有关模具的英语论文（要带中文翻译的）

Precisioninjectionmoldingtechnologyofprogress

Abstract:Thepolymerprecisioninjectionmoldingtechnology,impactonprecisioninjectionmoldingoffactors,includingtheprecisionmolds,injectionmoldingmachinecontrolaccuracy,precisioninjectionprocesscontrolandothercomputercontroltechnology.Thesefactorswerediscussed,andgivetherelevantsolutions,finallyintroducessomeadvancedmoldingtechnology.

Keywords:precisioninjection;injectionmoldingmachineprecisioninjectiontechnology;PrecisionInjectionMold

Inrecentyears,aselectronics,telecommunications,medical,automotive,andotherindustriesoftherapiddevelopmentofthehigh-precisionplasticproducts,andhigh-performancerequirementsofgrowingprecisionmoldingtechnologytocontinuetoprogress,newtechnologiescontinuetoemerge.Precisioninjectionmoldingproductsnotonlyrequirehighdimensionalaccuracy,andlowwarpage,towritegood,butthereshouldalsobeexcellentopticalproperties.Injectionmoldingisthemostimportantoneoftheplasticmoldingmethods,includingplasticsplastics,injection,packing,cooling,andsomeofthebasicprocess,thusaffectingtheprecisioninjectionmoldingofmanyfactors.

1,precisionmolds

Toproducesophisticatedproducts,precisionmoldsisessential.DieDieingeneral,theaccuracyofthetemperaturecontrol,moldanddiedesignprecisionmanufacturing,useofplasticshrinkagerateimpacts.

1.1PrecisionMoldtemperaturecontrol

Ingeneralprecisioninjectionmoldingofparts,controlmoldtemperatureistoincreaseproductivity.Howevermoldtemperaturecontrolforprecisioninjectionmoldingofgreatimpact,itaffectspartsofthecontraction,shape,crystallization,suchasstress,hotandcoldcircuitdesignmoldtemperaturedistributionattherequestreasonable,precisecontrolaccuracy,adietemperatureofthebestandLengshuijicontrol.Moldtemperaturecontrolandcoolingtimeontheproductsandtheirimpactonperformanceofthefollowingfactors:

(1)meltplasticinjectionmoldsandatwo-cycletimewillbeproducedinthemoldtemperaturedifferencefluctuations,andshouldthereforebetominimizethevolatilitydifferentialpeak.

(2)theheattransferDieDieDieheatthroughtheconcreteanddieinthetransferoutofthemedia,moldischanged,themediacontrolisthekey,thegeneralimportandexportofitscoolingwatertemperaturedifferenceislessthan1℃Applicationoftheorytocalculatetheaveragetemperature,whichcanguaranteethestabilityofheattransfer.Mediaflowandheattransferareinterlinked,mouldsurfacetemperaturecanbeusedtocontrolthemediaflowsensortocompensateforenvironmentaltemperaturechangescausedbymoldtemperaturechanges.

(3)ToenablestableDieDiebytheheatabsorptionanddisseminationofbalance,theinjectionmoldingmachinetomeltinjectiontostrictlymaintainastabletemperature.Diesurroundingtemperatureonthemoldhadagreatimpactonthegeneralwillbeaffectedtodiewithinthemeltconvectioncoefficientofchange,sothebestsetupinthemoldsurfacetemperaturesensor,dieatanytimeobservationofthesurfacetemperature,andkeepitstable.

(4)changesintheefficiencyofheatexchangewithmoldafteralongtimeinthecoolingwaterpipesandYoubanappearsinthescale,thentheinterfacetoreducethethermalconductivityshouldfurringtimelyclearance.

1.2PrecisionDieDesignandManufacture

Diedesignisgoodorbadistoensurethedimensionalaccuracyofplasticpartspremise,inordertoenhancetheaccuracyofprecisioninjectionmold,intheprocessofdesigningacomputer-aidedanalysisisnecessary,especiallyforgatingsystemandtheflowofheat-conditioningsystemsmoldtemperaturedistributiontheanalysis.Applicationsshouldbeasmuchaspossibletheuseofsimulationsoftwareandclosetotheactualloadingconditionstomeltinthemoldsimulationanalysisinthepouring,cooling,andothernon-steady-stateprocess.

