{"id":1943,"date":"2020-05-18T10:17:55","date_gmt":"2020-05-18T10:17:55","guid":{"rendered":"http:\/\/alalloycasting.com\/?p=1943"},"modified":"2020-08-31T06:38:09","modified_gmt":"2020-08-31T06:38:09","slug":"aluminum-alloy-casting-process","status":"publish","type":"post","link":"https:\/\/www.alalloycasting.com\/fr\/aluminum-alloy-casting-process\/","title":{"rendered":"Proc\u00e9d\u00e9 de moulage d'alliages d'aluminium"},"content":{"rendered":"

Les param\u00e8tres du processus de coul\u00e9e des alliages d'aluminium comprennent principalement la temp\u00e9rature de coul\u00e9e, la vitesse de coul\u00e9e et l'intensit\u00e9 de refroidissement, suivis par la hauteur du niveau de liquide, les accessoires de coul\u00e9e \u00ab hot top \u00bb, etc. AdTech est sp\u00e9cialis\u00e9e dans les fonderies d'alliages d'aluminium et fournit des \u00e9quipements de purification ainsi que des accessoires de coul\u00e9e \u00ab hot top \u00bb afin de r\u00e9soudre les probl\u00e8mes rencontr\u00e9s par ces derni\u00e8res.<\/p>\n

Proc\u00e9d\u00e9 de moulage d'alliages d'aluminium<\/h2>\n

Temp\u00e9rature de coul\u00e9e<\/strong><\/p>\n

\u00c0 l'heure actuelle, la plupart des proc\u00e9d\u00e9s de moulage d'alliages d'aluminium ont adopt\u00e9 syst\u00e8me de d\u00e9gazage en ligne<\/a> et les dispositifs de filtration. L'exp\u00e9rience a d\u00e9montr\u00e9 que des temp\u00e9ratures diff\u00e9rentes du liquide dans le dispositif de d\u00e9gazage en ligne entra\u00eenent des effets de d\u00e9gazage diff\u00e9rents. Il est donc n\u00e9cessaire de tenir compte des exigences en mati\u00e8re de temp\u00e9rature du liquide pour garantir l'efficacit\u00e9 du d\u00e9gazage du dispositif de d\u00e9gazage en ligne. De plus, il convient \u00e9galement de prendre en compte l\u2019\u00e9volution des gaz dans le liquide pr\u00e9sent dans le cristalliseur. En raison de la faible temp\u00e9rature de coul\u00e9e, les gaz pr\u00e9sents dans le cristalliseur ne parviennent pas \u00e0 remonter \u00e0 la surface du liquide \u00e0 temps, ce qui entra\u00eene une porosit\u00e9 et un manque de densit\u00e9, et peut \u00e9galement causer des d\u00e9fauts de qualit\u00e9 tels que la pr\u00e9sence de scories et des zones d\u2019isolation \u00e0 froid. La temp\u00e9rature de coul\u00e9e ne doit pas d\u00e9passer la temp\u00e9rature de fusion. Une temp\u00e9rature de coul\u00e9e trop \u00e9lev\u00e9e provoquera des fuites d\u2019aluminium au d\u00e9but de la coul\u00e9e. \u00c9tant donn\u00e9 que la longueur de l\u2019outil de transfert varie et que la chute de temp\u00e9rature du liquide diff\u00e8re, il existe un point de r\u00e9chauffement sur la ligne, et la temp\u00e9rature du liquide fluctue consid\u00e9rablement pendant le processus de transfert. Par cons\u00e9quent, la temp\u00e9rature de coul\u00e9e doit \u00eatre d\u00e9termin\u00e9e en fonction de la temp\u00e9rature du liquide inject\u00e9 dans le cristalliseur. En g\u00e9n\u00e9ral, la temp\u00e9rature de coul\u00e9e est sup\u00e9rieure de 50 \u00b0C \u00e0 70 \u00b0C \u00e0 la temp\u00e9rature de cristallisation r\u00e9elle de l\u2019alliage. La zone de transition des alliages d\u2019aluminium des s\u00e9ries 1xxx et 3xxx dans la machine de coul\u00e9e est \u00e9troite, et la temp\u00e9rature de coul\u00e9e doit \u00eatre \u00e9lev\u00e9e. La zone de transition des alliages des s\u00e9ries 2xxx et 7xxx est plus large. La temp\u00e9rature de coul\u00e9e doit \u00eatre inf\u00e9rieure.<\/p>\n

\"Proc\u00e9d\u00e9<\/p>\n

Vitesse de lancement<\/strong><\/p>\n

Dans la coul\u00e9e continue, la longueur de la lingote form\u00e9e par unit\u00e9 de temps est appel\u00e9e \u00ab vitesse de coul\u00e9e \u00bb. La coul\u00e9e traditionnelle correspond g\u00e9n\u00e9ralement \u00e0 un ordre de coul\u00e9e \u00e0 vitesse fixe. La coul\u00e9e moderne repose sur une vitesse de coul\u00e9e variable, c'est-\u00e0-dire que la vitesse de coul\u00e9e au d\u00e9but et pendant le processus n'est pas la m\u00eame. Les variations de vitesse de coul\u00e9e (rapide et lente) ont une grande influence sur les fissures du lingot, la qualit\u00e9 de sa surface, sa structure et ses performances. Dans la mesure o\u00f9 la qualit\u00e9 du lingot est garantie, il convient d'utiliser une vitesse de coul\u00e9e \u00e9lev\u00e9e. La m\u00e9thode de coul\u00e9e moderne adopte une courbe de vitesse de coul\u00e9e, qui remplace les anciens proc\u00e9d\u00e9s de \u00ab fond de coul\u00e9e \u00bb ou de \u00ab recuit \u00bb. Elle permet non seulement de r\u00e9duire certaines installations auxiliaires, mais aussi d\u2019\u00e9conomiser de la main-d\u2019\u0153uvre et de diminuer l\u2019intensit\u00e9 du travail, tout en \u00e9vitant certains d\u00e9fauts de qualit\u00e9 de la surface de la coul\u00e9e. Le choix de la vitesse de coul\u00e9e. En r\u00e8gle g\u00e9n\u00e9rale, pour les alliages et les lingots pr\u00e9sentant une forte tendance aux fissures \u00e0 froid, il convient d\u2019augmenter la vitesse de coul\u00e9e. Pour les alliages et les lingots pr\u00e9sentant une forte tendance aux fissures thermiques, la vitesse de coul\u00e9e doit \u00eatre r\u00e9duite.<\/p>\n

