{"id":5068,"date":"2020-09-25T06:52:48","date_gmt":"2020-09-25T06:52:48","guid":{"rendered":"http:\/\/www.alalloycasting.com\/?p=5068"},"modified":"2020-09-25T06:52:48","modified_gmt":"2020-09-25T06:52:48","slug":"aluminum-pinholes","status":"publish","type":"post","link":"https:\/\/www.alalloycasting.com\/pt\/aluminum-pinholes\/","title":{"rendered":"Orif\u00edcios de alum\u00ednio"},"content":{"rendered":"

A principal causa dos poros min\u00fasculos no alum\u00ednio:<\/strong><\/p>\n

Quanto mais alta for a temperatura de fus\u00e3o, mais hidrog\u00eanio o metal fundido absorver\u00e1 do ar \u00famido. A principal fonte de hidrog\u00eanio \u00e9 a decomposi\u00e7\u00e3o do vapor de \u00e1gua na alta temperatura do alum\u00ednio fundido. A solubilidade do hidrog\u00eanio no alum\u00ednio fundido aumenta \u00e0 medida que a temperatura sobe, mas a solubilidade no alum\u00ednio s\u00f3lido \u00e9 muito baixa. Portanto, durante o processo de solidifica\u00e7\u00e3o, os poros formados pela precipita\u00e7\u00e3o de hidrog\u00eanio t\u00eam uma rela\u00e7\u00e3o mais estreita com a temperatura de fus\u00e3o da liga e o tempo de fus\u00e3o. Se o controle for inadequado na fase final da fus\u00e3o \u2014 por exemplo, se o aquecimento for muito r\u00e1pido ou muito intenso \u2014, a quantidade de hidrog\u00eanio absorvida pelo alum\u00ednio l\u00edquido ser\u00e1 grande, o hidrog\u00eanio se difundir\u00e1 mais amplamente no alum\u00ednio l\u00edquido e a probabilidade de forma\u00e7\u00e3o de poros ser\u00e1 maior. H\u00e1 menos poros pr\u00f3ximos \u00e0 superf\u00edcie externa devido ao resfriamento mais r\u00e1pido. De acordo com algumas informa\u00e7\u00f5es, a 700 \u2103, a solubilidade do hidrog\u00eanio em 100 g de alum\u00ednio \u00e9 de 0,5 a 0,9 cm\u00b3. Quando a temperatura sobe para 850 \u2103, a solubilidade do hidrog\u00eanio aumenta de 2 a 3 vezes. Portanto, a fus\u00e3o deve ser controlada abaixo de 750 \u00b0C, e recomenda-se a fus\u00e3o r\u00e1pida, mas o problema da velocidade de aumento excessivamente r\u00e1pida na fase final do aquecimento deve ser controlado.<\/p>\n

An\u00e1lise operacional <\/strong><\/p>\n

\u2460A carga n\u00e3o est\u00e1 limpa, e o tempo de cozimento da carga traseira \u00e9 curto.<\/p>\n

\u2461 Projeto inadequado do sistema de vazamento.<\/p>\n

\u2462A alta temperatura de vazamento e uma opera\u00e7\u00e3o inadequada de vazamento podem causar a entrada de g\u00e1s e esc\u00f3ria.<\/p>\n

\u2463 O agente de refino est\u00e1 \u00famido, e o tempo de repouso ap\u00f3s o tratamento de deteriora\u00e7\u00e3o \u00e9 insuficiente.<\/p>\n

\u2464O pr\u00e9-aquecimento da carga \u00e9 inadequado e descuidado.<\/p>\n

\"Orif\u00edcios<\/p>\n

Medidas para o tratamento de poros min\u00fasculos no alum\u00ednio<\/strong><\/p>\n

Processo de fus\u00e3o<\/p>\n

\u2460 Altere a propor\u00e7\u00e3o entre material novo e material reciclado para 30% de material reciclado e 70% de material novo.<\/p>\n

\u2461Aprimorar o processo de fundi\u00e7\u00e3o e remover a ferrugem, o lodo e outras impurezas da superf\u00edcie da carga antes do uso, a fim de evitar a entrada de umidade e \u00f3leo.<\/p>\n