DiemanufacturingqualityassuranceplasticpartsSizeisthekeytoaccuracy,precisiondieisthemaincharacteristicofthemanufacturingandassemblyoperationsinadditiontopolishing,arenomanualprocessing.Diegeneralmachiningandmanualprocessingratioisabout6:4to7:3,andthemachiningprecisionmoldsandmanualprocessingratioof9:1.

Diematerialsandheattreatmentistheprotectionofprecisionmoldsinthemoldingprocess,thedietemperatureinthestate,whicheventhemouldpartstemperedbylowtemperature,hightemperaturemeltproductionandwillrepeatpartstempering而使lowerhardness,Considerationshouldalsobegivenretainedaustenitecausedbythevolumeexpansion.Thereforegeneraltemperingtemperatureshouldbeatleastmoldingprocessing,morethandoublethedietemperatureandlow-temperatureprocessingiscarriedoutproperlyinordertoeliminateresidualaustenite.

Onthehigh-precisionproductsforMoldingprecisionparts,assemblyaccumulatedprecisiondieinthedirectionoftheaccuracyofthesub-surfaceaswellastheparalleldegreeshouldachievemicronlevel.Moldshouldhavesufficientstrength,stiffnessandabrasionresistance,intheinjectionmoldingdeformationunderthepressureofhardwear.Toachievetheaboveprocessingcanbethree-dimensionalprecisionmachiningcenters,CNCmachinetoolandapplicationofCAD/CAM/CAEandothernewtechnologies.

1.3precisionmoldsdesignshrinkagerateofuse

Thermoplasticplasticmoldingshrinkagevolatile,tomolddesign,identifyandcontrolproductscavitysizedimensionalaccuracydifficult.Therefore,inplasticmolddesignshouldunderstandthecharacteristicsandcontractioncausedbytheshapeofthepartsofthedifferenceintherateofcontractionsite,andthenusethenecessarycompensationmeasures.Onthehigh-precisionplasticpartscanbemanufacturedinthedesignbeforesimplemold,measuredmoldingtothevariouspartsoftheactualshrinkagerate,thiscangreatlyenhancethedimensionalaccuracyofparts.

1.4,thedesignofprecisionmoldsgate

Gatetype,size,locationandquantityofallaffectedpartsdimensionalaccuracy.Atthegateofthejet,buttheeffectsofpoorfeeding,thick-walledpartsdonotapply.Gatepositionandtheflowofimpactmeltflowdistance,thelongertheprocessofthegreatercontraction.Multi-gateprocesscanbeshortened,butincreasingweldmarks.Gatepartsshouldbedesignedinaccordancewiththesizeandthechoiceofmaterialsandtheuseofsoftwaretohelpfinalizepracticalexperience.

2,thebestprecisioninjectionmoldingprocessparametersset

Choosethebestmoldingprocessparameterstoreduceplasticshrinkagerate.Plasticisthatthecontractionoftheheatshrinkableplastic,elasticrecovery,plasticdeformation,contractionaftercontractionandacomprehensivereflectionofaging,usuallycausedbyabsorbentmaterialormolecularchainrearrangementcaused,thespecificperformancelinearshrinkagerateandvolumecontractionratechangesinvalueofcommoncontractionsaid.Thermoplasticplasticinjectionmoldingproductsshrinkagevolatile,particularlyforcrystallineplasticsinjectionmoldingproductsevenmoreobvious,andnotonlydependonthedegreeofcrystallinityduetothechemicalstructure,butalsobytheprocessofcoolingparameters(coolingrate,themelttemperature,moldtemperature,productthickness)theimpactofthemoldcavitysizeanddesigndeterminethesizeprecisioncontrolproductsanddifficulties,thereisanurgentneedtobeawareofparametersontheinjectionmoldingofplasticshrinkagerateoftheimpactofthelaw.Partofthedifferenceinthicknessisgenerallybelievedthatthetwofactors:

First,high-pressuremeltthemoldcavitycausedminordeformationofadiewhentheelasticmodulusmaterialaftertheexpansion.Generallyspeaking,qualitycontrolandaccuracycanbeverygooddimensionalaccuracy,andatahighertemperature,moldlowmeltviscosity,viscositysmallergradient,inacertainscrewbackpressure,thequalityofprecisionpartscanbeaccuratelycontrolled.Butforliquidcrystalpolymer(LCP),itjustneedsalowermoldtemperature,itisbecausecoldLCPcasewillbepromptlyaftercoolingamorphous.

