bo\u00eete avant<\/a> (chambre d'alimentation) atteint une certaine valeur, le temps n\u00e9cessaire au m\u00e9tal pour s'\u00e9couler hors de la buse d'alimentation est \u00e0 peu pr\u00e8s le m\u00eame, la masse fondue est r\u00e9partie uniform\u00e9ment \u00e0 sa sortie de la cavit\u00e9 de la buse, et les champs d'\u00e9coulement, de temp\u00e9rature et de pression au niveau du bord avant de la buse de coul\u00e9e sont r\u00e9partis de mani\u00e8re raisonnable.<\/p>\nUne fois la production termin\u00e9e, l'int\u00e9rieur de la cavit\u00e9 de coul\u00e9e est vid\u00e9 et inspect\u00e9 : le m\u00e9tal recouvre uniform\u00e9ment la cavit\u00e9 de coul\u00e9e et aucun ph\u00e9nom\u00e8ne de scories n'y est observ\u00e9. La face d'extr\u00e9mit\u00e9 de la bobine coul\u00e9e-lamin\u00e9e est de bonne qualit\u00e9 : elle ne pr\u00e9sente ni forme en tour, ni stratification, ni fissures importantes sur les bords.<\/p>\n
En raison du refroidissement et de l'acc\u00e9l\u00e9ration de la coul\u00e9e et du laminage, le d\u00e9bit d'aluminium fondu dans la buse de coul\u00e9e par unit\u00e9 de temps est in\u00e9vitablement accru. Dans des conditions normales, le niveau de liquide dans le r\u00e9servoir avant doit \u00eatre augment\u00e9 pour garantir l'alimentation en liquide. Cependant, comme il existe un certain \u00e9cart entre la buse de coul\u00e9e et le rouleau, c\u2019est la tension superficielle de l\u2019aluminium fondu au niveau de cet \u00e9cart qui emp\u00eache le m\u00e9tal de s\u2019infiltrer entre la buse et le rouleau, permettant ainsi la r\u00e9alisation de la coul\u00e9e. Dans certaines conditions, la tension superficielle de l\u2019aluminium fondu est constante. Par cons\u00e9quent, la pression de l\u2019aluminium fondu au niveau de cet espace est limit\u00e9e.<\/p>\n
En effet, plus l'\u00e9cart entre les rouleaux de la buse augmente, plus la pression diminue. Lors de l'essai, afin d'am\u00e9liorer la qualit\u00e9 de surface de la bande coul\u00e9e-lamin\u00e9e, l'\u00e9cart entre les rouleaux de la buse a \u00e9t\u00e9 augment\u00e9 d'environ 100 \u03bcm. Par cons\u00e9quent, le simple fait d\u2019augmenter le niveau de liquide pour garantir un \u00e9coulement complet de la masse fondue rendra l\u2019\u00e9cart entre les rouleaux de la buse incapable de r\u00e9sister \u00e0 la pression de l\u2019aluminium fondu, ce qui provoquera une oxydation et un plissement au niveau le plus faible, et un retour \u00e0 l\u2019\u00e9tat d\u2019aluminium au niveau le plus \u00e9lev\u00e9, ce qui n\u2019est pas souhaitable.<\/p>","protected":false},"excerpt":{"rendered":"
The vertical slab stage is the prerequisite for the aluminum sheet normal production of casting and rolling. From the vertical slab, the influence of the…<\/p>","protected":false},"author":1,"featured_media":9528,"comment_status":"closed","ping_status":"closed","sticky":false,"template":"","format":"standard","meta":{"footnotes":""},"categories":[233],"tags":[],"class_list":["post-9527","post","type-post","status-publish","format-standard","has-post-thumbnail","hentry","category-blog"],"yoast_head":"\n
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