Theairholeisthemaindefectintheproductionofthebrakedrumofthebimetalautomobile,andismainlydistributedontheinnerwallandtheouterwallofthebrakedrum.HowcanIpreventitinordertogetacompletebrakedrumcasting?1.Whencastingthebrakedrumcastings,itisnecessarytoreducetheoverheatingtemperatureduringthefinancializationandminimizethecontacttimebetweenthealloyliquidandthegasduringthemelting.Second,wemustpayattentiontothetreatmentofoxidesandstainsonthesurfaceofsteelparts,sothesteelplateshouldbesandblasted;remembertodrythesteel.Third,intheplacewherethecastironandsteelpartsarecombined,itisnecessarytopayattentiontothebrushingofthegetteringpaint.Fourth,opentheexhaust(overflow)riserintheprocesstomakethegasinthecavitytimely

Theairholeisthemaindefectintheproductionofthebrakedrumofthebimetalautomobile,andismainlydistributedontheinnerwallandtheouterwallofthebrakedrum.HowcanIpreventitinordertogetacompletebrakedrumcasting?1.Whencastingthebrakedrumcastings,itisnecessarytoreducetheoverheatingtemperatureduringthefinancializationandminimizethecontacttimebetweenthealloyliquidandthegasduringthemelting.Second,wemustpayattentiontothetreatmentofoxidesandstainsonthesurfaceofsteelparts,sothesteelplateshouldbesandblasted;remembertodrythesteel.Third,intheplacewherethecastironandsteelpartsarecombined,itisnecessarytopayattentiontothebrushingofthegetteringpaint.Fourth,opentheexhaust(overflow)riserintheprocesstomakethegasinthecavitytimely

Thebrakediscofthediscbrakeisaroundplatethatalsorotatesasthecartravels.Thebrakecaliperisusedtoclampthebrakediscandgeneratebrakingforce.Itsrelativelyrotatingbrakediscisfixed.Whenthebrakeisapplied,itclampsthebrakedisctoslowdownorstop.Whatarethereasonsforthebrakeeffectofthebrakediscbetterthanthedrumbrake? Thebrakeforceofthediscbrakeisweak,theactualdrumbrakeareaislarge,thenaturalbrakeefficiencyisnotgood,butthedrumbrakehasthebiggestproblem,theheatisdeclining,andthestronglimitbrakewillcausethebrakedrumtoheatup,eventuallyleadingtothegapchange.Large,thebrakesbecomelongerandeventuallybecomeineffective.However,thedrumbrakeshavelowcostandlargebrakingforce,sothetrucksusedrumbrakes. Manyrearwheelsofthecararealsodrumbrakes,thecostislow,andthepowerofthecarissmall,anditisrarelyusedforextremecontrol,sotherearwheeldrumbrakeisveryeconomical.However,sincethefrontwheelbrakeswith75%oftheforce,itisthefrontandreardrum.Includingalotofrear-drivecars,frontandreardiscbrakes,butalsothefrontbrakediscislarge,thebackissmaller.Thefrontisahollowdisc,thebackisasoliddiscandsoon. However,thediscbrakehasagradualprocess,itiseasytocontrolthebrakingforce,andthebrakedisctouchestheairsurfacewhenitrotateswiththewheel,andtherearefewsignsofthermaldecay.Thebrakecanmaintainagoodbrakingeffectforalongtime.Supersportscars,brakediscswithceramicfibersbeforeandafter,inordertoavoidthermaldecay.

Thematerialofthebrakediscismostlycastiron,anditisexposedforalongtime.Theworkingenvironmentisrelativelyinferior,anditoftenencountersthetestoftwodaysoficeandfire.Ifthevehicleisparkedforalongtime,orwhenitisinadampenvironment,somerustwillbegeneratedonthesurfaceofthebrakedisc.Theserustswillaffectthenormaloperationofthebrakesystem.Therefore,itisnecessaryforustoconsciouslyClear. Ifthereisonlyaslightrustonthesurface,wecanremoveitbycontinuousbrakingwhiledriving.Ofcourse,thisissafeanddoesnotaffectpublictransportation.Whiledriving,gentlypressthebrakestoallowthefrictionbetweenthebrakepadsandthebrakediscto“polish”thesurface. Iftherustsituationisserious,wedonotrecommendusingtheabovemethodofbrakingtoremoverust.Whenthereisalotofrust,thesurfaceofthebrakediscwillbeuneven.Inthiscase,thebrakewillcausethebodytoshake,andthedrivercanobviouslyfeeltheabnormalityofthebrakepedal,thesteeringwheelandthebody.Atthistime,itwillbedifficulttoremovetherust,evenifitisbarely"polished",thebrakepadwillbeabnormallywornafterwards,andtherewillstillbejitter. Therefore,itisbestforustodrivethevehicleintotherepairshop,removethebrakedisc,sandtherustwithsandpaper,checkthesurfaceofthebrakepadforabnormalities,andconductaroadtestafterinstallation.Driveonaflatroadataspeedof70KM/Handperformmultiplebrakingtoensurenoabnormality.Ifthereisstillajittercondition,itmeansthatthesurfaceofthebrakediscisnotflat.Youneedtodofurtherpolishingandlevelingorreplaceitasappropriate.