Nrog rau qhov muaj koob meej ntawm cov khoom seem hauv casting ntau lawm, ntau thiab ntau cov neeg ua haujlwm carburizing tau siv hauv cov hlau cam khwb cia.Txawm li cas los xij, ntau tus phooj ywg casting tsis nkag siab txog daim ntawv thov sib txawv carburizing tus neeg sawv cev hauv cov hlau cam sib txawv.Raws li ntau tshaj 10 xyoo ntawm kev paub nyob rau hauv thawj-kab daim ntawv thov kev taw qhia ntawm casting cov neeg muas zaub, lub tuam txhab technology ntawm Yunai summed li cov yam uas cuam tshuam rau tus nqi nqus ntawm casting carburizer rau casting phooj ywg siv.

I. Kev sib xyaw ntawm cov hlau ua kua

Lub melting point ntawm carbon nyob rau hauv lub carburizer yog siab heev (3 727 ℃), uas yog feem ntau yaj nyob rau hauv cov kua hlau los ntawm ob txoj kev ntawm dissolution thiab diffusion.Solubility ntawm carbon hauv kua hlau yog: Cmax = 1.3 + 0.25T-0.3Si-0.33P-0.45S + 0.028Mn, qhov twg T yog qhov kub ntawm cov kua hlau (℃).

1. Kev sib xyaw ua kua hlau.Nws tuaj yeem pom los ntawm qhov sib npaug saum toj no uas Si, S thiab P txo qhov solubility ntawm C thiab qhov nqus ntawm carburizer, thaum Mn yog qhov tsis sib xws.Cov ntaub ntawv qhia tau hais tias qhov nqus ntawm carburant poob los ntawm 1 ~ 2 thiab 3 ~ 4 feem pua ​​​​cov ntsiab lus rau txhua txhua 0.1% nce ntawm C thiab Si hauv cov kua hlau.Qhov nqus tau tuaj yeem nce los ntawm 2% ~ 3% rau txhua 1% Mn nce.Si muaj kev cuam tshuam loj tshaj plaws, ua raws li Mn, C thiab S. Yog li ntawd, hauv kev tsim khoom tiag tiag, C yuav tsum tau ntxiv ua ntej thiab Si yuav tsum tau ntxiv tom qab.

2. Ua kua hlau kub.Qhov sib npaug ntawm qhov sib npaug ntawm cov kua hlau (C-Si-O) muaj kev cuam tshuam zoo rau kev nqus dej.Thaum qhov kub ntawm cov kua hlau yog siab tshaj qhov sib npaug ntawm qhov sib npaug, C reacts nrog O nyiam, thiab qhov poob ntawm C hauv cov kua hlau nce, thiab qhov nqus tau qis dua.Thaum cov kua hlau kub tsawg dua qhov sib npaug ntawm qhov sib npaug, qhov saturation ntawm C txo qis, qhov diffusion tus nqi ntawm C txo, thiab tus nqi nqus tau txo.Thaum cov kua hlau kub sib npaug rau qhov sib npaug ntawm qhov sib npaug, qhov nqus tau siab tshaj plaws.Qhov sib npaug ntawm cov kua hlau (C-Si-O) sib txawv nrog qhov sib txawv ntawm C thiab Si.Nyob rau hauv qhov tseeb ntau lawm, lub carburant ntawm Yu Na hom yog feem ntau yaj thiab diffused nyob rau hauv cov kua hlau nyob rau hauv lub equilibrium kub (1 150 ~ 1 370 ℃).

3. stirring ntawm kua hlau yog conducive rau dissolution thiab diffusion ntawm C, thiab txo qhov tshwm sim ntawm burning ntawm carburizing tus neeg sawv cev floating nyob rau saum npoo ntawm cov kua hlau.Ua ntej tus neeg sawv cev carburizing yog yaj tag, lub sijhawm nplawm ntev dua, qhov siab dua qhov nqus, tab sis nplawm muaj kev cuam tshuam zoo rau lub neej hauv ob sab phlu, tab sis kuj ua rau qhov poob ntawm C hauv cov kua hlau.Lub sijhawm stirring tsim nyog yuav tsum yog luv li sai tau tom qab xyuas kom meej tias lub carburizer yog yaj tag.

4. Slag scraping yog tias nws yuav tsum tau ntxiv tus neeg sawv cev carburizing tom qab liquefaction ntawm hlau, lub cub tawg yuav tsum tau muab ntxuav kom deb li deb tau kom tsis txhob carburizing tus neeg sawv cev qhwv rau hauv slag.

