{"id":21763,"date":"2026-10-11T09:14:39","date_gmt":"2026-10-11T01:14:39","guid":{"rendered":"https:\/\/aobosteel.com\/?page_id=21763"},"modified":"2026-10-16T02:30:47","modified_gmt":"2026-10-15T18:30:47","slug":"miniature-die-casting-die-materials","status":"publish","type":"page","link":"https:\/\/aobosteel.com\/pt\/miniature-die-casting-die-materials\/","title":{"rendered":"Materiais e Dureza de Moldes de Fundi\u00e7\u00e3o sob Press\u00e3o em Miniatura"},"content":{"rendered":"<h1 class=\"wp-block-heading\">Materiais e Dureza de Moldes de Fundi\u00e7\u00e3o sob Press\u00e3o em Miniatura<\/h1>\n\n\n\n<p class=\"wp-block-paragraph\">A fundi\u00e7\u00e3o sob press\u00e3o em miniatura produz pe\u00e7as pequenas de zinco e zinco-alum\u00ednio em m\u00e1quinas que ciclam at\u00e9 cerca de cem vezes por minuto, mantendo dimens\u00f5es abaixo de um mil\u00e9simo de polegada. O molde n\u00e3o \u00e9 um par de blocos. \u00c9 um conjunto de slides, cada um sendo um molde e uma haste, e cada componente desse conjunto tem seu pr\u00f3prio material e sua pr\u00f3pria dureza. Esta p\u00e1gina apresenta a lista de componentes com o material e a dureza publicados para ele nas normas de ferramental da NADCA, define quais desses graus s\u00e3o de trabalho a quente e quais n\u00e3o s\u00e3o, e explica para que servem os diferentes n\u00edveis de dureza.<\/p>\n\n\n\n<h2 class=\"wp-block-heading\">Como um molde em miniatura \u00e9 montado<\/h2>\n\n\n\n<p class=\"wp-block-paragraph\">Um molde e uma haste juntos formam um slide. Um molde de quatro slides, portanto, tem quatro de cada, dispostos ao redor da pe\u00e7a fundida, e a pr\u00f3pria ilustra\u00e7\u00e3o da montagem na norma mostra a cabe\u00e7a do molde em cada slide, um bloco de pinos de macho, uma placa ejetora estacion\u00e1ria e uma montada na haste, e o sistema de canais alimentado por baixo. A m\u00e1quina \u00e9 programada para mover os slides em sequ\u00eancia. Ap\u00f3s o molde ser pulverizado com lubrificante, o slide superior entra, depois o slide inferior, depois os slides esquerdo e direito, e o metal \u00e9 injetado por baixo pelo princ\u00edpio de c\u00e2mara quente. Ap\u00f3s uma breve solidifica\u00e7\u00e3o, os slides ciclam para fora na ordem inversa e a pe\u00e7a fundida \u00e9 extra\u00edda e soprada para limpeza.<\/p>\n\n\n\n<p class=\"wp-block-paragraph\">A eje\u00e7\u00e3o \u00e9 uma das duas op\u00e7\u00f5es que a norma indica. Uma placa ejetora retira a pe\u00e7a fundida do molde e n\u00e3o deixa marca nela, enquanto pinos ejetores padr\u00e3o tamb\u00e9m s\u00e3o pr\u00e1tica comum e tendem a deixar marcas na pe\u00e7a fundida. A escolha \u00e9 feita na fase de projeto, e n\u00e3o na ferramentaria. Quanto \u00e0s cavidades, moldes de cavidade \u00fanica s\u00e3o preferidos para que cada pe\u00e7a seja id\u00eantica, o que importa onde h\u00e1 equipamento de montagem autom\u00e1tica a jusante, e moldes de m\u00faltiplas cavidades s\u00e3o usados onde o volume exige.<\/p>\n\n\n\n<h2 class=\"wp-block-heading\">Material e dureza dos componentes<\/h2>\n\n\n\n<p class=\"wp-block-paragraph\">A tabela abaixo \u00e9 a lista publicada para um molde em miniatura t\u00edpico. \u00c9 curta, e o padr\u00e3o nela vale a pena ser lido antes dos valores individuais. O H-13 aparece tr\u00eas vezes em tr\u00eas n\u00edveis diferentes de dureza, portanto o mesmo a\u00e7o est\u00e1 sendo solicitado a desempenhar tr\u00eas fun\u00e7\u00f5es diferentes. Os dois componentes que recebem a carga de fechamento s\u00e3o o S-7. A cabe\u00e7a do molde \u00e9 mantida mais dura do que qualquer outra coisa no conjunto, exceto a superf\u00edcie dos pinos ejetores.