{"id":10199,"date":"2021-09-07T10:03:27","date_gmt":"2021-09-07T10:03:27","guid":{"rendered":"http:\/\/www.alalloycasting.com\/?p=10199"},"modified":"2021-09-10T03:19:58","modified_gmt":"2021-09-10T03:19:58","slug":"head-box","status":"publish","type":"post","link":"https:\/\/www.alalloycasting.com\/fr\/head-box\/","title":{"rendered":"Bo\u00eete d'alimentation"},"content":{"rendered":"<p>L'aluminium fondu p\u00e9n\u00e8tre dans la caisse de t\u00eate depuis le caisson de filtration CFF par la goulotte d'\u00e9coulement. Il existe g\u00e9n\u00e9ralement deux fa\u00e7ons d'entrer dans la caisse de t\u00eate :<\/p>\n<p>1) Le fond de la goulotte est plus haut que le haut du bac avant, et l'aluminium fondu est inject\u00e9 par le haut de ce dernier. Dans ce cas, si le niveau de liquide du bac avant est maintenu stable, celui-ci ne fluctuera pas \u00e0 la hausse ni \u00e0 la baisse.<\/p>\n<p>2) Le fond de la goulotte d'\u00e9coulement est situ\u00e9 plus bas que le haut du bo\u00eetier avant, et le liquide est inject\u00e9 par le milieu et le haut de ce dernier.<\/p>\n<p>En raison de l'\u00e9cart important entre le niveau de liquide du <a href=\"http:\/\/www.alalloycasting.com\/fr\/casting-launder-2\/\">canal de coul\u00e9e<\/a> et l'entr\u00e9e de l'aluminium fondu ; cette entr\u00e9e sert g\u00e9n\u00e9ralement \u00e0 r\u00e9guler le d\u00e9bit du liquide \u00e0 l'aide de fibre c\u00e9ramique <a href=\"http:\/\/www.alalloycasting.com\/fr\/refractory-fiber-cone\/\">retirer les c\u00f4nes<\/a>.<\/p>\n<p>Lorsque le bouchon en fibre c\u00e9ramique se trouve pr\u00e8s de la partie inf\u00e9rieure de l\u2019orifice, l\u2019aluminium fondu est inject\u00e9 par l\u2019interstice situ\u00e9 entre la partie sup\u00e9rieure de l\u2019orifice et le bouchon en fibre c\u00e9ramique, ce qui provoque souvent la formation d\u2019ondulations \u00e0 la surface du liquide, entra\u00eenant une fluctuation du niveau de liquide, qui \u00e0 son tour fait fluctuer le m\u00e9nisque au niveau de l\u2019interstice de la buse de laminage. En cons\u00e9quence, des ondulations apparaissent \u00e0 la surface de la bande coul\u00e9e-lamin\u00e9e. Si le c\u00f4ne se trouve pr\u00e8s de la partie sup\u00e9rieure de l\u2019orifice, l\u2019aluminium fondu est inject\u00e9 par l\u2019interstice situ\u00e9 entre la partie inf\u00e9rieure de l\u2019orifice et le c\u00f4ne de coul\u00e9e. \u00c0 ce moment-l\u00e0, le niveau du liquide dans le r\u00e9servoir avant est globalement stable, mais des fluctuations persistent sous la surface apparemment stable.<\/p>\n<p>Cette onde est diffract\u00e9e au niveau de l'orifice de sortie et se propage dans l'interstice entre le rouleau de la buse, ce qui provoque des fluctuations du m\u00e9nisque et entra\u00eene la formation de vagues \u00e0 la surface de la bande. Afin de r\u00e9duire ou d\u2019\u00e9liminer ce type d\u2019ondulations, il est n\u00e9cessaire d\u2019emp\u00eacher que les fluctuations caus\u00e9es par l\u2019injection irr\u00e9guli\u00e8re d\u2019aluminium fondu \u00e0 l\u2019entr\u00e9e ne se propagent vers l\u2019avant de la pi\u00e8ce moul\u00e9e et ne se r\u00e9percutent sur le laminage. Par cons\u00e9quent, un filtre vertical peut \u00eatre ins\u00e9r\u00e9 entre l\u2019entr\u00e9e et la sortie du ch\u00e2ssis avant afin d\u2019emp\u00eacher la propagation et la diffraction des ondes, ce qui permet de r\u00e9duire ou d\u2019\u00e9liminer les ondulations de l\u2019eau. Si l\u2019on augmente de mani\u00e8re appropri\u00e9e la surface de contact entre le liquide et le filtre jusqu\u2019\u00e0 la sortie, l\u2019effet sera plus marqu\u00e9.<\/p>\n<p>Par ailleurs, d\u2019autres mesures peuvent \u00e9galement \u00eatre prises au cours du processus, telles que la r\u00e9duction ou l\u2019\u00e9limination, dans la mesure du possible, de l\u2019\u00e9cart entre les rouleaux de la buse afin de r\u00e9duire ou d\u2019\u00e9liminer les ondulations caus\u00e9es par l\u2019eau. Cependant, lorsque l\u2019\u00e9cart entre les rouleaux de la buse est r\u00e9duit jusqu\u2019\u00e0 un certain point, des d\u00e9fauts tels que des marques de rouleaux et une s\u00e9gr\u00e9gation superficielle peuvent appara\u00eetre \u00e0 la surface de la bande. On peut alors diminuer la temp\u00e9rature de coul\u00e9e ou la vitesse de coul\u00e9e, augmenter la tension superficielle du film d\u2019oxyde d\u2019aluminium sur le m\u00e9nisque au niveau de l\u2019\u00e9cart entre les rouleaux de la buse, augmenter le rayon de courbure du m\u00e9nisque, r\u00e9duire les fluctuations du m\u00e9nisque, et ainsi r\u00e9duire ou \u00e9liminer les ondulations de l\u2019eau. Mais cela r\u00e9duira consid\u00e9rablement le rendement de production et risque en m\u00eame temps d\u2019endommager facilement la buse.<\/p>","protected":false},"excerpt":{"rendered":"<p>The molten aluminum enters the head box from the CFF filter box through the flow trough. There are generally two ways to enter the head&hellip;<\/p>","protected":false},"author":1,"featured_media":10200,"comment_status":"closed","ping_status":"closed","sticky":false,"template":"","format":"standard","meta":{"footnotes":""},"categories":[233],"tags":[],"class_list":["post-10199","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>Head Box of Molten Aluminum Control Device, Casting Nozzle<\/title>\n<meta name=\"description\" content=\"The molten aluminum enters the head box from the CFF filter box through the flow trough. 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