{"id":1943,"date":"2020-05-18T10:17:55","date_gmt":"2020-05-18T10:17:55","guid":{"rendered":"http:\/\/alalloycasting.com\/?p=1943"},"modified":"2020-08-31T06:38:09","modified_gmt":"2020-08-31T06:38:09","slug":"aluminum-alloy-casting-process","status":"publish","type":"post","link":"https:\/\/www.alalloycasting.com\/pt\/aluminum-alloy-casting-process\/","title":{"rendered":"Processo de fundi\u00e7\u00e3o de liga de alum\u00ednio"},"content":{"rendered":"

Os par\u00e2metros do processo de fundi\u00e7\u00e3o de ligas de alum\u00ednio incluem, principalmente, a temperatura de fundi\u00e7\u00e3o, a velocidade de fundi\u00e7\u00e3o e a intensidade de resfriamento, seguidos pela altura do n\u00edvel do l\u00edquido, acess\u00f3rios de fundi\u00e7\u00e3o do tipo \u201chot top\u201d, etc. A AdTech \u00e9 especializada em fundi\u00e7\u00f5es de ligas de alum\u00ednio, fornecendo equipamentos de purifica\u00e7\u00e3o e acess\u00f3rios de fundi\u00e7\u00e3o do tipo \u201chot top\u201d para resolver os problemas dessas empresas.<\/p>\n

Processo de fundi\u00e7\u00e3o de liga de alum\u00ednio<\/h2>\n

Temperatura de fundi\u00e7\u00e3o<\/strong><\/p>\n

Atualmente, a maior parte do processo de fundi\u00e7\u00e3o de ligas de alum\u00ednio j\u00e1 \u00e9 aplicada sistema de desgaseifica\u00e7\u00e3o online<\/a> e dispositivos de filtragem. A pr\u00e1tica tem demonstrado que diferentes temperaturas do l\u00edquido no dispositivo de desgaseifica\u00e7\u00e3o em linha produzem efeitos de desgaseifica\u00e7\u00e3o distintos. Portanto, \u00e9 necess\u00e1rio levar em considera\u00e7\u00e3o os requisitos de temperatura do l\u00edquido para o efeito de desgaseifica\u00e7\u00e3o do dispositivo de desgaseifica\u00e7\u00e3o em linha. Al\u00e9m disso, a evolu\u00e7\u00e3o de g\u00e1s do l\u00edquido no cristalizador tamb\u00e9m deve ser considerada. Devido \u00e0 baixa temperatura de fundi\u00e7\u00e3o, o g\u00e1s no cristalizador demora a flutuar para fora da superf\u00edcie do l\u00edquido, causando porosidade e fragilidade, e tamb\u00e9m pode causar defeitos de qualidade, como esc\u00f3ria e isolamento a frio. A temperatura de fundi\u00e7\u00e3o elevada n\u00e3o deve exceder a temperatura de fus\u00e3o. Uma temperatura de fundi\u00e7\u00e3o muito alta causar\u00e1 vazamento de alum\u00ednio no in\u00edcio da fundi\u00e7\u00e3o. Como o comprimento da ferramenta de transfer\u00eancia varia e a queda de temperatura do l\u00edquido \u00e9 diferente, h\u00e1 um ponto de aquecimento na linha, e a temperatura do l\u00edquido oscila bastante durante o processo de transfer\u00eancia. Portanto, a temperatura de fundi\u00e7\u00e3o deve referir-se \u00e0 temperatura do l\u00edquido injetado no cristalizador. Geralmente, a temperatura de fundi\u00e7\u00e3o \u00e9 de 50 \u00b0C a 70 \u00b0C mais alta do que a temperatura real de cristaliza\u00e7\u00e3o da liga. A zona de transi\u00e7\u00e3o das ligas de alum\u00ednio das s\u00e9ries 1xxx e 3xxx na m\u00e1quina de fundi\u00e7\u00e3o \u00e9 estreita, e a temperatura de fundi\u00e7\u00e3o deve ser alta. A zona de transi\u00e7\u00e3o das ligas das s\u00e9ries 2xxx e 7xxx \u00e9 mais ampla. A temperatura de fundi\u00e7\u00e3o deve ser mais baixa.<\/p>\n

\"Processo<\/p>\n

Velocidade de lan\u00e7amento<\/strong><\/p>\n

Na fundi\u00e7\u00e3o cont\u00ednua, o comprimento do lingote formado por unidade de tempo \u00e9 denominado velocidade de fundi\u00e7\u00e3o. A fundi\u00e7\u00e3o tradicional geralmente consiste em uma ordem de fundi\u00e7\u00e3o com velocidade fixa. A fundi\u00e7\u00e3o moderna utiliza uma velocidade de fundi\u00e7\u00e3o vari\u00e1vel, ou seja, a velocidade no in\u00edcio da fundi\u00e7\u00e3o e durante o processo n\u00e3o s\u00e3o as mesmas. As varia\u00e7\u00f5es na velocidade de fundi\u00e7\u00e3o (r\u00e1pida e lenta) t\u00eam grande influ\u00eancia nas fissuras do lingote, na qualidade da superf\u00edcie, na estrutura e no desempenho do lingote. Com o objetivo de garantir a qualidade do lingote, deve-se utilizar uma alta velocidade de fundi\u00e7\u00e3o. O m\u00e9todo moderno de fundi\u00e7\u00e3o adota a velocidade de fundi\u00e7\u00e3o em curva, que substitui o antigo processo de fundi\u00e7\u00e3o com atingimento de temperatura m\u00ednima ou de t\u00eampera. Isso n\u00e3o apenas reduz algumas instala\u00e7\u00f5es auxiliares, mas tamb\u00e9m economiza m\u00e3o de obra e diminui a intensidade do trabalho, al\u00e9m de evitar alguns defeitos de qualidade na superf\u00edcie da pe\u00e7a fundida. A escolha da velocidade de fundi\u00e7\u00e3o. Geralmente, para ligas e lingotes com maior tend\u00eancia a rachaduras a frio, deve-se aumentar a velocidade de fundi\u00e7\u00e3o. Para ligas e lingotes com grande tend\u00eancia a rachaduras t\u00e9rmicas, a velocidade de fundi\u00e7\u00e3o deve ser reduzida.<\/p>\n

