{"id":592,"date":"2026-01-05T15:02:24","date_gmt":"2026-01-05T15:02:24","guid":{"rendered":"https:\/\/sjnbcasting.com\/?p=592"},"modified":"2026-01-05T15:02:58","modified_gmt":"2026-01-05T15:02:58","slug":"what-is-the-manufacturing-process-of-cores-in-sand-casting","status":"publish","type":"post","link":"https:\/\/sjnbcasting.com\/pt_br\/what-is-the-manufacturing-process-of-cores-in-sand-casting\/","title":{"rendered":"Qual \u00e9 o processo de fabrica\u00e7\u00e3o de n\u00facleos em fundi\u00e7\u00e3o em areia?"},"content":{"rendered":"<h2>1. Introdu\u00e7\u00e3o aos n\u00facleos<\/h2>\n<p>No <a href=\"https:\/\/sjnbcasting.com\/pt_br\/process\/\">processo de fundi\u00e7\u00e3o em areia<\/a>, cores are an independent sand &#8211; based forming component, mainly used to form specific cavities, holes or complex structures inside castings. It is used in conjunction with the external sand mold (mold) to form a complete casting cavity, ensuring that the liquid metal can form an internal shape that meets the design requirements after solidification. The core is one of the core technologies to solve the forming problems of complex &#8211; structure castings.<\/p>\n<p>A fun\u00e7\u00e3o principal do n\u00facleo \u00e9 moldar a cavidade interna da pe\u00e7a fundida. Ele pode ser utilizado para fabricar tubos, diversos orif\u00edcios (como os canais de \u00e1gua e de \u00f3leo dos cilindros de motores), orif\u00edcios cegos e outras estruturas que n\u00e3o podem ser formadas diretamente por moldes externos. Ao mesmo tempo, ele permite a constru\u00e7\u00e3o de formas geom\u00e9tricas complexas e a forma\u00e7\u00e3o de estruturas internas precisas, como canais de bielas no c\u00e1rter e canais de resfriamento de p\u00e1s de turbina. Al\u00e9m disso, o n\u00facleo pode reduzir a varia\u00e7\u00e3o na espessura das paredes das pe\u00e7as fundidas, evitar defeitos de pontos quentes causados por espessuras locais irregulares das paredes; e pode orientar a dire\u00e7\u00e3o do fluxo do metal fundido, otimizar o efeito de preenchimento e melhorar a qualidade da pe\u00e7a fundida.<\/p>\n<h2>2. Requisitos t\u00edpicos de desempenho dos n\u00facleos<\/h2>\n<ul>\n<li>Alta resist\u00eancia: Deve suportar o impacto do metal fundido (por exemplo, a for\u00e7a de impacto durante o vazamento de ferro fundido pode chegar a 0,3 MPa) para garantir que n\u00e3o se rache durante o processo de vazamento.<\/li>\n<li>Good Air Permeability: It must be able to discharge gas smoothly in a high &#8211; temperature environment, and the air permeability index must be \u2265100cm\u00b3\/(cm\u00b2\u00b7min).<\/li>\n<li>F\u00e1cil desmontagem: Ap\u00f3s o vazamento, deve ser poss\u00edvel desmont\u00e1-lo por meio de vibra\u00e7\u00e3o ou a\u00e7\u00e3o qu\u00edmica para facilitar as opera\u00e7\u00f5es subsequentes de limpeza da areia, e a resist\u00eancia residual deve ser &lt; 0,5 MPa.<\/li>\n<li>Alta precis\u00e3o: A toler\u00e2ncia dimensional das pe\u00e7as-chave deve ser mantida dentro da faixa do grau CT8 (\u00b10,25 mm).<\/li>\n<\/ul>\n<h2>3. Processo de fabrica\u00e7\u00e3o de n\u00facleos<\/h2>\n<h3>(1) Tecnologia de conforma\u00e7\u00e3o<\/h3>\n<ul>\n<li>M\u00e9todo de inje\u00e7\u00e3o de n\u00facleos: A areia misturada \u00e9 injetada na caixa de n\u00facleo em alta velocidade por meio de uma m\u00e1quina de inje\u00e7\u00e3o de n\u00facleos, e o n\u00facleo \u00e9 desmoldado ap\u00f3s o endurecimento. Esse m\u00e9todo apresenta alta efici\u00eancia de produ\u00e7\u00e3o, de at\u00e9 120 moldes por hora, e \u00e9 adequado para a produ\u00e7\u00e3o em massa de n\u00facleos padronizados.<\/li>\n<li>3D Printing Method: Adhesive Jetting technology is used to directly print complex cores with a forming accuracy of up to \u00b10.3mm. No core box is required, which is suitable for the rapid manufacturing of small &#8211; batch and complex &#8211; structure cores.