Ob, carburizing tus neeg sawv cev

1. Graphitized microstructure ntawm Yunai hom carburizer.

Txoj kev tshawb no qhia tau hais tias cov qauv ntawm carbon yog amorphous thiab disordered superimposed ntawm amorphous thiab graphite.Nyob rau hauv ib txwm muaj xwm txheej, thaum kub nce mus txog 2500 ℃ thiab tswj tau ib lub sijhawm, tuaj yeem ua tiav cov graphitization.Cov pa roj carbon nyob rau hauv qhov kub thiab txias los yog hauv cov txheej txheem ntawm cov cua sov thib ob, nws tsis yog pob zeb

Lub degree ntawm graphite carbon transformation rau hauv graphitic carbon yog hu ua degree ntawm carbon graphitization, uas kuj yog ib qho ntawm cov khoom xeem ntawm carbon microanalysis.Raws li graphite siv lead ua txoj kev xav, nws tuaj yeem pom tau tias cov qauv graphite yog txheej dav hlau tsim los ntawm hexagonal carbon atom dav hlau network, thiab cov khaubncaws sab nraud povtseg tau txuas nrog ib leeg los ntawm van der Waals quab yuam, yog li tsim cov qauv siv lead ua lattice txuas mus ntxiv. nyob rau hauv peb-dimensional kev taw qhia.X-ray diffraction yog siv los ntsuas qhov kev faib ua feem ntawm ib txwm hexagonal siv lead ua duab tom qab graphitization los ntsuas qhov degree ntawm graphitization.

Graphitization degree yog qhov ntsuas tseem ceeb ntawm tus neeg sawv cev carburizing.Cov qib siab ntawm graphitization tuaj yeem tsis tsuas yog nce tus nqi ntawm cov pa roj carbon monoxide, tab sis kuj txhim kho lub peev xwm nucleation ntawm cov kua hlau vim cov nyhuv homoheteronuclear ntawm nws cov qauv nrog kua hlau graphite.Qhov sib txawv loj tshaj plaws ntawm graphitized carburizing tus neeg saib xyuas thiab tus neeg saib xyuas tsis yog graphitized carburizing yog tias graphitized carburizing tus neeg saib xyuas muaj cov nyhuv carburizing thiab qee yam kev cuam tshuam.

2. Raws li cov khoom siv thiab cov yam ntxwv ntawm ntau yam castings, peb muab tshwj xeeb carburizing tus neeg sawv cev rau txhua yam ntawm castings los ntawm kev tswj cov pa roj carbon thiab ntau yam kab kawm indexes.

Cov pa roj carbon monoxide thiab cov hmoov tshauv tsau cov pa roj carbon monoxide yog cov khoom siv zoo ntawm tus neeg sawv cev carburizing, qhov siab dua qhov zoo dua;Tshauv yog qee cov hlau lossis tsis yog xim hlau oxide, yog ib qho impurity, yuav tsum tsawg li tsawg tau.Tus nqi ntawm cov pa roj carbon monoxide thiab cov tshauv nyob rau hauv tus neeg sawv cev carburizing yog ob qho tseem ceeb ntawm qhov no thiab qhov ntawd, cov ntsiab lus siab ntawm cov pa roj carbon monoxide nyob rau hauv carburizing tus neeg saib xyuas, carburizing efficiency kuj siab.Lub carburizer nrog cov hmoov tshauv siab yog ib qho yooj yim rau "coke" thiab tsim ib txheej slag, uas cais cov pa roj carbon monoxide thiab ua rau lawv insoluble, yog li txo cov pa roj carbon nqus.Cov ntsiab lus tshauv siab kuj ua rau cov kua hlau slag, nce lub zog noj, thiab ua rau muaj kev ua haujlwm ntau ntxiv hauv cov txheej txheem smelting.Kev tswj cov kab mob xws li sulfur thiab nitrogen kuj ua rau kev tswj hwm ntawm qhov tsis xws luag ntawm casting.

3. Kev xaiv granularity ntawm carburizing tus neeg sawv cev.

Qhov luaj li cas ntawm cov carburizer yog me me thiab thaj tsam ntawm cov kua hlau sib cuag yog qhov loj, tus nqi nqus yuav siab, tab sis cov khoom zoo yog yooj yim rau oxidized, tab sis kuj yooj yim kom tshem tawm los ntawm huab cua convection los yog hmoov av. ntws;Qhov siab tshaj particle loj yuav tsum tau soluble hauv cov kua hlau thaum lub sijhawm ua haujlwm.Yog tias tus neeg sawv cev carburizing ntxiv nrog tus nqi, qhov loj me tuaj yeem loj dua, nws raug pom zoo kom nyob rau hauv 0.2 ~ 9.5mm;Yog tias nws ntxiv rau hauv cov kua hlau los yog ua ntej kos cov hlau raws li kev kho kom zoo, qhov loj me tuaj yeem yog 0.60 ~ 4.75mm;Yog hais tias carburizing nyob rau hauv lub pob thiab siv raws li pretreatment, particle loj yog 0.20 ~ 0.85mm;Yuav tsum tsis txhob siv cov khoom tsawg dua 0.2mm.Qhov loj me me kuj muaj feem xyuam rau txoj kab uas hla ntawm lub cub tawg, lub qhov cub txoj kab uas hla yog loj, qhov luaj li cas ntawm lub carburizer yuav tsum loj dua, thiab vice versa.

4. Tswj lub super pass Performance index ntawm Yunai hom carburizer.

Yu Nai hom carburant muaj qhov muaj zog heev dhau, qhov tshwj xeeb ntawm thaj chaw ntawm cov pa roj carbon monoxide yog qhov loj, muaj qhov loj dua qhov nkag mus rau hauv cov kua hlau, ua kom nrawm nrawm thiab tawg, tuaj yeem txhim kho qhov nqus ntawm carburant.