{"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\/pt\/rotary-degassing-for-casting\/","title":{"rendered":"Desgaseamento rotativo para fundi\u00e7\u00e3o"},"content":{"rendered":"<p>\u00c0 medida que a demanda por pe\u00e7as fundidas de metais n\u00e3o ferrosos (especialmente pe\u00e7as fundidas de alum\u00ednio e ligas de alum\u00ednio) continua a crescer, a press\u00e3o sobre as fundi\u00e7\u00f5es para melhorar a qualidade das pe\u00e7as fundidas tamb\u00e9m est\u00e1 aumentando. Como as especifica\u00e7\u00f5es t\u00e9cnicas para a maioria das aplica\u00e7\u00f5es industriais, incluindo constru\u00e7\u00e3o, engenharia, transporte, aeroespacial e automotiva, cujo uso tem crescido rapidamente nos \u00faltimos anos. Para remover impurezas da massa fundida e obter um metal mais limpo e de melhor qualidade, um dos m\u00e9todos de limpeza mais comuns e eficazes utilizados pelas fundi\u00e7\u00f5es \u00e9 a desgaseifica\u00e7\u00e3o rotativa para fundi\u00e7\u00e3o.<\/p>\n<p>Existem dois tipos principais de impurezas encontradas no alum\u00ednio fundido: hidrog\u00eanio dissolvido e inclus\u00f5es s\u00f3lidas n\u00e3o met\u00e1licas.<\/p>\n<p>\u00c0 medida que o metal esfria, o hidrog\u00eanio dissolvido se liberta da solu\u00e7\u00e3o e forma poros prejudiciais. Essa porosidade e as inclus\u00f5es s\u00f3lidas n\u00e3o met\u00e1licas reduzem a resist\u00eancia e afetam negativamente o desempenho final das pe\u00e7as fundidas de alum\u00ednio.<\/p>\n<p>Essa rea\u00e7\u00e3o leva \u00e0 forma\u00e7\u00e3o de camadas de \u00f3xido na superf\u00edcie do metal fundido durante o processo de fus\u00e3o e a subsequente transfer\u00eancia do metal fundido. Os \u00f3xidos produzidos ficam retidos na maior parte do material fundido e, em seguida, s\u00e3o transferidos para a pe\u00e7a fundida final. Outras inclus\u00f5es n\u00e3o met\u00e1licas, como carbonetos, nitretos ou boretos, podem provir de fontes como os materiais dos cadinhos ou outros materiais refrat\u00e1rios.<\/p>\n<p>Quaisquer inclus\u00f5es que surgirem causar\u00e3o defeitos estruturais na pe\u00e7a fundida, o que afetar\u00e1 negativamente as propriedades mec\u00e2nicas, al\u00e9m de causar dificuldades no processamento e poder danificar a m\u00e1quina-ferramenta.<\/p>\n<p>Portanto, o hidrog\u00eanio dissolvido e as inclus\u00f5es n\u00e3o met\u00e1licas devem ser removidos do metal fundido antes da fundi\u00e7\u00e3o, a fim de se obter a melhor qualidade.<\/p>\n<p>\u00c0 medida que a demanda global por volume e qualidade das pe\u00e7as fundidas de alum\u00ednio aumenta, o setor se torna mais globalizado e a concorr\u00eancia entre as fundi\u00e7\u00f5es se torna cada vez mais acirrada. As fundi\u00e7\u00f5es devem adotar os processos mais eficientes e econ\u00f4micos para oferecer pe\u00e7as fundidas a pre\u00e7os competitivos.<\/p>\n<p><img loading=\"lazy\" decoding=\"async\" class=\"alignnone size-full wp-image-7291\" src=\"http:\/\/alalloycasting.com\/wp-content\/uploads\/2020\/12\/Degassing-for-Foundry.jpg\" alt=\"Desgaseifica\u00e7\u00e3o para fundi\u00e7\u00e3o\" width=\"500\" height=\"400\" srcset=\"https:\/\/www.alalloycasting.com\/wp-content\/uploads\/2020\/12\/Degassing-for-Foundry.jpg 500w, https:\/\/www.alalloycasting.com\/wp-content\/uploads\/2020\/12\/Degassing-for-Foundry-300x240.jpg 300w\" sizes=\"auto, (max-width: 500px) 100vw, 500px\" \/><\/p>\n<p>A desgaseifica\u00e7\u00e3o rotativa para fundi\u00e7\u00e3o \u00e9 utilizada para purificar o metal e envolve o processo f\u00edsico de uso de um fluxo de g\u00e1s inerte. Recomenda-se a desgaseifica\u00e7\u00e3o do alum\u00ednio com nitrog\u00eanio seco ou arg\u00f4nio. O hidrog\u00eanio dissolvido no material fundido se difunde nas bolhas ascendentes do g\u00e1s de fluxo e \u00e9 transportado para a superf\u00edcie do material fundido. O \u00f3xido e outras inclus\u00f5es n\u00e3o met\u00e1licas s\u00e3o removidos principalmente por flota\u00e7\u00e3o, pois pequenas bolhas inertes se ligam ao \u00f3xido e, em seguida, flutuam at\u00e9 a superf\u00edcie do banho. Os princ\u00edpios que se aplicam \u00e0 remo\u00e7\u00e3o de hidrog\u00eanio tamb\u00e9m se aplicam \u00e0 remo\u00e7\u00e3o de \u00f3xido.<\/p>\n<p>O princ\u00edpio de <a href=\"http:\/\/www.alalloycasting.com\/pt\/rotating-degassing\/\">desgaseamento rotativo<\/a> \u00e9 aumentar a \u00e1rea de superf\u00edcie do g\u00e1s de intercala\u00e7\u00e3o exposta ao metal. Quanto maior a \u00e1rea de superf\u00edcie, maior a taxa de transfer\u00eancia do metal para o g\u00e1s inerte. Para um determinado volume de g\u00e1s, quanto menor o tamanho da bolha, maior a \u00e1rea de superf\u00edcie. Por exemplo, uma bolha com di\u00e2metro de 1 polegada tem uma \u00e1rea de superf\u00edcie de 6 polegadas quadradas. Se a mesma bolha for dividida em bolhas com di\u00e2metro de 1\/16 de polegada, a \u00e1rea de superf\u00edcie aumentar\u00e1 para 96 polegadas quadradas. Bolhas menores causam menos interfer\u00eancia na superf\u00edcie do material fundido, reduzindo a absor\u00e7\u00e3o adicional de hidrog\u00eanio em ambientes \u00famidos.<\/p>","protected":false},"excerpt":{"rendered":"<p>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&hellip;<\/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":"<!-- This site is optimized with the Yoast SEO plugin v27.9 - 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