{"id":7190,"date":"2020-12-24T06:39:33","date_gmt":"2020-12-24T06:39:33","guid":{"rendered":"http:\/\/www.alalloycasting.com\/?p=7190"},"modified":"2020-12-24T06:40:06","modified_gmt":"2020-12-24T06:40:06","slug":"ceramic-filter-for-metal-casting","status":"publish","type":"post","link":"https:\/\/www.alalloycasting.com\/pt\/ceramic-filter-for-metal-casting\/","title":{"rendered":"Filtro cer\u00e2mico para fundi\u00e7\u00e3o de metais"},"content":{"rendered":"<p>S\u00e3o analisados os defeitos de fundi\u00e7\u00e3o das pe\u00e7as fundidas de carca\u00e7a de alum\u00ednio dos compressores do turbocompressor de motores a gasolina. S\u00e3o analisadas as poss\u00edveis causas desses defeitos. Ap\u00f3s a an\u00e1lise da qualidade do metal fundido, s\u00e3o apresentadas as raz\u00f5es para o uso de filtros de espuma cer\u00e2mica para melhorar o processo de fundi\u00e7\u00e3o, o que foi comprovado na produ\u00e7\u00e3o real. Com o uso do filtro cer\u00e2mico na fundi\u00e7\u00e3o de metais, a taxa de rejei\u00e7\u00e3o \u00e9 significativamente reduzida, diminuindo efetivamente o custo de produ\u00e7\u00e3o.<\/p>\n<p>A carca\u00e7a de alum\u00ednio do compressor do turbocompressor \u00e9 fabricada por fundi\u00e7\u00e3o por gravidade em molde met\u00e1lico, e o n\u00facleo de areia \u00e9 do tipo revestido. Devido \u00e0 r\u00e1pida queda de temperatura durante o processo de enchimento com alum\u00ednio fundido na fundi\u00e7\u00e3o em molde met\u00e1lico, \u00e9 necess\u00e1rio um enchimento r\u00e1pido. A temperatura de vazamento \u00e9 de 710 \u00b0C, a temperatura de pr\u00e9-aquecimento do molde \u00e9 de 300 a 350 \u00b0C, o tempo de enchimento \u00e9 de cerca de 6 s, e duas camadas de telas filtrantes de fibra s\u00e3o colocadas na raiz do canal de alimenta\u00e7\u00e3o.<\/p>\n<p>Na produ\u00e7\u00e3o real, surge um grande n\u00famero de defeitos, como inclus\u00f5es e arrastamentos, nas pe\u00e7as fundidas. Em casos graves, as inclus\u00f5es de oxida\u00e7\u00e3o bloqueiam a se\u00e7\u00e3o do produto, e os defeitos penetrantes formados causam graves vazamentos de ar. Ap\u00f3s o tratamento de jateamento de superf\u00edcie, surgem orif\u00edcios, e, na se\u00e7\u00e3o de fratura, podem ser observados \u00f3xidos em toda a espessura da parede.<\/p>\n<p>A fim de analisar mais detalhadamente os tipos de defeitos e as causas de sua forma\u00e7\u00e3o, foram coletadas amostras dos defeitos das pe\u00e7as fundidas para observa\u00e7\u00e3o metalogr\u00e1fica, tendo-se constatado a presen\u00e7a de defeitos como inclus\u00f5es de \u00f3xido, poros e retra\u00e7\u00e3o. Os defeitos mencionados acima podem, geralmente, ser causados por um tratamento inadequado do alum\u00ednio l\u00edquido, pela falha em desgaseificar e remover esc\u00f3rias de forma eficaz, o que faz com que elas acabem entrando na pe\u00e7a fundida; ou ainda, o projeto inadequado do sistema de vazamento pode causar turbul\u00eancia e respingos durante o processo de vazamento.