{"id":4985,"date":"2020-09-24T06:36:46","date_gmt":"2020-09-24T06:36:46","guid":{"rendered":"http:\/\/www.alalloycasting.com\/?p=4985"},"modified":"2020-09-24T06:43:12","modified_gmt":"2020-09-24T06:43:12","slug":"bright-bars","status":"publish","type":"post","link":"https:\/\/www.alalloycasting.com\/pt\/bright-bars\/","title":{"rendered":"Barras Brilhantes"},"content":{"rendered":"

As barras brilhantes s\u00e3o causadas principalmente por impurezas met\u00e1licas e n\u00e3o met\u00e1licas que s\u00e3o levadas para o bico e permanecem na parte frontal do bico durante a forma\u00e7\u00e3o da placa vertical, ou durante o processo de produ\u00e7\u00e3o devido \u00e0 baixa temperatura da caixa de entrada, ao baixo n\u00edvel de l\u00edquido no canal de vazamento, e a baixa velocidade de escoamento da esc\u00f3ria; o alum\u00ednio fundido, ao ser vertido, solidifica na borda frontal da boca do bico, causando um bloqueio local que impede o fluxo normal do alum\u00ednio fundido.<\/p>\n

Uma vez que uma faixa brilhante apare\u00e7a em algum ponto durante o processo de fundi\u00e7\u00e3o-lamina\u00e7\u00e3o, ela continuar\u00e1 at\u00e9 o final do processo, sem interrup\u00e7\u00e3o no meio, e sua posi\u00e7\u00e3o n\u00e3o se altera. N\u00e3o \u00e9 dif\u00edcil identificar as faixas brilhantes causadas por bloqueio durante a produ\u00e7\u00e3o, e listras sim\u00e9tricas ser\u00e3o formadas nas superf\u00edcies superior e inferior da tira. A forma\u00e7\u00e3o de faixas brilhantes e de segrega\u00e7\u00e3o na superf\u00edcie da chapa ocorre exatamente pelo contr\u00e1rio. Como o alum\u00ednio l\u00edquido fica bloqueado e se solidifica na parte frontal do bico, o que impede o fluxo normal do alum\u00ednio fundido, o material fundido em ambos os lados acaba entrando em contato com os rolos e n\u00e3o consegue formar os gr\u00e3os equiaxiais finos na superf\u00edcie. Ap\u00f3s a grava\u00e7\u00e3o com \u00e1cido de alta concentra\u00e7\u00e3o, pode-se observar que os gr\u00e3os locais est\u00e3o alinhados. Esse tipo de defeito em forma de estrias n\u00e3o pode ser eliminado no processamento subsequente de lamina\u00e7\u00e3o a frio. Isso s\u00f3 pode ser feito aumentando a temperatura da caixa dianteira e o n\u00edvel do l\u00edquido na calha na fase inicial da forma\u00e7\u00e3o das estrias. Medidas como a velocidade de lamina\u00e7\u00e3o para eliminar o bloqueio.<\/p>\n

\"\"<\/p>\n

Medidas de tratamento da Bright Bars<\/strong><\/p>\n

(1) A caixa frontal e o bocal de fundi\u00e7\u00e3o<\/a> A placa do ventilador deve estar totalmente seca quando estiver em uso. O bico fundido deve ser colocado em um forno por 30 minutos ou aquecido a 150 \u00b0C no forno por mais de 1 hora antes de ser colocado na prateleira. Antes da descarga, utilize a pistola de pulveriza\u00e7\u00e3o de g\u00e1s liquefeito (g\u00e1s natural) para aquecer por cerca de 1 minuto, a fim de evitar que o bico exploda e cause entupimento.<\/p>\n

(2) Controle a temperatura da caixa de alimenta\u00e7\u00e3o, o n\u00edvel de l\u00edquido do canal de alimenta\u00e7\u00e3o e a altura do n\u00edvel de l\u00edquido na caixa de alimenta\u00e7\u00e3o, bem como a velocidade da fita de vazamento e lamina\u00e7\u00e3o. Se forem observadas estrias quando a temperatura da caixa de entrada estiver baixa, deve-se primeiro aumentar a temperatura da caixa de entrada; em seguida, ajustar a velocidade da faixa de fundi\u00e7\u00e3o e lamina\u00e7\u00e3o; e, por fim, ajustar o n\u00edvel do l\u00edquido.<\/p>\n

(3) Adotar medidas de filtragem, selecionar os adequados filtro de espuma cer\u00e2mica<\/a> (de acordo com diferentes tecnologias de liga) e filtrar as inclus\u00f5es s\u00f3lidas em suspens\u00e3o na massa fundida.<\/p>\n

(4) Limpe a caixa frontal e a base, o tubo de alimenta\u00e7\u00e3o, o canal de vazamento etc. quando a m\u00e1quina estiver parada, a fim de evitar que impurezas met\u00e1licas e n\u00e3o met\u00e1licas sejam levadas para o bico de fundi\u00e7\u00e3o durante a montagem da placa.<\/p>\n

(5) Assegure a pureza do g\u00e1s de refino. Caso se constate que o alum\u00ednio l\u00edquido est\u00e1 viscoso, mude para a fonte alternativa de g\u00e1s a tempo de evitar comprometer a qualidade da massa fundida.<\/p>","protected":false},"excerpt":{"rendered":"

The bright bars are mainly caused by metal and non-metal impurities brought into the nozzle and stayed in the front of the nozzle during the…<\/p>","protected":false},"author":1,"featured_media":5036,"comment_status":"closed","ping_status":"closed","sticky":false,"template":"","format":"standard","meta":{"footnotes":""},"categories":[233],"tags":[],"class_list":["post-4985","post","type-post","status-publish","format-standard","has-post-thumbnail","hentry","category-blog"],"yoast_head":"\nBright Bars Treatment Measures by Controlling Aluminum Liquid<\/title>\n<meta name=\"description\" content=\"The bright bars are mainly caused by metal and non-metal impurities brought into the nozzle and stayed in the front of the nozzle.\" \/>\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\/bright-bars\/\" \/>\n<meta property=\"og:locale\" content=\"pt_BR\" 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