{"id":11688,"date":"2021-12-09T02:09:33","date_gmt":"2021-12-09T02:09:33","guid":{"rendered":"http:\/\/www.alalloycasting.com\/?p=11688"},"modified":"2021-12-09T02:09:33","modified_gmt":"2021-12-09T02:09:33","slug":"cast-rolling-nozzles","status":"publish","type":"post","link":"https:\/\/www.alalloycasting.com\/fr\/cast-rolling-nozzles\/","title":{"rendered":"Buses de laminage par coul\u00e9e"},"content":{"rendered":"

Les buses de laminage moul\u00e9es sont calcin\u00e9es \u00e0 haute temp\u00e9rature et ne contiennent aucune mati\u00e8re organique. Leur taux de retrait \u00e0 800 \u00b0C est nul, ce qui permet de les utiliser dans diverses machines de coul\u00e9e continue \u00e0 double cylindre. Les buses de coul\u00e9e souples en fibre c\u00e9ramique sans scories sont utilis\u00e9es pour la production de plaques et de feuilles d\u2019aluminium destin\u00e9es aux mat\u00e9riaux d\u2019emballage pharmaceutiques et alimentaires. La buse de coul\u00e9e dure, fabriqu\u00e9e \u00e0 partir de fibres c\u00e9ramiques et d\u2019une charge import\u00e9e, se caract\u00e9rise par une r\u00e9sistance \u00e9lev\u00e9e, une surface lisse et une bonne r\u00e9sistance \u00e0 l\u2019usure. Elle est adapt\u00e9e \u00e0 la coul\u00e9e et au laminage de t\u00f4les d\u2019aluminium \u00e0 grande vitesse.<\/p>\n

Le buse de coul\u00e9e<\/a>\u00a0Il est fabriqu\u00e9 \u00e0 partir de mat\u00e9riaux de haute qualit\u00e9 (sans silicate de sodium) et pr\u00e9sente les caract\u00e9ristiques suivantes : aluminium antiadh\u00e9sif, faible conductivit\u00e9 thermique, bonne stabilit\u00e9 \u00e0 haute temp\u00e9rature, densit\u00e9 homog\u00e8ne, surface lisse et dimensions pr\u00e9cises.<\/p>\n

Les protub\u00e9rances en forme de bandes qui apparaissent sur toute la longueur de la surface du produit en aluminium constituent des d\u00e9fauts de surface de ce dernier. Lorsqu\u2019elles se trouvent sur un seul c\u00f4t\u00e9 du produit, on parle d\u2019\u00ab oreilles \u00bb unilat\u00e9rales ; lorsqu\u2019elles sont pr\u00e9sentes des deux c\u00f4t\u00e9s, on parle d\u2019\u00ab oreilles \u00bb bilat\u00e9rales. Certaines s'\u00e9tendent sur toute la longueur du produit, mais il en existe \u00e9galement qui sont partielles, intermittentes ou p\u00e9riodiques. Les bavures qui apparaissent \u00e0 la surface du produit doivent \u00eatre \u00e9limin\u00e9es par meulage.<\/p>\n

\"\"<\/p>\n

Les buses de laminage moul\u00e9es ont fissur\u00e9 les oreilles car, pendant le processus de laminage, le trou fini est surrempli de m\u00e9tal et l'exc\u00e9dent de m\u00e9tal est refoul\u00e9 dans l'interstice entre les cylindres. Les raisons pr\u00e9cises sont les suivantes :<\/p>\n

(1) Une conception inad\u00e9quate des passes, un r\u00e9glage incorrect du laminoir ou une usure importante du trou fini, entra\u00eenant un nombre \u00e9lev\u00e9 de trous finis et de bavures des deux c\u00f4t\u00e9s ;
\n(2) Le rail de guidage d'entr\u00e9e du trou fini est mal install\u00e9, n'est pas bien serr\u00e9, le jeu est trop important, ou le type de trou d'entr\u00e9e est de nature \u00e0 provoquer des bavures unilat\u00e9rales ou des cassures bilat\u00e9rales ;
\n(3) La temp\u00e9rature de la pi\u00e8ce lamin\u00e9e est faible ou la diff\u00e9rence de temp\u00e9rature sur toute sa longueur est importante ;
\n(4) Mauvais r\u00e9glage du laminoir continu.
\n(5) Lors de la d\u00e9coupe du m\u00e9tal au niveau du trou avant du produit fini, des coques convexes apparaissent \u00e0 la surface de la pi\u00e8ce lamin\u00e9e, et des bavures p\u00e9riodiques se forment pendant le laminage.<\/p>\n

Les m\u00e9thodes de pr\u00e9vention et d'\u00e9radication sont les suivantes :<\/p>\n

(1) Choisir un facteur de largeur appropri\u00e9 et optimiser la conception du trou ;
\n(2) Renforcer le r\u00e9glage du laminoir et r\u00e9partir de mani\u00e8re raisonnable le taux de r\u00e9duction ;
\n(3) Installez correctement le rail d'entr\u00e9e du trou fini ;
\n(4) Remplacer les rainures d'usure fortement ab\u00eem\u00e9es ;
\n(5) Am\u00e9liorer la qualit\u00e9 du chauffage de la billette afin d'obtenir une temp\u00e9rature homog\u00e8ne.<\/p>","protected":false},"excerpt":{"rendered":"

Cast rolling nozzles are calcined at high temperatures and do not contain organic matter. The shrinkage rate at 800\u00b0C is zero, and it can be…<\/p>","protected":false},"author":1,"featured_media":11690,"comment_status":"closed","ping_status":"closed","sticky":false,"template":"","format":"standard","meta":{"footnotes":""},"categories":[233],"tags":[],"class_list":["post-11688","post","type-post","status-publish","format-standard","has-post-thumbnail","hentry","category-blog"],"yoast_head":"\nCast Rolling Nozzles for Molten Aluminum -sales@alalloycasting.com<\/title>\n<meta name=\"description\" content=\"Cast-rolling nozzles are calcined at high temperatures and do not contain organic matter. 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