{"id":1183,"date":"2020-04-17T06:32:11","date_gmt":"2020-04-17T06:32:11","guid":{"rendered":"http:\/\/alalloycasting.com\/?p=1183"},"modified":"2020-08-28T05:47:46","modified_gmt":"2020-08-28T05:47:46","slug":"molten-aluminum-casting","status":"publish","type":"post","link":"https:\/\/www.alalloycasting.com\/fr\/molten-aluminum-casting\/","title":{"rendered":"Moulage d'aluminium en fusion"},"content":{"rendered":"

La fusion et la coul\u00e9e des alliages d'aluminium constituent les \u00e9tapes cl\u00e9s de la production de pi\u00e8ces moul\u00e9es en aluminium fondu. Le contr\u00f4le rigoureux de l'ensemble du processus de fusion et de coul\u00e9e joue un r\u00f4le important dans la pr\u00e9vention des d\u00e9fauts des pi\u00e8ces moul\u00e9es en aluminium fondu. L'aluminium fondu ayant une forte tendance \u00e0 absorber l'hydrog\u00e8ne, son pouvoir oxydant est \u00e9lev\u00e9. Des pr\u00e9cautions doivent \u00eatre prises pendant les op\u00e9rations de fusion et de moulage de l'aluminium fondu afin d'obtenir des pi\u00e8ces moul\u00e9es de haute qualit\u00e9.<\/p>\n

Contr\u00f4le des mati\u00e8res premi\u00e8res<\/h2>\n

Afin d'obtenir une fonte d'aluminium de haute qualit\u00e9, il convient tout d'abord de s\u00e9lectionner des mati\u00e8res premi\u00e8res conformes aux normes. Celles-ci doivent faire l'objet d'une gestion rigoureuse et \u00eatre manipul\u00e9es de mani\u00e8re appropri\u00e9e. Dans le cas contraire, cela affectera gravement la qualit\u00e9 de l'alliage. La charge doit \u00eatre sabl\u00e9e avant utilisation afin d'\u00e9liminer la rouille superficielle, la graisse et tout autre contaminant. Toutes les charges doivent \u00eatre pr\u00e9chauff\u00e9es avant d'entrer dans le four afin d'\u00e9liminer l'humidit\u00e9 pr\u00e9sente \u00e0 la surface et de r\u00e9duire le temps de fusion \u00e0 moins de 3 heures.<\/p>\n

\"\"<\/p>\n

Pr\u00e9paration des pi\u00e8ces moul\u00e9es \u00e0 chaud<\/h2>\n

Les creusets neufs et les anciens creusets qui n'ont pas \u00e9t\u00e9 utilis\u00e9s depuis longtemps doivent \u00eatre sabl\u00e9s avant utilisation, puis chauff\u00e9s \u00e0 une temp\u00e9rature comprise entre 700 et 800 degr\u00e9s pendant 2 \u00e0 4 heures. Afin d'\u00e9liminer l'eau et les substances combustibles adh\u00e9rant \u00e0 la paroi interne du creuset, une fois celui-ci refroidi en dessous de 300 degr\u00e9s, nettoyez soigneusement la paroi interne du creuset, puis appliquez la peinture lorsque la temp\u00e9rature est d'au moins 200 degr\u00e9s.<\/p>\n

Pi\u00e8ces moul\u00e9es \u00e0 chaud<\/a> Il convient de le pr\u00e9chauffer avant utilisation, puis de l'enduire d'une peinture protectrice \u00e0 une temp\u00e9rature comprise entre 150 et 200 degr\u00e9s, et de le laisser s\u00e9cher compl\u00e8tement. Apr\u00e8s utilisation, les oxydes et les fluorures qui se sont d\u00e9pos\u00e9s \u00e0 la surface doivent \u00eatre soigneusement \u00e9limin\u00e9s.<\/p>\n

\"Coupelle
Coupelle de coul\u00e9e en titanate d'aluminium<\/figcaption><\/figure>\n

Contr\u00f4le de la temp\u00e9rature de fusion<\/h2>\n

La temp\u00e9rature de fusion est trop basse, ce qui ne favorise pas la dissolution des \u00e9l\u00e9ments d'alliage ni l'\u00e9vacuation des gaz et des inclusions. De plus, en raison de la chaleur insuffisante du canal de coul\u00e9e, les pi\u00e8ces moul\u00e9es en aluminium fondu ne peuvent pas \u00eatre correctement compens\u00e9es. Une temp\u00e9rature de fusion excessive constitue non seulement un gaspillage d'\u00e9nergie, mais pr\u00e9sente \u00e9galement un inconv\u00e9nient plus grave : en effet, plus la temp\u00e9rature est \u00e9lev\u00e9e, plus l'absorption d'hydrog\u00e8ne est importante, plus les grains cristallins sont grossiers et plus l'oxydation de l'aluminium est importante.<\/p>\n

