及其自动化专业外文翻译原文Word格式文档下载.docx
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机械设计制造及其自动化专业外文翻译原文Word格式文档下载.docx
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毕业设计(论文)外文翻译
(原文)
院(系):
机电工程学院
专业:
机械设计制造及其自动化
TheInjectionMolding
Thepresentsituationthatthemouldmakesatpresentandtrend
Themoldisatthecoreofaplasticmanufacturingprocessbecauseitscavitygivesapartitsshape.Thismakesthemoldatleastascritical-andmanycasesmoreso-forthequalityoftheendproductas,forexample,theplasticitingunitorothercomponentsoftheprocessingequipment.
Themouldisimportanthandicraftequipment,occupiesdecisivepositioninindustriddepartmentssuchasconsumergoods,electricalequipmentelectron,automobile,aircraftfabrication.Themouldisimportanthandicraftequipment,occupiesdecisivepositioninindustriddepartmentssuchasconsumergoods,electricalequipmentelectron,automobile,aircraftfabrication.Industrialproductpartroughprocess75%,thefinishmachining50%andplasticpart90%willbecompletedfromthemould.TheChinesemouldmarketdemandalreadyreachesscaleof500hundredmillionyuanatpresent.Theautomobilemould,theannualgrowthratecoveringpieceofmouldespeciallywillexceed20%;
Alsopromptbuildingmaterialmoulddevelopment,variousheterotypematerialthemould,wallsurfaceandfloormouldbecomenewmouldgrowthpoint,plasticdoorsandwindowsandplasticdrain-pipeincreasetoexceeding30byintheupcomingseveralyears%;
Thehomeappliancemouldannualgrowthratewillexceed10%;
TheITindustryyearincreases%speedequallyexceeding20,theneedtothemouldaccountsfor20ofmouldmarketplace%.2004annualChinesemachinetoolsimplementsindustryoutputvalue.
Willcontinuetoincrease.Ourcountrymouldfabricationmarketpotentialisenormous.Thebasisdatacounts,inrecentyears,ourcountrymouldyeargrossoutputvaluereaches3billionU.S.dollar,entranceexceeds1billionU.S.dollar,exceed100millionU.S.dollaroutlet.Increasebyfrom25%toincreaseto200550%of1995.Theexpertforetellsthatabroad:
Asiaportionbeingoccupiedbyinmouldfabricationinthewholeworld,willfrom25%toincreaseto200550%of1995.
Chinesemouldindustryhasbeenexpandingbyleapsandbounds,hasformedeastChinaandtwobigSouthChinabases,andhasexpandedgraduallyarrivingatotherprovince.In2002(Shandong,Anhui,Sichuan)in1996,mouldmanufacturingindustryoutputvalueannualaveragegrowth14%,growsby25%in2003.In2003ourcountrymouldoutputvalueis45billionRMB.Thegrossproductplaceoccupiestheworldthe3rd,exportsamouldincreases33.5%comparedtolastyear336,800,000U.S.dollar.But,contentslowourcountrytechnologymouldsalreadypileupinexcessofrequirement,verymostsupportofaccurate,complicatedtopgrademouldimports.Everyyeartheentrancemouldexceeds1billionU.S.dollar.Exceed100millionU.S.dollaroutlet.
Precisemouldaccuracyrequiresthat3mums,large-scalemouldsrequirethat8000satisfiedkNagreewellwithmodelforceinjectionmachinerequestin2~;
Theminitypemouldneedstherequestsatisfyingthediameter1mmsilentstocktube.Atpresent,adoptquick-cuttingtoproduceamouldalreadybecomingthegeneraltrendthatthemouldmakes,afewmouldshaveproducedamanufacturerinabroad,high-speedmachinetoollargeareahassubstitutedtheelectricsparkmachinetool,quick-cuttinghasimprovedthemouldefficacygreatly.Machinetoolenterpriseaimsatmouldmanufacturingenterprises,sometreatingcentres60%allaboveofthemachinetoolproducingafactorysellstreatingenterprisetoamould.Themouldfabricationenterprisesubstitutingtheelectricsparkfinishmachiningmouldgraduallyinabroadhasadoptquick-cuttingalreadycommonly,quick-cuttinghasproducedamouldalreadybecomingthegeneraltrendthatthemouldmakesgradually,hasimprovedthemouldefficacyandmassgreatly.Adoptquick-cuttingtoreplaceelectricsparkproducingamould,cangetonthestickobviously,improvesmouldaccuracy,lifetimegrowing.
1.TheIntroductionofInjectionMoulds.
Plastic,whichisoneofthemostversatileinthemodernage,iswidelyusedinmanyproductsthroughouttheworld.Duetoitsabilitytoproducecomplex-shapeplasticpartswithgooddimensionalaccuracyandveryshortcycletimes,injectionmouldinghasbecomethemostimportantprocessformanufacturingplasticpartsintheplasticindustrytoday.However,thecurrentplasticsindustryisundergreatpressure,duetotheglobalizationofthemarket,theshortlifecycleofproductdevelopment,increasingproductdiversity,highdemandofproductquality.Tomeetsuchrequirements,itisveryimportantforthistradetoadoptvariousadvancedtechnologieswhichincludeinformationandInternettechnology,CAD/CAE/CAMintegrationtechnology,concurrentengineering,artificialintelligence,andsoon,toeffectivelyaidthedevelopmentofinjection-mouldedproduct.
