{"id":6150,"date":"2020-11-03T06:44:46","date_gmt":"2020-11-03T06:44:46","guid":{"rendered":"http:\/\/www.alalloycasting.com\/?p=6150"},"modified":"2020-11-03T06:47:45","modified_gmt":"2020-11-03T06:47:45","slug":"hot-top-method","status":"publish","type":"post","link":"https:\/\/www.alalloycasting.com\/fr\/hot-top-method\/","title":{"rendered":"M\u00e9thode \u00ab Hot Top \u00bb"},"content":{"rendered":"<p>La m\u00e9thode \u201c hot top \u201d utilise le m\u00eame niveau de coul\u00e9e pour r\u00e9duire les points de chute de la plaque de distribution. Parall\u00e8lement, la surface expos\u00e9e de la partie sup\u00e9rieure du moule est r\u00e9duite et un \u00ab capuchon chaud \u00bb assure la conservation de la chaleur ; la temp\u00e9rature de coul\u00e9e est donc l\u00e9g\u00e8rement inf\u00e9rieure \u00e0 celle de la m\u00e9thode classique. Cependant, si la temp\u00e9rature de coul\u00e9e est trop basse, cela favorise la formation d\u2019une barri\u00e8re froide et augmente sa profondeur. Si la temp\u00e9rature de coul\u00e9e est trop \u00e9lev\u00e9e, cela peut facilement entra\u00eener l\u2019apparition d\u2019une structure en dentelle dans le lingot. Elle doit donc \u00eatre correctement contr\u00f4l\u00e9e.<\/p>\n<p>Comme nous le savons tous, le niveau du m\u00e9tal en fusion dans la cavit\u00e9 du moule constitue un crit\u00e8re essentiel pour \u00e9valuer la qualit\u00e9 de la coul\u00e9e de lingots ronds. Dans le proc\u00e9d\u00e9 classique de coul\u00e9e en moule m\u00e9tallique, le niveau de liquide dans la cavit\u00e9 du moule est compris entre 50 et 80 mm environ. Lorsque le m\u00e9tal en fusion traverse le cristallisoir, la premi\u00e8re couche solidifi\u00e9e se r\u00e9tracte et se d\u00e9tache de la surface de travail du cristallisoir, cr\u00e9ant ainsi un espace qui entrave consid\u00e9rablement le refroidissement continu de la surface ext\u00e9rieure. Ce n\u2019est qu\u2019une fois que la surface du lingot p\u00e9n\u00e8tre dans la zone de refroidissement direct \u00e0 l\u2019eau qu\u2019un bon effet de refroidissement peut \u00eatre obtenu. Par cons\u00e9quent, afin de minimiser la zone de s\u00e9gr\u00e9gation et la zone de refroidissement insuffisant apr\u00e8s solidification, et d\u2019atteindre l\u2019objectif d\u2019am\u00e9lioration de la structure et de la qualit\u00e9 de surface du lingot, la m\u00e9thode de coul\u00e9e \u00e0 t\u00eate chaude s\u2019av\u00e8re plus adapt\u00e9e. AdTech propose <a href=\"http:\/\/www.alalloycasting.com\/fr\/distributing-launder\/\">tuyau de distribution<\/a>, <a href=\"http:\/\/www.alalloycasting.com\/fr\/ceramic-sprue-bush\/\">Douille de coul\u00e9e en c\u00e9ramique<\/a>, Anneau en c\u00e9ramique d'alumine, Chapeau de coul\u00e9e \u00ab Hot Top \u00bb, <a href=\"http:\/\/www.alalloycasting.com\/fr\/high-purity-graphite-ring\/\">Bague en graphite de haute puret\u00e9<\/a>, Chapeau de coul\u00e9e \u00ab Hot Top \u00bb destin\u00e9 \u00e0 la coul\u00e9e \u00ab Hot Top \u00bb. Cela s'explique par le faible niveau de liquide dans sa cavit\u00e9 effective et par son r\u00e9glage pr\u00e9cis, ce qui rend la structure transversale du lingot produit plus homog\u00e8ne.<\/p>\n<p>De plus, la m\u00e9thode \u00ab hot top \u00bb permet d\u2019obtenir un niveau de coul\u00e9e \u00e9quivalent, facilite l\u2019utilisation du dispositif de purification de la masse fondue et permet de contr\u00f4ler la recontamination de celle-ci pendant la coul\u00e9e. L\u2019oxyde pr\u00e9sent \u00e0 la surface de la masse fondue pendant le processus de coul\u00e9e a peu de chances d\u2019\u00eatre entra\u00een\u00e9 dans la masse. Restez sur la buse de coul\u00e9e. Comme l\u2019entonnoir flottant n\u2019est pas utilis\u00e9, il est peu probable que des cristaux en forme de plumes se forment \u00e0 l\u2019emplacement correspondant de l\u2019entonnoir flottant. Ces avantages, pour l\u2019a\u00e9ronautique et d\u2019autres secteurs industriels importants, exigent la fourniture de moules et de pi\u00e8ces forg\u00e9es \u00e0 faible teneur en air, sans inclusions d\u2019oxydation et pr\u00e9sentant des performances structurelles \u00e9lev\u00e9es, ce qui permettra de r\u00e9pondre de mani\u00e8re satisfaisante aux exigences. Le syst\u00e8me de d\u00e9gazage en ligne fabriqu\u00e9 par AdTech permet d\u2019am\u00e9liorer efficacement la qualit\u00e9 des pi\u00e8ces moul\u00e9es en aluminium ; il est install\u00e9 entre le four et la plate-forme de coul\u00e9e.