{"id":2897,"date":"2020-07-17T03:12:19","date_gmt":"2020-07-17T03:12:19","guid":{"rendered":"http:\/\/www.alalloycasting.com\/?p=2897"},"modified":"2020-11-23T02:23:37","modified_gmt":"2020-11-23T02:23:37","slug":"pore-defects-in-aluminum-casting","status":"publish","type":"post","link":"https:\/\/www.alalloycasting.com\/pt\/pore-defects-in-aluminum-casting\/","title":{"rendered":"Defeitos por poros em pe\u00e7as fundidas de alum\u00ednio"},"content":{"rendered":"

As pe\u00e7as produzidas por fundi\u00e7\u00e3o sob press\u00e3o de liga de alum\u00ednio s\u00e3o frequentemente descartadas devido \u00e0 presen\u00e7a de poros. Existem muitas raz\u00f5es para a ocorr\u00eancia de defeitos porosos na fundi\u00e7\u00e3o de alum\u00ednio. Ao resolver esse problema de qualidade do produto, muitas vezes \u00e9 dif\u00edcil saber por onde come\u00e7ar. Na produ\u00e7\u00e3o de fundi\u00e7\u00e3o de ligas de alum\u00ednio, os defeitos de poros s\u00e3o comuns e constituem um dos defeitos que causam perdas relativamente grandes \u00e0s fundi\u00e7\u00f5es de ligas de alum\u00ednio. Os poros s\u00e3o causados principalmente pelo g\u00e1s presente no alum\u00ednio fundido. Como tomar medidas de forma r\u00e1pida e correta para reduzir a taxa de refugo causada pelos poros? Essa \u00e9 uma quest\u00e3o que preocupa os fabricantes de fundi\u00e7\u00e3o sob press\u00e3o de ligas de alum\u00ednio.<\/p>\n

Na produ\u00e7\u00e3o de pe\u00e7as fundidas sob press\u00e3o de liga de alum\u00ednio, h\u00e1 diversos motivos pelos quais o produto pode apresentar porosidade, e o problema deve ser resolvido identificando-se a causa e tratando o problema na raiz.<\/p>\n

\"Defeitos<\/p>\n

Medidas para prevenir defeitos de poros na fundi\u00e7\u00e3o de alum\u00ednio<\/h2>\n

(1) Garantir a qualidade do desgaseamento refinado na fus\u00e3o de ligas de alum\u00ednio. Escolher bons agente refinador<\/a> e unidade de desgaseifica\u00e7\u00e3o<\/a> para reduzir o teor de g\u00e1s no alum\u00ednio l\u00edquido e remover a esc\u00f3ria e o \u00f3xido da superf\u00edcie do l\u00edquido em tempo h\u00e1bil, a fim de evitar que o g\u00e1s seja levado novamente para a moldagem sob press\u00e3o.<\/p>\n

(2) Escolha um bom agente desmoldante. O agente desmoldante escolhido n\u00e3o deve gerar g\u00e1s durante a fundi\u00e7\u00e3o sob press\u00e3o e deve apresentar bom desempenho na remo\u00e7\u00e3o do molde.<\/p>\n

(3) Certifique-se de que a exaust\u00e3o do molde esteja desobstru\u00edda e que o escoamento seja suave, e que o g\u00e1s no molde seja totalmente descarregado; em especial, o canal de exaust\u00e3o deve estar desobstru\u00eddo no ponto final de polimeriza\u00e7\u00e3o do alum\u00ednio l\u00edquido.<\/p>\n

(4) Ajuste os par\u00e2metros de fundi\u00e7\u00e3o sob press\u00e3o; a velocidade de enchimento n\u00e3o deve ser muito alta para evitar a forma\u00e7\u00e3o de g\u00e1s. A temperatura de fundi\u00e7\u00e3o tamb\u00e9m deve ser bem controlada.<\/p>\n

(5) Deve-se prestar aten\u00e7\u00e3o ao uso da extra\u00e7\u00e3o do n\u00facleo e do resfriamento no projeto do produto e do molde, a fim de minimizar diferen\u00e7as excessivas na espessura das paredes.<\/p>\n

(6) Os orif\u00edcios de ventila\u00e7\u00e3o que costumam aparecer nas pe\u00e7as fixas devem ser aprimorados no molde e no projeto.<\/p>","protected":false},"excerpt":{"rendered":"

The workpieces produced by aluminum alloy die casting are often scrapped due to the existence of pores. There are many reasons for the occurrence of…<\/p>","protected":false},"author":1,"featured_media":5604,"comment_status":"closed","ping_status":"closed","sticky":false,"template":"","format":"standard","meta":{"footnotes":""},"categories":[233],"tags":[1462,1463],"class_list":["post-2897","post","type-post","status-publish","format-standard","has-post-thumbnail","hentry","category-blog","tag-pore-defects-in-aluminum-casting","tag-refining-and-degassing"],"yoast_head":"\nPore Defects in Aluminum Casting | Refining and Degassing<\/title>\n<meta name=\"description\" content=\"How to take measures to reduce the scrap rate caused by the pore defects in aluminum casting. This is issues concerned by foundry.\" \/>\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\/pore-defects-in-aluminum-casting\/\" \/>\n<meta property=\"og:locale\" content=\"pt_BR\" \/>\n<meta property=\"og:type\" content=\"article\" \/>\n<meta property=\"og:title\" content=\"Pore Defects in Aluminum Casting | Refining and Degassing\" \/>\n<meta property=\"og:description\" content=\"How to take measures to reduce the scrap rate caused by the pore defects in aluminum casting. 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