{"id":11688,"date":"2021-12-09T02:09:33","date_gmt":"2021-12-09T02:09:33","guid":{"rendered":"http:\/\/www.alalloycasting.com\/?p=11688"},"modified":"2021-12-09T02:09:33","modified_gmt":"2021-12-09T02:09:33","slug":"cast-rolling-nozzles","status":"publish","type":"post","link":"https:\/\/www.alalloycasting.com\/pt\/cast-rolling-nozzles\/","title":{"rendered":"Bicos de lamina\u00e7\u00e3o por fundi\u00e7\u00e3o"},"content":{"rendered":"

Os bicos de lamina\u00e7\u00e3o fundidos s\u00e3o calcinados em altas temperaturas e n\u00e3o cont\u00eam mat\u00e9ria org\u00e2nica. A taxa de retra\u00e7\u00e3o a 800 \u00b0C \u00e9 zero, e podem ser utilizados em diversas m\u00e1quinas de fundi\u00e7\u00e3o cont\u00ednua com rolos duplos. Os bicos de fundi\u00e7\u00e3o macios de fibra cer\u00e2mica, livres de esc\u00f3ria, s\u00e3o utilizados na produ\u00e7\u00e3o de chapas de alum\u00ednio e folhas de alum\u00ednio para materiais de embalagem farmac\u00eautica e aliment\u00edcia. O bico de fundi\u00e7\u00e3o r\u00edgido, fabricado com fibra cer\u00e2mica e enchimento importado, apresenta caracter\u00edsticas de alta resist\u00eancia, superf\u00edcie lisa e resist\u00eancia ao desgaste. \u00c9 adequado para a fundi\u00e7\u00e3o e lamina\u00e7\u00e3o de chapas de alum\u00ednio em alta velocidade.<\/p>\n

O bocal de fundi\u00e7\u00e3o<\/a>\u00a0\u00e9 fabricado com materiais de alta qualidade (sem silicato de s\u00f3dio), apresentando alum\u00ednio com boas propriedades antiaderentes, baixa condutividade t\u00e9rmica, boa estabilidade a altas temperaturas, densidade uniforme, superf\u00edcie lisa e dimens\u00f5es precisas.<\/p>\n

As sali\u00eancias em forma de faixa que aparecem ao longo da superf\u00edcie do produto de alum\u00ednio s\u00e3o defeitos superficiais do produto. Quando a sali\u00eancia est\u00e1 presente em apenas um lado do produto, trata-se de \u201corelhas\u201d unilaterais; quando est\u00e1 presente em ambos os lados, trata-se de \u201corelhas\u201d bilaterais. Algumas se estendem por todo o produto, mas tamb\u00e9m h\u00e1 sali\u00eancias parciais, intermitentes ou peri\u00f3dicas. As sali\u00eancias que aparecem na superf\u00edcie do produto devem ser removidas.<\/p>\n

\"\"<\/p>\n

Os bicos de lamina\u00e7\u00e3o fundidos causaram rachaduras nas orelhas porque, durante o processo de lamina\u00e7\u00e3o, o metal \u00e9 colocado em excesso no orif\u00edcio acabado, e esse excesso \u00e9 comprimido na abertura entre os rolos. As raz\u00f5es espec\u00edficas s\u00e3o as seguintes:<\/p>\n

(1) Projeto inadequado da passagem, ajuste incorreto do laminador ou desgaste acentuado do furo acabado, resultando em um grande n\u00famero de furos acabados e rebarbas em ambos os lados;
\n(2) O trilho-guia de entrada do furo acabado est\u00e1 instalado incorretamente, n\u00e3o est\u00e1 bem apertado, a folga \u00e9 muito grande ou o tipo do furo de entrada n\u00e3o \u00e9 prop\u00edcio \u00e0 forma\u00e7\u00e3o de sali\u00eancias unilaterais ou sali\u00eancias quebradas em ambos os lados;
\n(3) A temperatura da pe\u00e7a laminada \u00e9 baixa ou a diferen\u00e7a de temperatura ao longo de todo o comprimento \u00e9 grande;
\n(4) Ajuste inadequado do laminador cont\u00ednuo.
\n(5) Ao cortar o metal no orif\u00edcio frontal do produto acabado, surgem cascas convexas na superf\u00edcie da pe\u00e7a laminada, e formam-se sali\u00eancias peri\u00f3dicas durante a lamina\u00e7\u00e3o.<\/p>\n

Os m\u00e9todos de preven\u00e7\u00e3o e elimina\u00e7\u00e3o s\u00e3o:<\/p>\n

(1) Escolha um fator de largura adequado e aperfei\u00e7oe o projeto do furo;
\n(2) Fortalecer o processo de ajuste do laminador e distribuir adequadamente o grau de redu\u00e7\u00e3o;
\n(3) Instale corretamente o trilho de entrada com o orif\u00edcio pronto;
\n(4) Substituir as ranhuras de desgaste que apresentem desgaste acentuado;
\n(5) Melhorar a qualidade do aquecimento do tarugo para atingir uma temperatura uniforme.<\/p>","protected":false},"excerpt":{"rendered":"

Cast rolling nozzles are calcined at high temperatures and do not contain organic matter. The shrinkage rate at 800\u00b0C is zero, and it can be…<\/p>","protected":false},"author":1,"featured_media":11690,"comment_status":"closed","ping_status":"closed","sticky":false,"template":"","format":"standard","meta":{"footnotes":""},"categories":[233],"tags":[],"class_list":["post-11688","post","type-post","status-publish","format-standard","has-post-thumbnail","hentry","category-blog"],"yoast_head":"\nCast Rolling Nozzles for Molten Aluminum -sales@alalloycasting.com<\/title>\n<meta name=\"description\" content=\"Cast-rolling nozzles are calcined at high temperatures and do not contain organic matter. 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