{"id":7935,"date":"2021-02-25T06:51:10","date_gmt":"2021-02-25T06:51:10","guid":{"rendered":"http:\/\/www.alalloycasting.com\/?p=7935"},"modified":"2021-02-25T06:51:10","modified_gmt":"2021-02-25T06:51:10","slug":"air-slip-casting","status":"publish","type":"post","link":"https:\/\/www.alalloycasting.com\/pt\/air-slip-casting\/","title":{"rendered":"Fundi\u00e7\u00e3o por deslizamento a ar"},"content":{"rendered":"

A fundi\u00e7\u00e3o pneum\u00e1tica e a fundi\u00e7\u00e3o por inje\u00e7\u00e3o de ar podem produzir lingotes de alta qualidade, representando m\u00e9todos avan\u00e7ados e contempor\u00e2neos de conforma\u00e7\u00e3o de lingotes. No entanto, esse m\u00e9todo de fundi\u00e7\u00e3o \u00e9 mais sens\u00edvel a varia\u00e7\u00f5es na press\u00e3o do ar, sendo necess\u00e1rio controlar essa press\u00e3o com precis\u00e3o, al\u00e9m de apresentar requisitos mais rigorosos quanto \u00e0 qualidade do g\u00e1s utilizado na fundi\u00e7\u00e3o. Quanto menor o teor de \u00e1gua, melhor. O anel de grafite poroso utilizado se desgasta rapidamente e \u00e9 caro. Al\u00e9m disso, a tecnologia de fundi\u00e7\u00e3o \u00e9 exigente e dif\u00edcil de dominar.<\/p>\n

A fundi\u00e7\u00e3o pneum\u00e1tica com topo quente consiste em fazer passar g\u00e1s a uma determinada press\u00e3o entre o tampa superior aquecida<\/a> e o cristalizador, e sua press\u00e3o est\u00e1 exatamente em equil\u00edbrio com a press\u00e3o est\u00e1tica da massa fundida naquele ponto, formando uma camada de ar entre a massa fundida e a parede do molde. A massa fundida conta com essa camada de ar para deslizar para baixo e se solidificar, reduzindo assim significativamente a condu\u00e7\u00e3o de calor por contato do molde (1 resfriamento), tornando a superf\u00edcie do lingote lisa, a camada resfriada mais superficial e melhorando tamb\u00e9m a estrutura cristalina interna.<\/p>\n

A diferen\u00e7a entre o hot top de deslizamento de ar e o hot top de press\u00e3o de ar \u00e9 que um anel de grafite microporoso est\u00e1 embutido no molde, e o \u00f3leo e o g\u00e1s penetram pela abertura do anel de grafite para formar uma camada de ar que permite que a massa fundida deslize para baixo, solidifique e assuma a forma desejada, o que permite a produ\u00e7\u00e3o de lingotes fundidos de alta qualidade.<\/p>\n

Vantagens da fundi\u00e7\u00e3o por deslizamento a ar<\/strong><\/p>\n

    \n
  1. A qualidade da superf\u00edcie do lingote \u00e9 excelente. \u00c0 medida que o resfriamento prim\u00e1rio \u00e9 enfraquecido e o resfriamento secund\u00e1rio \u00e9 refor\u00e7ado, a cavidade do l\u00edquido torna-se mais plana, o que basicamente elimina as condi\u00e7\u00f5es para a forma\u00e7\u00e3o de segrega\u00e7\u00f5es superficiais. Como ainda h\u00e1 uma camada quente na parte superior do lingote, a possibilidade de forma\u00e7\u00e3o de camadas \u00e9 bastante reduzida quando a velocidade de fundi\u00e7\u00e3o \u00e9 aumentada. Devido \u00e0 camada de lubrifica\u00e7\u00e3o de \u00f3leo\/g\u00e1s entre o inv\u00f3lucro do lingote e a parede do molde, a tend\u00eancia \u00e0 forma\u00e7\u00e3o de rachaduras e arranh\u00f5es superficiais tamb\u00e9m \u00e9 bastante reduzida. Portanto, a qualidade da superf\u00edcie dos lingotes fundidos por deslizamento a ar \u00e9 melhor do que a dos lingotes fundidos por topo quente.<\/li>\n
  2. A tend\u00eancia \u00e0 forma\u00e7\u00e3o de trincas no lingote \u00e9 reduzida. O formato mais plano da cavidade do l\u00edquido torna a distribui\u00e7\u00e3o da tens\u00e3o t\u00e9rmica mais uniforme, reduzindo assim a tend\u00eancia \u00e0 forma\u00e7\u00e3o de trincas no lingote. \u00c9 poss\u00edvel utilizar uma velocidade de fundi\u00e7\u00e3o mais alta, o que melhora a efici\u00eancia da produ\u00e7\u00e3o.<\/li>\n
  3. Os gr\u00e3os s\u00e3o mais finos e uniformes. Tanto uma maior resist\u00eancia ao resfriamento quanto uma velocidade de fundi\u00e7\u00e3o mais elevada aumentam a velocidade m\u00e9dia de cristaliza\u00e7\u00e3o do lingote. Portanto, a estrutura cristalina do lingote \u00e9 mais fina e uniforme, o que melhora o desempenho geral de todo o lingote.<\/li>\n
  4. A intensidade de m\u00e3o de obra \u00e9 baixa.<\/li>\n<\/ol>","protected":false},"excerpt":{"rendered":"

    Pneumatic and air slip casting can produce high-quality ingots, representing contemporary advanced ingot forming methods. However, this casting method is more sensitive to changes in…<\/p>","protected":false},"author":1,"featured_media":7936,"comment_status":"closed","ping_status":"closed","sticky":false,"template":"","format":"standard","meta":{"footnotes":""},"categories":[233],"tags":[],"class_list":["post-7935","post","type-post","status-publish","format-standard","has-post-thumbnail","hentry","category-blog"],"yoast_head":"\nAir slip Casting Technology | Pneumatic Hot Top Casting<\/title>\n<meta name=\"description\" content=\"Pneumatic and air slip casting can produce high-quality ingots, representing contemporary advanced ingot forming methods.\" \/>\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\/air-slip-casting\/\" \/>\n<meta property=\"og:locale\" content=\"pt_BR\" \/>\n<meta property=\"og:type\" content=\"article\" \/>\n<meta property=\"og:title\" 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