Qhov kawg atricle qhia tau hais tias muaj feem cuam tshuam ntawm corundum refractory bricks nyob rau hauv txoj kev tsim, nqe lus no feem ntau qhia txog cov teeb meem tshwm sim ntawm corundum refractory cib hauv kev tsim cov txheej txheem.
Feem ntau cov teeb meem tshwm sim thaum lub sij hawm molding txheej txheem yog:
(1) Lub cev tawg lossis tawg. Qhov tshwm sim no feem ntau yog tshwm sim los ntawm qhov tseeb tias huab cua hauv av nkos tsis tau tawm tag nrho tsuas yog vim li cas ntawm cov pwm. Cov dej noo ntau dhau kuj ua rau spallation. Cov hmoov zoo ntau dhau thiab siab dhau heev yuav ua rau spallation.
(2) Qhov ntom ntawm cib tsis sib xws. Thaum lub cib raug nias, muaj kev sib txhuam tsis sib haum ntawm cov khoom, nruab nrab ntawm cov khoom thiab cov pwm phab ntsa, uas cuam tshuam cov kev sib kis ntawm lub siab thiab ua rau tsis sib xws ntawm txhua feem ntawm lub cib, uas ua rau sib txawv compactness ntawm txhua feem.
Tsis tas li ntawd, qhov sib piv (H / D) ntawm qhov siab qhov siab ntawm lub cib thiab qhov chaw compressed kuj yog ib qho tseem ceeb uas ua rau tsis sib xws. Qhov ntau dua H / D, qhov sib npaug ntawm qhov sib kis ntau dua; nyob rau hauv cov kev taw qhia pressing, lub siab txo nyob rau hauv lem los ntawm nias nto raws li qhov siab ntawm lub cib, thiab qhov ceev ntawm lub cib yog correspondingly los ntawm nruj kom xoob, raws li qhia nyob rau hauv daim duab 1. Yog hais tias ob-sided siab yog siv, lub Ntov ntawm cov cib yog ntom thiab sab thiab sib npaug hauv nruab nrab. Yog li ntawd, txhawm rau txo qhov sib txawv ntawm qhov sib txawv ntawm cov cib tsim, nws yog ib qho tsim nyog yuav tsum tau them sai sai rau qhov tsim nyog ntawm cov pwm thiab cov txheej txheem ntawm kev tsim thiab nias.
Rau cov khoom uas muaj cov duab complex, corundum av nkos yuav tamped nrog ib tug huab cua rauj los xyuas kom meej tib lub ntom li semi-qhuav pressed bricks nrog ib tug siab ntawm 80 ~ 100MPa. Lub ntsiab tsis zoo ntawm ramming yog phau ntawv ua haujlwm, uas yog maj mam hloov los ntawm kev vibration thiab isostatic nias.
Siv kev vibration molding, cov khoom lag luam tuaj yeem yooj yim compacted nyob rau hauv thaum ntxov theem ntawm kev co. Lub ntsiab kom zoo dua ntawm no molding yog lub cib tsis nthuav elastically. Lub siab exerted thaum lub sij hawm av nkos vibration yog heev sib xws thiab tsim nyog, uas yuav ua tau kom lub nruj tshaj plaws tsub zuj zuj ntawm av nkos hais. Cov kev vibration parameter muaj kev cuam tshuam ntau dua ntawm qhov ceev tshaj qhov siab. Lub dispersion thiab particle tis ntawm cov hmoov zoo muaj ib qho tseem ceeb ntawm lub compactness ntawm cov khoom. Kev siv cov khoom loj yog yooj yim dua los ua kom qhov ntom ntawm cov khoom ntau dua li cov khoom me me. Ua kom cov ntsiab lus ntawm cov hmoov zoo yuav txo qhov ceev ntawm lub cib. . Qhov kev vibration zoo tshaj plaws rau kev tsim cov khoom corundum yog: qhov tsawg kawg nkaus noo noo cov av nkos yog 6.5 feem pua ~ 7 feem pua. Lub amplitude yog 1.0~ 1.25mm, thiab lub vibration zaus yog 2500 ~ 3000 zaug / min. Kev ua haujlwm ntawm cov khoom siv vibration-formed corundum yog qhov zoo dua li cov khoom tsim compression, xws li porosity sib haum rau 18.6 feem pua thiab 21.9 feem pua, thiab compressive zog ntawm 162MPa thiab 94MPa.
