{"id":6122,"date":"2020-10-29T09:14:56","date_gmt":"2020-10-29T09:14:56","guid":{"rendered":"http:\/\/www.alalloycasting.com\/?p=6122"},"modified":"2020-10-29T09:17:19","modified_gmt":"2020-10-29T09:17:19","slug":"front-box","status":"publish","type":"post","link":"https:\/\/www.alalloycasting.com\/fr\/front-box\/","title":{"rendered":"Bo\u00eete avant"},"content":{"rendered":"<p>La cuve avant est en r\u00e9alit\u00e9 un r\u00e9partiteur. Elle se compose de deux r\u00e9cipients reli\u00e9s entre eux. L'enveloppe ext\u00e9rieure est constitu\u00e9e de plaques d'acier soud\u00e9es, tandis que le rev\u00eatement int\u00e9rieur est constitu\u00e9 de mat\u00e9riaux r\u00e9fractaires tels que l'argile de silicate d'aluminium ou la laine d'amiante. Au cours du processus de coul\u00e9e-laminage, le m\u00e9tal en fusion y est stock\u00e9 et un certain niveau de liquide est maintenu afin d\u2019alimenter en continu la zone de coul\u00e9e-laminage en aluminium en fusion. Sa fonction principale est de contr\u00f4ler la pression de l\u2019aluminium en fusion s\u2019\u00e9coulant depuis le <a href=\"http:\/\/www.alalloycasting.com\/fr\/casting-tip-and-nozzle\/\">buse d'alimentation<\/a> dans l'interstice des cylindres de coul\u00e9e, c'est-\u00e0-dire la masse fondue dans le<a href=\"http:\/\/www.alalloycasting.com\/fr\/alumina-fiber-flow-box\/\"> bo\u00eetier de r\u00e9gulation de d\u00e9bit<\/a> doit \u00eatre maintenu \u00e0 un niveau relativement stable. En fonction du type de m\u00e9tal, de l'\u00e9paisseur de la bande, de la temp\u00e9rature de coul\u00e9e et de la vitesse de coul\u00e9e, le niveau de liquide dans le r\u00e9partiteur doit \u00eatre maintenu \u00e0 diff\u00e9rentes hauteurs.<\/p>\n<p>\u00c0 l'heure actuelle, le contr\u00f4le du niveau de liquide dans le r\u00e9partiteur repose principalement sur un syst\u00e8me \u00e0 deux niveaux : le niveau de l'aluminium liquide est r\u00e9gul\u00e9 par le dispositif de contr\u00f4le de niveau \u00e0 orifice et par le dispositif de contr\u00f4le de niveau du r\u00e9partiteur, ce qui garantit efficacement la pr\u00e9cision de contr\u00f4le du niveau de liquide dans la chambre avant (\u00b11 m). Une bou\u00e9e \u00e0 guidage vertical est r\u00e9gl\u00e9e manuellement pour atteindre une position pr\u00e9cise. La position en hauteur de la bou\u00e9e est d\u00e9tect\u00e9e sous forme d\u2019impulsions, et les r\u00e9sultats de cette d\u00e9tection sont transmis au syst\u00e8me de r\u00e9gulation de niveau de l\u2019orifice. Le d\u00e9placement de la tige de commande permettant de r\u00e9gler l\u2019orifice peut \u00eatre effectu\u00e9 par un actionneur \u00e9lectrique afin d\u2019atteindre les objectifs de r\u00e9gulation du niveau de l\u2019orifice. Le bac avant est \u00e9quip\u00e9 d\u2019un dispositif de r\u00e9gulation du niveau de liquide du bac avant et d\u2019un dispositif d\u2019alarme de niveau de liquide. Il permet d\u2019assurer la r\u00e9gulation automatique du niveau de liquide du bac avant, l\u2019affichage automatique du niveau de liquide r\u00e9el et le d\u00e9clenchement d\u2019une alarme en cas de niveau de liquide trop \u00e9lev\u00e9.