{"id":12441,"date":"2022-01-21T08:00:32","date_gmt":"2022-01-21T08:00:32","guid":{"rendered":"http:\/\/www.alalloycasting.com\/?p=12441"},"modified":"2022-01-21T08:00:32","modified_gmt":"2022-01-21T08:00:32","slug":"%d1%80%d0%be%d1%82%d0%b0%d1%86%d0%b8%d0%be%d0%bd%d0%bd%d0%b0%d1%8f-%d0%b4%d0%b5%d0%b3%d0%b0%d0%b7%d0%b0%d1%86%d0%b8%d0%be%d0%bd%d0%bd%d0%b0%d1%8f-%d0%bc%d0%b0%d1%88%d0%b8%d0%bd%d0%b0","status":"publish","type":"post","link":"https:\/\/www.alalloycasting.com\/pt\/%d1%80%d0%be%d1%82%d0%b0%d1%86%d0%b8%d0%be%d0%bd%d0%bd%d0%b0%d1%8f-%d0%b4%d0%b5%d0%b3%d0%b0%d0%b7%d0%b0%d1%86%d0%b8%d0%be%d0%bd%d0%bd%d0%b0%d1%8f-%d0%bc%d0%b0%d1%88%d0%b8%d0%bd%d0%b0\/","title":{"rendered":"M\u00e1quina rotativa de desgaseifica\u00e7\u00e3o"},"content":{"rendered":"

A m\u00e1quina de desgaseifica\u00e7\u00e3o rotativa utiliza tecnologia avan\u00e7ada de fus\u00e3o com alto teor de sil\u00edcio para garantir uma vida \u00fatil prolongada; o rotor de desgaseifica\u00e7\u00e3o, o revestimento protetor do aquecedor e o revestimento protetor do termopar utilizam tecnologia de fabrica\u00e7\u00e3o de cer\u00e2mica capaz de atender aos requisitos da produ\u00e7\u00e3o de alum\u00ednio de alta precis\u00e3o.<\/p>\n

A m\u00e1quina de desgaseifica\u00e7\u00e3o rotativa \u00e9 instalada entre o forno e o equipamento de fundi\u00e7\u00e3o. Ela \u00e9 utilizada para remover hidrog\u00eanio (H) e esc\u00f3rias do alum\u00ednio fundido. A instala\u00e7\u00e3o de desgaseifica\u00e7\u00e3o em linha desempenha uma dupla fun\u00e7\u00e3o: tratamento e aquecimento. Ela atende \u00e0 ind\u00fastria de purifica\u00e7\u00e3o de alum\u00ednio fundido com alta precis\u00e3o.<\/p>\n

Desgaseifica\u00e7\u00e3o do alum\u00ednio<\/a> baseia-se no princ\u00edpio da migra\u00e7\u00e3o do hidrog\u00eanio gasoso dissolvido de uma regi\u00e3o de alta concentra\u00e7\u00e3o (no metal fundido) para uma regi\u00e3o de baixa concentra\u00e7\u00e3o (no g\u00e1s inerte). O hidrog\u00eanio gasoso se dispersa no metal fundido, como se tivesse sido liberado em qualquer espa\u00e7o fechado. Ele manter\u00e1 uma concentra\u00e7\u00e3o constante em todo o metal fundido. O hidrog\u00eanio gasoso pode migrar no metal l\u00edquido quase t\u00e3o rapidamente quanto no ar. Portanto, n\u00e3o h\u00e1 necessidade de colocar cada on\u00e7a de metal em contato com o g\u00e1s inerte. A efic\u00e1cia da desgaseifica\u00e7\u00e3o do alum\u00ednio \u00e9 determinada por dois fatores: a velocidade de transporte atrav\u00e9s da interface metal\/g\u00e1s e a \u00e1rea total da superf\u00edcie dispon\u00edvel para o transporte.<\/p>\n

\"M\u00e1quina<\/p>\n

Na fundi\u00e7\u00e3o de sucata de alum\u00ednio, o processo de remo\u00e7\u00e3o do hidrog\u00eanio em excesso \u00e9 de grande import\u00e2ncia para a produ\u00e7\u00e3o de pe\u00e7as fundidas de alum\u00ednio de alta qualidade.
\nO hidrog\u00eanio \u00e9 introduzido pela umidade. O excesso de hidrog\u00eanio afeta negativamente as propriedades mec\u00e2nicas do alum\u00ednio acabado, causando porosidade e retra\u00e7\u00e3o geral. \u00c9 importante remover o excesso de hidrog\u00eanio durante o processo de fus\u00e3o e vazamento.<\/p>\n

