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外文翻译--F系列微车曲轴机械加工工艺浅析.doc

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外文翻译--F系列微车曲轴机械加工工艺浅析.doc

附录FSERIESOFMINICARCRANKSHAFTMACHININGPROCESSCRANKSHAFTISAPISTONENGINE,ONEOFTHEMAINPARTSANDCOMPONENTS,USEDTOTHERECIPROCATINGPISTONMOVEMENTINTOROTARYMOVEMENTACCORDINGTOTHENUMBEROFENGINECYLINDERS,CRANKSHAFTGENERALSUBCYLINDER,DOUBLE,TRIPLEX,FOURCYLINDERANDSIXCYLINDERCRANKSHAFTSUCHASTHEFOURCYLINDERENGINECRANKSHAFTHASFIVEMAINJOURNALNECKANDFOURLINK,CONNECTINGRODJOURNAL180INEACHANGLEINTOAPLANECRANKSHAFTCOMPLEXPROCESS,ESPECIALLYTHEMICROCARCRANKSHAFTMICROCARCRANKSHAFTJOURNALSIZEANDHIGHGEOMETRICTOLERANCEREQUIREMENTS,GENERALLYBASEDONSIXPRECISIONMANUFACTURING,JOURNALROUGHNESSTOACHIEVERA02ΜMSOMENECKNEEDEDTOBESTRENGTHENEDTODEALWITHTHESURFACETOIMPROVEITSWEARRESISTANCEANDFATIGUESTRENGTHFSERIESOFMINICARCRANKSHAFTMOSTOFTHEMATERIALSCURRENTLYUSEDHIGHQUALITYALLOYSTRUCTURALSTEELHOWEVER,DUETOAGOODCUTTINGPERFORMANCEOFDUCTILEIRONCRANKSHAFT,WILLBETHEPREFERREDSTRUCTURALSHAPES,ANDSTEELCRANKSHAFTANDCANCONDUCTVARIOUSKINDSOFHEATTREATMENTANDSURFACEHARDENINGCRANKHANDLETORAISETHEANTIFATIGUESTRENGTH,HARDNESSANDWEARRESISTANCELOWCOSTDUCTILEIRONCRANKSHAFT,ATHOMEANDABROADHASBEENWIDELYAPPLIEDFSERIESOFMINICARTOTHEDUCTILEIRONCRANKSHAFTCRANKSHAFTTRENDTHEMAINAUTHOROFSTEELMICROENGINEFSERIESTRUCKCRANKSHAFTMACHININGPROCESSANALYSIS1PROCESSANALYSIS11CRANKSHAFTFEATURESANDTECHNICALMEASURES111STIFFNESSDIFFERENCEFSERIESCRANKSHAFTLARGERASPECTRATIOUSUALLYL/D710,THEREFORELESSRIGIDITYINORDERTOPREVENTDEFORMATIONDURINGPROCESSINGSHOULDTAKETHEFOLLOWINGMEASURESSELECTIONOFAHIGHERSTIFFNESSOFMACHINETOOLS,CUTTINGTOOLSANDFIXTURES,ETC,THEREBYREDUCINGTHEDEFORMATIONANDVIBRATION;TOREDUCETHETORSIONALDEFORMATION,BENDINGDEFORMATION;INTHEPROCESSASFARASPOSSIBLETHEROLEOFCUTTINGFORCEOFFSET;REASONABLEARRANGEMENTSFORWORKPLACEINORDERTOREDUCETHEPROCESSINGORDEROFTHEDEFORMATION;ADDITIONALALIGNMENTPROCESS112THESHAPEOFCOMPLEXCONNECTINGRODJOURNALANDTHENECKISNOTWITHASPINDLEAXIS,INTHEPROCESSOFCONNECTINGRODJOURNALIMBALANCEEASILYBEEQUIPPEDTOQUICKLYFINDJOURNALCENTERISECCENTRICCONNECTINGRODFIXTURE,ANDSHOULDBEBALANCEDBLOCK113TECHNICALREQUIREMENTSMICROCARSOFTHETECHNICALREQUIREMENTSOFTHECRANKSHAFTISVERYHIGH,ANDITSMACHININGPROCESSWITHTHEPRODUCTIONOFDIFFERENTPROGRAMSANDTHECOMPLEXITYOFTHECRANKSHAFTANDALOTOFDIFFERENCE,BUTGENERALLYINCLUDETHEFOLLOWINGMAINSTAGESPOSITIONINGTHEBASEOFTHEPROCESSING;ROUGH,FINISHTHESPINDLENECK,ANDOTHERCYLINDRICALCONNECTINGRODJOURNAL;COARSEGRINDINGOFTHESPINDLENECK,CYLINDRICALCONNECTINGRODJOURNAL;LARGEANDSMALLHEADSCREWANDKEYWAYPROCESSING;DRILLHOLEPROCESSING;SEMIGRINDINGSPINDLENECK,REFINEDGRINDINGRODJOURNAL;JOURNALSURFACETREATMENT;BALANCING;SUPERFINISHINGSUCHASTHEJOURNAL12POSITIONINGTHEBASELINECHOICE121THECHOICEOFBENCHMARKCRUDEINORDERTOENSURETHECENTERSPINDLEHOLEDRILLEDINTHEROUGHOUTERSURFACEOFNECKPOSITIONONTHEAXIS,THESPINDLENECKCHOSENFORTHEROUGHSURFACEOFTHECYLINDRICALBASEATTHESAMETIMEINORDERTOENSURETHATTHEPROCESSINGOFTHEAXIALSIZEOFTHEBASELEVEL,CHOOSINGTHEFIRSTⅢONBOTHSIDESOFTHESPINDLENECKAXIALFANBOARDFORTHEBENCHMARKCRUDE122ASSISTEDSELECTIONBASEDONROUGHFANONTHEBOARDINAMILLINGPROCESSTHATISPROCESSINGPLANEUSEDBYTHECONNECTINGRODJOURNALSUPPORTINGTHEBENCHMARKCRUDE123THECHOICEOFTHEBASEFINEPROCESSINGANDITSNECKWITHTHESPINDLEAXISOFTHEOUTERSURFACEOFTHEJOURNAL,THECENTRALHOLEINTHEBASEFORTHEFINECONNECTINGRODJOURNALPROCESSINGWHENPROCESSINGTHEPINHOLEANDACONNECTINGRODJOURNALCYLINDRICALSURFACEASAPRECISIONBASEDBENCHMARKS,MAKINGITEASIERTOENSURETECHNICALREQUIREMENTSINADDITION,THEBENCHMARKTHIRDAXIALPOSITIONINGOFTHETWOSPINDLENECKSURFACELEVELCONSISTENTWITHTHEDESIGNBASIS13CRANKSHAFTPROCESSATPRESENTTHEMAJORITYOFFSERIESOFMINICARCRANKSHAFT,MATERIALSFOR40CR,ROUGHPIECESOFSTEELFORQUENCHINGANDTEMPERINGPROCESSOUTLINEDASFOLLOWS01PLAYCENTRALHOLE→02CARSPACESFOLDER→03FINEJOURNALOWNERS→04MILLINGPOSITIONING→05CONNECTINGRODJOURNALCART→06THESIZEOFTHEFIRSTCOARSEGRINDING→07CARGORDONIAPING,ANDOTHEREND→08PINGHEADENDCARSANDOTHER→09COARSEGRINDINGSPINDLENECK→10CONNECTINGRODJOURNALCOARSEGRINDING→11HINGEPINHOLEDRILLING→12KEYWAYMILLING→13DRILLATTACKFLYWHEELSCREW→14DRILLHOLEINCLINED→15HALFGRINDINGSPINDLENECK→16CONNECTINGRODJOURNALGRINDING→17BALANCINGANDTORE→18GRINDINGSPINDLENECK→19TEST→20NITRIDE→21REPAIRCENTERHOLES,CHAMFERS→22GRINDINGHEAD→23FINISHBEARINGHOLE→24MAGNETICPARTICLETESTING→25DEBURRING→26OILORIFICEPOLISHING→27POLISHING14PROCESSANALYSISATHEIMPORTANCEOFCENTERHOLEINADDITIONTOTHEIMPACTOFTHECRANKSHAFTCENTERHOLEOFTHEMASSDISTRIBUTION,ITISALSOIMPORTANTBECAUSEITISANIMPORTANTPRECISIONCRANKSHAFTPROCESSINGBENCHMARK,THEPROCESSINGDIRECTLYAFFECTTHEACCURACYOFTHECRANKSHAFT,THECENTERHOLEQUALITYREQUIREMENTSMUSTBEMETHOWEVER,AFTERAROUGHWORKPIECE,THECENTERHOLEISINEVITABLETHATTHEACCURACYISOFTENAFFECTED,SOBEFOREFINISHINGMUSTBECARRIEDOUTONTHECENTRALHOLEREPAIRRESEARCH,TOENSURECOMPLIANCEWITHTECHNICALREQUIREMENTSOILSTONEAVAILABLEORRUBBERWHEELREPAIRRESEARCHGOODQUALITYROUGH,ALLOWANCEDISTRIBUTIONOFSMALLANDUNIFORMALLOWANCETHENCRANKTHEQUALITYOFTHECENTERBOREHOLEWITHTHEGEOMETRICCENTEROFBASICCOINCIDENCE,YOUDONOTNEEDTOSPENDFORTHEPURCHASEOFHIGHQUALITYEQUIPMENTANDDIRECTDRILLCENTERINGCENTRALHOLEGEOMETRYBPLAYCENTRALHOLEISUSEDTOIDENTIFYTHEGEOMETRICCENTEROFTHECRANKSHAFTI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