{"id":1908,"date":"2020-05-15T02:42:10","date_gmt":"2020-05-15T02:42:10","guid":{"rendered":"http:\/\/alalloycasting.com\/?p=1908"},"modified":"2020-08-31T07:03:02","modified_gmt":"2020-08-31T07:03:02","slug":"aluminum-alloy-casting-performance","status":"publish","type":"post","link":"https:\/\/www.alalloycasting.com\/pt\/aluminum-alloy-casting-performance\/","title":{"rendered":"Desempenho da fundi\u00e7\u00e3o de ligas de alum\u00ednio"},"content":{"rendered":"

O desempenho da fundi\u00e7\u00e3o de ligas de alum\u00ednio refere-se ao comportamento do alum\u00ednio fundido durante todo o processo de fundi\u00e7\u00e3o, cristaliza\u00e7\u00e3o e resfriamento. Esse desempenho inclui fluidez, retra\u00e7\u00e3o, estanqueidade, tens\u00e3o de fundi\u00e7\u00e3o e getter. Essas caracter\u00edsticas dependem da composi\u00e7\u00e3o da liga, mas tamb\u00e9m est\u00e3o relacionadas a fatores de fundi\u00e7\u00e3o, como a temperatura de aquecimento da liga, a complexidade da pe\u00e7a fundida, o sistema de canais de alimenta\u00e7\u00e3o e de alimenta\u00e7\u00e3o, a forma do canal de alimenta\u00e7\u00e3o, etc.<\/p>\n

Desempenho da fundi\u00e7\u00e3o de ligas de alum\u00ednio<\/h2>\n

O desempenho da fundi\u00e7\u00e3o de ligas de alum\u00ednio inclui fluidez, contratilidade, fissura\u00e7\u00e3o t\u00e9rmica, estanqueidade ao ar, tens\u00e3o de fundi\u00e7\u00e3o e inspirabilidade.<\/p>\n

Fluidez<\/strong><\/p>\n

A fluidez refere-se \u00e0 capacidade do l\u00edquido da liga de preencher o molde. O grau de fluidez determina se a liga \u00e9 capaz de produzir pe\u00e7as fundidas complexas. A liga eut\u00e9tica apresenta a melhor fluidez entre as ligas de alum\u00ednio. Existem muitos fatores que afetam a fluidez, principalmente a composi\u00e7\u00e3o, a temperatura e as part\u00edculas em fase s\u00f3lida de \u00f3xidos met\u00e1licos, compostos met\u00e1licos e outros contaminantes presentes no metal l\u00edquido. No entanto, os fatores externos fundamentais s\u00e3o a temperatura de vazamento e a press\u00e3o de vazamento. Na produ\u00e7\u00e3o real, al\u00e9m de aprimorar o processo de fundi\u00e7\u00e3o (refinamento e remo\u00e7\u00e3o de esc\u00f3ria<\/a>), tamb\u00e9m \u00e9 necess\u00e1rio melhorar a moldabilidade e aumentar a temperatura de vazamento sem comprometer a qualidade da pe\u00e7a fundida, de modo a garantir a fluidez da liga.<\/p>\n

\"Desempenho<\/p>\n

Contratilidade<\/strong><\/p>\n

O encolhimento \u00e9 uma das principais caracter\u00edsticas das ligas de alum\u00ednio fundidas. De modo geral, o processo da liga \u00e9 dividido em tr\u00eas etapas, desde a fundi\u00e7\u00e3o no estado l\u00edquido at\u00e9 a solidifica\u00e7\u00e3o e o resfriamento: o encolhimento na fase l\u00edquida, o encolhimento na solidifica\u00e7\u00e3o e o encolhimento no estado s\u00f3lido. O encolhimento da liga exerce uma influ\u00eancia decisiva na qualidade da pe\u00e7a fundida. Ele afeta o tamanho gradual dos poros de encolhimento, a gera\u00e7\u00e3o de tens\u00f5es, a forma\u00e7\u00e3o de trincas e a altera\u00e7\u00e3o nas dimens\u00f5es.<\/p>\n

