Poob Wax Investment Castings Rau Automotive Exhaust Manifolds

Khoom Taw Qhia

Cov yam ntxwv thiab cov kev xav tau ntawm cov khoom siv hluav taws xob tso tawm

Cov tsheb pib thaum ntxov muaj lub zog qis hauv ib chav tsev qhov hnyav, tsis muaj roj combustion efficiency, thiab cov pa cua kub tsis tshaj 500 degree. Nrog rau kev txhim kho ntawm kev ua haujlwm ntawm lub tsheb cav, qhov tso cua txias tau nce mus rau 600 ~ 650 degree. Nyob rau hauv xyoo tas los no, cov teb chaws tsim tau tsis tu ncua txhim kho tsheb tso pa tawm cov qauv thiab kev siv cov tshuab catalytic thiab turbocharging tshuab tau nce qhov kub thiab txias ntawm cov pa hluav taws xob ntau, nce mus txog 750 degree. Nrog rau kev txhim kho ntxiv ntawm kev ua haujlwm ntawm lub cav, qhov ua haujlwm kub ntawm cov pa tawm manifold tseem yuav nce ntxiv. Nyob rau tib lub sijhawm, nrog kev nce qib ntawm lub tshuab thev naus laus zis, cov qauv ntawm Poob Wax Investment Castings rau Automotive Exhaust Manifolds kuj nyuaj. Tsis tas li ntawd, nws yuav tsum tau ua hauj lwm nyob rau hauv cov xwm txheej ntawm cyclic thiab alternating kub, uas yuav tsum tau lub tso manifold cov ntaub ntawv uas tsis tsuas yog yuav tsum tau zoo high-temperature kev ua tau zoo tab sis kuj muaj zoo casting zog. Yog li ntawd, cov khoom siv hluav taws xob tso tawm yuav tsum muaj cov yam ntxwv hauv qab no.

1. Zoo kub oxidation tsis kam

Exhaust manifolds ua hauj lwm nyob rau hauv high-temperature cycles thiab alternating tej yam kev mob rau lub sij hawm ntev, thiab oxidation tsis kam ntawm cov ntaub ntawv nyob rau hauv high temperatures ncaj qha cuam tshuam rau lub neej kev pab cuam ntawm pa manifolds. 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. Stable Microstructure

Nyob rau hauv thaj tsam ntawm chav tsev kub mus rau qhov kub thiab txias, cov khoom siv yuav tsum muaj tsawg lossis tsis muaj theem hloov li sai tau. Vim tias cov theem hloov pauv yuav ua rau lub ntim hloov pauv, ua rau muaj kev ntxhov siab sab hauv lossis deformation, cuam tshuam rau kev ua haujlwm thiab lub neej ntawm cov khoom. Yog li, 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 hauj lwm nyob rau hauv high-temperature tej yam kev mob yog mas manifested raws li corrosion nyob rau hauv high-temperature tej yam kev mob. Tom qab cov theem hauv cov qauv yog oxidized (xws li graphite carbon), lub ntim ntawm cov oxide yog loj dua qhov qub ntim, ua rau irreversible expansion ntawm lub casting.

Piv nrog rau peb daim ntawv graphite ntawm flake, worm, thiab spherical graphite, cam khwb cia hlau nrog kheej kheej graphite muaj qhov zoo tshaj plaws kub-resistant. Yog vim li cas yog tias thaum lub sij hawm solidification txheej txheem ntawm cam khwb cia hlau, flake graphite yog cov theem kev loj hlob, thiab thaum lub eutectic solidification xaus, txhua graphite nyob rau hauv lub eutectic pab pawg neeg tsim ib tug tas mus li branched peb-dimensional duab. Thaum kub kub, thaum cov pa nkag mus rau sab hauv ntawm cov hlau tom qab cov graphite yog oxidized, lub microscopic channel yog tsim los ua kom cov txheej txheem oxidation. Thaum spherical graphite nucleates, tom qab loj hlob mus rau ib qho me me ib leeg, nws nyob ib puag ncig los ntawm matrix thiab tshwm sim raws li lub pob sib cais. Tom qab lub pob graphite yog oxidized, tsis muaj channel yuav raug tsim, yog li tsis muaj zog ntxiv ntawm oxidation. Yog li ntawd, qhov kub-kub oxidation tsis kam ntawm nodular cam khwb cia hlau Nws yog zoo dua li lwm hom graphite, thiab cov oxidized pores muaj tsawg dua cov nyhuv ntawm high-temperature zog ntawm cam khwb cia hlau dua lwm hom graphite, thiab vermicular graphite nyob rau hauv nruab nrab.

3. Me me coefficient ntawm thermal expansion

Ib qho me me coefficient ntawm thermal expansion yog qhov zoo los txo cov thermal kev nyuab siab thiab thermal deformation ntawm cov pa manifold, uas yog qhov zoo los txhim kho kev ua haujlwm thiab kev pabcuam lub neej ntawm cov khoom.

4. Lub zog kub kub zoo heev

Yuav tsum ua kom tau raws li qhov tsim nyog lub zog yuav tsum tau thaum cov khoom siv ntawm 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 zoo ntawm cov pa manifold, cov khoom siv los tsim cov pa manifold yuav tsum muaj zoo manufacturability, thiab nws cov nqi yuav tsum tau raws li qhov xav tau ntawm huab hwm coj. kev tsim khoom hauv kev lag luam automotive.

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