{"id":2711,"date":"2015-10-05T11:22:36","date_gmt":"2015-10-05T14:22:36","guid":{"rendered":"http:\/\/www.abifa.org.br\/?p=2711"},"modified":"2015-10-05T11:22:36","modified_gmt":"2015-10-05T14:22:36","slug":"producao-e-controle-de-cascas-ceramicas","status":"publish","type":"post","link":"https:\/\/abifa.org.br\/site\/producao-e-controle-de-cascas-ceramicas\/","title":{"rendered":"Produ\u00e7\u00e3o e controle de cascas cer\u00e2micas"},"content":{"rendered":"

PROCESSO DE MICROFUS\u00c3O<\/h4>\n
\"Jurandir-001\"<\/a><\/div>\n

Dentre as etapas de produ\u00e7\u00e3o do processo de microfus\u00e3o, apresentam-se sucintamente nesta reportagem o processamento e o controle para a produ\u00e7\u00e3o de cascas cer\u00e2micas.<\/p>\n

Basicamente, inicia-se a produ\u00e7\u00e3o de cascas cer\u00e2micas atrav\u00e9s da imers\u00e3o do cacho de cera em um banho de lama refrat\u00e1ria. Essa imers\u00e3o deve ser realizada de tal forma que seja feito um recobrimento totalmente uniforme. Posteriormente, recobre-se o cacho com part\u00edculas refrat\u00e1rias, etapa essa denominada estucagem. O recobrimento com part\u00edculas refrat\u00e1rias pode ser realizado atrav\u00e9s de um chuveiro de areia ou da imers\u00e3o do cacho em leito fluidizado.<\/p>\n

Por fim, realiza-se a secagem dos moldes cer\u00e2micos. Este procedimento \u00e9 repetido por v\u00e1rias vezes, utilizando-se gr\u00e3os progressivamente maiores at\u00e9 a forma\u00e7\u00e3o de uma casca refrat\u00e1ria suficientemente forte para resistir essencialmente a dois esfor\u00e7os:<\/p>\n

– Sa\u00edda do material termopl\u00e1stico (cera) sob a\u00e7\u00e3o do calor.
\n– Entrada do metal l\u00edquido e suport\u00e1-lo at\u00e9 completa solidifica\u00e7\u00e3o.<\/p>\n

\"prod.casca\"<\/a><\/p>\n

As primeiras lamas cont\u00eam p\u00f3 de refrat\u00e1rios mais finos e as part\u00edculas de estucagem da primeira camada tamb\u00e9m s\u00e3o mais finas que as camadas de refor\u00e7o. O n\u00famero de camadas necess\u00e1rias est\u00e1 relacionado com o tamanho do cacho e o metal a ser vazado. Na pr\u00e1tica, geralmente este n\u00famero situa-se entre 6 a 9 camadas.<\/p>\n

\u00c9 importante controlar a temperatura e a umidade da sala de lama para evitar o aparecimento de trincas nas cascas durante a secagem. Como por exemplo, recomenda-se, para lamas \u00e0 base de s\u00edlica coloidal, umidade maior que 40%. Para condi\u00e7\u00f5es normais, recomenda-se umidade de 50% como ideal. Um ponto essencial \u00e9 que as varia\u00e7\u00f5es tanto de temperatura quanto de umidade n\u00e3o sejam grandes. Experi\u00eancias indicam de 4 a no m\u00e1ximo 6\u00b0 de varia\u00e7\u00e3o.<\/p>\n

Os materiais utilizados para a produ\u00e7\u00e3o da casca (lama e estuco) s\u00e3o: refrat\u00e1rios, aglomerantes, agentes de molhamento, antiespumantes e outros aditivos.<\/p>\n

Os refrat\u00e1rios normalmente utilizados na lama e\/ou estucagem s\u00e3o: s\u00edlica eletrofundida; zirconita; v\u00e1rios tipos de silicatos de alum\u00ednio e outros refrat\u00e1rios patenteados. A maioria deles possui s\u00edlica em sua composi\u00e7\u00e3o, por exemplo, a pr\u00f3pria s\u00edlica eletrofundida e a zirconita (silicato de zirc\u00f4nio), al\u00e9m dos v\u00e1rios silicatos de alum\u00ednio compostos por mulita e geralmente por s\u00edlica.<\/p>\n

SENAI Ita\u00fana CETEF \u201cMarcelino Corradi\u201d<\/strong><\/p>\n

Reyler Bueno Faria \u2013 Analista de Tecnologia.<\/strong><\/p>\n

REFER\u00caNCIA BIBLIOGR\u00c1FICA:<\/strong><\/p>\n

– MACHADO, Ion\u00e1 Mac\u00eado Leonardo. Avalia\u00e7\u00e3o Microestrutural de Cascas Cer\u00e2micas Utilizadas na Produ\u00e7\u00e3o de Moldes para o Processo de Fundi\u00e7\u00e3o por Cera Perdida. Disserta\u00e7\u00e3o. Universidade Federal de Minas Gerais \u2013 UFMG. 2005.<\/p>\n

