{"id":7297,"date":"2020-12-30T02:50:46","date_gmt":"2020-12-30T02:50:46","guid":{"rendered":"http:\/\/www.alalloycasting.com\/?p=7297"},"modified":"2020-12-31T08:54:35","modified_gmt":"2020-12-31T08:54:35","slug":"rotary-degassing-for-casting","status":"publish","type":"post","link":"https:\/\/www.alalloycasting.com\/fr\/rotary-degassing-for-casting\/","title":{"rendered":"D\u00e9gazage rotatif pour la fonderie"},"content":{"rendered":"

Alors que la demande en pi\u00e8ces moul\u00e9es en m\u00e9taux non ferreux (notamment en aluminium et en alliages d\u2019aluminium) ne cesse de cro\u00eetre, la pression exerc\u00e9e sur les fonderies pour qu\u2019elles am\u00e9liorent la qualit\u00e9 de leurs moulages s\u2019intensifie \u00e9galement. Les sp\u00e9cifications techniques de la plupart des applications industrielles, notamment dans les secteurs de la construction, de l\u2019ing\u00e9nierie, des transports, ainsi que dans les secteurs a\u00e9rospatial et automobile, ont connu une augmentation rapide ces derni\u00e8res ann\u00e9es. Afin d'\u00e9liminer les impuret\u00e9s de la masse fondue et d'obtenir un m\u00e9tal plus pur et de meilleure qualit\u00e9, l'une des m\u00e9thodes de purification les plus courantes et les plus efficaces utilis\u00e9es par les fonderies est le d\u00e9gazage rotatif.<\/p>\n

On distingue deux grands types d'impuret\u00e9s pr\u00e9sentes dans l'aluminium fondu : l'hydrog\u00e8ne dissous et les inclusions non m\u00e9talliques solides.<\/p>\n

Au fur et \u00e0 mesure que le m\u00e9tal refroidit, l'hydrog\u00e8ne dissous s'\u00e9chappe de la solution et forme des pores nuisibles. Cette porosit\u00e9 et ces inclusions solides non m\u00e9talliques r\u00e9duisent la r\u00e9sistance et nuisent aux performances finales des pi\u00e8ces moul\u00e9es en aluminium.<\/p>\n

Cette r\u00e9action entra\u00eene la formation de couches d'oxyde \u00e0 la surface du m\u00e9tal en fusion pendant le processus de fusion et le transfert ult\u00e9rieur du m\u00e9tal en fusion. Les oxydes produits sont pi\u00e9g\u00e9s dans la majeure partie du m\u00e9tal en fusion, puis transf\u00e9r\u00e9s vers la pi\u00e8ce moul\u00e9e finie. D'autres inclusions non m\u00e9talliques, telles que les carbures, les nitrures ou les borures, peuvent provenir de sources telles que les mat\u00e9riaux des creusets ou d'autres mat\u00e9riaux r\u00e9fractaires.<\/p>\n

Toute inclusion qui se formerait entra\u00eenerait des d\u00e9fauts structurels dans la pi\u00e8ce moul\u00e9e, ce qui nuirait \u00e0 ses propri\u00e9t\u00e9s m\u00e9caniques, causerait des difficult\u00e9s de mise en \u0153uvre et pourrait endommager la machine-outil.<\/p>\n

C'est pourquoi, pour obtenir la meilleure qualit\u00e9 possible, il est n\u00e9cessaire d'\u00e9liminer l'hydrog\u00e8ne dissous et les inclusions non m\u00e9talliques du m\u00e9tal en fusion avant la coul\u00e9e.<\/p>\n

\u00c0 mesure que la demande mondiale en termes de volume et de qualit\u00e9 des pi\u00e8ces moul\u00e9es en aluminium augmente, le secteur se mondialise davantage et la concurrence entre les fonderies s'intensifie. Les fonderies doivent mettre en \u0153uvre les proc\u00e9d\u00e9s les plus efficaces et les plus rentables afin de proposer des pi\u00e8ces moul\u00e9es \u00e0 des prix comp\u00e9titifs.<\/p>\n

