{"id":4987,"date":"2020-09-24T06:16:58","date_gmt":"2020-09-24T06:16:58","guid":{"rendered":"http:\/\/www.alalloycasting.com\/?p=4987"},"modified":"2020-09-24T06:16:58","modified_gmt":"2020-09-24T06:16:58","slug":"airway-streaks","status":"publish","type":"post","link":"https:\/\/www.alalloycasting.com\/pt\/airway-streaks\/","title":{"rendered":"Listras nas vias a\u00e9reas"},"content":{"rendered":"

As estrias nas vias de fundi\u00e7\u00e3o s\u00e3o causadas principalmente pelo teor excessivo de hidrog\u00eanio na massa fundida e pelo bloqueio da cavidade do bico por objetos estranhos. O bico de fundi\u00e7\u00e3o est\u00e1 relativamente \u00famido, a massa fundida permanece no forno de fus\u00e3o ou no forno de repouso por tempo excessivo, ou a temperatura do alum\u00ednio l\u00edquido est\u00e1 muito alta, o que faz com que o teor de hidrog\u00eanio aumente. Durante o processo de lamina\u00e7\u00e3o, o g\u00e1s presente na cavidade l\u00edquida destinada \u00e0 lamina\u00e7\u00e3o n\u00e3o se dispersa facilmente na faixa s\u00f3lida; o tarugo permanece sempre suspenso na cavidade l\u00edquida. Com o tempo, o g\u00e1s acumulado forma cada vez mais pequenas bolhas. Onde h\u00e1 bolhas, o fluxo do metal fundido \u00e9 prejudicado e o fornecimento cont\u00ednuo do metal fundido \u00e9 afetado, de modo que surge um canal branco na superf\u00edcie da tira.<\/p>\n

Al\u00e9m disso, se impurezas met\u00e1licas ou n\u00e3o met\u00e1licas permanecerem na cavidade do bico durante o processo de produ\u00e7\u00e3o da placa vertical, isso causar\u00e1 um bloqueio parcial e criar\u00e1 uma zona de baixa press\u00e3o. O g\u00e1s (principalmente hidrog\u00eanio) se concentrar\u00e1 nesse local e, gradualmente, formar\u00e1 um cone de g\u00e1s, impedindo o fluxo normal do alum\u00ednio fundido. Nesse momento, aumente a velocidade da tira e aumente adequadamente a temperatura da caixa dianteira e o n\u00edvel do l\u00edquido. Sob a a\u00e7\u00e3o da press\u00e3o est\u00e1tica, poros longos se formar\u00e3o em ambos os lados das tiras e se deslocar\u00e3o. Quando os dois \u201ccanais de ar\u201d se aproximam, parece haver uma atra\u00e7\u00e3o entre eles, fazendo com que se aproximem gradualmente e, por fim, se fundam em um \u00fanico, formando um tri\u00e2ngulo de ar na conflu\u00eancia e expondo um orif\u00edcio na superf\u00edcie; ou cole fita de papel e chapa de a\u00e7o na posi\u00e7\u00e3o correspondente da tira no rolo e, em seguida, gire o rolo. Na zona bif\u00e1sica, a camada dura superficial que forma o cone de g\u00e1s \u00e9 rompida, o g\u00e1s \u00e9 liberado e as faixas de passagem de ar desaparecem gradualmente.<\/p>\n

\"Listras<\/p>\n

Medidas de tratamento para estrias nas vias a\u00e9reas<\/strong><\/p>\n

(1) O material em folha para bico pode ser instalado e utilizado ap\u00f3s estar totalmente seco, o que reduz o tempo de prepara\u00e7\u00e3o da placa vertical para evitar a absor\u00e7\u00e3o de umidade.<\/p>\n

(2) Reduzir o tempo de perman\u00eancia do metal fundido no forno de fus\u00e3o e no forno de repouso; caso esse tempo exceda 4 horas, deve-se realizar um novo refinamento. Quando a temperatura estiver acima do valor normal ou o alum\u00ednio fundido permanecer por mais de 8 horas, ele deve ser modificado e submetido a uma nova pulveriza\u00e7\u00e3o para refino, a fim de reduzir o teor de hidrog\u00eanio do metal fundido.<\/p>\n

(3) Pegue filtro de espuma cer\u00e2mica<\/a> medidas de filtragem para remover as part\u00edculas s\u00f3lidas em suspens\u00e3o na massa fundida.<\/p>\n

(4) Limpe a caixa frontal e a base, o tubo de alimenta\u00e7\u00e3o e sistema de calhas de transfer\u00eancia de metal<\/a> ap\u00f3s a parada da m\u00e1quina, para evitar que impurezas met\u00e1licas e n\u00e3o met\u00e1licas sejam introduzidas no bocal de fundi\u00e7\u00e3o<\/a> quando a laje for montada.<\/p>\n

(5) Garantir a pureza, a press\u00e3o e a vaz\u00e3o do g\u00e1s refinado para evitar a contamina\u00e7\u00e3o da qualidade da massa fundida.<\/p>","protected":false},"excerpt":{"rendered":"

Airway streaks are mainly caused by too high melt hydrogen content and blocking of foreign objects in the nozzle cavity. The casting nozzle is relatively…<\/p>","protected":false},"author":1,"featured_media":5028,"comment_status":"closed","ping_status":"closed","sticky":false,"template":"","format":"standard","meta":{"footnotes":""},"categories":[233],"tags":[],"class_list":["post-4987","post","type-post","status-publish","format-standard","has-post-thumbnail","hentry","category-blog"],"yoast_head":"\nAirway Streaks Treatment by Degassing and Filtering<\/title>\n<meta name=\"description\" content=\"Airway streaks are mainly caused by too high melt hydrogen content and blocking of foreign objects in the nozzle cavity. 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