{"id":8248,"date":"2021-03-31T03:56:26","date_gmt":"2021-03-31T03:56:26","guid":{"rendered":"http:\/\/www.alalloycasting.com\/?p=8248"},"modified":"2021-03-31T03:56:26","modified_gmt":"2021-03-31T03:56:26","slug":"feeder-caster-tips","status":"publish","type":"post","link":"https:\/\/www.alalloycasting.com\/fr\/feeder-caster-tips\/","title":{"rendered":"Conseils pour les roulettes d'alimentation"},"content":{"rendered":"

Au cours du processus de coul\u00e9e de bandes d'aluminium, l'aluminium fondu est achemin\u00e9 depuis les embouts allong\u00e9s de la machine de coul\u00e9e vers l'espace entre deux cylindres refroidis \u00e0 l'eau et tournant en sens inverse. L'aluminium fondu est refroidi au contact des cylindres et continue de se refroidir lors de son passage entre ceux-ci, formant ainsi une large bande m\u00e9tallique coul\u00e9e d'\u00e9paisseur uniforme. Tant que le m\u00e9tal liquide est achemin\u00e9 vers la machine de coul\u00e9e, le processus de coul\u00e9e peut se d\u00e9rouler en continu.<\/p>\n

Les embouts des distributeurs sont g\u00e9n\u00e9ralement fabriqu\u00e9s dans un mat\u00e9riau c\u00e9ramique \u00e0 faible densit\u00e9 capable de r\u00e9sister \u00e0 l'abrasion et aux chocs thermiques provoqu\u00e9s par le contact avec l'aluminium liquide, comme par exemple un panneau en fibre de c\u00e9ramique<\/a> dans la forme requise.<\/p>\n

En raison de la faible densit\u00e9 de ces mat\u00e9riaux, leur conductivit\u00e9 thermique est tr\u00e8s faible (g\u00e9n\u00e9ralement inf\u00e9rieure \u00e0 0,18 W\/mK) et ils peuvent offrir un certain degr\u00e9 d'isolation thermique \u00e0 l'aluminium liquide dans le Conseil sur les roulettes<\/a>.<\/p>\n

Cependant, apr\u00e8s une certaine p\u00e9riode de production, elles peuvent subir une corrosion chimique et s'user. Cela entra\u00eenera la formation de diverses impuret\u00e9s dans la structure de la buse et conduira finalement \u00e0 un arr\u00eat pr\u00e9matur\u00e9 du mouvement de coul\u00e9e.<\/p>\n

\"Dalle<\/p>\n

Principes g\u00e9n\u00e9raux pour la d\u00e9finition des zones de coul\u00e9e et de laminage<\/p>\n

L'\u00e9paisseur de la t\u00f4le lamin\u00e9e \u00e0 chaud est augment\u00e9e, et la surface lamin\u00e9e \u00e0 chaud est r\u00e9duite.
\nLe diam\u00e8tre du rouleau de coul\u00e9e augmente, ce qui entra\u00eene une augmentation de la surface de coul\u00e9e.
\nL'\u00e9paisseur du bord de la buse de coul\u00e9e augmente et la surface de laminage de la coul\u00e9e s'\u00e9tend.
\nLa force de laminage de l'\u00e9quipement est importante, et la surface de coul\u00e9e et de laminage est agrandie.
\nLa zone de laminage \u00e0 chaud de l'aluminium pur et des alliages tendres est l\u00e9g\u00e8rement plus longue, tandis que celle des alliages durs est l\u00e9g\u00e8rement plus courte.
\nLa vitesse de laminage \u00e0 chaud d\u00e9signe la vitesse de la t\u00f4le lamin\u00e9e \u00e0 chaud. Par rapport \u00e0 la vitesse lin\u00e9aire du cylindre de coul\u00e9e, la vitesse de laminage \u00e0 chaud pr\u00e9sente un certain glissement vers l'avant. Plus le diam\u00e8tre est diff\u00e9rent, plus le glissement vers l'avant est important. Ce glissement vers l'avant est g\u00e9n\u00e9ralement compris entre 6 et 10%.<\/p>\n

La vitesse de coul\u00e9e est d\u00e9termin\u00e9e par la cavit\u00e9 de m\u00e9tal liquide. Lorsque la vitesse de laminage de la coul\u00e9e atteint une certaine valeur critique, le front de cristallisation se d\u00e9place vers le plan de sortie du cylindre de coul\u00e9e. En raison du retard de refroidissement, la cavit\u00e9 de m\u00e9tal liquide s'approfondit jusqu'\u00e0 ce que le m\u00e9tal ne puisse plus se solidifier \u00e0 temps et que le m\u00e9tal liquide s'\u00e9coule hors du cylindre. Les coulures s'\u00e9coulent et perturbent le laminage normal.<\/p>\n

Il existe donc une vitesse limite pour la vitesse de laminage lors de la coul\u00e9e, c'est-\u00e0-dire la vitesse maximale permettant un laminage stable dans la cavit\u00e9 liquide critique.<\/p>","protected":false},"excerpt":{"rendered":"

During the aluminum strip casting process, molten aluminum is fed from the elongated feeder caster tips into the nip between two counter-rotating water-cooled rolls. 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