Lub Tshuab Nqus Tsev Induction Melting
Kev siv lub tshuab nqus tsev (vacuum induction melting - VIM) tau tsim los rau kev ua cov hlau tshwj xeeb thiab cov hlau txawv teb chaws, thiab yog li ntawd nws tau dhau los ua qhov siv ntau dua vim tias cov ntaub ntawv siab heev no tau siv ntau dua. VIM tau tsim los yaj thiab pov cov hlau superalloys thiab cov hlau muaj zog siab, ntau yam uas xav tau kev ua haujlwm nqus tsev vim tias lawv muaj cov khoom siv refractory thiab reactive xws li Ti, Nb thiab Al. Nws kuj tseem siv tau rau cov hlau tsis xeb thiab lwm yam hlau thaum xav tau kev yaj zoo thawj zaug.
Raws li lub npe qhia, cov txheej txheem no cuam tshuam nrog kev yaj ntawm cov hlau hauv qab qhov chaw nqus tsev. Electromagnetic induction yog siv ua lub zog rau kev yaj cov hlau. Induction melting ua haujlwm los ntawm kev ua kom muaj hluav taws xob eddy currents hauv cov hlau. Lub hauv paus yog lub induction coil, uas nqa cov hluav taws xob alternating current. Cov eddy currents ua kom sov thiab thaum kawg yaj cov nqi.
Lub cub tawg muaj ib lub tsho hlau uas tsis pub cua nkag, txias thiab dej uas muaj peev xwm tiv taus qhov xav tau ntawm lub tshuab nqus tsev rau kev ua cov hlau. Cov hlau raug yaj hauv lub crucible uas muaj nyob hauv lub kauj induction txias thiab dej, thiab feem ntau lub cub tawg muaj cov khoom siv refractories tsim nyog.
Cov hlau thiab cov hlau sib xyaw uas muaj kev sib raug zoo nrog cov pa roj - tshwj xeeb tshaj yog nitrogen thiab oxygen - feem ntau yog yaj / ua kom zoo hauv cov cub tawg induction nqus tsev kom tiv thaiv kev ua qias tuaj / kev cuam tshuam nrog cov pa roj no. Yog li ntawd, cov txheej txheem feem ntau yog siv rau kev ua cov ntaub ntawv huv si lossis cov ntaub ntawv uas muaj kev kam rau siab rau cov tshuaj lom neeg.
Q: Vim li cas thiaj siv lub tshuab nqus tsev induction melting?
A: Lub tshuab nqus tsev induction melting tau tsim thawj zaug rau kev ua cov khoom siv tshwj xeeb thiab cov khoom siv txawv teb chaws thiab yog li ntawd nws tau dhau los ua qhov tshwm sim ntau dua vim tias cov ntaub ntawv siab heev no tau siv ntau dua. Thaum nws tau tsim rau cov ntaub ntawv xws li superalloys, nws kuj tseem siv tau rau cov hlau tsis xeb thiab lwm yam hlau.
Yuav ua li cas ib tuglub tshuab nqus tsev induction cub tawgua haujlwm?
Cov khoom siv raug them rau hauv lub cub tawg induction hauv qab lub tshuab nqus tsev thiab lub zog raug siv los yaj cov nqi. Cov nqi ntxiv raug ua kom coj cov hlau kua mus rau qhov muaj peev xwm yaj raws li qhov xav tau. Cov hlau yaj raug ua kom huv si hauv qab lub tshuab nqus tsev thiab cov tshuaj lom neeg raug kho kom txog thaum ua tiav cov tshuaj lom neeg yaj raug.
Ua li cas rau hlau hauv lub tshuab nqus tsev?
Tshwj xeeb, feem ntau cov hlau tsim ib txheej oxide rau ntawm txhua qhov chaw uas raug cua. Qhov no ua haujlwm ua ib daim thaiv kom tiv thaiv kev sib txuas. Hauv qhov chaw tsis muaj cua, yog li cov hlau yuav tsis tsim ib txheej tiv thaiv.
Cov txiaj ntsig ntawm VIM Melting
Nyob ntawm cov khoom thiab cov txheej txheem hlau, cov theem nqus tsev thaum lub sijhawm ua kom huv yog nyob rau hauv qhov ntau ntawm 10-1 txog 10-4 mbar. Qee qhov zoo ntawm cov hlau ntawm kev ua haujlwm nqus tsev yog:
Yaj nyob rau hauv huab cua tsis muaj oxygen txwv tsis pub tsim cov oxide uas tsis yog hlau thiab tiv thaiv kev oxidation ntawm cov khoom reactive.
Kev ua tiav ntawm kev sib xyaw ua ke thiab cov roj hauv cov ntsiab lus ze heev
Tshem tawm cov khoom tsis xav tau nrog cov pa siab
Tshem tawm cov pa roj uas yaj - oxygen, hydrogen, nitrogen
Kev kho kom raug thiab homogeneous alloy composition thiab yaj kub
Yaj hauv lub tshuab nqus tsev tshem tawm qhov xav tau lub hau slag tiv thaiv thiab txo qhov muaj peev xwm ntawm kev sib kis slag lossis kev suav nrog hauv cov ingot.
Vim li no, kev ua haujlwm metallurgical xws li dephosphorization thiab desulphurization raug txwv. VIM metallurgy yog lub hom phiaj tseem ceeb rau cov tshuaj tiv thaiv siab, xws li cov tshuaj tiv thaiv ntawm carbon, oxygen, nitrogen thiab hydrogen. Kev tshem tawm cov khoom tsis zoo, volatile, xws li antimony, tellurium, selenium thiab bismuth, hauv cov cub tawg induction nqus tsev yog qhov tseem ceeb heev.
Kev saib xyuas qhov tseeb ntawm qhov kev cuam tshuam ntawm cov pa roj carbon ntau dhau los ua kom tiav qhov deoxidation tsuas yog ib qho piv txwv ntawm cov txheej txheem versatility siv cov txheej txheem VIM rau kev tsim cov superalloys. Cov ntaub ntawv uas tsis yog superalloys raug decarburized, desulfurized lossis xaiv distilled hauv lub tshuab nqus tsev induction kom ua tau raws li cov lus qhia thiab lav cov khoom siv. Vim yog qhov siab vapor ntawm feem ntau ntawm cov ntsiab lus tsis xav tau, lawv tuaj yeem txo qis rau qib qis heev los ntawm kev distillation thaum lub tshuab nqus tsev induction melting, tshwj xeeb tshaj yog rau cov alloys nrog lub zog siab heev ntawm qhov kub ua haujlwm siab dua. Rau ntau yam alloys uas yuav tsum ua tau raws li qhov xav tau zoo tshaj plaws, lub tshuab nqus tsev induction cub tawg yog lub kaw lus melting tsim nyog tshaj plaws.
Cov txheej txheem hauv qab no tuaj yeem ua ke nrog VIM system tau yooj yim los tsim cov yaj huv:
Kev tswj huab cua nrog cov nqi xau thiab cov dej tawm tsawg
Kev xaiv cov khoom siv refractory ruaj khov dua rau cov ntaub thaiv crucible
Kev sib xyaw thiab homogenization los ntawm electromagnetic stirring lossis purging gas
Kev tswj qhov kub kom raug kom txo tau cov tshuaj tiv thaiv crucible nrog cov yaj
Cov txheej txheem deslagging thiab filtering tsim nyog thaum lub sijhawm casting
Kev siv cov txheej txheem ntxuav thiab tundish kom zoo rau kev tshem tawm oxide zoo dua.
Lub sijhawm tshaj tawm: Lub Xya Hli-19-2022