<\/p>\n<p><img loading=\"lazy\" decoding=\"async\" class=\"alignnone size-full wp-image-6124\" src=\"http:\/\/alalloycasting.com\/wp-content\/uploads\/2020\/10\/Front-Box-1.jpg\" alt=\"Bo\u00eete avant\" width=\"500\" height=\"400\" srcset=\"https:\/\/www.alalloycasting.com\/wp-content\/uploads\/2020\/10\/Front-Box-1.jpg 500w, https:\/\/www.alalloycasting.com\/wp-content\/uploads\/2020\/10\/Front-Box-1-300x240.jpg 300w\" sizes=\"auto, (max-width: 500px) 100vw, 500px\" \/><\/p>\n<p>Lorsque le niveau de liquide dans le r\u00e9partiteur est en \u00e9quilibre, la pression hydrostatique de la colonne de liquide dans la chambre avant est \u00e9quivalente \u00e0 la pression suppl\u00e9mentaire exerc\u00e9e par le film d'oxyde sur l'aluminium en fusion. La hauteur de la bo\u00eete avant et le rayon du film d'oxyde entre les rouleaux de la buse sont parfaitement adapt\u00e9s, et le processus de coul\u00e9e et de laminage maintient un \u00e9quilibre dynamique, ce qui permet de poursuivre la coul\u00e9e et le laminage.<\/p>\n<p>Lorsque le niveau de liquide dans le r\u00e9partiteur est bas, le rayon de la couche d'oxyde entre les rouleaux de la buse augmente, la couche d'oxyde s'\u00e9tire, et celle-ci est moins soumise \u00e0 des contraintes et moins susceptible d'\u00eatre endommag\u00e9e. Dans ces conditions, la qualit\u00e9 de surface de la t\u00f4le est meilleure. Cependant, lorsque le niveau d'aluminium liquide est trop bas, la surface de la t\u00f4le est sujette \u00e0 des d\u00e9fauts de vides dus \u00e0 un apport insuffisant de m\u00e9tal.<\/p>\n<p>Lorsque le niveau de liquide dans le r\u00e9partiteur est \u00e9lev\u00e9, la hauteur de pression statique de la masse fondue est \u00e9lev\u00e9e, c'est-\u00e0-dire que plus la pression statique est \u00e9lev\u00e9e, plus le rayon du film d\u2019oxyde du m\u00e9tal en fusion est petit et plus ce film est mince ; lorsque le rayon du film d\u2019oxyde du m\u00e9tal en fusion est inf\u00e9rieur \u00e0 une certaine valeur, le film d\u2019oxyde est endommag\u00e9, la surface de la brame pr\u00e9sente une oxydation et des plis dans les cas les moins graves, et le laminage \u00e0 chaud est interrompu dans les cas les plus graves.<\/p>","protected":false},"excerpt":{"rendered":"<p>The front box is actually a tundish. It consists of two connected containers. The outer shell is welded by steel plates and the inner lining,&hellip;<\/p>","protected":false},"author":1,"featured_media":6123,"comment_status":"open","ping_status":"closed","sticky":false,"template":"","format":"standard","meta":{"footnotes":""},"categories":[138],"tags":[6086,6076,4345,6080,6070,6081,6071,6085,6075,6089,6078,6068,6067,6083,6073,6082,6072,6084,6074,6088,6077,6087,6069,6090,6079],"class_list":["post-6122","post","type-post","status-publish","format-standard","has-post-thumbnail","hentry","category-seo","tag-al-si-fiber-flow-box","tag-al-si-fiber-flow-controller","tag-alumina-ceramic","tag-alumina-ceramic-flow-box","tag-alumina-ceramic-flow-controller","tag-aluminium-silicate-flow-box","tag-aluminium-silicate-flow-controller","tag-aluminum-silicate-fiber-flow-box","tag-aluminum-silicate-fiber-flow-controller","tag-ceramic-fiber-flow-box","tag-ceramic-fiber-flow-controller","tag-flow-container","tag-head-box-and-tundish","tag-high-alumina-ceramic-flow-box","tag-high-alumina-ceramic-flow-controller","tag-high-alumina-fiber-flow-box","tag-high-alumina-fiber-flow-controller","tag-high-alumina-flow-box","tag-high-alumina-flow-controller","tag-high-silica-glass-flow-box","tag-high-silica-glass-flow-controller","tag-molten-aluminum-flow-box","tag-molten-aluminum-flow-controller","tag-non-stick-aluminum-flow-box","tag-non-stick-aluminum-flow-controller"],"yoast_head":"<!-- This site is optimized with the Yoast SEO plugin v27.9 - https:\/\/yoast.com\/product\/yoast-seo-wordpress\/ -->\n<title>Front Box | Tundish for Molten Metal Level Control System<\/title>\n<meta name=\"description\" content=\"The front box is actually a tundish. 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