<\/li>\n<li>M\u00e9todo Cold Box: A trietilamina \u00e9 utilizada como catalisador para que a resina sofra uma rea\u00e7\u00e3o de endurecimento \u00e0 temperatura ambiente. Ap\u00f3s a moldagem, a rugosidade superficial Ra do n\u00facleo \u00e9 \u226412,5 \u03bcm, o que proporciona alta efici\u00eancia e alta precis\u00e3o.<\/li>\n<\/ul>\n<h3>(2) Post &#8211; treatment Process<\/h3>\n<ul>\n<li>Drying: The resin sand core needs to be baked at a temperature of 200 &#8211; 250\u2103 for 2 &#8211; 4 hours to remove the moisture inside the core and improve the strength and stability of the core.<\/li>\n<li>Coating: The surface of the core is dipped with zircon powder coating, and the coating thickness is controlled at 0.2 &#8211; 0.5mm, which can significantly improve the high &#8211; temperature resistance of the core and prevent sand sticking defects during pouring.<\/li>\n<\/ul>\n<p><a href=\"https:\/\/sjnbcasting.com\/pt_br\/solution\/\"><img loading=\"lazy\" decoding=\"async\" class=\"alignnone wp-image-560 size-full\" src=\"https:\/\/sjnbcasting.com\/wp-content\/uploads\/2025\/12\/Suijin-Wet-Sand-Casting-Processes.jpg\" alt=\"What is the Manufacturing Process of Cores in Sand Casting?\" width=\"800\" height=\"500\" srcset=\"https:\/\/sjnbcasting.com\/wp-content\/uploads\/2025\/12\/Suijin-Wet-Sand-Casting-Processes.jpg 800w, https:\/\/sjnbcasting.com\/wp-content\/uploads\/2025\/12\/Suijin-Wet-Sand-Casting-Processes-480x300.jpg 480w\" sizes=\"(min-width: 0px) and (max-width: 480px) 480px, (min-width: 481px) 800px, 100vw\" \/><\/a><\/p>\n<h2>4. Mat\u00e9rias-primas e m\u00e9todos de fabrica\u00e7\u00e3o dos n\u00facleos<\/h2>\n<p>As mat\u00e9rias-primas do n\u00facleo s\u00e3o geralmente as mesmas da areia de resina utilizada no <a href=\"https:\/\/sjnbcasting.com\/pt_br\/process\/\">processo de fundi\u00e7\u00e3o<\/a>. During production, the resin sand is filled into the core box matching the internal shape of the casting. According to the technical capabilities and equipment conditions of the production enterprise, the sand can be formed in the core box by compaction, heating or sand blowing. Then the core is taken out of the core box and can be put into the mold for use after post &#8211; treatment.<br \/>\nExistem dois m\u00e9todos principais de fabrica\u00e7\u00e3o de n\u00facleos: o m\u00e9todo da caixa quente e o m\u00e9todo da caixa fria:<\/p>\n<ul>\n<li>M\u00e9todo Hot Box: Adiciona-se um catalisador \u00e0 areia resinada, e esse catalisador \u00e9 ativado pelo aquecimento da caixa de n\u00facleo para promover o endurecimento e a moldagem da areia resinada.<\/li>\n<li>M\u00e9todo Cold Box: \u00c9 utilizado um catalisador que pode ser ativado sem aquecimento. Quando a resina e a areia s\u00e3o misturadas, o catalisador entra em a\u00e7\u00e3o automaticamente, fazendo com que o n\u00facleo de areia endure\u00e7a e se forme \u00e0 temperatura ambiente.<\/li>\n<\/ul>\n<h2>5. M\u00e9todos de fixa\u00e7\u00e3o dos n\u00facleos<\/h2>\n<p>Durante o processo de vazamento, quando o metal fundido \u00e9 injetado no molde, ele colide com o n\u00facleo e o faz flutuar, o que leva ao seu f\u00e1cil deslocamento ou flutua\u00e7\u00e3o. Portanto, \u00e9 necess\u00e1rio adotar um m\u00e9todo de fixa\u00e7\u00e3o adequado:<\/p>\n<ul>\n<li>M\u00e9todo de fixa\u00e7\u00e3o do assento do n\u00facleo: O assento do n\u00facleo \u00e9 feito do mesmo metal que o molde, o que fixa com precis\u00e3o o n\u00facleo na posi\u00e7\u00e3o designada no molde at\u00e9 que o vazamento do metal fundido seja conclu\u00eddo e ele esfrie. Ap\u00f3s o resfriamento, o assento do n\u00facleo em contato com o metal fundido passar\u00e1 a fazer parte da pe\u00e7a fundida. Ap\u00f3s a forma\u00e7\u00e3o da pe\u00e7a fundida, o n\u00facleo \u00e9 desmontado e retirado por vibra\u00e7\u00e3o.