{"id":9491,"date":"2021-07-08T08:25:49","date_gmt":"2021-07-08T08:25:49","guid":{"rendered":"http:\/\/www.alalloycasting.com\/?p=9491"},"modified":"2021-07-08T08:25:49","modified_gmt":"2021-07-08T08:25:49","slug":"headbox-and-tundish","status":"publish","type":"post","link":"https:\/\/www.alalloycasting.com\/fr\/headbox-and-tundish\/","title":{"rendered":"Chambre d'alimentation et r\u00e9servoir de r\u00e9partition"},"content":{"rendered":"<p>Les buses et l'embout de coul\u00e9e, la caisse d'alimentation moul\u00e9e sous vide et le r\u00e9partiteur constituent les \u00e9l\u00e9ments cl\u00e9s garantissant la production de bobines d'aluminium par coul\u00e9e et laminage.<\/p>\n<p>Apr\u00e8s avoir abaiss\u00e9 la caisse de t\u00eate et le r\u00e9partiteur moul\u00e9s sous vide (\u00e9galement appel\u00e9s <a href=\"https:\/\/www.alalloycasting.com\/fr\/front-box\/\">bo\u00eete avant<\/a>) la temp\u00e9rature, il est possible de r\u00e9duire les d\u00e9fauts li\u00e9s \u00e0 la grossi\u00e8ret\u00e9 du grain caus\u00e9s par une temp\u00e9rature excessive, de limiter la r\u00e9action d'oxydation et de formation de scories de la masse fondue \u00e0 haute temp\u00e9rature, et de garantir la qualit\u00e9 de la t\u00f4le coul\u00e9e-lamin\u00e9e.<\/p>\n<p>En raison de l'augmentation de la vitesse de coul\u00e9e, les particules de la deuxi\u00e8me phase, observables dans la structure \u00e0 fort grossissement de la bobine coul\u00e9e-lamin\u00e9e, sont plus petites, dispers\u00e9es et r\u00e9parties de mani\u00e8re plus homog\u00e8ne. Ces fines particules de compos\u00e9s m\u00e9talliques interm\u00e9diaires permettent d'am\u00e9liorer les propri\u00e9t\u00e9s m\u00e9caniques du mat\u00e9riau et d'augmenter sa r\u00e9sistance sans r\u00e9duire sa plasticit\u00e9.<\/p>\n<p>Gr\u00e2ce \u00e0 l'augmentation de la vitesse de coul\u00e9e-laminage, les conditions de solidification de la masse fondue sont am\u00e9lior\u00e9es, la densit\u00e9 de la structure interne de la bobine coul\u00e9e-lamin\u00e9e est accrue et la qualit\u00e9 de la structure interne est consid\u00e9rablement am\u00e9lior\u00e9e. Cependant, l'augmentation de la vitesse de coul\u00e9e-laminage est \u00e9galement limit\u00e9e \u00e0 une certaine plage. \u00c0 mesure que la hauteur verticale de l'intervalle de cristallisation de l'alliage augmente, la vitesse de coul\u00e9e-laminage doit \u00eatre r\u00e9duite en cons\u00e9quence.<\/p>\n<p><img loading=\"lazy\" decoding=\"async\" class=\"alignnone size-full wp-image-9488\" src=\"http:\/\/alalloycasting.com\/wp-content\/uploads\/2021\/07\/Metal-Continuous-Casting-and-Rolling.jpg\" alt=\"Coul\u00e9e continue et laminage des m\u00e9taux\" width=\"500\" height=\"400\" srcset=\"https:\/\/www.alalloycasting.com\/wp-content\/uploads\/2021\/07\/Metal-Continuous-Casting-and-Rolling.jpg 500w, https:\/\/www.alalloycasting.com\/wp-content\/uploads\/2021\/07\/Metal-Continuous-Casting-and-Rolling-300x240.jpg 300w\" sizes=\"auto, (max-width: 500px) 100vw, 500px\" \/><\/p>\n<p>Afin de faire face au refroidissement et \u00e0 l'augmentation de la vitesse lors de la coul\u00e9e et du laminage, compte tenu de l'augmentation de l'\u00e9cartement entre les rouleaux de la buse, il est n\u00e9cessaire d'am\u00e9liorer la m\u00e9thode de r\u00e9partition du d\u00e9bit dans la buse et d'optimiser l'uniformit\u00e9 de la temp\u00e9rature et de la pression du fluide dans la cavit\u00e9 de la buse en am\u00e9liorant la r\u00e9partition des blocs d'obturation dans les embouts de la machine de coul\u00e9e. Afin de s'adapter au refroidissement et \u00e0 l'acc\u00e9l\u00e9ration de la coul\u00e9e et du laminage, l'intensit\u00e9 du refroidissement doit \u00eatre augment\u00e9e pour garantir l'\u00e9quilibre thermique en production.<\/p>\n<p>La r\u00e9duction de la temp\u00e9rature de la caisse de coul\u00e9e et du r\u00e9servoir de r\u00e9partition, ainsi que l'augmentation de la vitesse de coul\u00e9e, permettent non seulement d'am\u00e9liorer le rendement de production, mais aussi d'optimiser la fluidit\u00e9 de la masse fondue et les conditions de solidification, et d'accro\u00eetre la densit\u00e9 de la structure interne de la bobine lamin\u00e9e \u00e0 chaud.<\/p>","protected":false},"excerpt":{"rendered":"<p>The casting tips and nozzle, vacuum-formed headbox and tundish are the key factors to ensure aluminum coil casting and rolling production. After lowering the vacuum-formed&hellip;<\/p>","protected":false},"author":1,"featured_media":9492,"comment_status":"closed","ping_status":"closed","sticky":false,"template":"","format":"standard","meta":{"footnotes":""},"categories":[591],"tags":[],"class_list":["post-9491","post","type-post","status-publish","format-standard","has-post-thumbnail","hentry","category-flow-control-series"],"yoast_head":"<!-- This site is optimized with the Yoast SEO plugin v27.9 - https:\/\/yoast.com\/product\/yoast-seo-wordpress\/ -->\n<title>Headbox and Tundish for Aluminum Coil Casting and Rolling<\/title>\n<meta name=\"description\" content=\"The casting tips and nozzle, vacuum-formed headbox and tundish are the key factors to ensure aluminum coil casting and rolling production.\" \/>\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\/headbox-and-tundish\/\" 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