Capacidade de resfriamento<\/strong><\/p>\n

A intensidade de resfriamento tamb\u00e9m \u00e9 chamada de taxa de resfriamento. A intensidade de resfriamento n\u00e3o afeta apenas as fissuras do lingote, mas tamb\u00e9m exerce uma influ\u00eancia maior sobre a estrutura do lingote. \u00c0 medida que a intensidade de resfriamento aumenta, a velocidade de cristaliza\u00e7\u00e3o do lingote aumenta, a estrutura intragranular fica mais refinada e a cavidade l\u00edquida do lingote se torna menos profunda. O tamanho da zona de transi\u00e7\u00e3o \u00e9 reduzido, o que melhora as condi\u00e7\u00f5es de compacta\u00e7\u00e3o do metal e reduz ou elimina defeitos como folga e porosidade no lingote. A densidade do lingote aumenta, e o tamanho do composto prim\u00e1rio pode ser refinado para reduzir o grau de segrega\u00e7\u00e3o regional.<\/p>\n

Com o desenvolvimento da tecnologia de fundi\u00e7\u00e3o, o cristalizador dos m\u00e9todos modernos de fundi\u00e7\u00e3o tornou-se integrado. Ao realizar a fundi\u00e7\u00e3o com um cristalizador antigo, o consumo de \u00e1gua de resfriamento \u00e9 elevado, o que inevitavelmente gera alguns defeitos de qualidade no lingote. J\u00e1 ao realizar a fundi\u00e7\u00e3o com um cristalizador moderno, o consumo de \u00e1gua de resfriamento \u00e9 reduzido. A pr\u00e1tica comprovou que esse consumo \u00e9 de apenas cerca de 70% do consumo de \u00e1gua do cristalizador antigo. Atualmente, a maioria dos pa\u00edses utiliza a fundi\u00e7\u00e3o com cristalizador de baixo volume de l\u00edquido, cujo objetivo \u00e9 aumentar a intensidade do resfriamento e reduzir ou eliminar o fen\u00f4meno de aquecimento da \u00e1rea do espa\u00e7o de ar ap\u00f3s o resfriamento prim\u00e1rio; assim, praticamente n\u00e3o h\u00e1 situa\u00e7\u00e3o de t\u00eampera por resfriamento secund\u00e1rio, e os lingotes de fundi\u00e7\u00e3o planos s\u00e3o geralmente produzidos.<\/p>\n

A exig\u00eancia de resist\u00eancia \u00e0 lavagem a frio em rela\u00e7\u00e3o \u00e0 temperatura da \u00e1gua de resfriamento n\u00e3o pode ser ignorada. Normalmente, a temperatura da \u00e1gua de resfriamento \u00e9 definida em 20, mas devido \u00e0s condi\u00e7\u00f5es clim\u00e1ticas regionais. As diferen\u00e7as nas condi\u00e7\u00f5es das instala\u00e7\u00f5es de abastecimento de \u00e1gua e na temperatura da planta t\u00eam causado grandes varia\u00e7\u00f5es, resultando em defeitos de qualidade nos lingotes, tanto regionais quanto sazonais. O moderno sistema de abastecimento de \u00e1gua do cristalizador possui a fun\u00e7\u00e3o de transforma\u00e7\u00e3o por pulsos ou em fases cruzadas, determinada pela programa\u00e7\u00e3o do processo, de modo que a intensidade do resfriamento pode ser definida como uma curva de acordo com as necessidades do processo de fundi\u00e7\u00e3o.<\/p>","protected":false},"excerpt":{"rendered":"

Aluminum alloy casting process parameters mainly include casting temperature, casting speed, cooling intensity, followed by liquid level height, hot top casting accessories, etc. AdTech specializes…<\/p>","protected":false},"author":1,"featured_media":4330,"comment_status":"closed","ping_status":"closed","sticky":false,"template":"","format":"standard","meta":{"footnotes":""},"categories":[138],"tags":[159,160],"class_list":["post-1943","post","type-post","status-publish","format-standard","has-post-thumbnail","hentry","category-seo","tag-aluminum-alloy-casting-process","tag-aluminum-casting"],"yoast_head":"\nAluminum Alloy Casting Process | Hot Top Casting<\/title>\n<meta name=\"description\" content=\"Aluminum alloy casting process parameters mainly include casting temperature, casting speed, cooling intensity, hot top casting accessories.\" \/>\n<meta name=\"robots\" content=\"index, follow, max-snippet:-1, max-image-preview:large, max-video-preview:-1\" \/>\n<link rel=\"canonical\" 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