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2019-08-21
How to Maintain Brake Disc
Ownerswhousuallyliketomaintaintheircarsmayneglectthemaintenanceofbrakediscs.Manyfriendsmaycallthemselvesolddrivers,buttheyprobablydon'tknowmuchaboutbrakediscs.Todaywearegoingtotalkabouthowtomaintainthebrakedisc:thebrakepadsneedtobereplacedwhentheyarebetween30,000and40,000miles,thebrakediscsneedtobereplacedwhentheyareleftto70,000miles,andthebrakepadsneedtobereplacedwhentheyareusedforarelativelyshorttime.Ingeneral,thebrakediscsarereplacedaftertworeplacements,andtherearbrakesneedtobereplacedbetween80,000and100,000miles.Toreplacethebrakeoil,thebrakeoilhaswaterabsorption.Ifthebrakeoilischangedfromtimetotime,themoisturecontentofairwillbeabsorbedinthebrakeoilandthemoisturecontentwillbeincreased.Whenthemoisturecontentreachesacertainconcentration,thehightemperatureproducedbybrakingwillmakebrakeoilboilandproducebubbles.
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2019-08-21
Basic knowledge of brake discs
Brakesarenowdiscbrakesanddrumbrakes,andmanyoftheoldercarsarefrontandreardrums.Nowadays,manycarsarediscbrakedbothfrontandrear.Becausethediscbrakehasbetterheatdissipationthanthedrumbrake,itisnoteasytoproducethermalrecessionundertheconditionofhigh-speedbraking,soitshigh-speedbrakingeffectisgood.Theprincipleofthebrakediscisthatthemainsourceofthebrakeisfriction.Byusingthefrictionbetweenthebrakepadandthebrakedisc(drum)andthetireandtheground,thekineticenergyofthevehiclemovingisconvertedintotheheatenergyafterfriction,andthecarstops.Agoodbrakingsystemcanprovidestable,sufficientandcontrollablebrakingforce,andhasgoodhydraulictransmissionandheatdissipationabilitytoensurethattheforceappliedbythedriverfromthebrakepedalcanbefullyandeffectivelytransmittedtothemainandsub-pumps,andtoavoidhydraulicfailureandbrakingdeteriorationcausedbyhighheat.Materialdeterminesthelevelofbrakingandwearrate,likethebrand-newsharpmajorityofcarownersreflecttheabnormalbrakingnoiseisbecauseofthematerialoftherearbrakepad,afterreplacingtheimportedbrakepad,theproblemissolved.Incaseofexcessivewearandthinningofthebrakepads,itisnecessarytoreplacethemintimesoasnottocausedirectcontactbetweenthesteelplateandthebrakedisc,resultinginlossofbrakingeffectanddamageofthebrakedisc.Thebrakedisc,whichisactedbythebrakepadandrotateswiththetire,iscalledthebrakedisc.Usually,theownercanjudgethebrakediscbythesoundofdailybrake,especiallywhenthevehiclehasbeenusedforalongtime,itcanalsobeusedtojudge,forexample,whenthebrakepadrubsagainstthebrakediscfilamentorloudsound,ifthissituationisfound,youcantrytwicemoretopreventitfromoccurring.Whenthebrakepadsarerunninginandoutatthebeginningofinstallation,theheatrecessionofthebrakediscislow,therecoveryperformanceisgood,andthebrakingperformanceofmountainroadsandhigh-temperatureandhigh-speedconditionsisnotreduced.Toacertainextent,itimprovesthesafetyofvehicles.Itisverysuitableformountainroadarea,highwayandotherroadconditions!
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2019-08-21
Causes of Brake Drum Cracking
Brakedrumisalsocalledbrakepot.Brakedrumisakeypartinthebrakesystemofautomobiles.Thequalityofbrakedrumdirectlydeterminestheeffectofself-braking,andevenrelatestothesafetyofdriving.Therefore,itisveryimportanttoselectaqualifiedbrakedrumforautomobiles.Belowisasmallbraidtoletyouknowwhatcausesthebrakedrumcracking?Duringthebrakingprocess,becauseofdryfrictionandhighfrictionforce,thebrakedrumoftenbecomesoverheatedandreddened.Atthistime,workersoftenpourtapwateronthebrakedrumtoreduceitstemperature.Thebrakedrumrubscontinuouslyandintenselytoproduceheat,whichmakesitssurfacetemperaturerise.Usingtapwatertoreducethetemperatureofbrakedrumhasplayedaroleinquenching,whichincreasesthelocalhardnessofthesurface,internalstressandcoldbrittleness.Atthesametime,duetotherepeatedactionoftangentialforce,localcrackinitiationoccursatthesurfacelayerofmassivecarbidesandinclusions.Withtheeffectofirregularalternatingimpactforce,thecrackpropagationisaccelerated.
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2019-08-21
Why does the brake drum fail in operation?
Intheuseofautomobilebrakedrum,ifthefailureofbrakedrumoccurs,itwillbringusdanger.Whatcausesthefailureofbrakedruminoperation?Nowlet'sgettoknowitwithXiaobian.Samplingandanalysisoffailurebrakedrum(includinglongitudinalcracking,creepcrackingandhardspotbrakedrum),theworkingenvironmentofbrakedrumisrelativelybad,undertheimpactthermalstresscausedbyfrequentbraking(sentencebrakingisequivalenttoimpactthermalstress),inonecase,therateofheatingorcoolingisgreaterthan93ortherateofheatingandcoolingisfastandHeatingissmallanduniform,andheatshockoccurswhentemperaturecrossesover102incastings.Becausethebrakedrumheatdissipationconditionsaresmall,leadingtotemperaturerise.Whenthetemperaturereachesabout730C,ifthestabilityofpearliteissmall,itwilldecompose,volumewillexpandandcausephasechangestress.Ifthepeakvalueofthesuperpositionofthediurnalstressandthermalstressexceedsthethermalfatiguestress,thermalfatiguecrackingwilloccur.Similarly,ifthethermalfatiguestressexceedsthethermalfatiguestress,thermalfatiguecrackingwilloccur.Atthistime,theenvironmentalhistoryisbadorthethermalconditionispoor,andthetemperaturerisesabovetheeutectoidtransformationtemperaturetoformaustenite.Understrongcoldconditions,suchaswatercoolingorstrongwindcooling,hardeningphasessuchasmartensite,bainiteorsorbitewillbeformed.Thisiswhythefailurebrakedrumcracksandformshardspotsonthesurfaceatthesametime.Because.
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