{"id":5926,"date":"2020-10-24T14:17:08","date_gmt":"2020-10-24T14:17:08","guid":{"rendered":"http:\/\/www.alalloycasting.com\/?p=5926"},"modified":"2020-10-24T14:17:08","modified_gmt":"2020-10-24T14:17:08","slug":"cast-rolled-sheet","status":"publish","type":"post","link":"https:\/\/www.alalloycasting.com\/fr\/cast-rolled-sheet\/","title":{"rendered":"T\u00f4le lamin\u00e9e par coul\u00e9e"},"content":{"rendered":"

Lorsque l'\u00e9paisseur de la t\u00f4le coul\u00e9e-lamin\u00e9e est plus importante, en raison d'une certaine diff\u00e9rence de temp\u00e9rature entre les faces sup\u00e9rieure et inf\u00e9rieure de la masse fondue dans la zone de coul\u00e9e-laminage, la temp\u00e9rature de la face sup\u00e9rieure est l\u00e9g\u00e8rement sup\u00e9rieure \u00e0 celle de la face inf\u00e9rieure, ce qui d\u00e9place l'axe central de la structure cristalline et entra\u00eene une asym\u00e9trie entre les structures sup\u00e9rieure et inf\u00e9rieure. Afin de garantir la sym\u00e9trie des structures sup\u00e9rieure et inf\u00e9rieure, l\u2019organisation du post-traitement et les performances du proc\u00e9d\u00e9 de fabrication de la t\u00f4le coul\u00e9e-lamin\u00e9e sont am\u00e9lior\u00e9es, et le ventilateur de la buse sup\u00e9rieure est r\u00e9tract\u00e9 d\u2019une certaine distance lors de l\u2019assemblage de la\u00a0embouts et buses de coul\u00e9e<\/a>. Sa taille d\u00e9pend de l'\u00e9paisseur de la t\u00f4le lamin\u00e9e \u00e0 chaud.<\/p>\n

\"T\u00f4le<\/p>\n

L'extr\u00e9mit\u00e9 avant de l'oreille est inclin\u00e9e de mani\u00e8re appropri\u00e9e vers l'ext\u00e9rieur par rapport aux deux extr\u00e9mit\u00e9s de la buse de coul\u00e9e, et forme un certain angle avec celles-ci, ce qui facilite l'extraction de la t\u00f4le coul\u00e9e-lamin\u00e9e de la buse. La valeur de cet angle varie en fonction des exigences de la coul\u00e9e et du laminage ; elle est g\u00e9n\u00e9ralement de 15\u00b0, 30\u00b0 ou 45\u00b0. L\u2019utilisation d\u2019oreilles \u00e0 45\u00b0 permet de r\u00e9duire, voire d\u2019\u00e9liminer, le ph\u00e9nom\u00e8ne de fissuration des bords des t\u00f4les coul\u00e9es-lamin\u00e9es, en particulier celles en aluminium pur, ainsi que de r\u00e9duire la quantit\u00e9 de rognage lors des passes de laminage \u00e0 froid suivantes et d\u2019am\u00e9liorer le rendement ; cependant, les bandes coul\u00e9es-lamin\u00e9es ont tendance \u00e0 s\u2019\u00e9largir facilement vers les deux c\u00f4t\u00e9s et au niveau des bords. Comme l\u2019\u00e9paisseur est faible, la largeur de la bande augmente, ce qui provoque son enroulement, en particulier lorsque le niveau de liquide du r\u00e9servoir avant est ajust\u00e9 ou qu\u2019il fluctue. Lors de la production d\u2019alliages pr\u00e9sentant un intervalle cristallin relativement important, comme le 5052, des fissures diagonales peuvent parfois appara\u00eetre au niveau des bords. L\u2019utilisation de rebords \u00e0 15\u00b0 permet d\u2019\u00e9viter les d\u00e9fauts susmentionn\u00e9s, mais favorise l\u2019apparition de fissures sur les bords. Ces fissures n\u2019affectent pas les performances du processus, mais peuvent r\u00e9duire le rendement. Il convient d\u2019utiliser des rebords \u00e0 30\u00b0, qui constituent un compromis entre les deux options pr\u00e9c\u00e9dentes.<\/p>","protected":false},"excerpt":{"rendered":"

When the thickness of the cast-rolled sheet is thicker, due to the certain temperature difference between the upper and lower surfaces of the melt in…<\/p>","protected":false},"author":1,"featured_media":5970,"comment_status":"closed","ping_status":"closed","sticky":false,"template":"","format":"standard","meta":{"footnotes":""},"categories":[233],"tags":[],"class_list":["post-5926","post","type-post","status-publish","format-standard","has-post-thumbnail","hentry","category-blog"],"yoast_head":"\nCast Rolled Sheet Processing Process by Casting Tips and Nozzle<\/title>\n<meta name=\"description\" content=\"When the thickness of the cast rolled sheet is thicker, due to the certain temperature difference between the upper and lower surfaces...\" \/>\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\/cast-rolled-sheet\/\" \/>\n<meta property=\"og:locale\" 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