\"D\u00e9gazage<\/p>\n

Le d\u00e9gazage rotatif pour la coul\u00e9e sert \u00e0 purifier le m\u00e9tal et repose sur un proc\u00e9d\u00e9 physique utilisant un flux de gaz inerte. Il est recommand\u00e9 de d\u00e9gazer l\u2019aluminium \u00e0 l\u2019aide d\u2019azote sec ou d\u2019argon. L\u2019hydrog\u00e8ne dissous dans le m\u00e9tal en fusion se diffuse dans les bulles ascendantes du gaz de flux et est transport\u00e9 vers la surface du m\u00e9tal en fusion. Les oxydes et autres inclusions non m\u00e9talliques sont principalement \u00e9limin\u00e9s par flottation, car de petites bulles inertes se fixent sur les oxydes et remontent ensuite \u00e0 la surface du bain. Les principes qui s'appliquent \u00e0 l'\u00e9limination de l'hydrog\u00e8ne s'appliquent \u00e9galement \u00e0 l'\u00e9limination des oxydes.<\/p>\n

Le principe de d\u00e9gazage par rotation<\/a> est d'augmenter la surface du gaz d'intercalation en contact avec le m\u00e9tal. Une surface plus importante augmente le taux de transfert du m\u00e9tal vers le gaz inerte. Pour un volume de gaz donn\u00e9, plus la taille des bulles est petite, plus la surface est grande. Par exemple, une bulle d\u2019un diam\u00e8tre de 1 pouce pr\u00e9sente une surface de 6 pouces carr\u00e9s. Si cette m\u00eame bulle est divis\u00e9e en bulles d\u2019un diam\u00e8tre de 1\/16 de pouce, la surface passe \u00e0 96 pouces carr\u00e9s. Les bulles plus petites perturbent moins la surface de la masse fondue, ce qui r\u00e9duit l\u2019absorption suppl\u00e9mentaire d\u2019hydrog\u00e8ne dans les environnements humides.<\/p>","protected":false},"excerpt":{"rendered":"

As the demand for non-ferrous metal castings (especially aluminum and aluminum alloy castings) continues to grow, the pressure of foundries to improve casting quality is…<\/p>","protected":false},"author":1,"featured_media":7298,"comment_status":"closed","ping_status":"closed","sticky":false,"template":"","format":"standard","meta":{"footnotes":""},"categories":[233],"tags":[8305,8315,8328,8329,8331,8327,8307,8311,8310,8312,8309,8314,8313,8317,8308,8316,8318,8321,8320,8323,8326,8324,8319,8322,8325,8306,8330,8304],"class_list":["post-7297","post","type-post","status-publish","format-standard","has-post-thumbnail","hentry","category-blog","tag-rotary-degassing-for-alcoa-fjardaal","tag-rotary-degassing-for-alcoa-iceland-aluminium","tag-rotary-degassing-for-alcoa-iceland-aluminum","tag-rotary-degassing-for-aluminium-company-in-iceland","tag-rotary-degassing-for-century-aluminum","tag-rotary-degassing-for-century-iceland-aluminum","tag-rotary-degassing-for-iceland-aluminium","tag-rotary-degassing-for-iceland-aluminium-company","tag-rotary-degassing-for-iceland-aluminium-exports","tag-rotary-degassing-for-iceland-aluminium-factory","tag-rotary-degassing-for-iceland-aluminium-foil","tag-rotary-degassing-for-iceland-aluminium-industry","tag-rotary-degassing-for-iceland-aluminium-mine","tag-rotary-degassing-for-iceland-aluminium-production","tag-rotary-degassing-for-iceland-aluminium-smelter","tag-rotary-degassing-for-iceland-aluminium-statistics","tag-rotary-degassing-for-iceland-aluminum","tag-rotary-degassing-for-iceland-aluminum-company","tag-rotary-degassing-for-iceland-aluminum-exports","tag-rotary-degassing-for-iceland-aluminum-industry","tag-rotary-degassing-for-iceland-aluminum-plants","tag-rotary-degassing-for-iceland-aluminum-production","tag-rotary-degassing-for-iceland-aluminum-smelter","tag-rotary-degassing-for-iceland-aluminum-smelting-plant","tag-rotary-degassing-for-iceland-aluminum-tariffs","tag-rotary-degassing-for-nordic-aluminum-conordural","tag-rotary-degassing-for-rio-tinto-alcan-aluminium-smelter","tag-rotary-degassing-for-rio-tinto-alcan-iceland-co-ltd-isal"],"yoast_head":"\nRotary 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