Puissance de refroidissement<\/strong><\/p>\n

L'intensit\u00e9 de refroidissement est \u00e9galement appel\u00e9e vitesse de refroidissement. Elle influe non seulement sur la formation de fissures dans le lingot, mais exerce \u00e9galement une influence plus importante sur la structure de celui-ci. \u00c0 mesure que l'intensit\u00e9 de refroidissement augmente, la vitesse de cristallisation du lingot s'acc\u00e9l\u00e8re, la structure intragranulaire s'affine et la cavit\u00e9 liquide du lingot s'amenuise. La taille de la zone de transition est r\u00e9duite, ce qui am\u00e9liore les conditions de compactage du m\u00e9tal et r\u00e9duit, voire \u00e9limine, les d\u00e9fauts tels que le rel\u00e2chement et la porosit\u00e9 dans le lingot. La densit\u00e9 du lingot augmente, et la taille des compos\u00e9s primaires peut \u00eatre affin\u00e9e afin de r\u00e9duire le degr\u00e9 de s\u00e9gr\u00e9gation r\u00e9gionale.<\/p>\n

Avec le d\u00e9veloppement des techniques de coul\u00e9e, les proc\u00e9d\u00e9s modernes int\u00e8grent d\u00e9sormais un cristalliseur. Lors de la coul\u00e9e avec un ancien cristalliseur, la consommation d\u2019eau de refroidissement est importante, ce qui entra\u00eene in\u00e9vitablement certains d\u00e9fauts de qualit\u00e9 du lingot. En revanche, lors de la coul\u00e9e avec un cristalliseur moderne, la consommation d\u2019eau de refroidissement est faible. La pratique a d\u00e9montr\u00e9 qu\u2019elle ne repr\u00e9sente qu\u2019environ 70% de la consommation d\u2019eau de l\u2019ancien cristalliseur. \u00c0 l\u2019heure actuelle, la plupart des pays \u00e9trangers ont recours \u00e0 la coul\u00e9e avec cristalliseur \u00e0 faible volume de liquide, dont l\u2019objectif est d\u2019augmenter la force de refroidissement et de r\u00e9duire, voire d\u2019\u00e9liminer, le ph\u00e9nom\u00e8ne de r\u00e9chauffement de la zone d\u2019entrefer apr\u00e8s le refroidissement primaire. Il n\u2019y a donc pratiquement pas de situation de trempe par refroidissement secondaire, et les lingots sont g\u00e9n\u00e9ralement coul\u00e9s \u00e0 plat.<\/p>\n

On ne peut ignorer l'influence de la temp\u00e9rature de l'eau de refroidissement sur la r\u00e9sistance au rin\u00e7age \u00e0 froid. Normalement, la temp\u00e9rature de l'eau de refroidissement est fix\u00e9e \u00e0 20, mais en raison des conditions climatiques r\u00e9gionales, les diff\u00e9rences li\u00e9es aux conditions des installations d'alimentation en eau et \u00e0 la temp\u00e9rature de l'usine ont entra\u00een\u00e9 d'importantes variations, ce qui se traduit par des d\u00e9fauts de qualit\u00e9 des lingots \u00e0 l'\u00e9chelle r\u00e9gionale ou saisonni\u00e8re. Le syst\u00e8me moderne d'alimentation en eau du cristalliseur dispose d'une fonction de transformation par impulsions ou en phase crois\u00e9e, d\u00e9termin\u00e9e par la programmation du processus, ce qui permet de r\u00e9gler l'intensit\u00e9 du refroidissement sous forme de courbe en fonction des besoins du processus de coul\u00e9e.<\/p>","protected":false},"excerpt":{"rendered":"

Aluminum alloy casting process parameters mainly include casting temperature, casting speed, cooling intensity, followed by liquid level height, hot top casting accessories, etc. AdTech specializes…<\/p>","protected":false},"author":1,"featured_media":4330,"comment_status":"closed","ping_status":"closed","sticky":false,"template":"","format":"standard","meta":{"footnotes":""},"categories":[138],"tags":[159,160],"class_list":["post-1943","post","type-post","status-publish","format-standard","has-post-thumbnail","hentry","category-seo","tag-aluminum-alloy-casting-process","tag-aluminum-casting"],"yoast_head":"\nAluminum Alloy Casting Process | Hot Top Casting<\/title>\n<meta name=\"description\" content=\"Aluminum alloy casting process parameters mainly include casting temperature, casting speed, cooling intensity, hot top casting accessories.\" \/>\n<meta name=\"robots\" content=\"index, follow, max-snippet:-1, max-image-preview:large, max-video-preview:-1\" \/>\n<link rel=\"canonical\" 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