Temps de fusion<\/h2>\n

Afin de r\u00e9duire l'oxydation et le pi\u00e9geage de l'aluminium fondu, il convient de r\u00e9duire autant que possible le temps de s\u00e9jour de l'aluminium fondu dans le four et d'acc\u00e9l\u00e9rer la fusion. Du d\u00e9but de la fusion \u00e0 la fin de la coul\u00e9e, le temps de s\u00e9jour ne doit pas d\u00e9passer 4 heures pour la coul\u00e9e d'aluminium fondu en moule de sable, 6 heures pour la coul\u00e9e en moule perdu et 8 heures pour la coul\u00e9e sous pression.<\/p>\n

Transfert d'aluminium fondu<\/h2>\n

Bien que la densit\u00e9 de l'alumine solide soit similaire \u00e0 celle de l'aluminium fondu, une fois introduite dans ce dernier, il lui faut un temps suffisamment long pour couler jusqu'au fond du creuset. Le film d\u2019oxyde d\u2019aluminium qui se forme apr\u00e8s l\u2019oxydation de l\u2019aluminium fondu n\u2019est dense que du c\u00f4t\u00e9 en contact avec l\u2019aluminium fondu ; le c\u00f4t\u00e9 en contact avec l\u2019air est poreux et pr\u00e9sente un grand nombre de petits trous d\u2019un diam\u00e8tre compris entre 60 et 100 \u00c5. Il poss\u00e8de une grande surface sp\u00e9cifique et un fort pouvoir d\u2019adsorption. Il adsorbe facilement la vapeur d\u2019eau et a tendance \u00e0 remonter \u00e0 la surface.<\/p>\n

Par cons\u00e9quent, la diff\u00e9rence de densit\u00e9 entre ce film d\u2019oxyde et l\u2019aluminium en fusion est faible ; il se m\u00e9lange donc \u00e0 la masse fondue, sa vitesse de remont\u00e9e \u00e0 la surface est tr\u00e8s lente, il est difficile \u00e0 \u00e9liminer de la masse fondue, et la formation de pores dans la pi\u00e8ce moul\u00e9e en aluminium fondu est trop importante. Par cons\u00e9quent, la cl\u00e9 du transfert de l'aluminium en fusion consiste \u00e0 r\u00e9duire au minimum l'agitation du m\u00e9tal en fusion et \u00e0 minimiser le contact entre la masse fondue et l'air.<\/p>\n

Coul\u00e9e d'aluminium fondu<\/h2>\n

Lors de l'utilisation du creuset basculant pour transf\u00e9rer la masse fondue, afin d'\u00e9viter tout m\u00e9lange entre celle-ci et l'air, la poche de coul\u00e9e doit \u00eatre plac\u00e9e aussi pr\u00e8s que possible de la buse du four et inclin\u00e9e. Faites couler la masse fondue le long de la paroi lat\u00e9rale de la poche, afin qu'elle ne heurte pas directement le fond de celle-ci, ce qui provoquerait une agitation et des projections.<\/p>","protected":false},"excerpt":{"rendered":"

Aluminum alloy smelting and pouring are the main links in molten aluminum casting production. The strict control of the entire process of melting and pouring…<\/p>","protected":false},"author":1,"featured_media":1578,"comment_status":"closed","ping_status":"closed","sticky":false,"template":"","format":"standard","meta":{"footnotes":""},"categories":[233],"tags":[37],"class_list":["post-1183","post","type-post","status-publish","format-standard","has-post-thumbnail","hentry","category-blog","tag-molten-aluminum-casting"],"yoast_head":"\nMolten Aluminum Casting | Foundry Aluminum Casting<\/title>\n<meta name=\"description\" content=\"The strict control of the entire process of melting and pouring plays an important role in molten aluminum casting defects.\" \/>\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\/molten-aluminum-casting\/\" \/>\n<meta property=\"og:locale\" content=\"fr_FR\" \/>\n<meta property=\"og:type\" content=\"article\" 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