会员注册 | 登录 | 微信快捷登录 支付宝快捷登录 QQ登录 微博登录 | 帮助中心 人人文库renrendoc.com美如初恋!
站内搜索 百度文库

热门搜索: 直缝焊接机 矿井提升机 循环球式转向器图纸 机器人手爪发展史 管道机器人dwg 动平衡试验台设计

   首页 人人文库网 > 资源分类 > PDF文档下载

外文翻译单浇口优化注塑模英文版.pdf

  • 资源星级:
  • 资源大小:306.22KB   全文页数:7页
  • 资源格式: PDF        下载权限:注册会员/VIP会员
您还没有登陆,请先登录。登陆后即可下载此文档。
  合作网站登录: 微信快捷登录 支付宝快捷登录   QQ登录   微博登录
友情提示
2:本站资源不支持迅雷下载,请使用浏览器直接下载(不支持QQ浏览器)
3:本站资源下载后的文档和图纸-无水印,预览文档经过压缩,下载后原文更清晰   

外文翻译单浇口优化注塑模英文版.pdf

JournalofZhejiangUniversitySCIENCEAISSN1673565XPrintISSN18621775Onlinewwwzjueducn/jzuswwwspringerlink.comEmailjzuszjueducaLfefal/JZhejiangUnivSciA20078710771083SinglegateoptimizationforplasticinjectionmoldLIJiquan十,LIDequn,GUOZhiying,LVHaiyuanDepartmentofPlasticityTechnology,ShanghaiJiaoTongUniversity,Shanghai200030,ChinaEmailhutli163.cornReceivedNov.22,2006revisionacceptedMar.19,20071077AbstractThispaperdealswithamethodologyforsinglegatelocationoptimizationforplasticinjectionmold.Theobjectiveofthegateoptimizationistominimizethewarpageofinjectionmoldedparts,becausewarpageisacrucialqualityissueformostinjectionmoldedpartswhileitisinfluencedgreatlybythegatelocation.Featurewarpageisdefinedastheratioofmaximumdisplacementonthefeaturesurfacetotheprojectedlengthofthefeaturesurfacetodescribepartwarpage.Theoptimizationiscombinedwiththenumericalsimulationtechnologytofindtheoptimalgatelocation,inwhichthesimulatedannealingalgorithmisusedtosearchfortheoptimum.Finally,anexampleisdiscussedinthepaperanditcanbeconcludedthattheproposedmethodiseffectiveKeywordsInjectionmold,Gatelocation,Optimization,Featurewarpagedoi10.1631/jzus.2007.A1077DocumentcodeACLCnumberTQ320.66INTRODUCTIONPlasticinjectionmoldingisawidelyused.complexbuthighlyefficienttechniqueforproducingalargevarietyofplasticproducts,particularlythosewithhighproductionrequirement,tighttolerance,andcomplexshapes.Thequalityofinjectionmoldedpartsisafunctionofplasticmaterial,partgeometry,moldstructureandprocessconditions.Themostimportantpartofaninjectionmoldbasicallyisthefollowingthreesetsofcomponentscavities,gatesandrunners,andcoolingsystem.LamandSeow2000andJinandLain2002achievedcavitybalancingbyvaryingthewallthicknessofthepart.Abalancefillingprocesswithinthecavitygivesanevenlydistributedpressureandtemperaturewhichcandrasticallyreducethewarpageofthepart.Butthecavitybalancingisonlyoneoftheimportantinfluencingfactorsofpartqualities.Especially。theparthasitsfunctionalrequirements.anditsthicknessesshouldnotbevariedusually.ProjectNo.50675080supportedbytheNationalNaturalScienceFoundationofChinaFromthepointviewoftheinjectionmolddesign,agateischaracterizedbyitssizeandlocation.andtherunnersystembythesizeandlayout.ThegatesizeandruIlllerlayoutareusuallydeterminedasconstants.Relatively,gatelocationsandrunnersizesaremoreflexiblewhichcanbevariedtoinfluencethequalityofthepart.Asaresult,theyareoftenthedesignparametersforoptimization.LeeandKimrl996aoptimizedthesizesofrunnersandgatestobalancerunnersystemformultipleinjectioncavities.Therunnerbalancingwasdescribedasthedifferencesofentrancepressuresforamulticavitymoldwithidenticalcavities.andasdifferencesofpressuresattheendofthemeltflowpathineachcavityforafamilymoldwimdifferentcavityvolumesandgeometries.Themethodologyhasshownuniformpressuredistributionsamongthecavitiesduringtheentiremoldingcycleofmultiplecavitiesmold.Zhaieta1.2005a1presentedthetwogatelocationoptimizationofonemoldingcavitybyanef前一cientsearchmethodbasedonpressuregradientPGSS,andsubsequentlypositionedweldlinestothedesiredlocationsbyvaryingrunnersizesfor维普资讯http//www.cqvip.com1078L,ea1./dZhejiangUnivSciA20078710771083multigatepartsZhaieta1.,2006.Aslargevolumepart,multiplegatesareneededtoshortenthemaxi.mumflowpath,withacorrespondingdecreaseininjectionpressure.Themethodispromisingforde.signofgatesandrunnersforasinglecavitywichmultiplegates.Manyofinjectionmoldedpartsareproducedwithonegate.whetherinsinglecavitymoldorinmultiplecavitiesmold.Therefore.thegatelocationofasinglegateisthemostcommondesignparameterforoptimization.AshapeanalysisapproachwaspresentedbyCOHrbebaisseandGarcia2002,bywhichthebestgatelocationofiniectionmoldingwasesti.mated.Subsequently,theydevelopedthismethodo1.ogyfurtherandappliedittosinglegatelocationoptimizationofanLshapeexampleCourbebaisse,2005.Itiseasytouseandnottime.consuming.whileitonlyservestheturningofsimpleflatpartswichuniforii1thickness.PandelidisandZour1990presentedtheopti.mizationofgatelocation.byindirectqualitymeasuresrelevanttowarpageandmaterialdegradation.whichisrepresentedasweightedsumofatemperaturedifferentialterm.anover.packterm.andafrictionaloverheatingterm.Warpageisinfluencedbytheabovefactors.buttherelationshipbetweenthemisnotclear.Therefore,theoptimizationeffectisrestrictedbythedeterminationoftheweightingfactors.LeeandKimrl996bdevelopedanautomatedselectionmethodofgatelocation,inwhichasetofinitialgatelocationswereproposedbyadesignerandthentheoptimalgatewaslocatedbytheaacentnodeevaluationmethod.Theconclusiontoagreatextentdependsmuchonthehumandesignersintuition.becausethefirststepofthemethodisbasedonthedesignersproposition.Sotheresultistoalargeex.tentlimitedtothedesignersexperience.LamandJin200l、developedagatelocationoptimizationmethodbasedontheminimizationoftheStandardDeviationofFlowPathLengthSDLandStandardDeviationofFillingTimeSDTduringthemoldingfillingprocess.Subsequently,Shenet口,.004a2004boptimizedthegatelocationdesignbyminimizingtheweightedsumoffillingpressure,fillingtimedifferencebetweendifferentflowpaths,temperaturedifference,andoverpackpercentage.Zhaieta1.2005binvestigatedoptimalgatelocationwithevaluationcriteriaofiniectionpressureattheendoffilling.Theseresearcherspresentedtheobiec.tivefunctionsasperformancesofiniectionmoldingfillingoperation,whicharecorrelatedwithproductqualities.Butthecorrelationbetweentheperforii1.ancesandqualitiesisverycomplicatedandnoclearrelationshiphasbeenobservedbetweenthemyet.Itisalsodifficulttoselectappropriateweightingfactorsforeachterm.Anewobjectivefunctionispresentedheretoevaluatethewarpageofinjectionmoldedpartstooptimizegatelocation.Tomeasurepartqualitydirectly,thisinvestigationdefinesfeaturewarpagetoevaluatepartwarpage,whichisevaluatedfromtheflowpluswarpagesimulationoutputsofMoldflowPlasticsInsightMPIsoftware.Theobjectivefunctionisminimizedtoachieveminimumdeformationingatelocationoptimization.Simulatedannealingalgorithmisemployedtosearchfortheoptimalgatelocation.Anexampleisgiventoillustratetheeffectivityoftheproposedoptimizationprocedure.QUALITYMEASURESFEATUREWARPGEDefinitionoffeaturewarpageToapplyoptimizationtheorytothegatedesign,qualitymeasuresofthepartmustbespecifiedinthefirstinstance.Thetermqualitymaybereferredtomanyproductproperties,suchasmechanical,thermal,electrical,optical,ergonomicalorgeometricalproperties.Therearetwotypesofpartqualitymeasuresdirectandindirect.Amodelthatpredictstheproper.tiesfromnumericalsimulationresultswouldbecharacterizedasadirectqualitymeasure.Incontrast.anindirectmeasureofpartqualityiscorrelatedwithtargetquality,butitcannotprovideadirectestimateOfchatquality.Forwarpage,theindirectqualitymeasuresinrelatedworksareoneofperformancesofiniectionmoldingflowingbehaviororweightedsumofthose.Theperformancesarepresentedasfillingtimedifferentialalongdifferentflowpaths.temperaturedifferential,overpackpercentage,andsoon.Itisobviousthatwarpageisinfluencedbytheseperforii1.ances,buttherelationshipbetweenwarpageandtheseperformancesisnotclearandthedeterminationoftheseweightingfactorsisratherdifficult.Therefore.theoptimizationwiththeaboveObiectivefunction维普资讯http//www.cqvip.comLfefal/JZhejiangUnivSciA2007810771083probablywillnotminimizepartwarpageevenwithperfectoptimizationtechnique.Sometimes,improperweightingfactorswillresultinabsolutelywrongresults.Somestatisticalquantitiescalculatedfromthenodaldisplacementswerecharacterizedasdirectqualitymeasurestoachieveminimumdeformationinrelatedoptimizationstudies.Thestatisticalquantitiesareusuallyamaximumnodaldisplacement,anaverageoftop10percentilenodaldisplacements,andanoverallaveragenodaldisplacementLeeandKim,l995I996b.ThesenodaIdisplacementsareeasytoobtainfromthesimulationresults,thestatisticalvalues,tosomeextents,representingthedeformation.Butthestatisticaldisplacementcannoteffectivelydescribethedeformationofthein_iectionmoldedparts.Inindustry.designersandmanufacturersusuallypaymoreattentiontothedegreeofpartwarpageonsomespecificfeaturesthanthewholedeformationofthein.,_iectionmoldedpartsInthisstudyfeaturewarpageisdefinedtodescribethedeformationoftheinjectionparts.ThefeaturewarpageistheratioofthemaximumdisplacementofthefeaturesurfacetotheprojectedlengthofthefeaturesurfaceFig.1_h100%,Lwhereyisthefeaturewarpage,histhemaximumdisplacementonthefeaturesurfacedeviatingfromthereferenceplatform,andListheprojectedlengthofthefeaturesurfaceonareferencedirectionparallelingthereferenceplatform.SurfaceceplaneFig.1ThedefinitionoffeaturewarpageForcomplicatedfeaturesonlyplanefeaturediscussedhere,thefeaturewarpageisusuallyseparatedintotwoconstituentsonthereferenceplane,whicharerepresentedona2Dcoordinatesystemhl0l00o/o,1079where,yyaretheconstituentfeaturewarpagesintheXYdirectionandLx,LaretheprojectedlengthsofthefeaturesurfaceonYcomponent.EvaluationoffeaturewarpageAtierthedeterminationoftargetfeaturecombinedwithcorrespondingreferenceplaneandproiectiondirection,thevalueofLcanbecalculatedimmediatelyfromthepartwiththecalculatingmethodofanalyticgeometryFig.2.Lisaconstantforanypartonthespecifiedfeaturesurfaceandproiecteddirection.ButtheevaluationofhismorecomplicatedthanthatofL.yFeatureFig.2TheprojectedlengthevaluationSimulationofiniectionmoldingprocessisacommontechniquetoforecastthequalityofpartdesign,molddesignandprocesssettings.TheresultsofwarpagesimulationareexpressedasthenodaldeflectionsonZcomponent,,,andthenodaldisplacementWisthevectorlengthofvectorsumof,,andWzk,where,,karetheunitvectorsonZcomponent.Thehisthemaximumdisplacementofthenodesonthefeaturesurface,whichiscorrelatedwiththenormalorientationofthereferenceplane,andcanbederivedfromtheresultsofwarpagesimulation.Tocalculateh.thedeflectionoffthnodeisevaluatedfirstlyasfollowsCOSOcosflW,zcosy一%%,3whereisthedeflectioninthenormaldirectionofthereferenceplaneofithnodeW,WI1、,WizarethedeflectionsonX,Y,Zcomponentofithnode伐,B,aretheanglesofnormalvectorofthereferenceAandBaretheterminalnodesofthefeaturetoproiectingdirectionFig.2andarethedeflectionsofnodesAand维普资讯http//www.cqvip.com1080Lfefal/dZhefiangUnivSciA20078.10771083fCOSacosflcosy,lCOSacosflGzcosy,whereWA,WAy,arethedeflectionsonZcomponentofnodeWsx,andWezarethedeflectionsonX,Y,ZcomponentofnodeCOiAand∞lBaretheweightingfactorsoftheterminalnodedeflectionscalculatedasfollows2iA1一LiA/L,co1一JiA,whereLiAistheprojectordistancebetweenfthnodeandnodeA.Ultimately,histhemaximumoftheabsolutevalueofhmax{lI,I.,1}}Inindustry,theinspectionofthewarpageiscarriedoutwiththehelpofafeelergauge,whilethemeasuredpartshouldbeplacedonareferenceplatform.Thevalueofhisthemaximumnumericalreadingofthespacebetweenthemeasuredpartsurfaceandthereferenceplatform.GATEL0CAT10N0PTIMIZAT10NPR0BLEMFORMATIONThequalitytermwarpagemeansthepermanentdeformationofthepart,whichisnotcausedbyanappliedload.Itiscausedbydifferentialshrinkagethroughoutthepart,duetotheimbalanceofpolymerflow,packing,cooling,andcrystallization.Theplacementofagateinaniniectionmoldisoneofthemostimportantvariablesofthetotalmolddesign.Thequalityofthemoldedpartisgreatlyaffectedbythegatelocation.becauseitinfluencesthemannerthattheplasticf1owsintothemoldcavity.Therefore,differentgatelocationsintroduceinhomogeneityinorientation,density,pressure,andtemperaturedistribution,accordinglyintroducingdifferentvalueanddistributionofwarpage.Therefore.gatelocationisavaluabledesignvariabletominimizetheinjectionmoldedpartwarpage.Becausethecorrelationbetweengatelocationandwarpagedistributionistoalargeextentindependentofthemeltandmoldtemperatureitisassumedthatthemoldingconditionsarekeptconstantinthisinvestigation.Theinjectionmoldedpartwarpageisquantifiedbythefeaturewarpagewhichwasdiscussedintheprevioussection.Thesinglegatelocationoptimizationcanthusbeformulatedasfo11owsMinimizeminiX,SubjecttogXP/Po一10,X∈X,i1,2,,N,where,isthefeaturewarpagePistheinjectionpressureatthegatepositionP0istheallowableiniectionpressureofinjectionmoldingmachineortheallowableinjectionpressurespecifiedbythedesignerormanufacturerXisthecoordinatevectorofthecandidategatelocationsisthenodeonthefiniteelementmeshmodelofthepartforinjectionmoldingprocesssimulationNisthetotalnumberofnodes.Inthefiniteelementmeshmodelofthepart,everynodeisapossiblecandidateforagate.Therefore,thetotalnumberofthepossiblegatelocationⅣnisafunctionofthetotalnumberofnodesNandthetotalnumberofgatelocationstobeoptimizedNN一1Ⅳ一一1Inthisstudy,onlythesinglegatelocationproblemisinvestigated.SIMULATEDANNEALINGALG0RITHMThesimulatedannealingalgorithmisoneofthemostpowerfulandpopularmetaheuristicstosolveoptimizationproblemsbecauseoftheprovisionofgoodglobalsolutionstorealworldproblems.ThealgorithmisbaseduponthatofMetropoliseta1.1953,whichwasoriginallyproposedasameanstofindanequilibriumconfigurationofacollectionofatomsatagiventemperature.TheconnectionbetweenthisalgorithmandmathematicalminimizationwasfirstnotedbyPincusr1970.butitwasKirkpatricketa1.1983whoproposedthatitformedthebasisofanoptimizationtechniqueforcombinationalandotherproblems.Toapplythesimulatedannealingmethodtoop维普资讯http//www.cqvip.com

注意事项

本文(外文翻译单浇口优化注塑模英文版.pdf)为本站会员(淘宝运营)主动上传,人人文库网仅提供信息存储空间,仅对用户上传内容的表现方式做保护处理,对上载内容本身不做任何修改或编辑。 若此文所含内容侵犯了您的版权或隐私,请立即通知人人文库网([email protected]),我们立即给予删除!

温馨提示:如果因为网速或其他原因下载失败请重新下载,重复下载不扣分。

copyright@ 2015-2017 人人文库网网站版权所有
苏ICP备12009002号-5