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附录FseriesofminicarcrankshaftmachiningprocessCrankshaftisapistonengine,oneofthemainpartsandcomponents,usedtothereciprocatingpistonmovementintorotarymovement.Accordingtothenumberofenginecylinders,crankshaftgeneralsubcylinder,double,triplex,fourcylinderandsixcylindercrankshaft.Suchasthefourcylinderenginecrankshafthasfivemainjournalneckandfourlink,connectingrodjournal180°ineachangleintoaplane.Crankshaftcomplexprocess,especiallythemicrocarcrankshaft.MicrocarCrankshaftjournalsizeandhighgeometrictolerancerequirements,generallybasedonsixprecisionmanufacturing,journalroughnesstoachieveRa0.2μm.Someneckneededtobestrengthenedtodealwiththesurfacetoimproveitswearresistanceandfatiguestrength.FseriesofminicarcrankshaftMostofthematerialscurrentlyusedhighqualityalloystructuralsteel.However,duetoagoodcuttingperformanceofductileironcrankshaft,willbethepreferredstructuralshapes,andsteelcrankshaftandcanconductvariouskindsofheattreatmentandsurfacehardeningcrankhandletoraisetheantifatiguestrength,hardnessandwearresistance.Lowcostductileironcrankshaft,athomeandabroadhasbeenwidelyapplied.Fseriesofminicartotheductileironcrankshaftcrankshafttrend.ThemainauthorofsteelmicroengineFSeriestruckcrankshaftmachiningprocessanalysis1ProcessAnalysis1.1Crankshaftfeaturesandtechnicalmeasures1.1.1stiffnessdifferenceFSeriescrankshaftlargeraspectratiousuallyL/d710,thereforelessrigidity.Inordertopreventdeformationduringprocessingshouldtakethefollowingmeasuresselectionofahigherstiffnessofmachinetools,cuttingtoolsandfixtures,etc.,therebyreducingthedeformationandvibrationtoreducethetorsionaldeformation,bendingdeformationintheprocessasfaraspossibletheroleofcuttingforceoffsetreasonablearrangementsforworkplaceinordertoreducetheprocessingorderofthedeformationadditionalalignmentprocess.1.1.2theshapeofcomplexConnectingrodjournalandtheneckisnotwithaspindleaxis,intheprocessofconnectingrodjournalimbalanceeasilybeequippedtoquicklyfindjournalcenteriseccentricconnectingrodfixture,andshouldbebalancedblock.1.1.3TechnicalrequirementsMicrocarsofthetechnicalrequirementsofthecrankshaftisveryhigh,anditsmachiningprocesswiththeproductionofdifferentprogramsandthecomplexityofthecrankshaftandalotofdifference,butgenerallyincludethefollowingmainstagespositioningthebaseoftheprocessingrough,Finishthespindleneck,andothercylindricalconnectingrodjournalcoarsegrindingofthespindleneck,cylindricalconnectingrodjournallargeandsmallheadscrewandkeywayprocessingdrillholeprocessingsemigrindingspindleneck,refinedgrindingrodjournaljournalsurfacetreatmentBalancingSuperfinishingsuchasthejournal.1.2Positioningthebaselinechoice1.2.1thechoiceofbenchmarkcrudeInordertoensurethecenterspindleholedrilledintheroughoutersurfaceofneckpositionontheaxis,thespindleneckchosenfortheroughsurfaceofthecylindricalbase.Atthesametimeinordertoensurethattheprocessingoftheaxialsizeofthebaselevel,choosingthefirstⅢonbothsidesofthespindleneckaxialfanboardforthebenchmarkcrude.1.2.2assistedselectionbasedonroughFanontheboardinamillingprocessthatisprocessingplaneusedbytheconnectingrodjournalsupportingthebenchmarkcrude.1.2.3thechoiceofthebasefineProcessinganditsneckwiththespindleaxisoftheoutersurfaceofthejournal,thecentralholeinthebaseforthefine.Connectingrodjournalprocessingwhenprocessingthepinholeandaconnectingrodjournalcylindricalsurfaceasaprecisionbasedbenchmarks,makingiteasiertoensureTechnicalrequirements.Inaddition,thebenchmarkthirdaxialpositioningofthetwospindlenecksurfacelevelconsistentwiththeDesignBasis.1.3CrankshaftprocessAtpresentthemajorityofFseriesofminicarcrankshaft,materialsfor40Cr,roughpiecesofsteelforquenchingandtempering.Processoutlinedasfollows01.playcentralhole→02.carspacesfolder→03.finejournalowners→04.Millingpositioning→05.connectingrodjournalCart→06.thesizeofthefirstcoarsegrinding→07.carGordoniaping,andotherend→08.pingheadendcarsandother→09.coarsegrindingspindleneck→10.connectingrodjournalcoarsegrinding→11.hingepinholedrilling→12.keywaymilling→13.drillattackFlywheelscrew→14.drillholeinclined→15.halfgrindingspindleneck→16.connectingrodjournalgrinding→17.Balancingandtore→18.grindingspindleneck→19.test→20.nitride→21.repaircenterholes,chamfers→22.grindinghead→23.Finishbearinghole→24.MagneticParticleTesting→25.Deburring→26.oilorificepolishing→27.polishing.1.4ProcessAnalysisa.theimportanceofcenterholeInadditiontotheimpactofthecrankshaftcenterholeofthemassdistribution,itisalsoimportantbecauseitisanimportantprecisioncrankshaftprocessingbenchmark,theprocessingdirectlyaffecttheaccuracyofthecrankshaft,thecenterholequalityrequirementsmustbemet.However,afteraroughworkpiece,thecenterholeisinevitablethattheaccuracyisoftenaffected,sobeforefinishingmustbecarriedoutonthecentralholerepairresearch,toensurecompliancewithtechnicalrequirements.Oilstoneavailableorrubberwheelrepairresearch.Goodqualityrough,allowancedistributionofsmallanduniformallowance.Thencrankthequalityofthecenterboreholewiththegeometriccenterofbasiccoincidence,youdonotneedtospendforthepurchaseofhighqualityequipmentanddirectdrillcenteringcentralholegeometry.b.playcentralholeisusedtoidentifythegeometriccenterofthecrankshaftinplaceofcenterofmass,theappearanceisasaroughbenchmark.Roughandsmoothappearanceofthewholecircle,thenhitthecenterofpositionerroronthesmallhole.Poorqualityrough,allowanceallowancedistributionoflargeanduneven,itisnecessarytothequalityofthecenterborepreferred.Largerduetotheinitialimbalance,ifthegeometriccenterdrillholes,unevenweightdistribution,alargermomentofinertia,damagetheaccuracyofthefollowupprocessingequipment.Furthermore,indynamicbalance,theinitialimbalanceinthebalancecannotbetoomuchmoney.Inthiscase,preferenceshouldbegiventhequalityofdeterminedefforts.c.journalownerstheuseofprecisionCNClathe,highefficiencyandbettercontrolthelengthofsize.FSeriestrucksbecausethemicrofinishedcrankshaftlengthsizerequirements,sothisprocessforthefinishedproductsmeettherequirementsofthesizeofthelengthofplayAgoodfoundationforthenext.d.positioningsurfacemilling.Inordertolinkjournalcaratpointofdistribution,regardlessofwhichsidefortheoffsetposition,itwillseriouslychangethecrankshaftoftheuniformdistributionmarginprocesses,connectingrodjournalwillmakeaseriousshiftunderprocessingofwasteduetotheotherwillsothatdynamicbalanceoftheinitialincreaseortowastemoney.e.connectingrodjournaltocompleteprocessingtheuseofCNClathes,turningtoolscarwhenformingrodjournaliscorrect,thevolumeoffeedmedium,positioningclosetothesurfacehaveadirectimpactontechnologyproductrequirementscanbemet.Thisspindleneckandfinishingprocesses,asthelengthoffinishedproductsmustmeettherequirementsofsizeandlayagoodfoundationf.vehicleslargeandsmallthefirsthole,endprocessescannotbeignored.Decisionprocessbecausethetotallengthofthecrankshaftsize,locationandreprocessingbenchmarks.g.journalcoarsegrindingrodisanimportantprocess.Coarsegrindingcrankshaftconnectingrodjournaltothesecondsub180°toensurethatpiecesofthecrankshaftconnectingrodjournaleccentricityangleandsize.Clampbothendsofeccentricgrindermobilecrankshafteccentricitywillcausethechangesinsize,shouldbecarefullyadjustedtotherightofthelockedfixed.h.obliquedrillholeusingaspecialdrill.Thisprocesstoensurethatdrillingthemainholeofobliqueanglesandthelocationofitsimportsandexports.Theroleofobliqueholeinthejournalandthebearingtoprovidelubricationwhentherelativemotion,iftheoilorificeoffset,thenenterthebearinglubricatingoiltoreduceRoad,causingtheengineoftheoveralldeclineinfueleconomy,andtheymayevencauseearlywearandtear,seriousaccidentssuchasbushlocked.Therefore,intheprocessingofthefirstramptoensurethattheimportandexportofholelocations,followedbyobliqueholetoensurethatthedirectionofthejournalisnotoffset,soitshouldbeobliquejigholetocheckoften.Flywheeldrillingscrewattacki.theadoptionofanumberofmultistepprocess.Betweenthewireholepositionandthedegreebythedrillingjigsetsguaranteethelocationofpinholeisafewdegreesthepositioningoftheflywheelassemblyscrewbase,itmustensurethatthelocationofdegrees.Flywheeldrillingscrewattackproneprocessofqualityproblemsistheleakageholetappingandtappingdeepenough,thedeviceshouldbeusedeffectivelytocontrolthetappingdepthandtopreventleakage,suchastapping.Somecompaniesusingautomateddedicatedmachinesforprocessing,highefficiency,goodquality.j.neckgrindingspindleholeshouldbethetwotopchamferingDepartmentremovesand,sludge,toensurethattheprocessingbenchmarktheaccuracyofcentralholeand,ifnecessary,repairresearch.Grindingbeforethestartofthecircularwheelsurfaceanddetailedtorepairorjournalcannotguaranteethattheroughnessafterthegrindingandtheformationofspiralprintsandjournals,suchaslossofaround.Becausethecrankshaftislonger,tobeusedasanauxiliarycentersupportaircraftintothegrinding,thefirstjournaltowearasuitablesizelefttoshapelargerthan0.10.2mm,theCenterhasasuitableframethebaselevel.Inordertocrankthewholerootintheprocessingoperationatthetimeofincreasedrigidityandfastening,tobeusedinVclamptothespindleclampingneckcrankk.Astechnologyadvances,thecrankshaftmovingincreasinglystringentrequirementsoftheimbalance,thesmallerthedynamicimbalanceofmoney,crankshaftoperationworkmorestable,lessnoise,lesswear,longerlifeexpectancy.Grindingheadl.Generalarrangementtogetherwithaseparateprocess.Thisprocessisthefirstbeatofsmalllengthandsmallheadsizedifferenceultraeasy.Beforeprocessingwithdialindicatortocheckthespindleneckbeating,iftheultrapoor,shouldbeamendedtorecenterporechamferinghead,beatinguntilqualified.m.oilorificepolishingprocessisveryimportantbecauseifthereisoilorificeburr,itwillscratchthebearing,resultinginthephenomenonofearlynaphavepointedorifice,iftheoil,thencrankthefunctioningoftheformationofcrackswhenthestressconcentrationeffectsofTheirusefullife.n.thestatehaspromulgatedthecrankshafttechnicalconditionsclearlystipulatesthateachcrankshaftmustbeapprovedbythemagneticforceandtheimplementationofrigoroustestingstandards,itistheonlycrankshaftmachiningprocesscanbemoreintuitivetoexaminethequalityofthecrankshaftshallowsurfaceprocesses.AttentionafterthecrankshaftmustbeDemagnetizationdetection.o.crankshaftcrankshaftnitridingistoincreasetheeffectivemeansofwearresistant.Forhighvolumeproductionforthecrankshaft,inordertoimproveproductquality,totaketheatmosphereofnitrogenbasedgassoftnitriding.F系列微车曲轴机械加工工艺浅析
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