{"id":3121,"date":"2020-07-25T14:12:15","date_gmt":"2020-07-25T14:12:15","guid":{"rendered":"http:\/\/www.alalloycasting.com\/?p=3121"},"modified":"2020-10-19T07:41:42","modified_gmt":"2020-10-19T07:41:42","slug":"ceramic-foam-filters-sizing","status":"publish","type":"post","link":"https:\/\/www.alalloycasting.com\/fr\/ceramic-foam-filters-sizing\/","title":{"rendered":"Dimensionnement des filtres en mousse c\u00e9ramique"},"content":{"rendered":"

Pour obtenir un d\u00e9bit de remplissage du moule optimal, il est important de calculer le dimensionnement ad\u00e9quat des filtres en mousse c\u00e9ramique pour chaque application de coul\u00e9e sp\u00e9cifique. Le filtre doit \u00eatre suffisamment grand pour ne pas ralentir ni obstruer l\u2019\u00e9coulement du m\u00e9tal en fusion, ni se boucher avec des inclusions retenues avant la fin de la coul\u00e9e. Pour se rapprocher au plus pr\u00e8s du d\u00e9bit d'origine non filtr\u00e9, le filtre doit \u00eatre plusieurs fois plus grand que la section d'\u00e9tranglement du syst\u00e8me de coul\u00e9e. Les param\u00e8tres de coul\u00e9e suivants doivent faire l'objet d'une attention particuli\u00e8re.<\/p>\n

Dimensionnement des filtres en mousse c\u00e9ramique<\/h2>\n

Facteurs influant sur le d\u00e9bit : indice de taille des pores du filtre (10, 15, 25) et section de restriction du syst\u00e8me de r\u00e9gulation.<\/p>\n

Facteurs d'obstruction : taille des pores du filtre (10, 15, 25) et qualit\u00e9 de la masse fondue, notamment : mati\u00e8re premi\u00e8re de fusion, composition chimique de l'alliage, traitement de la masse fondue et quantit\u00e9 de m\u00e9tal \u00e0 filtrer.<\/p>\n

Pour obtenir un d\u00e9bit suffisant, le Filtres en mousse c\u00e9ramique<\/a> Le filtre doit \u00eatre dimensionn\u00e9 de mani\u00e8re \u00e0 ce que sa surface frontale soit plusieurs fois sup\u00e9rieure \u00e0 la surface totale de restriction du syst\u00e8me d'injection. \u00c0 mesure que le rapport surface du filtre\/surface de restriction augmente, la vitesse de remplissage du moule augmente de mani\u00e8re exponentielle. Lorsque ce rapport est inf\u00e9rieur \u00e0 quatre, le filtre allonge consid\u00e9rablement la dur\u00e9e de coul\u00e9e par rapport \u00e0 une coul\u00e9e sans filtre.<\/p>\n

Lorsque le rapport entre la surface du filtre et la surface d'\u00e9tranglement est sup\u00e9rieur \u00e0 huit, le temps de coul\u00e9e n'est pratiquement pas influenc\u00e9 par le filtre. Si ce rapport se situe entre quatre et huit, on peut observer une l\u00e9g\u00e8re augmentation du temps de coul\u00e9e.<\/p>\n

Il est g\u00e9n\u00e9ralement recommand\u00e9 d'utiliser un rapport surface de filtre\/surface de \u00e9tranglement d'au moins quatre, mais pour les pi\u00e8ces moul\u00e9es \u00e0 parois minces, ce rapport doit \u00eatre plus \u00e9lev\u00e9. Les tailles de pores plus fines (#15 et 25) augmentent l\u00e9g\u00e8rement la restriction d'\u00e9coulement du filtre et peuvent n\u00e9cessiter une l\u00e9g\u00e8re augmentation de la surface du filtre. En multipliant la surface d'\u00e9tranglement par le rapport surface de filtration\/surface d'\u00e9tranglement souhait\u00e9, on obtient la taille de filtre requise.<\/p>\n

Il est important d'utiliser la surface effective du filtre pour le calcul. La surface effective du filtre correspond \u00e0 la surface d'entr\u00e9e du filtre qui n'est pas recouverte par l'empreinte du moule. Les coefficients d'obstruction doivent \u00eatre utilis\u00e9s \u00e0 titre indicatif. De nombreuses fonderies appliquant de bonnes pratiques de traitement des m\u00e9taux parviennent \u00e0 faire passer un d\u00e9bit d'aluminium par pouce carr\u00e9 bien sup\u00e9rieur \u00e0 celui indiqu\u00e9 dans le tableau.<\/p>","protected":false},"excerpt":{"rendered":"

To obtain an optimum mold fill rate, it is important to calculate the proper Ceramic Foam Filters Sizing for each specific casting application. The filter…<\/p>","protected":false},"author":1,"featured_media":3122,"comment_status":"closed","ping_status":"closed","sticky":false,"template":"","format":"standard","meta":{"footnotes":""},"categories":[138],"tags":[1742],"class_list":["post-3121","post","type-post","status-publish","format-standard","has-post-thumbnail","hentry","category-seo","tag-ceramic-foam-filters-sizing"],"yoast_head":"\nCeramic Foam Filters Sizing,Ceramic Foam Filter Manufacturing Process<\/title>\n<meta name=\"description\" content=\"It is important to calculate the proper ceramic foam filters sizing for each specific casting application, the filter must be large.\" \/>\n<meta name=\"robots\" content=\"index, follow, max-snippet:-1, max-image-preview:large, max-video-preview:-1\" \/>\n<link rel=\"canonical\" href=\"https:\/\/www.alalloycasting.com\/fr\/ceramic-foam-filters-sizing\/\" \/>\n<meta property=\"og:locale\" content=\"fr_FR\" \/>\n<meta property=\"og:type\" content=\"article\" \/>\n<meta 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