Para remover o hidrog\u00eanio, pode-se utilizar a inje\u00e7\u00e3o de gases inertes, como arg\u00f4nio ou nitrog\u00eanio, no metal fundido. Quando as bolhas de g\u00e1s inerte sobem atrav\u00e9s do alum\u00ednio fundido, o hidrog\u00eanio se difunde para dentro delas e praticamente desaparece. Os sistemas tradicionais de desgaseifica\u00e7\u00e3o limitam a agita\u00e7\u00e3o, especialmente no fundo, onde s\u00e3o necess\u00e1rias velocidades mais altas, o que leva a maior turbul\u00eancia na superf\u00edcie. As bolhas s\u00e3o maiores e, para alcan\u00e7ar os resultados desejados, a desgaseifica\u00e7\u00e3o leva mais tempo. Nos fundidores, \u00e9 necess\u00e1rio um excelente corte e dispers\u00e3o das bolhas, um tempo de reten\u00e7\u00e3o mais prolongado das bolhas no metal, circula\u00e7\u00e3o completa do metal fundido, um rotor que n\u00e3o entupa e maior resist\u00eancia ao choque t\u00e9rmico. Al\u00e9m disso, eles prefeririam utilizar menos g\u00e1s inerte no processo.<\/p>\n

A m\u00e1quina rotativa de desgaseifica\u00e7\u00e3o da AdTech utiliza componentes de grafite, que s\u00e3o fundamentais para o sucesso do processamento do metal. O rotor de desgaseifica\u00e7\u00e3o proporciona um maior movimento do metal, expelindo-o para fora e puxando-o pela parte inferior para melhorar a circula\u00e7\u00e3o. O movimento rotativo exclusivo do cabe\u00e7ote do rotor rompe as bolhas, impedindo a ascens\u00e3o do g\u00e1s. O rotor, habilmente projetado, empurra o metal para fora e o puxa pela parte inferior, melhorando o fluxo e, assim, aumentando a \u00e1rea da superf\u00edcie de rea\u00e7\u00e3o. Ele opera em rota\u00e7\u00f5es mais baixas e elimina as \u00abzonas mortas\u00bb na massa fundida.<\/p>","protected":false},"excerpt":{"rendered":"

\u0420\u043e\u0442\u0430\u0446\u0438\u043e\u043d\u043d\u0430\u044f \u0434\u0435\u0433\u0430\u0437\u0430\u0446\u0438\u043e\u043d\u043d\u0430\u044f \u043c\u0430\u0448\u0438\u043d\u0430 \u0438\u0441\u043f\u043e\u043b\u044c\u0437\u0443\u0435\u0442 \u043f\u0435\u0440\u0435\u0434\u043e\u0432\u0443\u044e \u0442\u0435\u0445\u043d\u043e\u043b\u043e\u0433\u0438\u044e \u043f\u043b\u0430\u0432\u043b\u0435\u043d\u0438\u044f \u0441 \u0432\u044b\u0441\u043e\u043a\u0438\u043c \u0441\u043e\u0434\u0435\u0440\u0436\u0430\u043d\u0438\u0435\u043c \u043a\u0440\u0435\u043c\u043d\u0438\u044f, \u0447\u0442\u043e\u0431\u044b \u043e\u0431\u0435\u0441\u043f\u0435\u0447\u0438\u0442\u044c \u0434\u043b\u0438\u0442\u0435\u043b\u044c\u043d\u044b\u0439 \u0441\u0440\u043e\u043a \u0441\u043b\u0443\u0436\u0431\u044b, \u0440\u043e\u0442\u043e\u0440 \u0434\u0435\u0433\u0430\u0437\u0430\u0446\u0438\u0438, \u0437\u0430\u0449\u0438\u0442\u043d\u044b\u0439 \u0433\u0438\u043b\u044c\u0437\u0430 \u043d\u0430\u0433\u0440\u0435\u0432\u0430\u0442\u0435\u043b\u044f \u0438 \u0437\u0430\u0449\u0438\u0442\u043d\u0430\u044f \u0433\u0438\u043b\u044c\u0437\u0430 \u0442\u0435\u0440\u043c\u043e\u043f\u0430\u0440\u044b…<\/p>","protected":false},"author":1,"featured_media":12442,"comment_status":"closed","ping_status":"closed","sticky":false,"template":"","format":"standard","meta":{"footnotes":""},"categories":[233],"tags":[13211,13212],"class_list":["post-12441","post","type-post","status-publish","format-standard","has-post-thumbnail","hentry","category-blog","tag-13211","tag-13212"],"yoast_head":"\n\u0420\u043e\u0442\u0430\u0446\u0438\u043e\u043d\u043d\u0430\u044f \u0434\u0435\u0433\u0430\u0437\u0430\u0446\u0438\u043e\u043d\u043d\u0430\u044f \u043c\u0430\u0448\u0438\u043d\u0430, \u0421\u0438\u0441\u0442\u0435\u043c\u0430 \u0434\u0435\u0433\u0430\u0437\u0430\u0446\u0438\u0438<\/title>\n<meta name=\"description\" content=\"\u0420\u043e\u0442\u0430\u0446\u0438\u043e\u043d\u043d\u0430\u044f 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