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2018-11-27 17:00:00
Description of control system for well vacuum furnace
Descriptionofoperationsystemofwellvacuumfurnace:Thewell-typevacuumfurnacecontrolsystemusestemperaturecontrolthermocoupleandShanghaiGuolongintelligentdigitaldisplaytemperaturecontrolinstrumenttocontroltemperature.Thetemperaturecontrolinstrumentcanbeoperatedaccordingtothesettemperature,andcandisplaytheoreticalandmeasuredvalues.Thetemperaturecontrolsystemalsohasthefunctionofover-temperatureacoustoopticalarm.ThetemperaturerecorderofthecontrolsystemusesShanghaiDahuaChangtutemperaturerecordertorecordthefurnacetemperature.ThethermocoupleisKtype.Thecompensatingwireforfurnacetemperaturemeasurementisconnectedfromtheinstrumentcabinettothethermocoupleofthefurnacebodyandsuppliedbythesupplier.High-powerthyristorzero-crossingtriggersystemwithradiatorandair-cooledsystemisselectedfortheoperationandexecutionsystem.Atthesametime,itisequippedwithautomaticairswitchandfastmelterforsecondarymaintenance.Theon-offinstructionsofammeters,voltmetersandelectrothermalelementsaresetforeachgroupofelectrothermalelements,whichhavethemeasuresofinterlockingmaintenanceandsafegrounding.
2018-11-27 16:59:00
Precautions before and after use of trolley annealing furnace
Inordertofacilitatetheheatingoflargeworkpieces,atrolleytypefurnacesuitableforheatingingotsandbilletsispresented,andawelltypefurnaceisalsopresentedforheatinglongrods.Sincethe1920s,variousmechanizedandactivefurnaceshaveemerged,whichcanimprovetheoutputrateoffurnacesandtheworkingconditions.Withthedevelopmentoffuelresourcesandtheadvancementoffuelconversiontechnology,thefueloftrolleyannealingfurnacehasgraduallychangedfromsolidfuelssuchaslumpcoal,cokeandpulverizedcoaltogaseousandliquidfuelssuchasproducergas,citygas,naturalgas,dieseloilandfueloil,andvariousincinerationscorrespondingtothefuelsusedhavebeendeveloped.Burningequipment.Thestructure,heatingtechnology,temperaturecontrolandatmosphereoftrolleyannealingfurnacewilldirectlyaffectthequalityofprocessedproducts.Intheheatingfurnaceofcasting,improvingtheheatingtemperatureofmetalscanreducethedeformationresistance,buttoohightemperaturecancausegraingrowth,oxidationoroverheating,whichseriouslyaffectsthequalityoftheworkpiece.Intheprocessofheattreatment,ifthesteelisheatedtoapointabovethecriticaltemperatureandthensuddenlycooled,thehardnessandstrengthofthesteelcanbeimproved;ifthesteelisheatedtoapointbelowthecriticaltemperatureandthenslowlycooled,thehardnessofthesteelcanbereducedandthetoughnesscanbeimproved.Inordertoobtainworkpieceswithaccuratescaleandsmoothappearance,ortoreducemetaloxidationinordertoachievethepurposeofprotectingdiesandreducingprocessingallowance,variouskindsoflessoxidation-freeheatingfurnacescanbeselected.Inanopenflamefurnacewithlittleornooxidation,therecoverygasisproducedbyincompleteincinerationoffuel,inwhichtheoxidationlossratecanbereducedtolessthan0.3%byheatingtheworkpiece.Controllableatmospherefurnaceismanuallypreparedatmosphere,whichcanbeusedforgascarburizing,carbonitriding,brightquenching,normalizing,annealingandotherheattreatmenttoachievethepurposeofchangingthemetallographicarrangementandimprovingthemechanicalpropertiesoftheworkpiece.Inthemovableparticlefurnace,theburninggasoffuelorotherfluidizersappliedexternallyareusedtoflowthroughthegraphiteparticlesorotherlazyparticlelayersonthebedforcibly.Theworkpieceburiedintheparticlelayersmaybeheatedintensively,andallkindsofnon-oxidizingheatingsuchascarburizingandnitridingcanalsobecarriedout.Inthesaltbathfurnace,moltensaltliquidisusedasheatingmediumtopreventoxidationanddecarbonizationoftheworkpiece.Castironsmeltingincupolaisusuallyinfluencedbycokequality,airsupplymethod,burdenconditionandairtemperature,whichmakesthesmeltingprocessdifficulttobestableandhighqualityhotmetaldifficulttobeobtained.Hotblastcupolacaneffectivelyimprovehotmetaltemperature,reducealloyburningloss,andreducetheoxidationrateofhotmetal,thusproducinghigh-gradecastiron.Withtheappearanceofcorelessinductionfurnace,cupolahasgraduallybeenreplaced.Thesmeltingoperationofthisinductionfurnaceisnotconstrainedbyanygradeofcastiron.Itcanquicklychangefromsmeltingonegradeofcastirontosmeltinganothergradeofcastiron,whichisconducivetoimprovingthequalityofmolteniron.Somespecialalloysteels,suchasultra-lowcarbonstainlesssteelandsteelsforrollsandsteamturbinerotors,needtomeltmoltensteelfromopen-hearthfurnaceorgeneralelectricarcfurnace,removeimpuritiesinrefiningfurnacethroughvacuumdegassingandargonagitation,andfurtherrefinehighpurityandlargecapacityofhigh-qualitymoltensteel.Flamefurnaceshaveawiderangeoffuelsandlowprices,whichmakeiteasytoadoptdifferentstructuresandreduceproductioncosts.However,flamefurnacesaredifficulttooperateaccurately,whichcausesevereenvironmentalpollutionandlowthermalefficiency.Thecharacteristicsoftheelectricfurnacearethatthefurnacetemperatureisuniformandeasytocompleteactivecontrol,andtheheatingqualityisgood.Accordingtothemethodofenergyconversion,electricfurnacecanbedividedintoresistancefurnace,inductionfurnaceandarcfurnace.Furnaceheatingcapacitycalculatedbyunittimeperunitareaoffurnacebottomiscalledfurnaceyield.Thefastertheheatingrateofthefurnaceandthelargertheloadofthefurnace,thehighertheproductivityofthefurnace.Ingeneral,thehigherthefurnaceyield,thelowertheunitheatconsumptionperkilogramofmaterial.Therefore,inordertoreduceenergyconsumption,full-loadproductionshouldbecarriedout,furnaceproductionrateshouldbeimprovedasfaraspossible,andtheactiveshareoffuelandcombustion-supportingairshouldbeadjustedforincinerationequipmenttopreventexcessorlackofair.Inaddition,thelossofheatstorageandheatdissipationoffurnacewall,heatlossofwatercoolingcomponents,radiationheatlossofvariousopenings,heatlossofoff-furnacefluegasandsoonshouldbereduced.Theratiooftheheatabsorbedbymetalsormaterialswhenheatedtotheheatsuppliedtothefurnaceiscalledfurnacethermalefficiency.Continuousfurnacesaremoreefficientthandiscontinuousfurnacesbecauseoftheirhighproductivityanduninterruptedoperation.Theheatsystemofthefurnaceisinastablestateandthereisnoperiodiclossofheatstorageonthewall.Thereisalsoasectionofpreheatingburdeninthefurnace,andsomewasteheatofthefluegasisduetoapreheatingfurnaceinsidethefurnace.Inthematerialsection,someresidualheatofthefluegasisabsorbedbythecoldworkpieceenteringthefurnac
2018-11-27 16:58:00
Brief Introduction and Process Flow of Box Quenching Furnace
Boxquenchingfurnace,alsoknownasharddieforgingordurableforging,isthewaytoobtaincastingsbypouringmeltedaluminiumalloyintometalmold.Aluminumalloysolidmeltingfurnaceboxquenchingfurnacemostlyusesmetalcoreorsandcoreorshellcore.Comparedwithpressureforging,theremainingservicelifeofaluminiumalloysolidmeltingfurnaceislonger.2,forgingstrengths(1)strengthsThecoolingrateofthemetalmouldisfaster,thecastingstructureisfinerandcanbestrengthenedbyheattreatment.Themechanicalpropertiesofthemetalmouldare15%higherthanthatofthesandforging.Castingqualityisstableinboxquenchingfurnace,surfaceroughnessisbetterthansandforging,andwasterateislow.Goodworkingconditions,highproductivity,easyforworkerstomaster.(2)shortcomingsThethermalconductivityofmetalmoldislargeanditsfillingcapacityispoor.Metalwoodbodyhasnoairpermeability.Itisnecessarytoadoptcorrespondingmeasuresinordertoexhausteffectively.Metalmoldisnon-yieldingandeasytocrackanddeformduringsolidification.
2018-11-27 16:57:00
Brief Introduction and Classification of Basic Structure of Box Quenching Furnace
Boxquenchingfurnaceisaperiodicoperationfurnace,whichissuitablefortheheattreatmentofrodandlongshaftparts.Thestructureoftheboxquenchingfurnaceisthatthefurnacebodyisadeepcylindricalwell,andtheworkpieceisheatedverticallybyaspecialcrane.Thefuelusedisusuallygasandfuel.Whenelectricityisusedasheatsource,itiscalledwellresistancefurnace.Boxquenchingfurnaceisgenerallyplacedbelowtheflooroftheworkshop,butalsoaboveorbelowhalfofthefloor.Thenamesofboxquenchingfurnaceincludeforcedconvectionboxquenchingfurnace,naturalconvectionboxquenchingfurnace,wellgascarburizingfurnace,etc.Theboxquenchingfurnacecanbeheatedeitherbygasorliquidfuelorbyelectricity.Whenusinggasfuel,thereareusuallyseveralsmallenergyburnersinstalledalongthetangentialdirectionoftheinnerwallofthefurnace.Theburnersareevenlyarrangedinlayersorspiralsinheighttoavoidthedirecterosionoftheworkpiecebytheflameandensuretheuniformtemperatureinthefurnace.Whenusedforlowtemperaturetemperingoroilastendermaterial,athinmufflewallisbuiltinthefurnacetoseparatethecombustionspacefromtheheatingspace,buttheboxquenchingfurnacewithmufflewallconsumesmorefuel.
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