{"id":6118,"date":"2020-10-29T09:08:22","date_gmt":"2020-10-29T09:08:22","guid":{"rendered":"http:\/\/www.alalloycasting.com\/?p=6118"},"modified":"2020-10-29T09:08:22","modified_gmt":"2020-10-29T09:08:22","slug":"casting-nozzle-roll-gap","status":"publish","type":"post","link":"https:\/\/www.alalloycasting.com\/pt\/casting-nozzle-roll-gap\/","title":{"rendered":"Folga do rolo do bico de fundi\u00e7\u00e3o"},"content":{"rendered":"

A dimens\u00e3o da abertura entre os rolos do bocal de fundi\u00e7\u00e3o tem grande impacto na qualidade da tira laminada a quente. No processo de ajuste da abertura entre os rolos do bocal de fundi\u00e7\u00e3o, devem-se levar em considera\u00e7\u00e3o a expans\u00e3o t\u00e9rmica do pr\u00f3prio bocal, a expans\u00e3o quando preenchido com alum\u00ednio fundido, o raio de curvatura da pel\u00edcula de \u00f3xido e fatores relacionados \u00e0 fus\u00e3o, como a tens\u00e3o superficial do metal.<\/p>\n

Quando a folga entre os rolos do bico \u00e9 muito pequena, a dist\u00e2ncia entre o rolo de fundi\u00e7\u00e3o e o ponta do rod\u00edzio<\/a> est\u00e1 muito pr\u00f3ximo, e \u00e9 f\u00e1cil que se forme esc\u00f3ria no bico, de modo que a esc\u00f3ria de alum\u00ednio forma uma pequena fita de alum\u00ednio irregular e pegajosa na superf\u00edcie do rolo na dire\u00e7\u00e3o circunferencial, e a superf\u00edcie da tira apresenta linhas irregulares correspondentes ao longo de seu comprimento; essas s\u00e3o as listras longitudinais.<\/p>\n

Quando a folga do bico \u00e9 muito grande, a pel\u00edcula de \u00f3xido se rompe, e o \u00f3xido residual adere ao rolo e \u00e9 levado para a folga entre os rolos do bico, de modo que a pel\u00edcula de \u00f3xido fica presa nessa folga, causando uma microcompress\u00e3o local no bico de fundi\u00e7\u00e3o nesse ponto, o que resulta em uma distribui\u00e7\u00e3o n\u00e3o homog\u00eanea da massa fundida e na forma\u00e7\u00e3o de esc\u00f3ria pegajosa, de modo que a taxa de solidifica\u00e7\u00e3o da superf\u00edcie da tira sofrer\u00e1 varia\u00e7\u00f5es peri\u00f3dicas, o espa\u00e7amento entre as dendrites tamb\u00e9m sofrer\u00e1 varia\u00e7\u00f5es peri\u00f3dicas e surgir\u00e3o listras longitudinais. Portanto, o ajuste adequado da folga do bico desempenha um papel fundamental na qualidade do produto.<\/p>\n

\"Folga<\/p>\n

O alum\u00ednio fundido forma uma fina pel\u00edcula de \u00f3xido no ponto de contato do bico. A pel\u00edcula de \u00f3xido tem formato de arco. Como a superf\u00edcie do l\u00edquido \u00e9 curva e aberta, a tens\u00e3o superficial do l\u00edquido exerce uma certa for\u00e7a sobre o metal l\u00edquido, garantindo que ele n\u00e3o vaze pela abertura entre os rolos do bico. Da mesma forma, o metal fundido exerce uma for\u00e7a de rea\u00e7\u00e3o sobre a pel\u00edcula de \u00f3xido, que corresponde \u00e0 press\u00e3o est\u00e1tica da superf\u00edcie do l\u00edquido do tanque dianteiro, atuando sobre a superf\u00edcie do l\u00edquido por meio da transfer\u00eancia do l\u00edquido. Sob a intera\u00e7\u00e3o entre a tens\u00e3o superficial da pel\u00edcula de \u00f3xido e a press\u00e3o est\u00e1tica do metal l\u00edquido no tanque dianteiro, o processo de fundi\u00e7\u00e3o-lamina\u00e7\u00e3o atinge o equil\u00edbrio.<\/p>","protected":false},"excerpt":{"rendered":"

The size of the casting nozzle roll gap has a great impact on the quality of the cast-rolled strip product. In the process of adjusting…<\/p>","protected":false},"author":1,"featured_media":6120,"comment_status":"closed","ping_status":"closed","sticky":false,"template":"","format":"standard","meta":{"footnotes":""},"categories":[233],"tags":[],"class_list":["post-6118","post","type-post","status-publish","format-standard","has-post-thumbnail","hentry","category-blog"],"yoast_head":"\nCasting Nozzle Roll Gap Affects Cst-rolled Strip Product<\/title>\n<meta name=\"description\" content=\"The size of the aluminum silicate ceramic casting nozzle roll gap has a great impact on the quality of the cast-rolled strip product.\" \/>\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\/casting-nozzle-roll-gap\/\" \/>\n<meta property=\"og:locale\" content=\"pt_BR\" \/>\n<meta property=\"og:type\" content=\"article\" \/>\n<meta property=\"og:title\" content=\"Casting Nozzle 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