flux<\/a> Les sels \u00e0 bas point de fusion (tels que le NaCl, le KCl ou le Na\u2083AlF\u2086) sont couramment utilis\u00e9s pour isoler l'aluminium liquide de l'air. Il convient de r\u00e9duire au maximum l\u2019agitation et de d\u00e9gazer l\u2019aluminium liquide \u00e0 un stade avanc\u00e9 de la fusion. L\u2019affinage consiste \u00e0 faire passer du chlore gazeux dans l\u2019aluminium liquide, ou \u00e0 ajouter de l\u2019hexachloro\u00e9thane et du chlorure de zinc pour former des bulles, de sorte que l\u2019hydrog\u00e8ne dissous dans l\u2019aluminium liquide p\u00e9n\u00e8tre dans les bulles et pr\u00e9cipite. Au cours du processus de remont\u00e9e des bulles, le gaz et les inclusions d\u2019Al\u2082O\u2083 pr\u00e9sents dans l\u2019aluminium liquide sont \u00e9limin\u00e9s de la surface du liquide, ce qui permet d\u2019obtenir un aluminium liquide pur.<\/p>\n![\"Proc\u00e9d\u00e9](\"http:\/\/alalloycasting.com\/wp-content\/uploads\/2020\/05\/Aluminum-Casting-Process.jpg\")
<\/p>\n
Proc\u00e9d\u00e9 de moulage de l'aluminium<\/h2>\n
L'alliage d'aluminium moul\u00e9 pr\u00e9sente un point de fusion bas et est g\u00e9n\u00e9ralement fondu dans un creuset. Le moulage au sable fin permet de r\u00e9duire la rugosit\u00e9 de surface de la pi\u00e8ce moul\u00e9e. Afin d'\u00e9viter l'oxydation et l'inhalation de l'aluminium liquide pendant le processus de coul\u00e9e, on utilise g\u00e9n\u00e9ralement un syst\u00e8me de coul\u00e9e ouvert et on pr\u00e9voit davantage de canaux de coul\u00e9e internes. Les canaux de coul\u00e9e droits ont souvent la forme d'un serpent ou d'un col de cygne, ce qui permet \u00e0 l'alliage de remplir rapidement et en douceur la cavit\u00e9 sans \u00e9claboussures, tourbillons ni chocs. Les pi\u00e8ces moul\u00e9es en alliage d'aluminium peuvent \u00eatre r\u00e9alis\u00e9es selon diverses m\u00e9thodes de moulage.<\/p>\n
La fusion et la coul\u00e9e des alliages d'aluminium constituent les \u00e9tapes cl\u00e9s de la production par moulage. Un contr\u00f4le rigoureux de l'ensemble du processus de fusion et de coul\u00e9e joue un r\u00f4le essentiel dans la pr\u00e9vention des d\u00e9fauts de coul\u00e9e. Le m\u00e9tal d'aluminium fondu a une forte tendance \u00e0 absorber l'hydrog\u00e8ne, poss\u00e8de un fort pouvoir oxydant et dissout facilement le fer. Des pr\u00e9cautions simples mais rigoureuses doivent \u00eatre prises pendant les processus de fusion et de coul\u00e9e afin d'obtenir des pi\u00e8ces moul\u00e9es de haute qualit\u00e9.<\/p>","protected":false},"excerpt":{"rendered":"
Aluminum is an active metal element, and aluminum easily oxidizes and absorbs the gas in the aluminum casting process. The aluminum oxidation (Al2O3) has a…<\/p>","protected":false},"author":1,"featured_media":1566,"comment_status":"closed","ping_status":"closed","sticky":false,"template":"","format":"standard","meta":{"footnotes":""},"categories":[233],"tags":[35],"class_list":["post-1130","post","type-post","status-publish","format-standard","has-post-thumbnail","hentry","category-blog","tag-aluminum-casting-process"],"yoast_head":"\n
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