filtre en mousse c\u00e9ramique<\/a> plaque, et elle peut \u00eatre mise en production sans qu'il soit n\u00e9cessaire de tester l'effet de l'aluminium en fusion.<\/p>\nLa qualit\u00e9 de l'aluminium liquide produit par ce proc\u00e9d\u00e9 est m\u00e9diocre, le niveau de production est faible et le co\u00fbt est \u00e9lev\u00e9.<\/p>\n
Certaines entreprises de grande et moyenne taille sp\u00e9cialis\u00e9es dans le moulage sous pression d'alliages d'aluminium ont g\u00e9n\u00e9ralement recours \u00e0 des m\u00e9thodes telles que la fusion centralis\u00e9e, l'\u00e9vacuation des scories dans le four, la sous-traitance des op\u00e9rations de d\u00e9gazage et de traitement des scories, puis le transfert vers le four pour organiser la production.<\/p>\n
Pour certaines pi\u00e8ces moul\u00e9es soumises \u00e0 des exigences \u00e9lev\u00e9es, ces entreprises ont g\u00e9n\u00e9ralement recours \u00e0 un four de fusion en continu comme four d'atelier.<\/p>\n
L'aluminium en fusion est d\u00e9sa\u00e9r\u00e9 en continu \u00e0 l'aide d'un gaz inerte, puis filtr\u00e9 \u00e0 l'aide d'une mousse c\u00e9ramique afin d'obtenir des pi\u00e8ces moul\u00e9es.<\/p>\n
Le mat\u00e9riel de d\u00e9gazage fait tourner un injecteur plong\u00e9 dans la masse fondue afin que le gaz de purge (g\u00e9n\u00e9ralement un gaz inerte) soit r\u00e9parti dans la masse fondue sous forme de petites bulles, dans le but de purifier la masse d'aluminium fondue et d'en \u00e9liminer l'hydrog\u00e8ne.<\/p>\n
Moins les bulles sont \u00e9limin\u00e9es fr\u00e9quemment, meilleur est le d\u00e9gazage de la masse fondue et il n'y a pas d'impuret\u00e9s sous forme d'oxyde.<\/p>\n
Les \u00e9quipements de d\u00e9gazage permettent non seulement de purifier l'aluminium fondu lors du processus de d\u00e9gazage, mais aussi d'\u00e9liminer les r\u00e9sidus d'oxyde pr\u00e9sents \u00e0 la surface \u00e0 l'aide d'une chicane (lame) lorsqu'ils fonctionnent correctement.<\/p>\n
Le d\u00e9gazage rotatif est g\u00e9n\u00e9ralement utilis\u00e9 en association avec un gaz inerte, tel que l'azote, adapt\u00e9 \u00e0 la masse fondue concern\u00e9e.<\/p>\n
Dans certains cas, les gaz de purge inertes sont \u00e9galement m\u00e9lang\u00e9s \u00e0 de faibles concentrations (< 2,5%) d'hexafluorure de soufre ou de chlore.<\/p>\n
Dans la masse d'aluminium fondu, la teneur en hydrog\u00e8ne est consid\u00e9rablement r\u00e9duite par rapport aux autres m\u00e9thodes de purge, gr\u00e2ce \u00e0 la r\u00e9partition homog\u00e8ne du gaz de purge dans le rotor.<\/p>\n
Gr\u00e2ce \u00e0 ce principe, il est possible de nettoyer pratiquement n'importe quelle surface de bain, d'obtenir une r\u00e9partition tr\u00e8s large des bulles dans l'ensemble de la cuve de traitement et de r\u00e9duire la dur\u00e9e du traitement gr\u00e2ce \u00e0 un d\u00e9gazage et \u00e0 une purification de la masse fondue efficaces.<\/p>","protected":false},"excerpt":{"rendered":"
In aerospace industry, the requirements of casting aluminum alloy castings are very high. Most companies still use inert gas rotary degassing and slag removal operations…<\/p>","protected":false},"author":1,"featured_media":5677,"comment_status":"closed","ping_status":"closed","sticky":false,"template":"","format":"standard","meta":{"footnotes":""},"categories":[233],"tags":[],"class_list":["post-5676","post","type-post","status-publish","format-standard","has-post-thumbnail","hentry","category-blog"],"yoast_head":"\n
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