冷激铸铁挺杆的磨损特性之研究

冷激铸铁挺杆的磨损特性之研究Abstract:

Inordertoresearchthewearcharacteristicsofcoldextrudedcastironrockerarm,thispaperadoptsthemethodofweartesttostudythewearmorphology,wearmechanismandwearresistanceofcoldextrudedcastironrockerarmunderdifferentoperatingconditions.Theresultsshowthatthewearsurfaceofcoldextrusioncastironrockerarmmainlypresentsthreetypesofwearmechanisms:abrasivewear,adhesivewearandfatiguewear.Andunderdifferentoperatingconditions,thewearmorphologyandwearmechanismpresentedbycoldextrudedcastironrockerarmhavecertaindifferences.Therefore,itisnecessarytofullyunderstandthewearcharacteristicsofcoldextrudedcastironrockerarmandanalyzethemechanismofwear.

Keywords:coldextrudedcastironrockerarm,wearmorphology,wearmechanism,wearresistance

Introduction:

Coldextrudedcastironrockerarmisanimportantcomponentinautomotiveenginevalvetrainsystem.Therockerarmisresponsibleforconvertingtherotarymotionofthecamshaftintothelinearmotionofthevalvestem,soastoopenandclosethevalveatacertaintime.Duringtheoperationoftherockerarm,itwillsufferfromthewearofthecamandthevalve,andthewearwillleadtothefailureofthevalvetrainsystem,whichwillgreatlyaffecttheperformanceandservicelifeoftheengine.Therefore,itisnecessarytoresearchthewearcharacteristicsandwearmechanismofcoldextrudedcastironrockerarm,inordertoimproveitswearresistanceandprolongitsservicelife.

Experimentalprocedure:

Inthisstudy,theweartestofcoldextrudedcastironrockerarmwascarriedoutonaweartester.Thetestparameterssuchasload,speed,lubricantandwearingmediumwerecontrolledandadjusted.Thewearmorphology,wearmechanismandwearresistanceofcoldextrudedcastironrockerarmunderdifferentworkingconditionswereobservedandanalyzed.

Resultsanddiscussion:

Afteranalysisofthetestresults,itwasfoundthatthewearsurfaceofcoldextrusioncastironrockerarmmainlypresentsthreetypesofwearmechanisms:abrasivewear,adhesivewearandfatiguewear.Abrasivewearisthemainwearmechanism,whichiscausedbythesolid,liquidorgasabrasiveparticlesinthelubricatingoil,andtheabrasiveparticlescanproducescratchesorgroovesonthesurfaceoftherockerarm.Adhesiveweariscausedbythecontactbetweentheroughsurfacesoftherockerarmandthevalveorcam,andthehighfrictionalforcewillcausethematerialstosticktoeachotherandproducepittingordeformation.Fatigueweariscausedbytherepeatedstressonthesurfaceoftherockerarm,anditwillcausethesurfaceoftherockerarmtofatigueandproducecracksorspalling.

Theanalysisresultsalsoshowthatunderdifferentoperatingconditions,thewearmorphologyandwearmechanismpresentedbycoldextrudedcastironrockerarmhavecertaindifferences.Forexample,whentheloadandspeedareincreased,thewearoftherockerarmwillbecomemoreserious,andtheabrasivewearwillbecomethemainwearmechanism.Whenthelubricatingoiliscontaminatedbyimpurities,theadhesivewearwillbemoreserious.Whenthelubricatingoilisinsufficientordriedup,thefatiguewearwillbemoreserious.

Conclusion:

Insummary,thewearcharacteristicsandwearmechanismofcoldextrudedcastironrockerarmhavebeenstudiedinthispaper.Theresultsshowthatabrasivewear,adhesivewearandfatigueweararethemainwearmechanismsoftherockerarm,andthewearmorphologyandwearmechanismpresentedbytherockerarmunderdifferentoperatingconditionshavecertaindifferences.Therefore,inordertoimprovethewearresistanceandprolongtheservicelifeofcoldextrudedcastironrockerarm,itisnecessarytofullyunderstanditswearcharacteristicsandanalyzethemechanismofwear,andtakecorrespondingmeasurestoreduceitswearandprolongitsservicelife.Inadditiontothewearcharacteristicsandwearmechanismsofcoldextrudedcastironrockerarm,therearealsootherfactorsthataffectitswearresistanceandservicelife.Firstly,thematerialcompositionandmanufacturingprocessoftherockerarmwillaffectitswearresistance.Thecontentanddistributionofcarbonandotheralloyelementsintherockerarmmaterialwillaffectitshardness,strengthandwearresistance.Themanufacturingprocessoftherockerarm,suchascastingorcoldextrusion,willalsoaffectitsmicrostructureandmechanicalproperties,andthusaffectitswearresistance.