\u2462Para obter pe\u00e7as fundidas de alum\u00ednio sem poros ou com menos poros, o pr\u00e9-aquecimento da carga \u00e9 a etapa fundamental. A temperatura de pr\u00e9-aquecimento \u00e9 de 350 a 450 \u2103 e deve ser mantida por mais de 3 horas. Se o tempo de pr\u00e9-aquecimento da carga for curto, ainda haver\u00e1 um pequeno n\u00famero de poros min\u00fasculos e difusos na se\u00e7\u00e3o da pe\u00e7a fundida.<\/p>\n

A secagem e o pr\u00e9-aquecimento do agente de refino apresentam grandes vantagens. Ap\u00f3s o refino e antes do vazamento, o l\u00edquido da liga deve repousar por um determinado per\u00edodo, a fim de eliminar as inclus\u00f5es de oxida\u00e7\u00e3o e o hidrog\u00eanio presentes no alum\u00ednio l\u00edquido. Se o agente de refino estiver \u00famido, ele tamb\u00e9m introduzir\u00e1 uma grande quantidade de hidrog\u00eanio. No caso de fornos que passaram por revis\u00e3o ou que n\u00e3o s\u00e3o utilizados h\u00e1 muito tempo, \u00e9 necess\u00e1rio que sejam totalmente aquecidos; caso contr\u00e1rio, a umidade presente no refrat\u00e1rio se evaporar\u00e1 e formar\u00e1 uma atmosfera \u00famida, o que levar\u00e1 \u00e0 forma\u00e7\u00e3o de poros durante a fundi\u00e7\u00e3o.<\/p>\n

Para eliminar poros min\u00fasculos nas pe\u00e7as fundidas de liga de alum\u00ednio, o cadinho utilizado na fus\u00e3o pode ser empregado como concha. Quando o cadinho atinge a temperatura de vazamento ap\u00f3s o refinamento e a metamorfose, ele \u00e9 levantado manualmente e o metal \u00e9 vazado diretamente, a fim de evitar a entrada de ar causada pela posi\u00e7\u00e3o invertida da concha. As ferramentas utilizadas devem ser limpas antes do uso e, em seguida, revestidas com revestimentos protetores, pr\u00e9-aquecidas e secas para evitar um pr\u00e9-aquecimento inadequado e a adsor\u00e7\u00e3o de umidade na superf\u00edcie, o que geraria uma grande quantidade de g\u00e1s durante o processo de fundi\u00e7\u00e3o e vazamento, resultando em poros nas pe\u00e7as fundidas.<\/p>\n

Al\u00e9m disso, utilize um agente de cobertura especial para cobrir durante o processo de fus\u00e3o. O agente de desgaseifica\u00e7\u00e3o, refino e modifica\u00e7\u00e3o \u00e9 selecionado, e a quantidade adicionada \u00e9 de 0,61 TP3T do peso do alum\u00ednio fundido. Ele precisa ser seco antes do uso. Quando a temperatura da liga l\u00edquida atingir 720 \u2103, utilize uma camp\u00e2nula de a\u00e7o inoxid\u00e1vel para pressionar o agente de desgaseifica\u00e7\u00e3o e refino contra o fundo do cadinho e mova-a a uma velocidade constante ao longo da parede interna do cadinho, evitando que qualquer tipo de impureza entre no cadinho.<\/p>","protected":false},"excerpt":{"rendered":"

The main reason for aluminum pinholes: The higher the smelting temperature, the more serious the molten metal will absorb hydrogen from the humid air. The…<\/p>","protected":false},"author":1,"featured_media":5139,"comment_status":"closed","ping_status":"closed","sticky":false,"template":"","format":"standard","meta":{"footnotes":""},"categories":[233],"tags":[],"class_list":["post-5068","post","type-post","status-publish","format-standard","has-post-thumbnail","hentry","category-blog"],"yoast_head":"\nAluminum Pinholes Treatment Measures in Casting Process<\/title>\n<meta name=\"description\" content=\"Aluminum Pinholes Treatment Measures: use a special covering agent to cover during the melting process. 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