<\/p>\n<p><img loading=\"lazy\" decoding=\"async\" class=\"alignnone size-full wp-image-7066\" src=\"http:\/\/alalloycasting.com\/wp-content\/uploads\/2020\/12\/Molten-Aluminium-Degassing.jpg\" alt=\"Desgaseifica\u00e7\u00e3o do alum\u00ednio fundido\" width=\"500\" height=\"400\" srcset=\"https:\/\/www.alalloycasting.com\/wp-content\/uploads\/2020\/12\/Molten-Aluminium-Degassing.jpg 500w, https:\/\/www.alalloycasting.com\/wp-content\/uploads\/2020\/12\/Molten-Aluminium-Degassing-300x240.jpg 300w\" sizes=\"auto, (max-width: 500px) 100vw, 500px\" \/><\/p>\n<p>A an\u00e1lise do metal fundido envolve um tratamento de refino de nitrog\u00eanio no alum\u00ednio fundido. Ap\u00f3s o tratamento, o alum\u00ednio fundido \u00e9 testado por um detector de hidrog\u00eanio. O resultado mostra que o teor de H\u2082 em cada 100 g de Al \u00e9 de 0,15 ml. A amostra metalogr\u00e1fica tamb\u00e9m apresentou-se limpa e sem esc\u00f3ria. Portanto, conclui-se que os defeitos decorrentes de g\u00e1s, esc\u00f3ria e inclus\u00f5es n\u00e3o foram introduzidos na fundi\u00e7\u00e3o do alum\u00ednio fundido.<\/p>\n<p>Ap\u00f3s a an\u00e1lise da simula\u00e7\u00e3o num\u00e9rica ter eliminado a causa do rejeito de fundi\u00e7\u00e3o causado pelo alum\u00ednio fundido, o processo original foi simulado numericamente utilizando o software MAGMA. Os resultados da simula\u00e7\u00e3o mostram que o alum\u00ednio fundido se espalha diretamente sobre a parte superior da pe\u00e7a fundida ap\u00f3s passar pelo filtro para preencher essa \u00e1rea e, em seguida, escorre para baixo ap\u00f3s o preenchimento parcial. A velocidade \u00e9 alta, e a turbul\u00eancia, os respingos e o arrastamento s\u00e3o intensos.<\/p>\n<p>Os defeitos de fundi\u00e7\u00e3o s\u00e3o causados principalmente pela falta de um controle eficaz do processo de enchimento. Portanto, ajustar o sistema de vazamento para tornar o enchimento est\u00e1vel pode evitar defeitos de forma eficaz. O uso de um filtro de espuma cer\u00e2mica \u00e9 uma das maneiras simples e eficazes de se fazer isso. O filtro de espuma cer\u00e2mica substitui o filtro de fibra utilizado no processo original. O processo de enchimento fica est\u00e1vel, evitando turbul\u00eancias, arrastamento e respingos; al\u00e9m disso, o fundo \u00e9 preenchido primeiro, garantindo o enchimento adequado.<\/p>\n<p>O <a href=\"http:\/\/www.alalloycasting.com\/pt\/ceramic-foam-filter-china\/\">filtro de espuma cer\u00e2mica<\/a> Para a fundi\u00e7\u00e3o de metais, isso n\u00e3o s\u00f3 proporciona um bom efeito de filtragem no alum\u00ednio fundido, como tamb\u00e9m evita de forma eficaz a forma\u00e7\u00e3o de inclus\u00f5es oxidadas end\u00f3genas.<\/p>","protected":false},"excerpt":{"rendered":"<p>The casting defects of the aluminum shell castings of the gasoline engine turbocharger compressors are analyzed. The possible causes of these defects are analyzed. After&hellip;<\/p>","protected":false},"author":1,"featured_media":7191,"comment_status":"closed","ping_status":"closed","sticky":false,"template":"","format":"standard","meta":{"footnotes":""},"categories":[233],"tags":[],"class_list":["post-7190","post","type-post","status-publish","format-standard","has-post-thumbnail","hentry","category-blog"],"yoast_head":"<!-- This site is optimized with the Yoast SEO plugin v27.9 - https:\/\/yoast.com\/product\/yoast-seo-wordpress\/ -->\n<title>Ceramic Filter for Metal Casting -sales@alalloycasting.com<\/title>\n<meta name=\"description\" content=\"Ceramic foam filter for metal casting not only has a good filtering effect on molten aluminum, but also effectively avoids the inclusions.\" \/>\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\/pt\/ceramic-filter-for-metal-casting\/\" \/>\n<meta property=\"og:locale\" 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