{"id":2453,"date":"2020-06-28T09:56:28","date_gmt":"2020-06-28T09:56:28","guid":{"rendered":"http:\/\/alalloycasting.com\/?p=2453"},"modified":"2020-09-28T06:15:54","modified_gmt":"2020-09-28T06:15:54","slug":"filtration-in-foundries","status":"publish","type":"post","link":"https:\/\/www.alalloycasting.com\/fr\/filtration-in-foundries\/","title":{"rendered":"La filtration dans les fonderies"},"content":{"rendered":"

La filtration des alliages d'aluminium peut \u00eatre divis\u00e9e en plusieurs \u00e9tapes, en fonction du type de technologie utilis\u00e9e pour la production de pi\u00e8ces moul\u00e9es ou de la m\u00e9thode de pr\u00e9paration du m\u00e9tal liquide. La fabrication des alliages d\u2019aluminium r\u00e9pond aux exigences de puret\u00e9 accrue du m\u00e9tal coul\u00e9, afin d\u2019am\u00e9liorer la qualit\u00e9 des produits interm\u00e9diaires destin\u00e9s \u00e0 la production finale (feuilles, blocs, lingots, barres, profil\u00e9s, etc.). Ainsi, la filtration dans les fonderies contribue \u00e0 r\u00e9duire le taux de rebut lors de la fabrication du produit final et \u00e0 am\u00e9liorer sa qualit\u00e9.<\/p>\n

Filtration des alliages d'aluminium<\/h2>\n

La coul\u00e9e des m\u00e9taux s'effectue sur ces sites par campagnes continues ou discontinues, portant sur des quantit\u00e9s allant de quelques tonnes \u00e0 plusieurs centaines de tonnes ; c'est pourquoi on utilise des filtres de grande surface pour la filtration. Ceux-ci sont plac\u00e9s dans le syst\u00e8me de distribution du m\u00e9tal en fusion. Nous recommandons d'installer les filtres dans des caissons de filtration en c\u00e9ramique, selon une disposition horizontale ou verticale.<\/p>\n

\"La<\/p>\n

Filtre pour aluminium en fusion<\/h2>\n

Le filtres en mousse c\u00e9ramique<\/a><\/strong> adapt\u00e9s \u00e0 une sollicitation thermique prolong\u00e9e, peuvent \u00eatre utilis\u00e9s pour la filtration. Les filtres en aluminium fondu sont g\u00e9n\u00e9ralement disponibles dans les dimensions normalis\u00e9es indiqu\u00e9es en pouces, avec une porosit\u00e9 comprise entre 10 et 60 PPI (pores par pouce lin\u00e9aire). La taille d\u2019un filtre en mousse c\u00e9ramique d\u00e9pend de sa porosit\u00e9 et est choisie en fonction de la capacit\u00e9 de filtration, de la dur\u00e9e de coul\u00e9e et de la configuration de la bo\u00eetier de filtration<\/a><\/strong>. Le choix de la porosit\u00e9 du filtre pour l'aluminium fondu d\u00e9pend de l'alliage utilis\u00e9, de la temp\u00e9rature de coul\u00e9e, de la contamination du m\u00e9tal et de la qualit\u00e9 requise du produit fini.<\/p>\n

Avant sa mise en service, le filtre doit \u00eatre pr\u00e9chauff\u00e9 de mani\u00e8re ad\u00e9quate afin de garantir son bon fonctionnement. Une fois la campagne termin\u00e9e, le filtre peut \u00eatre r\u00e9utilis\u00e9 si le caisson de filtration est \u00e9quip\u00e9 d'un syst\u00e8me de chauffage permanent. Si le m\u00e9tal se d\u00e9pose dans le filtre en mousse c\u00e9ramique<\/a>, il faudra le remplacer avant la prochaine campagne de coul\u00e9e.<\/p>\n

La filtration dans les fonderies<\/h2>\n

La pollution du m\u00e9tal en fusion par des oxydes durs, qui entra\u00eene des probl\u00e8mes lors de la finition des pi\u00e8ces moul\u00e9es, est la principale raison justifiant la mise en place de la filtration des pi\u00e8ces moul\u00e9es dans les fonderies. L'\u00e9limination des d\u00e9fauts ind\u00e9sirables, tels que l'\u00e9tanch\u00e9it\u00e9 insuffisante de la pi\u00e8ce moul\u00e9e, la porosit\u00e9 (bulles), le manque d'homog\u00e9n\u00e9it\u00e9, etc., qui surviennent souvent uniquement lors de la coul\u00e9e elle-m\u00eame, sous l'effet de la turbulence du m\u00e9tal en fusion dans le moule, constitue la deuxi\u00e8me raison principale justifiant la filtration.<\/p>","protected":false},"excerpt":{"rendered":"

Aluminium alloy filtration can be broken down into several parts, depending on the type of the applied technology of cast production or on the method…<\/p>","protected":false},"author":1,"featured_media":5216,"comment_status":"closed","ping_status":"closed","sticky":false,"template":"","format":"standard","meta":{"footnotes":""},"categories":[233],"tags":[645,21,664,665],"class_list":["post-2453","post","type-post","status-publish","format-standard","has-post-thumbnail","hentry","category-blog","tag-aluminium-alloys-filtration","tag-ceramic-foam-filter","tag-filtration-in-foundries","tag-molten-aluminium-filter"],"yoast_head":"\nFiltration in Foundries,Aluminium Alloys Filtration,Molten Aluminium Filter<\/title>\n<meta name=\"description\" content=\"Molten metal pollution by oxides, causing problems with cast finishing, is the main reason for introduction of cast filtration in foundries.\" \/>\n<meta name=\"robots\" content=\"index, follow, max-snippet:-1, max-image-preview:large, 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