{"id":9356,"date":"2021-06-27T06:45:18","date_gmt":"2021-06-27T06:45:18","guid":{"rendered":"http:\/\/www.alalloycasting.com\/?p=9356"},"modified":"2021-06-25T06:51:51","modified_gmt":"2021-06-25T06:51:51","slug":"casting-filters","status":"publish","type":"post","link":"https:\/\/www.alalloycasting.com\/fr\/casting-filters\/","title":{"rendered":"Filtres de casting"},"content":{"rendered":"<p>Les filtres de coul\u00e9e permettent d'\u00e9liminer efficacement les inclusions pr\u00e9sentes dans l'aluminium fondu, d'am\u00e9liorer la structure de la pi\u00e8ce moul\u00e9e, d'optimiser les performances de transformation, de r\u00e9duire les co\u00fbts de transformation, ainsi que d'augmenter le taux de conformit\u00e9 des produits et d'am\u00e9liorer leurs propri\u00e9t\u00e9s m\u00e9caniques.<\/p>\n<p>Les filtres de coul\u00e9e permettent non seulement d'\u00e9liminer efficacement les grosses impuret\u00e9s h\u00e9t\u00e9rog\u00e8nes pr\u00e9sentes dans l'aluminium liquide, mais aussi de filtrer les micro-inclusions qui ne peuvent \u00eatre \u00e9limin\u00e9es par les proc\u00e9d\u00e9s traditionnels. Les atomes d\u2019hydrog\u00e8ne et autres ions nocifs pr\u00e9sents dans l\u2019aluminium liquide \u00e9tant souvent adsorb\u00e9s sur les inclusions, celles-ci peuvent devenir le point de d\u00e9part de la formation de bulles ; ainsi, le filtrage des inclusions permet de r\u00e9duire la quantit\u00e9 de gaz nocifs dans l\u2019aluminium liquide.<\/p>\n<p>Les d\u00e9fauts d'inclusions de scories dans le processus de coul\u00e9e des lingots et des barres d'aluminium ont un impact consid\u00e9rable sur l'efficacit\u00e9 de production et la rentabilit\u00e9 des usines de lingots et de barres d'aluminium. Les inclusions grossi\u00e8res \u00e0 la surface nuisent \u00e0 la finition de surface de la pi\u00e8ce moul\u00e9e et peuvent m\u00eame entra\u00eener son rejet direct. Les d\u00e9fauts d\u2019inclusions sous-cutan\u00e9es ne sont g\u00e9n\u00e9ralement d\u00e9tect\u00e9s qu\u2019au stade de l\u2019usinage, de l\u2019assemblage ou de l\u2019utilisation effective. Par exemple, dans l\u2019atelier d\u2019usinage, la pr\u00e9sence d\u2019inclusions macro ou micro r\u00e9duit l\u2019usinabilit\u00e9 des pi\u00e8ces moul\u00e9es et la dur\u00e9e de vie des outils d\u2019usinage.<\/p>\n<p>Les inclusions pr\u00e9sentes lors du montage ou de l'utilisation r\u00e9duisent les propri\u00e9t\u00e9s m\u00e9caniques ou les performances en service des pi\u00e8ces moul\u00e9es, ce qui peut notamment entra\u00eener des fuites sous pression. Les pi\u00e8ces moul\u00e9es rejet\u00e9es au cours du traitement, du montage ou de l'utilisation entra\u00eenent g\u00e9n\u00e9ralement des pertes plus importantes, car de nombreuses op\u00e9rations ont d\u00e9j\u00e0 \u00e9t\u00e9 effectu\u00e9es auparavant.<\/p>\n<p>L'indice PPI est couramment utilis\u00e9 pour indiquer la taille des pores de <a href=\"http:\/\/www.alalloycasting.com\/fr\/foundry-foam-ceramic-filters\/\">filtres en c\u00e9ramique alv\u00e9ol\u00e9e<\/a>. Un PPI diff\u00e9rent et une \u00e9paisseur diff\u00e9rente de la plaque filtrante ont des effets de filtration diff\u00e9rents sur les particules. Plus le PPI est \u00e9lev\u00e9 et plus l'\u00e9paisseur est importante, meilleur est l'effet de filtration.<\/p>\n<p>En r\u00e8gle g\u00e9n\u00e9rale, l'\u00e9paisseur d'une plaque filtrante standard est de 50 mm. Si elle est trop \u00e9paisse, la vitesse de fusion diminue et il faut augmenter la taille du moule du filtre c\u00e9ramique pour obtenir un d\u00e9bit donn\u00e9. Lorsque l'\u00e9paisseur est fixe, la capacit\u00e9 de r\u00e9tention des particules, en particulier des petites particules inf\u00e9rieures \u00e0 20 \u00b5m, varie en fonction du PPI.<\/p>","protected":false},"excerpt":{"rendered":"<p>Casting filters can effectively remove inclusions in molten aluminum, improve casting structure, improve processing performance, reduce processing cost, and improve product qualification rate and mechanical&hellip;<\/p>","protected":false},"author":1,"featured_media":9357,"comment_status":"closed","ping_status":"closed","sticky":false,"template":"","format":"standard","meta":{"footnotes":""},"categories":[233],"tags":[],"class_list":["post-9356","post","type-post","status-publish","format-standard","has-post-thumbnail","hentry","category-blog"],"yoast_head":"<!-- This site is optimized with the Yoast SEO plugin v27.9 - https:\/\/yoast.com\/product\/yoast-seo-wordpress\/ -->\n<title>Casting Filters, Ceramic Foam Filter for Casting 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