<\/li>\n<li>M\u00e9todo de fixa\u00e7\u00e3o do n\u00facleo prolongado: Quando a pe\u00e7a fundida apresenta um espa\u00e7o al\u00e9m da parede externa do molde que n\u00e3o pode ser preenchido com metal, o n\u00facleo pode ser feito mais longo do que o molde e fixado por meio de uma ranhura reservada no molde de areia, a fim de impedir que se mova durante o processo de vazamento.<\/li>\n<\/ul>\n<p>Core technology is the core means for sand casting to realize the production of castings with complex internal cavity structures. Its development process has continuously promoted the progress of the casting industry, from traditional manual core making to intelligent 3D printing core making. In the future, with the in &#8211; depth application of bionic structure design (such as topology &#8211; optimized honeycomb cores) and digital twin technology, cores will play a more important role in realizing casting lightweight and functional integration, providing strong support for the high &#8211; quality development of the casting industry.<\/p>\n<p>Se voc\u00ea quiser saber mais sobre n\u00facleos na fundi\u00e7\u00e3o em areia, n\u00e3o hesite em entrar em contato conosco.<\/p>","protected":false},"excerpt":{"rendered":"<p>1. Introduction to Cores In the sand casting process, cores are an independent sand &#8211; based forming component, mainly used to form specific cavities, holes or complex structures inside castings. It is used in conjunction with the external sand mold (mold) to form a complete casting cavity, ensuring that the liquid metal can form an [&hellip;]<\/p>\n","protected":false},"author":1,"featured_media":560,"comment_status":"closed","ping_status":"closed","sticky":false,"template":"","format":"standard","meta":{"_et_pb_use_builder":"","_et_pb_old_content":"","_et_gb_content_width":"","_monsterinsights_skip_tracking":false,"_monsterinsights_sitenote_active":false,"_monsterinsights_sitenote_note":"","_monsterinsights_sitenote_category":0,"_jetpack_memberships_contains_paid_content":false,"footnotes":""},"categories":[23],"tags":[],"class_list":["post-592","post","type-post","status-publish","format-standard","has-post-thumbnail","hentry","category-industry"],"jetpack_featured_media_url":"https:\/\/sjnbcasting.com\/wp-content\/uploads\/2025\/12\/Suijin-Wet-Sand-Casting-Processes.jpg","jetpack_sharing_enabled":true,"_links":{"self":[{"href":"https:\/\/sjnbcasting.com\/pt_br\/wp-json\/wp\/v2\/posts\/592","targetHints":{"allow":["GET"]}}],"collection":[{"href":"https:\/\/sjnbcasting.com\/pt_br\/wp-json\/wp\/v2\/posts"}],"about":[{"href":"https:\/\/sjnbcasting.com\/pt_br\/wp-json\/wp\/v2\/types\/post"}],"author":[{"embeddable":true,"href":"https:\/\/sjnbcasting.com\/pt_br\/wp-json\/wp\/v2\/users\/1"}],"replies":[{"embeddable":true,"href":"https:\/\/sjnbcasting.com\/pt_br\/wp-json\/wp\/v2\/comments?post=592"}],"version-history":[{"count":4,"href":"https:\/\/sjnbcasting.com\/pt_br\/wp-json\/wp\/v2\/posts\/592\/revisions"}],"predecessor-version":[{"id":596,"href":"https:\/\/sjnbcasting.com\/pt_br\/wp-json\/wp\/v2\/posts\/592\/revisions\/596"}],"wp:featuredmedia":[{"embeddable":true,"href":"https:\/\/sjnbcasting.com\/pt_br\/wp-json\/wp\/v2\/media\/560"}],"wp:attachment":[{"href":"https:\/\/sjnbcasting.com\/pt_br\/wp-json\/wp\/v2\/media?parent=592"}],"wp:term":[{"taxonomy":"category","embeddable":true,"href":"https:\/\/sjnbcasting.com\/pt_br\/wp-json\/wp\/v2\/categories?post=592"},{"taxonomy":"post_tag","embeddable":true,"href":"https:\/\/sjnbcasting.com\/pt_br\/wp-json\/wp\/v2\/tags?post=592"}],"curies":[{"name":"wp","href":"https:\/\/api.w.org\/{rel}","templated":true}]}}