{"id":8248,"date":"2021-03-31T03:56:26","date_gmt":"2021-03-31T03:56:26","guid":{"rendered":"http:\/\/www.alalloycasting.com\/?p=8248"},"modified":"2021-03-31T03:56:26","modified_gmt":"2021-03-31T03:56:26","slug":"feeder-caster-tips","status":"publish","type":"post","link":"https:\/\/www.alalloycasting.com\/pt\/feeder-caster-tips\/","title":{"rendered":"Dicas para o lan\u00e7ador de isca"},"content":{"rendered":"

Durante o processo de fundi\u00e7\u00e3o de tiras de alum\u00ednio, o alum\u00ednio fundido \u00e9 alimentado a partir das pontas alongadas do alimentador da m\u00e1quina de fundi\u00e7\u00e3o para o espa\u00e7o entre dois rolos contrarrotativos resfriados a \u00e1gua. O alum\u00ednio fundido \u00e9 resfriado ao entrar em contato com os rolos e continua sendo resfriado ao passar entre eles, formando assim uma tira met\u00e1lica fundida larga e de espessura uniforme. Enquanto o metal l\u00edquido for fornecido \u00e0 m\u00e1quina de fundi\u00e7\u00e3o, o processo de fundi\u00e7\u00e3o poder\u00e1 prosseguir continuamente.<\/p>\n

As pontas do Feeder Caster s\u00e3o geralmente feitas de um material cer\u00e2mico de baixa densidade, capaz de resistir \u00e0 abras\u00e3o e ao choque t\u00e9rmico causados pelo contato com o alum\u00ednio l\u00edquido, como, por exemplo, um placa de fibra cer\u00e2mica<\/a> na forma necess\u00e1ria.<\/p>\n

Devido \u00e0 baixa densidade desses materiais, sua condutividade t\u00e9rmica \u00e9 muito baixa (geralmente inferior a 0,18 W\/mK) e pode proporcionar um certo grau de isolamento t\u00e9rmico para o alum\u00ednio l\u00edquido no Dica sobre rod\u00edzios<\/a>.<\/p>\n

No entanto, ap\u00f3s um per\u00edodo de produ\u00e7\u00e3o, elas podem sofrer corros\u00e3o qu\u00edmica e desgaste. Isso levar\u00e1 \u00e0 forma\u00e7\u00e3o de diversas impurezas na estrutura da ponta e, eventualmente, resultar\u00e1 na interrup\u00e7\u00e3o precoce do movimento de fundi\u00e7\u00e3o.<\/p>\n

\"Laje<\/p>\n

Princ\u00edpios gerais para a defini\u00e7\u00e3o da zona de fundi\u00e7\u00e3o e lamina\u00e7\u00e3o<\/p>\n

A espessura da chapa laminada por fundi\u00e7\u00e3o \u00e9 aumentada, e a \u00e1rea laminada por fundi\u00e7\u00e3o \u00e9 reduzida.
\nO di\u00e2metro do rolo de fundi\u00e7\u00e3o aumenta, e a \u00e1rea de fundi\u00e7\u00e3o tamb\u00e9m aumenta.
\nA espessura do bordo do bico de fundi\u00e7\u00e3o aumenta e a \u00e1rea de lamina\u00e7\u00e3o da fundi\u00e7\u00e3o tamb\u00e9m aumenta.
\nA for\u00e7a de lamina\u00e7\u00e3o do equipamento \u00e9 elevada, e a \u00e1rea de fundi\u00e7\u00e3o e lamina\u00e7\u00e3o foi ampliada.
\nA zona de lamina\u00e7\u00e3o por fundi\u00e7\u00e3o para alum\u00ednio puro e ligas macias \u00e9 um pouco mais longa, enquanto a zona de lamina\u00e7\u00e3o por fundi\u00e7\u00e3o para ligas duras \u00e9 um pouco mais curta.
\nA velocidade de lamina\u00e7\u00e3o por fundi\u00e7\u00e3o refere-se \u00e0 velocidade da chapa laminada por fundi\u00e7\u00e3o. Em compara\u00e7\u00e3o com a velocidade linear do rolo de fundi\u00e7\u00e3o, a velocidade de lamina\u00e7\u00e3o por fundi\u00e7\u00e3o apresenta um certo deslizamento para a frente. Quanto maior o di\u00e2metro, maior o deslizamento para a frente. O deslizamento para a frente \u00e9 geralmente de cerca de 6-10%.<\/p>\n

A velocidade de fundi\u00e7\u00e3o \u00e9 determinada pela cavidade l\u00edquida. Quando a velocidade de rolagem da fundi\u00e7\u00e3o aumenta at\u00e9 um determinado valor cr\u00edtico, a frente de cristaliza\u00e7\u00e3o se desloca para o plano de sa\u00edda do rolo de fundi\u00e7\u00e3o. Devido ao atraso no resfriamento, a cavidade l\u00edquida se aprofunda at\u00e9 que seja tarde demais para o metal se solidificar, e o metal l\u00edquido escorre para fora do rolo. As costuras fluem para fora e afetam a lamina\u00e7\u00e3o normal.<\/p>\n

Portanto, existe um limite na velocidade de lamina\u00e7\u00e3o da pe\u00e7a fundida, ou seja, a velocidade m\u00e1xima para uma lamina\u00e7\u00e3o est\u00e1vel na cavidade l\u00edquida cr\u00edtica.<\/p>","protected":false},"excerpt":{"rendered":"

During the aluminum strip casting process, molten aluminum is fed from the elongated feeder caster tips into the nip between two counter-rotating water-cooled rolls. 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