{"id":7370,"date":"2021-01-06T09:14:26","date_gmt":"2021-01-06T09:14:26","guid":{"rendered":"http:\/\/www.alalloycasting.com\/?p=7370"},"modified":"2021-01-07T09:07:38","modified_gmt":"2021-01-07T09:07:38","slug":"molten-metal-launder","status":"publish","type":"post","link":"https:\/\/www.alalloycasting.com\/fr\/molten-metal-launder\/","title":{"rendered":"Canal de coul\u00e9e pour m\u00e9tal en fusion"},"content":{"rendered":"

Lors du traitement des alliages d'aluminium liquides, on laisse g\u00e9n\u00e9ralement la masse fondue se d\u00e9canter avant la coul\u00e9e afin de pr\u00e9cipiter les particules d'inclusions solides. Ces particules, notamment les oxydes, les borures et les carbures, peuvent \u00eatre nocives si elles sont incorpor\u00e9es dans le produit final. De plus, afin d\u2019\u00e9liminer les m\u00e9taux alcalins de la solution d\u2019aluminium ou de faciliter le nettoyage du four, on a g\u00e9n\u00e9ralement recours \u00e0 la pulv\u00e9risation de chlore ou d\u2019un gaz contenant du fluorure dans toute la masse m\u00e9tallique. Dans certains cas, cela peut entra\u00eener la formation de fines inclusions liquides de chlorure d\u2019aluminium, de chlorure de magn\u00e9sium ou de trichlorure d\u2019aluminium. M\u00eame si la m\u00e9thode de d\u00e9cantation en four est adopt\u00e9e, les particules, dont la taille se situe g\u00e9n\u00e9ralement entre 2 et 200 \u03bcm, p\u00e9n\u00e8trent tout de m\u00eame dans le syst\u00e8me de goulottes de m\u00e9tal en fusion et finissent par se retrouver dans le produit coul\u00e9.<\/p>\n

Afin de rem\u00e9dier \u00e0 ce probl\u00e8me, on recourt souvent \u00e0 diverses techniques bien connues pour traiter le m\u00e9tal liquide et \u00e9liminer les inclusions entre le four de maintien et la machine de coul\u00e9e, en ligne.<\/p>\n

Ces techniques peuvent inclure la flottation \u00e0 mousse, comme celle utilis\u00e9e dans unit\u00e9 de d\u00e9gazage<\/a>, dans lequel des buses rotatives sont utilis\u00e9es pour disperser des bulles d'air inertes ou r\u00e9actives dans toute la masse fondue. Il est \u00e9galement possible d'utiliser un syst\u00e8me de filtration, tel qu'un filtre \u00e0 lit ou un filtre en mousse c\u00e9ramique<\/a>.<\/p>\n

Dans de nombreux cas, les \u00e9quipements de traitement ne parviennent pas \u00e0 \u00e9liminer compl\u00e8tement les inclusions comprises entre 1 et 40 \u03bcm, et dispersent parfois des particules pouvant atteindre 200 \u03bcm, en particulier des inclusions liquides. De plus, il est possible qu\u2019un composite mousse liquide\/gaz se forme dans la chambre de d\u00e9gazage. En raison de leur petite taille et de leur faible diff\u00e9rence de densit\u00e9 effective par rapport au m\u00e9tal en fusion, ces particules ont du mal \u00e0 se d\u00e9poser pendant le temps de s\u00e9jour normal du m\u00e9tal en fusion au cours du processus de transfert. Dans de nombreux cas, la dur\u00e9e de vie du filtre est d\u00e9termin\u00e9e par le moment o\u00f9 la poussi\u00e8re entrante provoque un colmatage. Cela est particuli\u00e8rement vrai pour les filtres fins, dont le mode de fonctionnement principal repose sur la filtration par g\u00e2teau plut\u00f4t que sur la r\u00e9tention en profondeur. De plus, il est bien connu que dans certaines conditions d\u2019\u00e9coulement, comme dans une chambre de d\u00e9gazage, les particules pr\u00e9sentes dans l\u2019aluminium liquide ont tendance \u00e0 s\u2019agglom\u00e9rer.<\/p>\n

