xov xwm

Cov kev cai yooj yim rau cov ntaub ntawv bearing yog dab tsi?

 

Cov khoom siv feem ntau raucov kabmobyog cov hlau bearing. Cov qauv sab hauv, cov tshuaj lom neeg sib xyaw ua ke, cov khoom tsis yog hlau, qhov loj me thiab kev faib tawm ntawm carbide particle, thiab decarburization degree ntawmcov kabmobmuaj cov kev cai nruj heev. Txwv tsis pub, cov qhov tsis zoo no yuav ua rau lub neej ua haujlwm ntawm cov kabmob thiab kev siv tau ntawm cov khoom siv luv luv.

 

1. Kev dawb huv ntawmKev TuavHlau: Kev qaug zog ntawm cov khoom siv bearing muaj feem cuam tshuam nrog cov khoom tsis yog hlau hauv cov hlau, tshwj xeeb tshaj yog oxides. Qhov no yog vim tias thaum lub bearing tig, qhov chaw sib cuag ntawm cov khoom siv bearing raug rau cov khoom hnyav. Cov khoom tsis yog hlau ua rau muaj kev cuam tshuam hauv zos ntawm kev sib txuas ntawm cov qauv matrix hlau, ua rau muaj kev ntxhov siab, kev hloov pauv yas nyob ib puag ncig cov khoom tsis yog hlau, thiab tsim cov kab nrib pleb me me.

 

Ntxiv mus, cov pa roj (oxygen, nitrogen, hydrogen) hauv cov hlau bearing kuj yog ib qho cim qhia tseem ceeb ntawm kev huv. Cov pa roj uas yaj hauv cov hlau precipitates thaum qhov kub txo qis thiab tsim cov oxide inclusions nrog cov ntsiab lus xws li txhuas, calcium, silicon, thiab manganese. Nitrogen tsim cov txhuas nitride inclusions uas tawg heev thiab cov titanium nitride thiab titanium carbonitride inclusions uas loj heev hauv cov hlau. Thaum cov hydrogen atoms sib sau ua ke los tsim cov hydrogen molecules, lawv tsim cov siab loj heev. Thaum qhov siab no tshaj qhov txwv ntawm cov hlau, cov kab nrib pleb sab hauv tshwm sim, tsim cov pob dawb. Kev txo cov pa roj yog ib kauj ruam tseem ceeb hauv kev txhim kho qhov huv ntawm cov hlau bearing.

 

Nyob rau xyoo tas los no, ntau lub tuam txhab tsim cov hlau loj hauv kuv lub teb chaws tau tsim thiab muab tso rau hauv kev ua haujlwm ntawm cov cub hluav taws xob ultra-high power electric arc furnaces, siv cov thev naus laus zis eccentric hearth tapping rau kev ua kom huv si thib ob. Qhov no txo ​​cov pa oxygen hauv cov hlau kom txog li 10 × 10⁻⁶, nrog rau qee qhov piv txwv tus kheej ncav cuag qis li (4 ~ 3) × 10⁻⁶. Qhov piv txwv ua kom huv si thib ob kuj ncav cuag 100%. Yog li ntawd, tus lej ntawm cov khoom suav nrog hauv cov hlau tau tswj hwm zoo.

 

2. Kev sib npaug ntawmKev TuavHlau

 

Qhov sib npaug ntawm cov hlau bearing yog hais txog qhov sib npaug ntawm nws cov tshuaj lom neeg thiab cov carbides. Cov qauv, qhov hnyav, qhov kub casting, thiab txoj kev casting ntawm cov hlau ingots cuam tshuam rau kev faib tawm ntawm cov tshuaj lom neeg hauv cov hlau. Cov txheej txheem cua sov ntawm cov hlau ingots thiab billets ua ntej ua haujlwm kub, qhov kub xaus ntawm kev ua haujlwm kub, thiab cov txheej txheem txias tom qab, nrog rau cov txheej txheem spheroidizing annealing, cuam tshuam rau qhov sib npaug ntawm cov carbides. Raws li cov duab, kev faib tawm, thiab kev tsim ua rau carbide inhomogeneity hauv microstructure ntawm cov hlau bearing, carbides tuaj yeem faib ua cov kua carbides, banded carbides, thiab network carbides. Qhov tsis zoo ntawm cov kua carbides yog sib npaug rau cov kev suav nrog hauv hlau. Banded carbides ntsuas 3-4 tuaj yeem txo lub neej qaug zog ntawm hlau los ntawm 30%. Kev nce cov network carbides los ntawm ib qib tuaj yeem txo lub neej bearing los ntawm ib feem peb. Qhov loj me ntawm cov carbide me me ncaj qha lossis tsis ncaj qha cuam tshuam rau lub neej bearing. Qhov ntsuas ntawm cov kua carbides, banded carbides, thiab network carbides yog qhov qhia txog carbide uniformity.

 

3. Qhov Ntsuas Qhov Tseeb thiab Qhov Zoo Ntawm Cov Hlau

 

Kev txhim kho qhov tseeb ntawm cov hlau tsis yog tsuas yog ua rau kev siv cov khoom siv bearing ntau dua xwb tab sis kuj txo cov haujlwm machining tsis tsim nyog. Qee lub Hoobkas hlau tau siv cov tshuab dov uas muaj zog heev nrog cov kab kev ntxhov siab luv luv, txo qhov sib txawv ntawm cov hlau hla ntu. Rau cov hlau puag ncig uas muaj txoj kab uas hla tsawg dua 30 hli, qhov sib txawv ntawm txoj kab uas hla tuaj yeem qis li 0.3 hli.

 

Lub neej ntev thiab kev ntseeg tau ntawm cov bearings muaj feem cuam tshuam nrog cov yam xws li kev tsim qauv ntawm cov bearings, cov ntaub ntawv siv, cov txheej txheem ua kub thiab txias thiab cov khoom siv, kev teeb tsa, thiab cov xwm txheej ua haujlwm. Ntawm cov no, cov ntaub ntawv thiab kev kho cua sov yog cov yam tseem ceeb uas cuam tshuam rau lub neej ntev thiab kev ntseeg tau ntawm cov bearings. Vim yog kev cuam tshuam ntawm cov ntaub ntawv thiab cov txheej txheem kho cua sov, cov yam xws li lub zog ntawm cov khoom siv qis, kev ntshiab tsis zoo, kev taw qhia fiber tsis tsim nyog hauv cov ntaub ntawv hlau, qhov nyuaj qis, qhov sib piv forging tsis tsim nyog, thiab kev ntxhov siab ntau dhau tuaj yeem ua rau cov bearings puas tsuaj. Hauv cov tebchaws txawv teb chaws, qhov cuam tshuam ntawm cov hlau zoo rau lub neej ntev ntawm cov bearings yog kwv yees li 50% hauv xyoo 1950 thiab 60, thiab txo qis mus rau ib feem peb hauv xyoo 1980. Tam sim no hauv kuv lub tebchaws, vim yog kev cuam tshuam ntawm cov txheej txheem thiab cov khoom siv, qhov zoo ntawm cov hlau bearings suav txog li 60% ntawm lub neej ntev ntawm cov bearings. Yog li ntawd, rau cov chaw tsim khoom bearings, kev xaiv cov ntaub ntawv bearings tsim nyog thiab zoo kuj yog qhov tseem ceeb hauv kev txhim kho lub neej ntev ntawm cov bearings.