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外文翻译--发动机零件泄漏检测技术及应用.doc

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外文翻译--发动机零件泄漏检测技术及应用.doc

英文原文EnginepartsleakdetectiontechnologyandapplicationFirst,anoverviewofthevoiceLeakdetectiontechniques,sometimesreferredtoasthetesttechnologyorsealingleakagedetectiontechnology.Inrecentyearshasbeenwidelyusedinautomobilemanufacturingindustry,suchasthecylinderblockwaterjacket,watersetofcylinderhead,crankshaftoilholes,etc.,inaddition,thereareclearancevolumemeasurementandengineassemblytesting,etc.Withtheapplicationanddevelopmentofleakdetectiontechnology,alsohasformedaprofessionalmanufacturers,moreprestigiousmanufacturerssuchasGermany,FrenchATEQJWFROEHLICHcompany,inc.,UnitedStatesoftheUSONcompany,COSMIntertechcorporation,inadditiontoJapan,TokyoMicroctrolvantypestrainscommune,Italy,etc.Leakingtestmachineismadeupofleakdetectioninstrument,mechanicalsealingclamp,updownmaterialmechanicalpartsandelectriccontrolsystemcompositionandsoon.SomemanufacturerssuchasGermany,aFloridacompany,notonlycanprovideallkindsofleakdetectionequipment,andcanprovidetryleakageorleakageautomaticline.Intheleakdetectiontechnology,thefirsttopointoutisleakingandnotleakisjustarelativeconcept,isnoleakageintheory,onlywhentheleakagequantitydoesnotexceedcertainlimits,wethinkthatisnotleak,orqualified.Second,fundamentalknowledgeofleakage1.1theflowofthefluidAleakiscontentbyalimitedspacetoruntotheexternalorothersubstancesbyspaceoutsideintotheinside.Contentscanbegas,liquidorsolid.Limitedspacecanmakeallkindsofexplanation,suchasenginecylinderbodywassealedchannelisalimitedspace.Leak,inshort,isakindoffluidflowphenomenon.Ingeneral,isfluidflowsthroughtheholesontheobjectorthe.Fluidflow,liketheflowoftheelectric,electronicmobilebecauseapotentialofhighandlow,aslongasthepotentialdifferencebetweentheconductors,therewillbeaflowofelectriccharge.Movementofmaterialmusthavemotivepower,theelectricpotentialdifferenceisthedrivingforce.Leakage,leakageamountdependsonthesizeoftheprimemover,availableundertypesaidQfdelta,whereQsaidleakage,deltasaidimpulsion,fisthefunction.Fisacomplexfunctionnormally,itisverydifficulttodeterminethesizeofthe,ifweseeitonlyasakindofextremelypureproportionalrelationship,andalsoonlytoapressuredifferencedelta,typeontheQCP1,P2,theproportionalityconstantCtype,P1,P2,saidthespacebothinsideandoutsidepressure,leakageoftheprimemoverislikecurrentelectromotiveforce,Cislikeconductance,socanbeCsaidasconduction.Aleakageisreferstothefluidthroughtheholesthroughthephenomenon,throughthequantityisrelatedtopressuredifferenceonbothsidesofthehole,alsowiththeeaseofflowthrough,namely,conduction.1.2fluidmotionAccordingtofluidmechanicstheory,theflowofthefluidaretwokindsofstate,thelaminarflowandturbulentflow.Whenlaminarviscousforceplaysaleadingrole,theparticleisgovernedbyviscousfluid,notvoluntarymovement,theinertialforceplaysaleadingrolewhenturbulentflow,fluidparticleinhighspeedmotionviscositynolongerbindit.Inthevacuumtechnology,canbedividedintolaminarviscousflowandmolecularflow.Accordingtothetheoryofgasmolecularmotion,forthroughthegascylinder,whenthegaswhenthemeanfreepathislargerthanthediameterofthecylinder,asmolecularflow.Ontheotherhand,themeanfreepathofgashours,thanthediameterofthecylinderisviscousflow.1.3thepipelineresistanceandconductionWiththeconductionofelectricityneedsaconductor,theconductoristhepipeline.Fortheleakitself,whetheritisasmallholeorcrack,canberegardedasakindofpipe.Inthetype,QCP1,P2,conductionCasthereciprocalofresistance.Therefore,canbecalculatedinthepipelinetransmissionpipelineresistance.Fluidflowisfarmorecomplicatedthantheelectricconduction,whencalculatingtheCvalue,shouldbeaccordingtothesize,shape,pressurepipe,fluidcharacteristics,suchasspecificconditionstocalculate.Ifacontainerunderacertainpressureleak,butitdoesnotleak.Couldget,fromwehavetalkedabouttheformulasofgasandliquidinthesamepipelinetransmissionisnotthesame.2.1leakageofformContainerleakphenomenon,suchaswaterleakageoftheenginecylinder,usuallyismainlyduetothelocaltissuelooseontheblankcastingquality,castingormachiningerrorcausetheholewallistoothinandprocesscausedbyunequalsealantpluggingplacedaubreason.Infact,forleakagetechnology,thereisnoneedforaccurateunderstandingoftheleakageofvariousforms,butitisalsoimpossible.Leakdetectionbelongstoakindofnondestructivetesting,metallographicanalysisofitisdifferentfromthematerial.Therefore,wecandoisdetermineleakage.Inordertobetterunderstandtheleakagephenomenon,itisnecessarytoknowsomesimilardiffusionandthroughthephenomenontoleakphenomenon.Thesephenomenainthegasflowthroughsolidthispoint,andtheleakageoftheresultisthesame.Diffusionphenomenonreferstobothsidesofthegasinavehiclewithadifferentialpressure,orpressuredifference.Gasfromhighpressureorhighpressuretolowinthedirectionoftheflowdirection.Thisphenomenonissimilartoleak.Whenthevehicleissolid,gasfrommediumflowsthroughtheholes,orspreadtothevehiclevehiclenoleakholeflowafterthepast.Inbothcasesisbelongtowhichkindof,sometimesitisdifficulttojudge.Throughreferstogasfromasolidpasseddissolvedthematerialfirst,increasingconcentration,finallyintheweehours.2.2theleakageTherearethreekindsofleakageofrepresentation1insize,suchasroundandstraightshape,innerdiameterandlengthishowmuchforeachpleaseindicateassaid.Actuallythissizemeasurementisverydifficulttodoit,evencantdo.So,thismethodisnotpractical.2usingleak,saidtothedifficultyofthetransmissionbox.Thiswayisnotsaidleakageshapeitself,butsaidthesizeofthegaspathway.3expressedingasflow.Thismethodhasbeenwidelyused,becauseitiseasytouseinstrumenttomeasuretheflowofgas,orgasflowmeasurementwithacollectionofbubblesmethod.3.1theclassificationoftestmethodToonedevicetoknowtheleaks,andwillknowhowmuchitsleakage,mustexertaprimemover,i.e.letthedeviceproducesapressuredifferencebetweeninsideandoutside,socanthedevicecompressionordecompressiontwoways.Inaddition,canalsobeclassifiedaccordingtotheleakdetectionprocess,onekindisplaced,anotherfordynamicmethod.Alsohaveaccordingtothedeterminationofobjectclassification,canbedividedintotheamountofgasorliquidquantitymeasurementandpressuremeasurementdirectlyorpartialpressuremeasurement.Intheabovedetectionmethod,pressuremethodisusedforthedetectionofcommonlyusedmethods.Pressuremethodisusedforthedetectionofcommonlyusedmethods.Placepressuremethodandpressuremethodandpressuredynamicmethod.Decompressionmethodiscommonlyreferredtoasvacuummethod,thismethodisnocompressionmethodusedwidely,butithashighdetectionaccuracy,andeasyintheworkpiecetobemeasuredhavetoseal.Vacuumprocess,likepressure,vacuumandvacuumdynamicplacement.Suchasvacuumdifferentialpressuremethod,liquidcoatingmethod,etc.Andmethodsusedinthevacuumconditionsthanthekindsofpressureundertheconditionofthekindsofdetectionmethods.3.2selectionofleaktestInnumerousdetectionmethods,eachmethodhasitsdifferentfeatures.Choicesshouldconsiderwhoissuitablefor,thosewhodontfit.AccordingtothedifferentfeaturesofvariousdetectionmethodstochoosefromthefollowingaspectsintoconsiderationPrinciple1irrespectiveoftheapproach,dontfullyunderstandtheprincipleofthemethod,willnotgetgoodresult.2thesensitivitytheminimumleakagecanbemeasuredshouldconsiderwhichmethodisusedtomeasureoftheleveltowhichtheleakage.3detectiontimeirrespectiveofthedetectionmethod,ittakesacertaintime.Forplacementtesting,fromRichardwillextendtheplacedtimewillimprovethesensitivityandthedetectionofanartifactoftheleakagetakesalongtime,obviouslycannotbeusedforonlinedetectionofengineparts.4testenvironmentofvarioustestmethodsisdifferenttotherequirementoftestenvironment.Ifadoptthemethodofmeasuringpressurevalue,itisfollowtheidealgasequationofstate,sothetemperature,humidityandotherfactorsonthemeasuringresultsislarger,theinfluenceofthechoiceismustbetakenintoaccount.5leakagepositionjudgmentinallkindsofdetectionmethods,somecanonlygivetotheleakage,leakagecandeterminewhetherartifacts,butitcantleak,somecanreflecttheworkpieceisleaking,anddetermineleak,butthespecificleakageitisdifficulttoget,andcangiveleakage,candeterminethespecificleakagain.Ifwanttorepairtheleakageoftheworkpiece,theleakofthejudgmentisnecessary.6reliabilityleakdetectionbelongstoameasuringtechnique,themeasurementmustbecredibleandreliable.Allkindsofmethodisusuallyaccompaniedbyhumaneyedetection,duetothefactorsthat,itsconsistencyispoor,butisstableandreliable.Andvariousinstrumentmethod,althoughbetterconsistency,butitsstabilityandreliabilityoftheinstrument,andmanyotherfactorsinfluence.Alllandownerseconomydetectionefficiencywhenchoosingmethodofmeasurementisalsoafactortoconsider.Theaboveitemsisourstartingpointofhowtochoosewhatkindoftestmethod.Inspecificchoices,theyshouldbeandotherfactors,suchastests,theinfluenceofworkpiecetosealtheeaseofcombinationofconsideration,andchoosethebestmethodforleakdetection.4severalmajorleakdetectorandthedetectionmethodIntheleakdetectiontechnology,atpresentthemainleakagedetectorandthedetectionmethodhasaabsolutepressuretypeleakagedetectorbdifferentialpressuretypeleakagedetectorcmassflowleakdetector4.1theabsolutepressuretypeleakdetectorandthedetectionmethodCommonlyusedisthestepdownmethod,alsocanuseboosterandthevacuumismeasured.Thetestprocedurecanberoughlydividedintopreinflatable,inflatable,voltageregulator,measurementexhaustfivestages1openthevalve,airinflatedtothepressureP,fillingstageandcanbebrokendownintopreaerationandaerationsteportwo.Stablestage1valveclosed,thisphaseistoprovidethestablegasandheatexchangeoftime,itisnecessaryforprecisemeasurement,thestablephaseovertheinstantaneouspressurevalueasareferencepressurestorage.Phasesmeasurementsystemformeasuring.Tomonitorthefinalpressure,andcomparingwithreferencevalue,measuretheΔPvalues,ΔPvaluesinexcessoftheprescribedthresholdforunqualified,leakratecanbeobtainedbyΔPvalueVExhaustphasetheartifactsinthegasfromtheatmosphere,usuallyadoptslooseblockingartifactstoexhaust.4.2thedifferentialpressuretypeleakdetectorandthedetectionmethodIntheabsolutepressuretypetestinginstrument,sensitiveelementUSESthepressuresensor,differentialpressuretypeleakagedetectorisusedinthedifferentialpressuresensor.Differentialpressuretypeofleakdetectormeasurementprocessbasicallyisdividedintofivestages.Thedifferenceisinflatablestage1,2valveareopened.Bygasphaseintothestablebalance,1offvalve,thevalveopen2,sothebalanceattheendofthestage,backpressurechamberHandLpressureequaltothepressureroom,ΔP0.Whenenteredthemeasurementphase,valveshutoff.IfleaksartifactshaveLcavitypressureisreduced,producingpressuredifferentialΔP,inthesameway,andcanbedeterminedfromΔPVleakrate.AbsolutepressureanddifferentialpressuretypeleakdetectordetectorismeasuredbyusingthepressurevaluetoindirectlymeasurethechangeoftheleakrateofV.4.3themassflowtypeleakdetectorandthedetectionmethodMassflowtypeleakdetectorisdirectlymeasuredworkpieceleakflowinstrument,thesensitiveelementistheflowsensorusuallyusingthemodulecomponent.Inflowsensorwithaconstanttemperatureheatingsystem,whentheairflowflowchange,takeawaytheheatchangemaketemperaturet,sothatthetemperatureoftheclosedloopsystemheatingcurrentorvoltagechanges,whichcanmeasuretheflowchanges,duetothezeromethodisusedtomeasure,soitcanobtainhigherprecision.Thiskindofflowsensorcandetectverysmallflownotonly,alsocanmeasurethelargerflowleakagerate,butalsocanmeasurethedirectionofairflow.Duetoflowwasmeasuredunderconstanttemperature,sothemeasuredmassflowrateis,therelativelysmalleffectonthetemperature,canbeusedforleakdetectionoflargeflow,largevolume.Inordertoimprovetheaccuracyofmeasurement,themassflowtypetesting,alsooftenusestandardartifactsandgascircuitcomposedofworkpiecetobemeasured.Whentheworkpiecetobetestedforleaks,thepressureisreduced,whilethestandardartifactsthepressureinsidethecontainerremainsconstant.Sensorspickupbetweenthetwoartifacts,compressedairpressureisPfromthestandardworkpiecetobemeasuredbysensorartifacts.Despitetheabovethreekindsofmeasurementmethodscanmeettherequirementsofthevastmajorityofleakdetection,butfrompracticesituationandpricelevel,firstrecommendedtheuseofleakdetectorisabsolutepressuretype,becauseitissimple,reliable,doesnotneedtobalancethereferenceartifacts.Undertheconditionofthehighaccuracyrequirement,itisrecommendedtousedifferentialpressuretypeleakdetector.Underthebigleakageflow,isrecommendedtousemassflowtypeleakdetector,suchasleakdetectionofinletandexhaustvalveseat.5engineparts,leakagetryleakageprocessanalysisandcommonlyusedmethod

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