\"D\u00e9gazage<\/p>\n

Le m\u00e9tal en fusion est g\u00e9n\u00e9ralement achemin\u00e9 depuis un four de maintien vers une installation de traitement de la fonte, telle que des machines de d\u00e9gazage, des filtres et des machines de coul\u00e9e, en passant par une cuve de lavage ouverte pr\u00e9sentant g\u00e9n\u00e9ralement une section rectangulaire ou un fond incurv\u00e9.<\/p>\n

Le d\u00e9bit de l'aluminium (et de ses alliages) varie g\u00e9n\u00e9ralement entre 100 et 500 kg\/min, en fonction du diam\u00e8tre hydraulique moyen du r\u00e9servoir, ce qui donne un nombre de Reynolds local compris entre 10\u00b3 et 10\u2074.<\/p>\n

On sait bien que les particules d'inclusion pr\u00e9sentes dans l'\u00e9coulement de liquide interagissent avec celui-ci, ce qui les am\u00e8ne \u00e0 se d\u00e9placer avec le champ d'\u00e9coulement ou \u00e0 traverser celui-ci de temps \u00e0 autre, en fonction de la force r\u00e9sultante qui s'exerce sur elles.<\/p>\n

On consid\u00e8re g\u00e9n\u00e9ralement qu'un nombre de Reynolds compris entre 10\u00b3 et 10\u2074 donne lieu \u00e0 une structure d'\u00e9coulement complexe (\u00e9coulement de transition). Pour obtenir un \u00e9coulement enti\u00e8rement laminaire, le nombre de Reynolds doit \u00eatre ramen\u00e9 en dessous de 10\u00b3, tandis que pour un \u00e9coulement enti\u00e8rement turbulent, il doit d\u00e9passer 10\u2074.<\/p>\n

AdTech propose une goulotte r\u00e9fractaire permettant de contr\u00f4ler l'\u00e9coulement du m\u00e9tal en fusion le long de la cuve, afin de r\u00e9duire les inclusions et d'optimiser la capture, l'agglom\u00e9ration et la pr\u00e9cipitation des particules d'inclusions ind\u00e9sirables.<\/p>","protected":false},"excerpt":{"rendered":"

When processing liquid aluminum alloys, the melt is usually allowed to settle before casting to precipitate solid inclusion particles. These particles, especially oxides, borides, and…<\/p>","protected":false},"author":1,"featured_media":7371,"comment_status":"closed","ping_status":"closed","sticky":false,"template":"","format":"standard","meta":{"footnotes":""},"categories":[233,138],"tags":[160,1658,1675,1667,674,676,1672,1665,1544,1662,1661,1673,1670,1660,1671,1668,1663,1674,672,1669,675,96,673,1659,1664,1666,820,33,677,684,1543],"class_list":["post-7370","post","type-post","status-publish","format-standard","has-post-thumbnail","hentry","category-blog","category-seo","tag-aluminum-casting","tag-aluminum-silicate-ceramic-trough","tag-aluminum-silicate-fiber-launder","tag-aluminum-silicate-launder-for-conveying-molten-aluminum","tag-castable-launder","tag-casting-line","tag-ceramic-launder-for-aluminum-casting","tag-ceramic-lining","tag-curved-launder","tag-custom-designed-ceramic-launder","tag-custom-made-ceramic-fiber-launder","tag-customized-ceramic-launder-for-aluminum-foundry-industry","tag-dependable-performance-launders-for-aluminum-alloy","tag-erosion-resistance-ceramic-launder","tag-first-choice-non-sticky-aluminium-easy-flow-launder","tag-heat-resistant-ceramic-launder-for-aluminum-foundry-industry","tag-high-purity-non-sticky-aluminum-ceramic-launder","tag-high-temperature-stable-ceramic-launder-for-aluminum-foudnry-industry","tag-insulating-launder","tag-launders-suitable-for-aluminum-melting-purifyiing-furnace","tag-metal-transfer-runner","tag-metal-transfer-runner-system","tag-molten-aluminium-transfer","tag-non-sticky-aluminium-ceramic-launder","tag-non-sticky-aluminium-ceramic-lining","tag-non-wetting-ceramic-launder-for-aluminum-melts-casting-flow","tag-refractory-casting-launder","tag-refractory-launder","tag-transfer-launder","tag-transfer-trough","tag-trough"],"yoast_head":"\nMolten 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