{"id":3763,"date":"2020-08-20T07:17:22","date_gmt":"2020-08-20T07:17:22","guid":{"rendered":"http:\/\/www.alalloycasting.com\/?p=3763"},"modified":"2020-08-20T07:17:59","modified_gmt":"2020-08-20T07:17:59","slug":"molten-metal-cleanliness","status":"publish","type":"post","link":"https:\/\/www.alalloycasting.com\/fr\/molten-metal-cleanliness\/","title":{"rendered":"Propret\u00e9 du m\u00e9tal en fusion"},"content":{"rendered":"<p>La propret\u00e9 du m\u00e9tal en fusion constitue l'un des principaux d\u00e9fis pour la plupart des fonderies. Celles-ci doivent produire des brames contenant suffisamment d'hydrog\u00e8ne, de m\u00e9taux alcalins (principalement du sodium) et d'inclusions pour que le produit final soit adapt\u00e9 \u00e0 son utilisation finale. Cela rev\u00eat une importance particuli\u00e8re lorsque la brame est lamin\u00e9e en t\u00f4les minces destin\u00e9es \u00e0 la fabrication de canettes de boisson ou de feuilles d'aluminium.<\/p>\n<p>La propret\u00e9 du m\u00e9tal en fusion doit \u00eatre g\u00e9r\u00e9e de mani\u00e8re ad\u00e9quate, \u00e0 l'aide d'\u00e9quipements adapt\u00e9s et en veillant \u00e0 leur bon fonctionnement.<\/p>\n<h2>Propret\u00e9 initiale du m\u00e9tal en fusion<\/h2>\n<p>Tout d'abord, il convient de s'assurer que les pratiques de fusion et de maintien en temp\u00e9rature mises en \u0153uvre avant la coul\u00e9e sont aussi proches que possible des meilleures pratiques. Plus la propret\u00e9 du m\u00e9tal fondu est \u00e9lev\u00e9e avant le d\u00e9gazage et la filtration, plus la propret\u00e9 sera \u00e9lev\u00e9e apr\u00e8s le traitement. Voici quelques-uns des aspects cl\u00e9s qui n\u00e9cessitent g\u00e9n\u00e9ralement une gestion rigoureuse :<\/p>\n<ul>\n<li>Achetez des m\u00e9taux primaires, des durcisseurs et de la ferraille aupr\u00e8s de fournisseurs \u00e9prouv\u00e9s et qualifi\u00e9s.<\/li>\n<li>Ajout d'\u00e9l\u00e9ments d'alliage (notamment du magn\u00e9sium) \u00e0 la bonne temp\u00e9rature.<\/li>\n<li>D\u00e9graissez soigneusement et nettoyez r\u00e9guli\u00e8rement le four.<\/li>\n<li>Adoptez les mesures qui s'imposent.<\/li>\n<li>R\u00e9duire au minimum les turbulences, en particulier dans les cuves de transfert.<\/li>\n<\/ul>\n<p><img loading=\"lazy\" decoding=\"async\" class=\"alignnone size-full wp-image-3963\" src=\"http:\/\/alalloycasting.com\/wp-content\/uploads\/2020\/08\/Molten-Metal-Cleanliness-1.jpg\" alt=\"Propret\u00e9 du m\u00e9tal en fusion\" width=\"500\" height=\"400\" srcset=\"https:\/\/www.alalloycasting.com\/wp-content\/uploads\/2020\/08\/Molten-Metal-Cleanliness-1.jpg 500w, https:\/\/www.alalloycasting.com\/wp-content\/uploads\/2020\/08\/Molten-Metal-Cleanliness-1-300x240.jpg 300w\" sizes=\"auto, (max-width: 500px) 100vw, 500px\" \/><\/p>\n<h2>D\u00e9gazage et filtration<\/h2>\n<p>Selon le produit, l'\u00e9tape critique suivante peut \u00eatre le d\u00e9gazage. Il existe de nombreux types de d\u00e9gazeurs, mais la plupart fonctionnent \u00e0 l\u2019aide de rotors en rotation. Le rotor injecte des r\u00e9actifs chimiquement actifs (g\u00e9n\u00e9ralement du chlore ou des flux de sel solide) m\u00e9lang\u00e9s \u00e0 des gaz vecteurs (tels que l\u2019argon ou l\u2019azote) dans le m\u00e9tal en fusion sous forme de minuscules bulles. La cl\u00e9 pour exploiter ce type d\u2019\u00e9quipement avec une efficacit\u00e9 optimale r\u00e9side dans la conception et la mise en \u0153uvre du rotor, qui permettent de produire des bulles de plus petite taille et d\u2019allonger leur temps de s\u00e9jour sous la surface.