{"id":5942,"date":"2020-10-24T13:42:33","date_gmt":"2020-10-24T13:42:33","guid":{"rendered":"http:\/\/www.alalloycasting.com\/?p=5942"},"modified":"2020-10-24T13:42:33","modified_gmt":"2020-10-24T13:42:33","slug":"headbox-temperature","status":"publish","type":"post","link":"https:\/\/www.alalloycasting.com\/pt\/headbox-temperature\/","title":{"rendered":"Temperatura da caixa de entrada"},"content":{"rendered":"

Em condi\u00e7\u00f5es est\u00e1veis, quando a temperatura de fundi\u00e7\u00e3o e lamina\u00e7\u00e3o \u00e9 constante, a temperatura da caixa de entrada tamb\u00e9m permanece constante. Como a temperatura da massa fundida na caixa de entrada \u00e9 f\u00e1cil de medir, e a temperatura da massa fundida na caixa frontal<\/a> durante a fundi\u00e7\u00e3o e a lamina\u00e7\u00e3o normais \u00e9 muito pequena. Trata-se da temperatura de fundi\u00e7\u00e3o. Durante o processo de fundi\u00e7\u00e3o e lamina\u00e7\u00e3o, costuma-se utilizar termopares para monitorar a temperatura da massa fundida na caixa frontal, a fim de controlar a temperatura de fundi\u00e7\u00e3o, de modo que a temperatura da massa fundida na zona de fundi\u00e7\u00e3o-lamina\u00e7\u00e3o permane\u00e7a est\u00e1vel e a taxa de solidifica\u00e7\u00e3o seja constante durante o processo de fundi\u00e7\u00e3o-lamina\u00e7\u00e3o.<\/p>\n

A temperatura de fundi\u00e7\u00e3o e lamina\u00e7\u00e3o deve ser mantida est\u00e1vel na sele\u00e7\u00e3o da temperatura de fundi\u00e7\u00e3o e lamina\u00e7\u00e3o. \u00c9 preciso levar em considera\u00e7\u00e3o o fluxo da massa fundida desde o forno est\u00e1tico, passando pelo canal de temperatura da caixa de entrada e pelo dispositivo de refinamento at\u00e9 a caixa frontal lambda e, em seguida, pelo canal transversal (bocal de distribui\u00e7\u00e3o e alimenta\u00e7\u00e3o) at\u00e9 a zona de lamina\u00e7\u00e3o. A perda de calor em todo o processo da zona de lamina\u00e7\u00e3o deve ser considerada. Especialmente ao projetar uma nova linha de produ\u00e7\u00e3o de fundi\u00e7\u00e3o e lamina\u00e7\u00e3o, o comprimento e a queda de temperatura desde a abertura do forno est\u00e1tico at\u00e9 a caixa frontal devem ser considerados, e a perda de temperatura do metal durante o fluxo para a caixa frontal deve ser m\u00ednima. Al\u00e9m disso, considere tamb\u00e9m o desempenho do isolamento t\u00e9rmico do sistema de calhas, o clima e a temperatura ambiente da oficina.<\/p>\n

\"Temperatura
\nComo todos sabemos, quando a temperatura do material fundido no forno \u00e9 muito alta ou ocorre superaquecimento local, isso n\u00e3o s\u00f3 aumenta o consumo de energia, mas tamb\u00e9m torna os gr\u00e3os cristalinos mais grossos. A pr\u00e1tica comprovou que, uma vez que a temperatura do material fundido no forno esteja muito alta ou haja superaquecimento parcial, mesmo que a temperatura seja reduzida ao n\u00edvel normal, a influ\u00eancia da temperatura excessiva nos gr\u00e3os grosseiros n\u00e3o pode ser eliminada. Portanto, controlar a temperatura do material fundido no forno de fus\u00e3o e no forno de repouso tamb\u00e9m controla a temperatura da caixa de entrada, o que \u00e9 muito importante para estabilizar o processo de fundi\u00e7\u00e3o-lamina\u00e7\u00e3o e melhorar a qualidade da tira fundida e laminada.<\/p>\n

Temperaturas excessivamente altas de fundi\u00e7\u00e3o e lamina\u00e7\u00e3o tamb\u00e9m s\u00e3o a principal causa do aumento do teor de g\u00e1s e da forma\u00e7\u00e3o de trincas. Temperaturas excessivamente altas de fundi\u00e7\u00e3o e lamina\u00e7\u00e3o impedem que a tira seja bem formada ou reduzem sua qualidade; se a temperatura de fundi\u00e7\u00e3o for muito baixa, a massa fundida se solidificar\u00e1 na cavidade do bico. A pr\u00e1tica tem demonstrado que, desde que sejam atendidos os requisitos do processo de fundi\u00e7\u00e3o-lamina\u00e7\u00e3o, a temperatura ideal de fundi\u00e7\u00e3o-lamina\u00e7\u00e3o \u00e9, geralmente, de 685 a 710 \u2103. A baixa temperatura de fundi\u00e7\u00e3o-lamina\u00e7\u00e3o n\u00e3o s\u00f3 refina os gr\u00e3os cristalinos da tira fundida-laminada, como tamb\u00e9m permite obter uma velocidade de fundi\u00e7\u00e3o mais elevada, aumentando assim a produtividade.<\/p>","protected":false},"excerpt":{"rendered":"

Under stable conditions, when the casting-rolling temperature is constant, the headbox temperature is also constant. Because the melt temperature in the front box is easy…<\/p>","protected":false},"author":1,"featured_media":5954,"comment_status":"open","ping_status":"closed","sticky":false,"template":"","format":"standard","meta":{"footnotes":""},"categories":[233],"tags":[417,405],"class_list":["post-5942","post","type-post","status-publish","format-standard","has-post-thumbnail","hentry","category-blog","tag-foundry-filters","tag-silicon-carbide-foam-filter"],"yoast_head":"\nHeadbox Temperature in Aluminum Casting-Rolling Process<\/title>\n<meta name=\"description\" content=\"When the casting-rolling temperature is constant, the headbox temperature is also constant. 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