{"id":2453,"date":"2020-06-28T09:56:28","date_gmt":"2020-06-28T09:56:28","guid":{"rendered":"http:\/\/alalloycasting.com\/?p=2453"},"modified":"2020-09-28T06:15:54","modified_gmt":"2020-09-28T06:15:54","slug":"filtration-in-foundries","status":"publish","type":"post","link":"https:\/\/www.alalloycasting.com\/pt\/filtration-in-foundries\/","title":{"rendered":"Filtragem em fundi\u00e7\u00f5es"},"content":{"rendered":"

A filtra\u00e7\u00e3o de ligas de alum\u00ednio pode ser dividida em v\u00e1rias etapas, dependendo do tipo de tecnologia utilizada na produ\u00e7\u00e3o de pe\u00e7as fundidas ou do m\u00e9todo de prepara\u00e7\u00e3o do metal l\u00edquido. A fabrica\u00e7\u00e3o de ligas de alum\u00ednio atende aos requisitos de maior pureza do metal fundido, a fim de aumentar a qualidade do produto intermedi\u00e1rio fabricado para a produ\u00e7\u00e3o final (folhas, blocos, lingotes, barras, perfis, etc.). Assim, a filtra\u00e7\u00e3o nas fundi\u00e7\u00f5es contribui para uma menor taxa de rejei\u00e7\u00e3o na fabrica\u00e7\u00e3o do produto final e para sua maior qualidade.<\/p>\n

Filtragem de ligas de alum\u00ednio<\/h2>\n

A fundi\u00e7\u00e3o de metais \u00e9 realizada nessas instala\u00e7\u00f5es por meio de campanhas cont\u00ednuas ou descont\u00ednuas, com volumes da ordem de algumas toneladas at\u00e9 algumas centenas de toneladas; por isso, s\u00e3o utilizados filtros de grande \u00e1rea para a filtragem. Eles s\u00e3o instalados no sistema de distribui\u00e7\u00e3o do metal l\u00edquido. Recomendamos que os filtros sejam colocados dentro das caixas de filtragem de cer\u00e2mica, utilizando um arranjo horizontal ou vertical.<\/p>\n

\"Filtragem<\/p>\n

Filtro para alum\u00ednio fundido<\/h2>\n

O filtros de espuma cer\u00e2mica<\/a><\/strong> adaptados para carga t\u00e9rmica prolongada, podem ser utilizados para filtragem. Os filtros de alum\u00ednio fundido s\u00e3o normalmente utilizados nas dimens\u00f5es padronizadas indicadas em polegadas, com porosidade de 10 a 60 PPI (poros por polegada linear). O tamanho do filtro de espuma cer\u00e2mica depende de sua porosidade e \u00e9 selecionado de acordo com a capacidade de filtra\u00e7\u00e3o, o tempo de fundi\u00e7\u00e3o e a solu\u00e7\u00e3o de layout do caixa de filtragem<\/a><\/strong>. A escolha da porosidade do filtro para alum\u00ednio fundido \u00e9 determinada pela liga espec\u00edfica, pela temperatura da fundi\u00e7\u00e3o, pela contamina\u00e7\u00e3o do metal e pela qualidade exigida do produto final.<\/p>\n

Antes da fundi\u00e7\u00e3o propriamente dita, o filtro deve ser pr\u00e9-aquecido adequadamente para garantir seu funcionamento correto. Ap\u00f3s a conclus\u00e3o da campanha, o filtro pode ser reutilizado, caso a caixa de filtragem esteja equipada com aquecimento permanente. Se o metal se depositar no filtro de espuma cer\u00e2mica<\/a>, ele precisa ser substitu\u00eddo para a pr\u00f3xima campanha de fundi\u00e7\u00e3o.<\/p>\n

Filtragem em fundi\u00e7\u00f5es<\/h2>\n

A contamina\u00e7\u00e3o do metal fundido por \u00f3xidos duros, que causa problemas no acabamento das pe\u00e7as fundidas, \u00e9 a principal raz\u00e3o para a ado\u00e7\u00e3o da filtragem de fundi\u00e7\u00e3o nas fundi\u00e7\u00f5es. A elimina\u00e7\u00e3o de defeitos indesej\u00e1veis, como compacta\u00e7\u00e3o excessiva da pe\u00e7a fundida, porosidade (bolhas), baixa homogeneidade etc., que muitas vezes ocorrem apenas durante o pr\u00f3prio processo de fundi\u00e7\u00e3o, sob o impacto da turbul\u00eancia do metal l\u00edquido no molde, \u00e9 a segunda principal raz\u00e3o para a filtragem.<\/p>","protected":false},"excerpt":{"rendered":"

Aluminium alloy filtration can be broken down into several parts, depending on the type of the applied technology of cast production or on the method…<\/p>","protected":false},"author":1,"featured_media":5216,"comment_status":"closed","ping_status":"closed","sticky":false,"template":"","format":"standard","meta":{"footnotes":""},"categories":[233],"tags":[645,21,664,665],"class_list":["post-2453","post","type-post","status-publish","format-standard","has-post-thumbnail","hentry","category-blog","tag-aluminium-alloys-filtration","tag-ceramic-foam-filter","tag-filtration-in-foundries","tag-molten-aluminium-filter"],"yoast_head":"\nFiltration in Foundries,Aluminium Alloys Filtration,Molten Aluminium Filter<\/title>\n<meta name=\"description\" content=\"Molten metal pollution by oxides, causing problems with cast finishing, is the main reason for introduction of cast filtration in foundries.\" \/>\n<meta name=\"robots\" content=\"index, follow, max-snippet:-1, max-image-preview:large, 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