– HORTON, A. H. Investment casting. In Annual Handbook: casting. Metal Park, 1998. v. 15, p. 253-269 il., 1998.<\/p>\n\n\n\n
\"reyler\"<\/td>\n Reyler Bueno Faria<\/strong> \u2013 Analista de Tecnologia.SENAI Ita\u00fana CETEF \u201cMarcelino Corradi\u201d<\/td>\n<\/td>\n<\/tr>\n<\/tbody>\n<\/table>\n","protected":false},"excerpt":{"rendered":"

PROCESSO DE MICROFUS\u00c3O Dentre as etapas de produ\u00e7\u00e3o do processo…<\/p>\n

Leia mais<\/a><\/p>\n","protected":false},"author":1,"featured_media":0,"comment_status":"closed","ping_status":"closed","sticky":false,"template":"","format":"aside","meta":{"_acf_changed":false,"om_disable_all_campaigns":false,"_uf_show_specific_survey":0,"_uf_disable_surveys":false,"footnotes":""},"categories":[30],"tags":[],"class_list":{"0":"post-2711","1":"post","2":"type-post","3":"status-publish","4":"format-aside","6":"category-noticias-comissao-microfusao","7":"post_format-post-format-aside"},"acf":[],"yoast_head":"\nProdu\u00e7\u00e3o e controle de cascas cer\u00e2micas - ABIFA<\/title>\n<meta name=\"robots\" content=\"index, follow, max-snippet:-1, max-image-preview:large, max-video-preview:-1\" \/>\n<link rel=\"canonical\" href=\"https:\/\/abifa.org.br\/site\/producao-e-controle-de-cascas-ceramicas\/\" \/>\n<meta property=\"og:locale\" content=\"pt_BR\" \/>\n<meta property=\"og:type\" content=\"article\" \/>\n<meta property=\"og:title\" content=\"Produ\u00e7\u00e3o e controle de cascas cer\u00e2micas\" \/>\n<meta property=\"og:description\" content=\"PROCESSO DE MICROFUS\u00c3O Dentre as etapas de produ\u00e7\u00e3o do processo… Leia mais\" \/>\n<meta property=\"og:url\" content=\"https:\/\/abifa.org.br\/site\/producao-e-controle-de-cascas-ceramicas\/\" \/>\n<meta property=\"og:site_name\" content=\"ABIFA\" \/>\n<meta property=\"article:published_time\" content=\"2015-10-05T14:22:36+00:00\" \/>\n<meta property=\"og:image\" content=\"http:\/\/www.abifa.org.br\/wp-content\/uploads\/2015\/09\/Jurandir-001.jpg\" \/>\n<meta name=\"author\" content=\"ABIFA\" \/>\n<meta name=\"twitter:card\" content=\"summary_large_image\" \/>\n<meta name=\"twitter:label1\" content=\"Escrito por\" \/>\n\t<meta name=\"twitter:data1\" content=\"ABIFA\" \/>\n\t<meta name=\"twitter:label2\" content=\"Est. tempo de leitura\" \/>\n\t<meta name=\"twitter:data2\" content=\"2 minutos\" \/>\n<script type=\"application\/ld+json\" class=\"yoast-schema-graph\">{\"@context\":\"https:\/\/schema.org\",\"@graph\":[{\"@type\":\"Article\",\"@id\":\"https:\/\/abifa.org.br\/site\/producao-e-controle-de-cascas-ceramicas\/#article\",\"isPartOf\":{\"@id\":\"https:\/\/abifa.org.br\/site\/producao-e-controle-de-cascas-ceramicas\/\"},\"author\":{\"name\":\"ABIFA\",\"@id\":\"https:\/\/abifa.org.br\/site\/#\/schema\/person\/7f5efb1b42ce680f4197d4088b88318c\"},\"headline\":\"Produ\u00e7\u00e3o e controle de cascas cer\u00e2micas\",\"datePublished\":\"2015-10-05T14:22:36+00:00\",\"mainEntityOfPage\":{\"@id\":\"https:\/\/abifa.org.br\/site\/producao-e-controle-de-cascas-ceramicas\/\"},\"wordCount\":496,\"publisher\":{\"@id\":\"https:\/\/abifa.org.br\/site\/#organization\"},\"image\":{\"@id\":\"https:\/\/abifa.org.br\/site\/producao-e-controle-de-cascas-ceramicas\/#primaryimage\"},\"thumbnailUrl\":\"http:\/\/www.abifa.org.br\/wp-content\/uploads\/2015\/09\/Jurandir-001.jpg\",\"articleSection\":[\"Not\u00edcias Comiss\u00e3o de Microfus\u00e3o\"],\"inLanguage\":\"pt-BR\"},{\"@type\":\"WebPage\",\"@id\":\"https:\/\/abifa.org.br\/site\/producao-e-controle-de-cascas-ceramicas\/\",\"url\":\"https:\/\/abifa.org.br\/site\/producao-e-controle-de-cascas-ceramicas\/\",\"name\":\"Produ\u00e7\u00e3o e controle de cascas cer\u00e2micas - 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