LCPhavelowmeltingheatandorderlystructureofthestate,intheliquidcrystallinestatetochangebetweencrystallinesolid,smallerchanges,whenfullycooling,theliquid-solidtransitionisalmostcompleteinaninstant.Dieinthecolder,whenacavity,thecavitymaterialandthebulkofgatehasbeencured,itisverydifficultstagecompressionaddedmelt,thuspartsandthesizeofthecavitysizeofthedeformationisveryclose.

Plasticamorphousthancrystallineplasticslowshrinkagewithamixtureofcontractionrateoflow-polymermaterials,elastomersatthesametimeastheincreaseofthecontent,materialsshrinkageratedecrease.Theenhancedorplasticfilling,heatcapacitydecreasestiffnessincreasedsignificantlyreduceshrinkageandfiberfillercontentorhigher,thesmallertherateofcontraction.Crystallineprecisionplasticproductsalsoaffectedbypressure.Aspressurecrystallizationoftheroleofinjectionpressure(P1),thepackingpressure(P2)andthefeedingpressure(P3)tospeedupthecrystallizationprocess,crystallizationoftheP1,P2,P3,theincreaseinupwardtrend.ForP1,thepressuretoimprovethecrystallizationofthedegreeofcrystallinity,thecontractionrateofincreaseroseP2andP3,ontheonehandbecauseofthedegreeofcrystallinityincreasedshrinkagerateincrease,ontheotherhandincreasedtoP2morepressuretomelt,thetypecavityhasbeenfullycompactedplastic;P3-feedincreasedtoincrease,andeffectivelypreventrefluxisconducivetoreducingshrinkage.Therefore,theplasticpartsoftheshrinkagerateistheresultofboth,withtheshrinkageofP1,P2,P3,thefirstincreasesandthendecreasesincreased.

Precisionplasticpartsrequiresnotonlyastablesizetolerances,butalsorequiresstrictmechanicalproperties.Thesecharacteristicsmainlydependonthecoolingphaseofthemeltintheheat-mechanicalroleofthehistoricalprocess.Moldtemperatureandcoolingtimeonthequalityofproductsandhaveadirectimpactonproductivity.Studyfoundthat,giventhedietemperature,thedimensionalaccuracyofproductswiththecoolingtimeisnottheextensionhasbeensignificantlyimproved,andonlyinacertainperiodoftime,afteraprominentrole.Ingeneralcoolingprocessinsuchacriticalpointintimetherearetwocooling,coolingtimeinthefirstpointalthoughproductionproductsalsohigheraccuracy,butitisnotthemoststablestate,andthesecondpoint-in-timecoolingcoolingrelativelylongtime,However,theproductsenablethemoststablestate.

3,usingprecisioninjectionmoldingmachinetoreplaceconventionalinjectionmoldingmachine

