{"id":2950,"date":"2020-07-20T09:13:44","date_gmt":"2020-07-20T09:13:44","guid":{"rendered":"http:\/\/www.alalloycasting.com\/?p=2950"},"modified":"2020-10-19T06:06:01","modified_gmt":"2020-10-19T06:06:01","slug":"cast-aluminum-alloys","status":"publish","type":"post","link":"https:\/\/www.alalloycasting.com\/fr\/cast-aluminum-alloys\/","title":{"rendered":"Alliages d'aluminium moul\u00e9s"},"content":{"rendered":"<p>Les alliages d'aluminium sont class\u00e9s en deux cat\u00e9gories selon leur utilisation : les alliages d'aluminium form\u00e9s et les alliages d'aluminium moul\u00e9s. Les alliages d'aluminium corroy\u00e9s comprennent les portes et fen\u00eatres en alliage d'aluminium d'usage courant, ainsi que les mat\u00e9riaux utilis\u00e9s pour les m\u00e9canismes de la navette spatiale ; ils peuvent \u00eatre trait\u00e9s thermiquement ou non, selon les diff\u00e9rentes exigences d'utilisation ; l'autre type est celui des alliages d'aluminium moul\u00e9s, qui comprennent principalement les alliages d'aluminium-silicium, <a href=\"http:\/\/www.alalloycasting.com\/fr\/cast-aluminum-alloys\/\">alliage d'aluminium et de cuivre<\/a>, ainsi que les alliages d'aluminium-magn\u00e9sium, les alliages d'aluminium-zinc et les alliages d'aluminium aux terres rares, etc.<\/p>\n<p>Dans le processus de production proprement dit, les alliages d'aluminium moul\u00e9s sont class\u00e9s en fonction de leur teneur en divers \u00e9l\u00e9ments chimiques. Le processus de fusion n\u00e9cessite d'ajuster la quantit\u00e9 de mati\u00e8res premi\u00e8res en fonction de la composition chimique r\u00e9elle.<\/p>\n<p>\u00c0 partir de lingots d'aluminium pur comme mati\u00e8re premi\u00e8re, le processus de fusion permet d'ajuster la composition chimique en fonction des besoins r\u00e9els de production. Il permet de fondre diff\u00e9rentes qualit\u00e9s d'alliages d'aluminium \u00e0 l'\u00e9tat liquide et de s'adapter aux exigences de divers produits, quels que soient leurs types. Avant la fusion de l'alliage d'aluminium, la composition doit \u00eatre d\u00e9termin\u00e9e conform\u00e9ment aux exigences. La composition doit \u00eatre d\u00e9termin\u00e9e en fonction des nuances d'alliage, et il convient de prendre en compte la combustion des diff\u00e9rents \u00e9l\u00e9ments au cours du processus de fusion du mat\u00e9riau neuf, du mat\u00e9riau recycl\u00e9 et de l'alliage-ma\u00eetre.<\/p>\n<p>La m\u00e9thode de fusion la plus \u00e9conomique et la plus courante pour la fusion des alliages d\u2019aluminium est la fusion en four \u00e0 gaz, qui exige : une fusion rapide, une dur\u00e9e r\u00e9duite et une absorption d\u2019air moindre. L'ordre d'alimentation influe non seulement sur l'efficacit\u00e9 de la fusion et la consommation d'alliage, mais aussi directement sur la qualit\u00e9 de l'aluminium fondu. Le principe d'alimentation est le suivant : d'abord les petites quantit\u00e9s, puis les grandes ; d'abord les mat\u00e9riaux faciles \u00e0 fondre, puis les plus difficiles ; d'abord les mat\u00e9riaux moins sujets \u00e0 la combustion, puis ceux qui br\u00fblent facilement, et enfin ceux qui se d\u00e9t\u00e9riorent.<\/p>\n<p><img loading=\"lazy\" decoding=\"async\" class=\"alignnone size-full wp-image-5762\" src=\"http:\/\/alalloycasting.com\/wp-content\/uploads\/2020\/07\/Cast-Aluminum-Alloys.jpg\" alt=\"Alliages d&#039;aluminium moul\u00e9s\" width=\"400\" height=\"320\" srcset=\"https:\/\/www.alalloycasting.com\/wp-content\/uploads\/2020\/07\/Cast-Aluminum-Alloys.jpg 400w, https:\/\/www.alalloycasting.com\/wp-content\/uploads\/2020\/07\/Cast-Aluminum-Alloys-300x240.jpg 300w\" sizes=\"auto, (max-width: 400px) 100vw, 400px\" \/><\/p>\n<p>On commence par ajouter de petits morceaux de mati\u00e8re de r\u00e9chauffage, des lingots d\u2019alliage d\u2019aluminium \u00e0 point de fusion plus bas (tels que l\u2019alliage Al-Si), puis des lingots d\u2019aluminium de plus grand volume et \u00e0 point de fusion plus \u00e9lev\u00e9, ainsi que des alliages interm\u00e9diaires (tels que l\u2019Al-Mn), du Mg, etc. Les \u00e9l\u00e9ments qui br\u00fblent facilement sont ajout\u00e9s en dernier. Les petits morceaux de mat\u00e9riaux recycl\u00e9s sont d\u2019abord plac\u00e9s au fond du four afin de prot\u00e9ger le corps du four et de r\u00e9duire l\u2019impact sur la paroi du four lors du chargement des gros morceaux de charge. De plus, comme les mat\u00e9riaux recycl\u00e9s ont un point de fusion bas et fondent facilement, cela permet d\u2019am\u00e9liorer l\u2019efficacit\u00e9 de la fusion lorsque les mati\u00e8res premi\u00e8res ayant des points de fusion plus \u00e9lev\u00e9s sont fondues par la suite. Ajouter du Mg pour abaisser la temp\u00e9rature et r\u00e9duire les pertes par combustion.