<\/p>\n<p>AdTech en ligne <a href=\"http:\/\/www.alalloycasting.com\/fr\/degassing-unit\/\">unit\u00e9 de d\u00e9gazage<\/a> Utilise une technologie avanc\u00e9e de fusion \u00e0 haute teneur en silicium pour garantir une longue dur\u00e9e de vie ; le rotor de d\u00e9gazage, le manchon de protection du dispositif de chauffage et le manchon de protection du thermocouple sont fabriqu\u00e9s \u00e0 l'aide d'une technologie c\u00e9ramique permettant de r\u00e9pondre aux exigences de production d'aluminium de haute pr\u00e9cision. Le rotor est fabriqu\u00e9 en SiN. Sa dur\u00e9e de vie est de 2 \u00e0 5 ans. Il pr\u00e9sente d\u2019excellentes performances en mati\u00e8re de r\u00e9sistance \u00e0 la corrosion, aux chocs thermiques, \u00e0 l\u2019oxydation, \u00e0 l\u2019abrasion et de r\u00e9sistance m\u00e9canique. Le diam\u00e8tre de l\u2019arbre est de 60 mm et celui de la t\u00eate de 200 mm, ce qui r\u00e9duit la r\u00e9sistance lors de l\u2019agitation. La vitesse de rotation pr\u00e9vue, comprise entre 450 et 550 tr\/min, permet de briser les bulles et de les disperser uniform\u00e9ment dans l\u2019aluminium. Ce mod\u00e8le offre un bon rapport co\u00fbt-efficacit\u00e9 sur le long terme.<\/p>\n<p>AdTech <a href=\"http:\/\/www.alalloycasting.com\/fr\/cff-filter-box\/\">CFF Filtration<\/a> Il est utilis\u00e9 pour le filtrage et la purification de l'aluminium fondu, en association avec un filtre en mousse c\u00e9ramique. Il permet de filtrer les inclusions et les particules infimes pr\u00e9sentes dans l'aluminium fondu. Il est particuli\u00e8rement adapt\u00e9 \u00e0 la coul\u00e9e d'aluminium de haute puret\u00e9 et d'alliages d'aluminium de haute pr\u00e9cision. Il pr\u00e9sente les avantages suivants : r\u00e9sistance thermique, r\u00e9sistance \u00e0 l'oxydation, r\u00e9sistance \u00e0 la corrosion, chauffage rapide, longue dur\u00e9e de vie et r\u00e9sistance aux acides.<\/p>","protected":false},"excerpt":{"rendered":"<p>Molten Metal Cleanliness is one of the major challenges for most foundries. They have to produce slabs that contain enough hydrogen, alkali metals (mainly sodium)&hellip;<\/p>","protected":false},"author":1,"featured_media":3964,"comment_status":"closed","ping_status":"closed","sticky":false,"template":"","format":"standard","meta":{"footnotes":""},"categories":[233],"tags":[4294,396,4287,4288,397,4293,4290,154,4291,4289,4292,4284,4285,1485,4286,4295,4299,4297,4298,4296,4347,4346,4300,1706],"class_list":["post-3763","post","type-post","status-publish","format-standard","has-post-thumbnail","hentry","category-blog","tag-aluminium-degass","tag-aluminium-degassing","tag-aluminium-degassing-flux","tag-aluminium-degassing-nitrogen","tag-aluminium-degassing-process","tag-aluminum-degassing-equipment","tag-aluminum-degassing-flux","tag-aluminum-degassing-process","tag-aluminum-degassing-system","tag-aluminum-degassing-tablets","tag-aluminum-degassing-units","tag-degassing-aluminum-alloys","tag-degassing-aluminum-with-argon","tag-degassing-equipment","tag-degassing-equipment-supplier","tag-degassing-machine","tag-degassing-machine-buy","tag-degassing-machine-coimbatore","tag-degassing-machine-parts","tag-degassing-machine-pune","tag-degassing-with-nitrogen","tag-gridge-degassing-machine","tag-nitrogen-degassing-machine","tag-rotary-degassing-machine"],"yoast_head":"<!-- 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