Secondly,thelubricationconditionandwearingmediumwillalsoaffectthewearresistanceoftherockerarm.Adequateandproperlubricationcanreducethefrictionandwearbetweentherockerarmandthevalve/cam,whileinadequateorcontaminatedlubricationwillacceleratethewearoftherockerarm.Thepropertiesofthewearingmedium,suchasparticlesize,hardness,andshape,willalsoaffectthewearmechanismandmorphologyoftherockerarm.

Furthermore,theoperatingconditionsoftheenginealsoplayacrucialroleinthewearoftherockerarm.Theload,speed,temperatureandvibrationoftheenginewillaffectthedynamiccharacteristicsandwearoftherockerarm.Highloadsandspeedswillincreasethewearoftherockerarm,whilehightemperatureandvibrationmayacceleratethefatiguewearoftherockerarm.

Toimprovethewearresistanceandservicelifeofcoldextrudedcastironrockerarm,itisnecessarytoconsiderallthesefactorsandtakecorrespondingmeasures.Thismayincludeoptimizingthematerialcompositionandmanufacturingprocessoftherockerarm,usinghigh-qualitylubricantsandmaintaininggoodlubricationconditions,improvingthequalityofthewearingmedium,anddesigningappropriateoperatingconditionsfortheengine.Bydoingso,thewearresistanceandservicelifeofcoldextrudedcastironrockerarmcanbesignificantlyimproved.Inadditiontothefactorsmentionedabove,thedesignoftherockerarmalsoplaysacriticalroleinitswearresistanceandservicelife.Theshape,sizeandcontactareaoftherockerarmwilldirectlyaffectitswearmechanismandmorphology.

Forinstance,reducingthecontactareabetweentherockerarmandthevalve/camcanminimizethewearbetweenthetwo,andchangingtheshapeorcoatingthesurfaceoftherockerarmcanalsoimproveitswearresistance.Moreover,reducingtheweightoftherockerarmcanhelptoreducetheoverallloadandwearontheengine,whichcaninturnimprovethewearresistanceoftherockerarm.

Tofurtherenhancethewearresistanceofcoldextrudedcastironrockerarm,researchersandmanufacturersarealsoexploringnewtechnologiesandmaterials.Forinstance,theapplicationofnanostructuredcoatingsornanocompositematerialscansignificantlyimprovethewearresistanceoftherockerarm,andtheuseofadvancedmanufacturingprocesses,suchaslasercladdingor3Dprinting,canhelptocreatemorecustomizedanddurablerockerarms.

Inconclusion,wearresistanceandservicelifearecrucialfactorstoconsiderwhendesigningandmanufacturingcoldextrudedcastironrockerarm.Byoptimizingthematerialcomposition,manufacturingprocess,lubricationcondition,andoperatingconditionsoftherockerarm,aswellasexploringnewtechnologiesandmaterials,thewearresistanceandservicelifeoftherockerarmcanbegreatlyimproved,leadingtobetterengineperformanceandlongerenginelife.Alongwithimprovingthewearresistanceoftherockerarm,thereareotherstrategiesthatcanbeemployedtoprolongitsservicelife.Lubricationplaysacriticalroleinreducingthefrictionandwearbetweentherockerarmandotherenginecomponents.Usinghigh-qualitylubricantswithappropriateviscosityandadditivescanaidinreducingwearandtearontherockerarm.Aproperoilchangeintervalisalsovitalforlong-termenginehealth.

Furthermore,regularmaintenanceandproperinstallationoftherockerarmcanalsocontributetoitslongevity.Ensuringthattherockerarmisinstalledcorrectlywiththeappropriatetorquespecificationsisparamountinprolongingitsservicelife.Additionally,regularinspectionforsignsofwearanddamagecanhelpidentifyissuesbeforetheycausesignificantdamagetotheengine.

Inadditiontotheabovemethods,thereareotherdesignimprovementsthatcanbemade.Oneapproachwouldbetoreplacethecoldextrudedcastironrockerarmwithalighterandmorerobustmaterialthatalsohasexcellentwearresistance.Forexample,aluminumalloy,titanium,orsteelhavebeenusedtomanufacturerockerarms.

Inconclusion,thewearresistanceandservicelifeofacoldextrudedcastironrockerarmcanbeimprovedbyoptimizingmaterials,manufacturingprocesses,lubricationcondition,andoperatingconditions.Regularmai