<\/p>\n<p>La fusion est un processus au cours duquel un solide est chauff\u00e9 jusqu\u2019\u00e0 se transformer en un liquide fluide. Une fois le chargement termin\u00e9, la fusion commence. Pendant le processus de fusion, il faut veiller \u00e0 ce que celle-ci soit rapide et homog\u00e8ne, et \u00e0 ce que la temp\u00e9rature \u00e0 proximit\u00e9 de la flamme soit plus \u00e9lev\u00e9e, atteignant 1 200 \u00b0C ou plus. Afin d\u2019\u00e9viter toute surchauffe locale et des temp\u00e9ratures excessives, une oxydation importante de l\u2019alliage d\u2019aluminium causerait des difficult\u00e9s lors de l\u2019affinage ult\u00e9rieur du produit. Il convient de proc\u00e9der \u00e0 une agitation pendant le processus de fusion, et la charge non fondue doit \u00eatre racl\u00e9e dans l\u2019aluminium fondu afin qu\u2019elle soit presque enti\u00e8rement immerg\u00e9e et m\u00e9lang\u00e9e de mani\u00e8re homog\u00e8ne pour \u00e9viter toute surchauffe locale. Pour les derniers \u00e9l\u00e9ments immerg\u00e9s, tels que le Mg, la flamme ne peut pas les chauffer et les faire fondre directement. L\u2019aluminium liquide \u00e9tant immerg\u00e9 dans les mati\u00e8res premi\u00e8res, la temp\u00e9rature est abaiss\u00e9e et les \u00e9l\u00e9ments tels que le Mg sont maintenus \u00e0 une temp\u00e9rature de fusion relativement basse, ce qui r\u00e9duit les pertes par combustion et am\u00e9liore le rendement de combustion.<\/p>\n<p>L'alliage d'aluminium commence \u00e0 fondre \u00e0 environ 600 \u2103 ; la temp\u00e9rature est ensuite port\u00e9e \u00e0 660 \u2103 pour assurer une fusion compl\u00e8te, et la temp\u00e9rature de fusion est contr\u00f4l\u00e9e de mani\u00e8re \u00e0 ne pas d\u00e9passer 760 \u2103. Lorsque la temp\u00e9rature de fusion d\u00e9passe 770 \u2103, l\u2019oxydation de l\u2019alliage d\u2019aluminium est importante, l\u2019absorption d\u2019hydrog\u00e8ne et les inclusions de scories augmentent pendant le processus de fusion, les grains cristallins apparaissent grossiers lors de la coul\u00e9e et de la solidification, et les propri\u00e9t\u00e9s m\u00e9caniques sont r\u00e9duites. Afin de r\u00e9duire l\u2019oxydation de l\u2019alliage d\u2019aluminium pendant la fusion, on ajoute entre 0,41 TP3T et 0,51 TP3T d\u2019agent de recouvrement au cours du processus de fusion pour prot\u00e9ger le film d\u2019oxyde \u00e0 la surface de l\u2019alliage d\u2019aluminium contre toute d\u00e9t\u00e9rioration. La composition chimique de cet agent de recouvrement est similaire \u00e0 celle de l\u2019agent de nettoyage.<\/p>\n<p>La temp\u00e9rature du processus de fusion est maintenue entre 720 et 760 \u2103. Une fois qu\u2019une partie du lingot d\u2019aluminium est fondue, on ajoute des mati\u00e8res premi\u00e8res pr\u00e9sentant des points de fusion plus \u00e9lev\u00e9s, telles que le Si et le Ti. Le Ti forme des noyaux h\u00e9t\u00e9rog\u00e8nes dans l\u2019alliage afin d\u2019affiner la structure. Il est inject\u00e9 dans l\u2019aluminium en fusion pour se fondre et r\u00e9duire les pertes par combustion. Une fois le lingot d\u2019aluminium pratiquement fondu, on ajoute des \u00e9l\u00e9ments d\u2019alliage tels que le Mg et le Cu, qui br\u00fblent facilement. Il ne faut pas les ajouter trop t\u00f4t pour limiter les pertes par combustion, ni trop tard pour ne pas nuire \u00e0 la diffusion et \u00e0 la s\u00e9gr\u00e9gation. Fermer la porte du four pour poursuivre la fusion.<\/p>","protected":false},"excerpt":{"rendered":"<p>Aluminum alloys are classified into deformed aluminum alloys and cast aluminum alloys according to their uses. Wrought aluminum alloys include daily-used aluminum alloy doors and&hellip;<\/p>","protected":false},"author":1,"featured_media":5762,"comment_status":"closed","ping_status":"closed","sticky":false,"template":"","format":"standard","meta":{"footnotes":""},"categories":[233],"tags":[1676],"class_list":["post-2950","post","type-post","status-publish","format-standard","has-post-thumbnail","hentry","category-blog","tag-cast-aluminum-alloys"],"yoast_head":"<!-- This site is optimized with the Yoast SEO plugin v27.9 - https:\/\/yoast.com\/product\/yoast-seo-wordpress\/ -->\n<title>Cast Aluminum Alloys,Smelting Process for Aluminum Alloys<\/title>\n<meta name=\"description\" content=\"Cast aluminum alloys mainly including aluminum-silicon alloys, aluminum-copper alloys, and aluminum-magnesium alloys, Aluminum-zinc alloy.\" \/>\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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