Lub tso pa manifold txuas nrog lub cav lub tog raj kheej thaiv, thiab sau cov pa tawm ntawm txhua lub tog raj kheej thiab coj mus rau hauv cov yeeb nkab loj nrog cov kav dej sib txawv. Qhov kev xav tau tseem ceeb rau nws yog kom txo qis qhov tso pa tawm thiab tsis txhob muaj kev cuam tshuam ntawm lub tog raj kheej. Thaum cov pa tawm ntau dhau lawm, yuav muaj kev cuam tshuam ntawm lub tog raj kheej, uas yog, thaum lub tog raj kheej tso tawm, nws tsuas yog tsoo cov pa tawm uas tsis tau tag nrho los ntawm lwm lub tog raj kheej. Nyob rau hauv txoj kev no, lub tso pa tawm kuj yuav nce, yog li txo lub zog tso zis ntawm lub cav. Kev daws rau qhov teeb meem no yog cais cov pa tawm ntawm txhua lub tog raj kheej kom ntau li ntau tau, nrog rau ib ceg rau txhua lub tog raj kheej, lossis ib ceg rau ob lub tog raj kheej, thiab ua kom txhua ceg ntev li ntev tau thiab nws tus kheej molded kom txo tau kev sib nrig sib cuam tshuam ntawm gases. hauv cov kav dej sib txawv.
Lub tso pa tawm yuav tsum coj mus rau hauv tus account lub cav fais fab kev ua tau zoo, lub cav roj kev lag luam kev ua tau zoo, emission qauv, cav nqi, sib piv lub tsheb pem hauv ntej alarm layout thiab kub teb, thiab lwm yam. Cov pa manifolds feem ntau siv nyob rau hauv lub engine tam sim no muab faib ua cam khwb cia hlau manifolds thiab lwm yam. stainless hlau manifolds nyob rau hauv cov nqe lus ntawm cov ntaub ntawv. Los ntawm cov txheej txheem tsim khoom, cov pa tawm manifold tau pom los ntawm cov txheej txheem casting, tshwj xeeb tshaj yog los ntawmploj wax castingvim lawv cov qauv complex.
Cov kev xav tau rau cov pa tawm manifolds
1. Zoo kub oxidation tsis kam
Lub tso pa manifold ua haujlwm nyob rau hauv high-temperature cyclic alternation rau lub sij hawm ntev. Lub oxidation tsis kam ntawm cov khoom nyob rau hauv qhov kub thiab txias ncaj qha cuam tshuam rau lub neej kev pab cuam ntawm lub tso manifold. Ordinary cam khwb cia hlau pom tseeb tsis tuaj yeem ua tau raws li qhov yuav tsum tau ua, thiab cov ntsiab lus alloy yuav tsum tau ntxiv rau cov khoom siv los txhim kho qhov kub-kub oxidation tsis kam ntawm cov khoom.
2. ruaj khov microstructure
Nyob rau hauv thaj tsam ntawm chav tsev kub mus rau qhov chaw ua haujlwm kub, cov khoom siv yuav tsum tsis txhob raug hloov pauv lossis txo qis theem hloov ntau li ntau tau. Vim tias cov theem hloov pauv yuav ua rau lub ntim hloov pauv, kev ntxhov siab sab hauv lossis deformation, cuam tshuam rau kev ua haujlwm thiab lub neej ntawm cov khoom. Yog li ntawd, cov khoom siv matrix yog qhov zoo dua qhov ruaj khov ferrite lossis austenite qauv. Daim ntawv kev puas tsuaj ntawm cam khwb cia hlau qhov chaw ua haujlwm nyob rau hauv qhov kub thiab txias yog feem ntau manifested raws li corrosion nyob rau hauv kub kub. Tom qab cov txheej txheem hauv lub koom haum yog oxidized (xws li graphite carbon), lub ntim ntawm oxide yog ntau dua li qub ntim, ua rau irreversible expansion ntawm lub casting. Piv nrog rau peb daim ntawv graphite ntawm flake, worm thiab spherical, cam khwb cia hlau nrog kheej kheej graphite muaj qhov zoo tshaj plaws kub tsis kam. Yog vim li cas yog tias thaum lub sij hawm solidification txheej txheem ntawm cam khwb cia hlau, flake graphite loj hlob raws li cov theem ua. Thaum kawg ntawm eutectic solidification, graphite nyob rau hauv txhua pab pawg neeg eutectic tsim ib tug nruam branched peb-dimensional daim ntawv. Thaum kub kub, thaum oxygen invades cov hlau, cov graphite yog oxidized los ua ib tug microscopic channel, uas accelerates cov txheej txheem oxidation. Thaum spherical graphite nucleates, nws loj hlob mus rau ib qho loj ib leeg thiab nyob ib puag ncig los ntawm matrix. Nws tshwm sim raws li lub pob sib cais. Tom qab lub pob graphite yog oxidized, tsis muaj channel tsim, yog li tsis muaj zog ntxiv oxidation. Yog li ntawd, qhov kub siab oxidation tsis kam ntawm cov hlau ductile yog zoo dua li ntawm lwm cov ntaub ntawv ntawm graphite, thiab cov oxidized qhov muaj tsawg dua qhov kub siab zog ntawm cam khwb cia hlau dua lwm hom graphite. Vermicular graphite yog nruab nrab ntawm ob.
3. Me thermal expansion coefficient
Ib qho me me thermal expansion coefficient yog qhov tsim nyog los txo qhov kev ntxhov siab thermal thiab thermal deformation ntawm cov pa manifold, thiab yog qhov tsim nyog rau kev txhim kho kev ua haujlwm thiab kev pabcuam lub neej ntawm cov khoom.
4. Zoo heev kub lub zog
Nws yuav tsum ua kom tau raws li qhov tsim nyog lub zog ntawm cov khoom siv thaum siv qhov kub thiab txias.
5. Cov txheej txheem ua tau zoo thiab tus nqi qis
Muaj ntau ntau hom kev kub-resistant thiab high-temperature resistant hlau cov ntaub ntawv, tab sis vim lub complex qauv ntawm lub tso manifold, cov khoom siv los tsim cov pa manifold yuav tsum muaj cov txheej txheem zoo, thiab nws cov nqi yuav tsum tau raws li qhov xav tau ntawm huab hwm coj. kev tsim khoom hauv kev lag luam automotive.