<\/p>\n<p><img loading=\"lazy\" decoding=\"async\" class=\"alignnone size-full wp-image-6152\" src=\"http:\/\/alalloycasting.com\/wp-content\/uploads\/2020\/11\/CFF-Filtering-Equipment.jpg\" alt=\"\u00c9quipements de filtration CFF\" width=\"500\" height=\"400\" srcset=\"https:\/\/www.alalloycasting.com\/wp-content\/uploads\/2020\/11\/CFF-Filtering-Equipment.jpg 500w, https:\/\/www.alalloycasting.com\/wp-content\/uploads\/2020\/11\/CFF-Filtering-Equipment-300x240.jpg 300w\" sizes=\"auto, (max-width: 500px) 100vw, 500px\" \/><\/p>\n<p>Par ailleurs, gr\u00e2ce \u00e0 la stabilit\u00e9 du proc\u00e9d\u00e9, non seulement le rendement de production de la machine de coul\u00e9e et le taux de rendement de coul\u00e9e sont am\u00e9lior\u00e9s. Pour l'atelier de transformation, le temps d'homog\u00e9n\u00e9isation du lingot est r\u00e9duit, il n'y a pas de s\u00e9gr\u00e9gation en bordure et le r\u00e9seau dendritique sur la section transversale est peu d\u00e9velopp\u00e9, ce qui am\u00e9liore consid\u00e9rablement la vitesse d'extrusion et le taux de rendement, permettant ainsi d'obtenir de meilleurs r\u00e9sultats \u00e9conomiques.<\/p>\n<p>Bien s\u00fbr, \u00e0 l'heure actuelle, la m\u00e9thode \u00ab hot top \u00bb est largement utilis\u00e9e dans la production d'alliages tendres de petit diam\u00e8tre, tant en France qu'\u00e0 l'\u00e9tranger, mais les alliages durs de grand diam\u00e8tre n'ont pas encore re\u00e7u l'attention qu'ils m\u00e9ritent. Cela s'explique principalement par le petit diam\u00e8tre et la vitesse de coul\u00e9e \u00e9lev\u00e9e, les faibles contraintes internes du lingot pendant le processus de coul\u00e9e, ainsi que la faible tendance \u00e0 la fissuration. La situation est diff\u00e9rente pour les lingots de grand diam\u00e8tre, dont la vitesse de coul\u00e9e est fortement limit\u00e9e par le risque de fissuration. Afin d\u2019\u00e9viter les fissures, il est n\u00e9cessaire de r\u00e9duire la vitesse de coul\u00e9e. Cependant, la qualit\u00e9 de surface n\u2019est pas aussi lisse que celle des lingots de petit diam\u00e8tre. \u00c0 long terme, il n\u2019est toutefois pas conseill\u00e9 de se concentrer uniquement sur la qualit\u00e9 de surface et de n\u00e9gliger l\u2019am\u00e9lioration de la qualit\u00e9 interne.<\/p>","protected":false},"excerpt":{"rendered":"<p>The hot top method uses the same level of casting to reduce the drop points of the distribution plate. At the same time, the exposed&hellip;<\/p>","protected":false},"author":1,"featured_media":6151,"comment_status":"closed","ping_status":"closed","sticky":false,"template":"","format":"standard","meta":{"footnotes":""},"categories":[233],"tags":[],"class_list":["post-6150","post","type-post","status-publish","format-standard","has-post-thumbnail","hentry","category-blog"],"yoast_head":"<!-- This site is optimized with the Yoast SEO plugin v27.9 - https:\/\/yoast.com\/product\/yoast-seo-wordpress\/ -->\n<title>Hot Top Method for Aluminum Round Ingot Casting<\/title>\n<meta name=\"description\" content=\"The hot top method can achieve the same level of casting, it is convenient to use the melt purification device - degassing system.\" \/>\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\/hot-top-method\/\" \/>\n<meta property=\"og:locale\" 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