Ininjectionmoulding,thedesignofamouldisofcriticalimportanceforproductqualityandefficientprocessing.Inmostcases,qualityofmouldisresponsiblefortheeconomicsoftheentireprocess.Injectionmoulddesigninvolvesextensiveempiricalknowledge(heuristicknowledge)aboutthestructureandfunctionsofthecomponentsofthemould.Nowadays,moulddesignfaceswithincreasingdeadlinepressuresandthedesignitselfispredominantlybaseduponexperienceofthemoulddesigner.Moulddesignersarerequiredtopossessthoroughandbroadexperience,becausedetaileddecisionsrequiretheknowledgeoftheinteractionamongvariousparameters.Unfortunately,itispresentlyimpossibletocoverthegrowingdemandforsuchexperienceddesigners.Therefore,intelligentCADtoolsthatcanassistinthevarioustasksofthemoulddesignprocessareveryimportanttotheproductivityofthemould-makingindustry.
ThegrowingtrendinglobalmanufacturingistoalargeextentsupportedbyInternet,informationtechnologiesandglobalmarketing.Nowadays,itiscommontoseethatdesign,manufacturingandfinalassemblyofaproductaremadeincompanieslocatedindifferentpartsoftheworld.Thevariouspartiesconcernedwouldneedtosharetheirexpertiseandexperiencesduringtheproductdevelopmentprocess.ThecurrentprogressofInternetandinformationtechnologiescanprovideasolutiontosupportandfacilitatecollaborativeproductdevelopmentsamongdifferentgeographicallydistributedenterprises.DevelopinganInternet-basedintelligentmoulddesignsystemasoneofthemoduleofacollaborativeproductdevelopmentsystemcanprovideaneffectiveandfeasibletooltoaidthecollaborativedevelopmentofinjectionmouldsinthesmall-andmedium-sizedenterprisestosatisfythestringentrequirementsofnowadayscompetitiveglobalmarket.
ThispaperpresentsanInternet-basedintelligentmoulddesignsystemusingInternettechnologyandknowledge-basedapproach.Thesystemcanshortenthedesigncycleofinjectionmouldandcaneffectivelyaidthedesignanddevelopmentworksofinjectionmouldsinthesmall-andmedium-sizedenterprisestomeettheincreasingpressureofthecurrentcompetitiveworldmarket.Therestofthepaperisorganizedasfollows.Section2givesabriefintroductionofinjectionmoulddesign.Section3introducesearlierresearchworksonmoulddesignandrelatedfields.ThearchitectureoftheInternet-basedmoulddesignsystemispresentedinsection4.Theknowledge-basedpartofthemoulddesignsystemisdescribedinsection5.Section6discussesthedevelopmentofthesystem.
2.Injectionmoulddesign
Thebasicfeaturesofaninjectionmouldconsistofcavitynumberandlayout,feedsystem,coolingsystem,ejectionsystemandmouldconstruction.
2.1.Designrules
Therearemanyrulesfordesigningmolds.Theserulesandstandardpracticesarebasedonlogic,pastexperience,convenience,andeconomy.Fordesigning,moldmaking,andmolding,itisusuallyofadvantagetofollowtherules.Butoccasionally,itmayworkoutbetterifaruleisignoredandanalternativewayisselected.Inthistext,themostcommonrulesarenoted,butthedesignerwilllearnonlyfromexperiencewhichwaytogo.Thedesignermusteverbeopentonewideasandmethods,tonewmoldingandmoldmaterialsthatmayaffecttheserules.
Amoulddesignprojectnormallystartswitheconomicconsiderations,namelythequestionofhowmanypartscanandshouldbeproducedinonemouldinoneshotinordertomeetthedeliverydateandotherrequirements.Thisisfollowbyconsiderationofthearrangementsofthecavitiesinthemouldframe,whichmightdirectlyincludethoughtsontheeaseofejectionandsubsequently,theconnectionbetweenmouldingsandrunnersandpartquality(number,positionandshapeofgates).Thefeedsystemaccommodatesthemoltenplasticmaterialcomingfromtheinjectionnozzleofthemouldingmachineanddistributesitintoeachcavity.Toremovetheheatfromthemoulding,itisnecessarytoprovidethemouldwithacoolingsystem.Afterthemouldinghassolidifiedandcooleddown,ithastoberemovedfromthemouldbytheejectionsystem.Mouldisnormallyconstructedbystackingseveralmetalplatestoformarigidbody.Ithastohousevariousmouldcomponentsincorrectpositionsfortheproperfunctioningofthemould.Mouldconstructionnormallyinvolvestheselectionofmouldbasesandstandardmouldparts.Forcomplicatedplasticparts,someothermechanismssuchasslides,unscrewingdevice,etc,mightalsobeinvolvedinthewholemouldstructure.
2.2.MoldMaterial
Dependingontheprocessingparametersforthevariousprocessingmethodsaswellasthelengthoftheproductionrun,thenumberoffinishedproductstobeproduced,moldsforplasticsprocessingmustsatisfyagreatvarietyofrequirements.Itisthereforenotsurprisingthatmoldsca
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