Precisioninjectionmoldingmachinegenerallylargerinjectionpower,inadditiontosuchinjectionpressureandinjectiontomeettherequirementsintermsofspeed,poweritselfwillbeontheinjectionproductsimprovetheaccuracyofacertainrole.Precisioninjectionmoldingmachinecontrolsystemsgenerallyhavehighcontrolprecision,itisrequestedbytheproductsthemselves.Highaccuracycanbeguaranteedcontrolofinjectionprocessparametershasgoodaccuracy,precisionproductsinordertoavoidfluctuationsdueprocessparameterschange.Thereforeprecisioninjectionmoldingmachinegenerallyoftheinjection,injectionpressure,injectionrateandpressure-pressure,back-pressureandscrewspeedprocessparameterssuchasamulti-levelfeedbackcontrol.PrecisionInjectionrequirementsofitsmodulussystemhassufficientrigidity,accuracyorproductswillbeamodelfortheelasticdeformationdecreased.Second-Die-Dieofthesystemmustbeabletoaccuratelycontrolthesize,ortoolargeortoosmallamodelofprecisionproductswillhaveanadverseimpact.Sointhedesign,itshouldbeconsideredDierigidity,stiffness,aswellasamodelsysteminordertoaccuratelycontrolthesizeoftheprecisionproducts,especiallyflat-panelthin-wallproducts.WhenDielarger,must-orientedcolumndeflectioncheck.Precisioninjectionmoldingmachinealsomustbeabletoworkinthehydrauliccircuitprecisetemperaturecontrol,worktopreventtheoilduetotemperaturechangescausedviscosityandflowchanges,furtherinjectionprocessparametersleadingtofluctuations而使productswouldlosetheiraccuracy.

3.1partsmoldingcycletimeconsistency

Generaltypicalinjectionmoldingmachinewiththreemodes:manual,semi-automaticandfullyautomatic.Astheinfluenceofvariousfactors,eachoftheprevioustwomodelsmoldingcycletimemaybedifferent,itwouldaffectthetemperatureandmaterialstodieintheLiaodongstay,therebyaffectingtheaccuracyofparts,inprecisionMoldingshouldtrytousetheautomaticmode.

3.2precisioninjectionmoldingmachinescrewtemperaturecontrolandthedesignofnew

InjectionMoldingMachinecylinderautomaticthermostatonthecycleofopeningandcustomsledtotheLiaodong,meltingmaterialdensityandviscositychanges,therebyaffectingthequalityanddimensionalaccuracyofpartsofthecyclicalfluctuationsintheinjectionmoldingmachinenozzleclosetoDieTherefore,thetemperatureofthenozzlemoldedpartsalsohaveasignificantimpacton.Moderninjectionmoldingmachineequippedwithaspecialprocesscontrolsoftwaretocontroltemperaturefluctuation,whichisproportionalintegraldifferential(PID)control.Atleastfromthebarreltemperaturedifferencegalvanicpointperspective,thePIDparameteroptimizationcancompletelyeliminatetemperaturefluctuations.

Tothequalityandstabilityoftheplasticparts,plasticsinjectionmoldingmachineunitisveryimportant.Totheplasticsunitisanimportantstandardtojudge:injectionvolume,plasticsrate,injectionrate,thepolymersintheplasticsunitatthetime.

Asthequalityofplasticpartsforthedimensionalaccuracyerrorofaveryimportantimpact,anditshouldbepreciseinjectioncontroloftheinjectionmoldingmachine.Improvemeasurementprecisioninjectionmoldingmachineofthemosteffectivewaysistousetechnologytoachievethesmallestscrewdiameter,especiallyforthelightpartsespecially.Themeasurementoftherelativescrewlengthandtheoveralllengthofscrewsmaller,intheplasticsmaterialsunitatthetimealsobecomeshorter.Screwthreadissimilartowideningthematerialscanbeavoidedstaylongersothatthescrewandstableoperation.Lodeepgroovewidththancorrespondinglysmaller,whichcreatealotofengineeringplasticspartsofthesmalldiameterscrewparticularlyeffective.Melthomogeneityandarenotsmallcompressionratiodecreases,itisbecausefromtheveryshallowgrooveLocausedverystrongresultoftheshearrate.Feedingthedifficultyofthedesign,itmustensurethatallaggregatescanbefedintoevenly.Consideringtheneedtoshortercycles,plasticsratemustalsobebigenough,inthedesignofthefeedmustbeeffectivelyresolvedthecontradictionbetween.Inaddition,ifadoptedbyatwo-stageinjectionscrewtoachieveprecisecontrolinjectionerror,whichrequiresthemeasurementofthemeltthroughsphericalvalvedetectedbyinjectiontoinjectionmoldingmachineintheDetroitinjectionmoldingmachine.