Nyob rau hauv xyoo tas los no, kev tsim cov khoom siv sintered corundum kuj tau siv isostatic nias. Txhawm rau kom ntseeg tau tias cov cib muaj qhov yuav tsum tau ua rau sab nraud, lub zog siab thiab kev ua haujlwm siab, ua ntej isostatic nias, cov hmoov zoo yuav tsum tau khiav tawm thiab vibrated hauv cov qauv, uas txawv ntawm kev co molding. Lub sijhawm zoo rau alumina hmoov zoo kom ncav cuag qhov ntom ntom los ntawm kev co yog 60~80s; nce lub load tuaj yeem txhim kho kev ua haujlwm ntawm kev vibration densification, thiab qhov zoo tshaj tus nqi yog 0.06 ~ 0.12MPa. Lub amplitude yog nce los ntawm 0.1 mus rau 1 hli, uas ua rau cov cib vibrate thiab compact, thiab compression npaum li cas ntawm cov khoom yuav nce, thiab nqus tsev vacuuming yuav ua rau kom tus nqi compression.
Kev vibration ua rau lub cib compact, thiab nws cov nqi compression feem ntau cuam tshuam nrog cov khoom ntawm cov hmoov zoo. Qhov ntau ntom ntawm cov hmoov txo qis thiab cov nyiaj compression nce. Qhov nce ntawm lub kaum sab xis ntawm cov khoom tuaj yeem txo qhov cuam tshuam ntawm qhov ntom ntom ntawm cov nyiaj compression. Rau cov ntaub ntawv nrog lub me me ntuj repose lub kaum sab xis, txawm tias cov khoom siv pub dawb rau hauv pwm, cov khoom yuav nyob ze rau qhov ntom ntom ntom ntom ntom ntom ntom ntom ntom ntom ntom ntom ntom ntom ntom ntom. Txhawm rau txhim kho cov khoom ntawm cov khoom nyob rau hauv lub tshuab nqus tsev vibration thiab hydrostatic siab, tshuaj tsuag kom qhuav los yog lwm txoj kev yuav tsum tau siv los ua granulate cov khoom, uas yog, los ua cov khoom cuav, kom cov khoom muaj qhov tsim nyog particle muaj pes tsawg leeg ({{{ {2}}}}.1 ~ 0.3mm) thiab cov heap loj heev. ceev.
Nyob rau hauv txoj kev no, los ntawm isostatic nias ntawm nplua-grained corundum av nkos, loj cib ntawm 2.41m × 1.22m × 1.22m tuaj yeem tau, thiab los ntawm quasi-isostatic nias, cov khoom ntawm φ20 ~ 90mm tuaj yeem tau. Tsis tas li ntawd, cov txheej txheem ib nrab qhuav ntawm kev sib txhuam cib xovxwm yuav tsum nruj me ntsis siv txoj kev ua haujlwm ntawm thawj lub teeb thiab tom qab ntawd hnyav, thiab ua kom cov cua tshuab kuj yog ib txoj hauv kev zoo los ua kom qhov ntom ntom ntawm corundum refractory cib.
Cov tsim corundum refractory bricks yuav tsum nruj me ntsis soj ntsuam rau cov tsos tsis xws luag xws li cov duab, qhov ntev kam rau ua, ceev, tsis muaj npoo thiab ces kaum, kab nrib pleb, spalling, ces kaum, thiab parallelism raws li tus qauv kev cai. Cov cib tsim nyog raug xa mus rau ziab.
