{"id":9479,"date":"2021-07-07T09:08:43","date_gmt":"2021-07-07T09:08:43","guid":{"rendered":"http:\/\/www.alalloycasting.com\/?p=9479"},"modified":"2021-07-07T09:08:43","modified_gmt":"2021-07-07T09:08:43","slug":"ingot-hot-top-casting","status":"publish","type":"post","link":"https:\/\/www.alalloycasting.com\/fr\/ingot-hot-top-casting\/","title":{"rendered":"Coul\u00e9e \u00e0 chaud de lingots"},"content":{"rendered":"

Le lingot d'aluminium obtenu par coul\u00e9e \u00e0 t\u00eate chaude pr\u00e9sente une structure homog\u00e8ne et de bonnes propri\u00e9t\u00e9s m\u00e9caniques. Afin d'obtenir une telle structure de coul\u00e9e, on utilise la coul\u00e9e \u00e0 t\u00eate chaude pour la fabrication de lingots ronds.<\/p>\n

La qualit\u00e9 des lingots d'alliage d'aluminium a une incidence importante sur les \u00e9tapes de transformation ult\u00e9rieures et sur la qualit\u00e9 des produits en aluminium. Les d\u00e9fauts courants des lingots comprennent les fissures, les pores, la porosit\u00e9, les inclusions de scories, la s\u00e9gr\u00e9gation, la s\u00e9paration \u00e0 froid, etc. Ces d\u00e9fauts peuvent avoir de nombreuses causes dans la production r\u00e9elle, notamment la structure du moule de coul\u00e9e et les propri\u00e9t\u00e9s de l'alliage, le degr\u00e9 de purification de la masse fondue et d'affinage du grain, ainsi que les param\u00e8tres du proc\u00e9d\u00e9 de coul\u00e9e, etc.<\/p>\n

La qualit\u00e9 d'un lingot comprend \u00e0 la fois sa structure et l'\u00e9tat de sa surface. Il est d\u00e9sormais admis que la structure \u00e0 grains fins et homog\u00e8ne sur toute la section du lingot constitue la meilleure structure possible pour ce dernier. Afin d'obtenir ce type de structure de coul\u00e9e, la coul\u00e9e de lingots ronds recourt \u00e0 la technique de coul\u00e9e \u00e0 t\u00eate chaude.<\/p>\n

\"\"<\/p>\n

Avantages de la coul\u00e9e \u00e0 chaud de lingots<\/p>\n

(1) Le lingot obtenu par coul\u00e9e \u00e0 t\u00eate chaude pr\u00e9sente une structure homog\u00e8ne et de bonnes propri\u00e9t\u00e9s m\u00e9caniques. Cela s'explique par le fait que la hauteur de cristallisation effective du moule \u00e0 t\u00eate chaude est tr\u00e8s faible, ce qui augmente la vitesse de refroidissement du lingot, r\u00e9duit la profondeur de la cavit\u00e9 de liquide du lingot et r\u00e9tr\u00e9cit la zone de transition, am\u00e9liorant ainsi la compacit\u00e9 du lingot.<\/p>\n

(2) La coul\u00e9e \u00e0 \u00ab hot top \u00bb permet de se passer de l'entonnoir et d'obtenir un \u00e9coulement lat\u00e9ral. Le niveau du m\u00e9tal en fusion dans le \u00ab hot top \u00bb et canal de distribution<\/a> est maintenu \u00e0 un niveau constant, ce qui permet d'obtenir une coul\u00e9e stable dans un moule court et une coul\u00e9e homog\u00e8ne. Le film d'oxyde \u00e0 la surface du liquide dans le cristallisoir est stable et ne provoque pas d'agitation, ce qui emp\u00eache efficacement la pollution secondaire de la masse fondue et am\u00e9liore la puret\u00e9 du m\u00e9tal.<\/p>\n

(3) La surface du lingot est lisse, et le degr\u00e9 ainsi que la profondeur de la s\u00e9gr\u00e9gation inverse autour du lingot sont consid\u00e9rablement r\u00e9duits. En effet, dans la coul\u00e9e \u00e0 t\u00eate chaude, l\u2019effet de refroidissement \u00e0 contre-courant de l\u2019eau de refroidissement secondaire est relativement suffisant, ce qui emp\u00eache efficacement la refusion secondaire du condensat, inhibant ainsi la formation de nodules de s\u00e9gr\u00e9gation. Parall\u00e8lement, pendant le processus de coul\u00e9e, la t\u00eate du lingot maintient en permanence une colonne de liquide stable, ce qui r\u00e9duit la position de solidification de la masse fondue dans le moule, emp\u00eache efficacement le refroidissement pr\u00e9matur\u00e9 du niveau du m\u00e9tal en fusion et stabilise le m\u00e9nisque, ce qui permet d\u2019emp\u00eacher efficacement la formation de barri\u00e8res froides.<\/p>","protected":false},"excerpt":{"rendered":"

The aluminum ingot produced by hot top casting has uniform structure and good mechanical properties. In order to obtain such a casting structure, aluminum ingot…<\/p>","protected":false},"author":1,"featured_media":9480,"comment_status":"closed","ping_status":"closed","sticky":false,"template":"","format":"standard","meta":{"footnotes":""},"categories":[233],"tags":[],"class_list":["post-9479","post","type-post","status-publish","format-standard","has-post-thumbnail","hentry","category-blog"],"yoast_head":"\nIngot Hot Top Casting, Aluminum Round Ingot Casting<\/title>\n<meta name=\"description\" content=\"The aluminum ingot produced by hot top casting has a uniform structure and good mechanical properties. 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