Craqueamento t\u00e9rmico<\/strong><\/p>\n

A ocorr\u00eancia de trincas t\u00e9rmicas em pe\u00e7as fundidas de alum\u00ednio deve-se principalmente ao fato de a tens\u00e3o de contra\u00e7\u00e3o das pe\u00e7as exceder a for\u00e7a de liga\u00e7\u00e3o entre os gr\u00e3os do metal. A maioria delas se forma ao longo dos limites dos gr\u00e3os. Na zona da fratura, o metal na regi\u00e3o da fissura costuma estar oxidado e perde o brilho. As fissuras se estendem ao longo do limite dos gr\u00e3os, apresentando formato em zigue-zague, sendo mais largas na superf\u00edcie e mais estreitas no interior. Assim, algumas delas penetram at\u00e9 a face terminal de toda a pe\u00e7a fundida.<\/p>\n

Estanqueidade ao ar<\/strong><\/p>\n

A estanqueidade da liga de alum\u00ednio fundido refere-se ao grau em que a pe\u00e7a fundida de alum\u00ednio do tipo cavidade n\u00e3o apresenta vazamentos sob a a\u00e7\u00e3o de g\u00e1s ou l\u00edquido a alta press\u00e3o. A estanqueidade, na verdade, indica o grau de compacta\u00e7\u00e3o e pureza da estrutura interna da pe\u00e7a fundida. A estanqueidade da liga de alum\u00ednio fundida est\u00e1 relacionada \u00e0s propriedades da liga. Quanto menor for a faixa de solidifica\u00e7\u00e3o da liga, menor ser\u00e1 a tend\u00eancia ao afrouxamento; e quanto menores forem os poros de precipita\u00e7\u00e3o, maior ser\u00e1 a estanqueidade da liga.<\/p>\n

Quanto maior for o teor de hidrog\u00eanio no l\u00edquido da liga de alum\u00ednio, mais poros se formam na pe\u00e7a fundida. Os poros na pe\u00e7a fundida de alum\u00ednio reduzem a estanqueidade e a resist\u00eancia \u00e0 corros\u00e3o da pe\u00e7a, al\u00e9m de prejudicarem as propriedades mec\u00e2nicas da liga. O segredo para obter pe\u00e7as fundidas de alum\u00ednio sem poros ou com poucos poros est\u00e1 nas condi\u00e7\u00f5es de fus\u00e3o. Se for adicionado agente de cobertura<\/a> Durante a fundi\u00e7\u00e3o, o volume inspirat\u00f3rio da liga \u00e9 bastante reduzido. O refinamento do alum\u00ednio l\u00edquido permite controlar de forma eficaz o teor de hidrog\u00eanio no alum\u00ednio l\u00edquido. AdTech online\u00a0unidade de desgaseifica\u00e7\u00e3o<\/strong><\/a> Adota uma nova tecnologia de fabrica\u00e7\u00e3o de materiais de fus\u00e3o com alto teor de sil\u00edcio, o que permite a desgaseifica\u00e7\u00e3o eficaz do alum\u00ednio l\u00edquido.<\/p>\n

\"Desempenho<\/p>\n

Tens\u00e3o de fundi\u00e7\u00e3o<\/strong><\/p>\n

A tens\u00e3o de fundi\u00e7\u00e3o inclui a tens\u00e3o t\u00e9rmica, a tens\u00e3o de transforma\u00e7\u00e3o de fase e a tens\u00e3o de contra\u00e7\u00e3o. A tens\u00e3o t\u00e9rmica \u00e9 causada pela espessura irregular e pelo resfriamento desigual. A tens\u00e3o de compress\u00e3o se forma na parede fina, resultando em tens\u00e3o residual na pe\u00e7a fundida. A tens\u00e3o de transforma\u00e7\u00e3o de fase deve-se \u00e0 mudan\u00e7a de fase durante o processo de resfriamento ap\u00f3s a solidifica\u00e7\u00e3o e \u00e0 consequente altera\u00e7\u00e3o no volume e no tamanho. A tens\u00e3o de contra\u00e7\u00e3o \u00e9 causada pela tens\u00e3o de tra\u00e7\u00e3o resultante do bloqueio do molde e do n\u00facleo quando a pe\u00e7a fundida de alum\u00ednio se contrai. Essa tens\u00e3o \u00e9 tempor\u00e1ria e desaparece automaticamente ao retirar a pe\u00e7a do molde.<\/p>\n