Beforemicroprocessorcontrolledbytheinjectionmoldingprocesscannotbeobtainedthroughinjectionprecisionvoltagecomparatorhasbeensuccessfullyresolved.VoltagecomparatorallowsTransmitterandothersensitivecamewiththeveryprecisevoltagesignalpassed,andwhenthesetpointappearstobefollowingthetruevalueofatimelysignalimmediatelytransmittedtothemicroprocessorcontroloftheorder,byorderofthecycleofoperationalproceduresAsynchronousfromtimetotimethroughadirecttransferofthesignalprocesstoeliminate,greatlyimprovingthecontrolaccuracy.

4,precisionmoldingtechnology

4.1inthemoldinjection-compressionmoldingapplications(ICM)technology

ICMtechnologyisthemeanstoopenacertaindistancedieundertheconditionsofthebeginninginjection,injectiontoacertainamount,themoldcavitybeginningoftheclosureofthemeltcompression,injectionmoldcompletelyclosedatthetermination,andthenpacking,coolinguntiltheremovalproducts.Throughinjection-compressionmoldingofcompressionproductstocompaction,makingproductsonthesurfaceofuniformpressuredistribution,thecompactionproductssuchsizehighaccuracyandstability,smalldeformation.Itisinthemouldopencircumstancesmeltintothecavityand,therefore,mobilechannel,forthelowpressureinjectionmolding,andreduceoreliminatethepressurecausedbytheresin-molecularorientationofthestressandproducts,whichimproveproducts,dimensionalstability.ICMtechnologyandflexiblecontrolcapabilitythantheinjectionmouldhasgreatlyimproved.Thereforeuseofthistechnologycanproducemoreprecisionparts,especiallythehigh-precisioncylindrical-shapedparts.

4.2high-speedinjectionmolding

High-speedinjectionmoldingmethodoffillingmeltsfasterratethanthetraditional10to100times,meltinthemoldcavitytoproducehighshearflow,decreaseviscosity,injectionspeed,slowdownplasticsurfacehardening,thusimprovingthinFormingproductswallthicknesslimit,inhibitexcessivemoldingpressure,aswellasbecauseofthelow-voltagemobilemode,theproductsreducestress.Thethin-wallprecisionproducts,wecanusetheinjectionscrewattheforwardfromthemeltenergyabsorptioninthescrewafterthecessationofmovementthroughtheexpansionofhigh-speedmeltfullcavitytoachieve.

4.3no-pressureinjectionmolding

No-pressureinjectionmoldingtechnologyreferstotheplasticmelthigh-speed,high-pressurefillingintothemold,andthencloseinthenozzleneedletomelttheplasticmoldcavityproductsautomaticallycompensatefordifferentpartsofthecontract,suchproductscanbegreatlyreducedwarpage.However,thismethodrequirespriorestimatepackingcontractionadded,hencetheneedfortheinjectionofahighercavitypressurevalue,andweneedclampingforcealsohigh.

4.4OtherIntelligentControlTechnology

Precisioninjectionmoldingprocessingconditionsintheprocessofcontinuousmonitoringandimplementationofprecisecontrolisveryimportant.Withthedevelopmentofcomputertechnology,computerizedinjectionmoldinghasbeenwidelyused.Amongthem,statisticalprocesscontrol(SPC),PIDtechnology,fuzzylogiccontrol(FCC),networkcontrolcenter(NNC)methodandtheprocessingmodelbasedonthereverseofthebackbonenetworksizecontrol.

5.Conclusion

Onthehigh-precisionplasticproducts,andhigh-performancerequirementsofthegrowingprecisioninjectionmoldingtechnologyistheimpetusformovingforward,peopleontheprincipleofprecisioninjectionmolding,theconstantdeepeningofunderstandingofprecisioninjectionmoldingtechnologyisthebasisforprogress.Withnewmaterials,newprocessesandnewequipmenthasemerged,particularlyintheplasticsprocessingcomputeristhewideapplicationoftheprecisioninjectiontechnologytocreategoodconditions.Aslongasareasonableuseofthesetechnologies,wewillbeabletoproducesophisticatedproducts.