No entanto, um tempo inadequado de desmoldagem costuma causar fissuras t\u00e9rmicas; especialmente as ligas de alum\u00ednio fundidas em moldes met\u00e1licos s\u00e3o propensas a fissuras t\u00e9rmicas sob tal tens\u00e3o. A tens\u00e3o residual na liga de alum\u00ednio fundida reduz as propriedades mec\u00e2nicas da liga e afeta a precis\u00e3o de usinagem da pe\u00e7a fundida. A tens\u00e3o residual das pe\u00e7as fundidas de alum\u00ednio pode ser eliminada por recozimento.<\/p>\n

Inspirat\u00f3rio<\/strong><\/p>\n

As ligas de alum\u00ednio absorvem facilmente o g\u00e1s hidrog\u00eanio, e essa absor\u00e7\u00e3o \u00e9 a principal caracter\u00edstica das ligas de alum\u00ednio fundidas. Quanto mais alta a temperatura da solu\u00e7\u00e3o da liga de alum\u00ednio, maior a quantidade de hidrog\u00eanio absorvida. A 700 \u00b0C, a solubilidade do hidrog\u00eanio por 100 g de alum\u00ednio \u00e9 de 0,5 a 0,9. Quando a temperatura \u00e9 aumentada para 850 \u00b0C, a solubilidade do hidrog\u00eanio aumenta de 2 a 3 vezes. Quando h\u00e1 impurezas de metais alcalinos, a solubilidade do hidrog\u00eanio no alum\u00ednio l\u00edquido aumenta significativamente.<\/p>\n

Al\u00e9m do processo de gettering durante a fus\u00e3o, as ligas de alum\u00ednio fundidas tamb\u00e9m geram gettering ao serem vertidas no molde. Al\u00e9m do processo de gettering durante a fus\u00e3o, as ligas de alum\u00ednio fundidas tamb\u00e9m geram gettering ao serem vertidas no molde. \u00c0 medida que a temperatura do alum\u00ednio l\u00edquido diminui, a solubilidade do g\u00e1s diminui, e o excesso de g\u00e1s se precipita. Uma parte do g\u00e1s inevit\u00e1vel permanece na pe\u00e7a fundida, formando bolhas de ar, comumente chamadas de \u201cpinhole\u201d. \u00c0s vezes, o g\u00e1s se combina com a cavidade de contra\u00e7\u00e3o, e o g\u00e1s precipitado no alum\u00ednio l\u00edquido permanece nessa cavidade.<\/p>\n

Se a press\u00e3o gerada pela bolha for muito grande, a superf\u00edcie do poro fica lisa e h\u00e1 um anel de camada brilhante ao redor do orif\u00edcio. Se a press\u00e3o gerada pela bolha for pequena, a superf\u00edcie interna do poro fica enrugada.<\/p>","protected":false},"excerpt":{"rendered":"

Aluminum alloy casting performance refers to the performance of molten aluminum in the process of full casting, crystallization and cooling. It has fluidity, shrinkage, airtightness,…<\/p>","protected":false},"author":1,"featured_media":4345,"comment_status":"closed","ping_status":"closed","sticky":false,"template":"","format":"standard","meta":{"footnotes":""},"categories":[233],"tags":[148,147],"class_list":["post-1908","post","type-post","status-publish","format-standard","has-post-thumbnail","hentry","category-blog","tag-aluminum-alloy-casting","tag-aluminum-alloy-casting-performance"],"yoast_head":"\nAluminum Alloy Casting Performance in the process of casting<\/title>\n<meta name=\"description\" content=\"Aluminum alloy casting performance refers to the performance of molten aluminum in the process of full casting, crystallization and cooling.\" \/>\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\/aluminum-alloy-casting-performance\/\" \/>\n<meta property=\"og:locale\" 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