<\/p>\n\n\n\n<figure class=\"wp-block-table is-style-stripes\"><table class=\"has-fixed-layout\"><thead><tr><th class=\"has-text-align-left\" data-align=\"left\">Componente<\/th><th class=\"has-text-align-left\" data-align=\"left\">Material<\/th><th class=\"has-text-align-left\" data-align=\"left\">Dureza e condi\u00e7\u00e3o<\/th><\/tr><\/thead><tbody><tr><td class=\"has-text-align-left\" data-align=\"left\">Molde<\/td><td class=\"has-text-align-left\" data-align=\"left\">T-1<\/td><td class=\"has-text-align-left\" data-align=\"left\">56 a 58 HRC<\/td><\/tr><tr><td class=\"has-text-align-left\" data-align=\"left\">Insertos e subinsertos<\/td><td class=\"has-text-align-left\" data-align=\"left\">H-13<\/td><td class=\"has-text-align-left\" data-align=\"left\">46 a 48 HRC<\/td><\/tr><tr><td class=\"has-text-align-left\" data-align=\"left\">Haste<\/td><td class=\"has-text-align-left\" data-align=\"left\">S-7<\/td><td class=\"has-text-align-left\" data-align=\"left\">54 a 56 HRC<\/td><\/tr><tr><td class=\"has-text-align-left\" data-align=\"left\">Placa ejetora e suporte<\/td><td class=\"has-text-align-left\" data-align=\"left\">S-7<\/td><td class=\"has-text-align-left\" data-align=\"left\">54 a 56 HRC<\/td><\/tr><tr><td class=\"has-text-align-left\" data-align=\"left\">Pinos extratores<\/td><td class=\"has-text-align-left\" data-align=\"left\">H-13<\/td><td class=\"has-text-align-left\" data-align=\"left\">65 a 74 HRC, cementado<\/td><\/tr><tr><td class=\"has-text-align-left\" data-align=\"left\">Pinos de n\u00facleo<\/td><td class=\"has-text-align-left\" data-align=\"left\">H-13<\/td><td class=\"has-text-align-left\" data-align=\"left\">50 a 55 HRC, temperado em toda a se\u00e7\u00e3o<\/td><\/tr><tr><td class=\"has-text-align-left\" data-align=\"left\">Cruzeta e estrutura<\/td><td class=\"has-text-align-left\" data-align=\"left\">Ferro fundido cinzento<\/td><td class=\"has-text-align-left\" data-align=\"left\">N\u00e3o aplic\u00e1vel<\/td><\/tr><\/tbody><\/table><\/figure>\n\n\n\n<p class=\"wp-block-paragraph\"><em>Materiais de constru\u00e7\u00e3o e requisitos de dureza para componentes t\u00edpicos de moldes em miniatura, conforme publicado na se\u00e7\u00e3o de fundi\u00e7\u00e3o sob press\u00e3o em miniatura das normas de especifica\u00e7\u00e3o de produto da NADCA. A fonte apresenta os valores de dureza na escala Rockwell C, e as designa\u00e7\u00f5es de material s\u00e3o as designa\u00e7\u00f5es de grau americanas.<\/em><\/p>\n\n\n\n<h2 class=\"wp-block-heading\">Os tr\u00eas a\u00e7os da lista<\/h2>\n\n\n\n<p class=\"wp-block-paragraph\">Dois dos tr\u00eas materiais dessa tabela s\u00e3o a\u00e7os ferramenta em servi\u00e7o comum em todos os outros lugares, e um \u00e9 de outra natureza. O H-13 \u00e9 o a\u00e7o de trabalho a quente com 5 por cento de cromo usado em fundi\u00e7\u00e3o sob press\u00e3o, forjamento e extrus\u00e3o, e \u00e9 o grau que enfrenta o metal fundido neste molde. O S-7 \u00e9 um grau resistente ao choque, formulado para ferramentas que recebem impactos em vez de calor, raz\u00e3o pela qual aparece na haste e na placa ejetora, onde o slide fecha contra a m\u00e1quina. O T-1 \u00e9 um a\u00e7o r\u00e1pido do tipo tungst\u00eanio, um a\u00e7o para ferramenta de corte por origem, e est\u00e1 sustentando a cabe\u00e7a do molde aqui porque a impress\u00e3o \u00e9 pequena e precisa manter sua forma.<\/p>\n\n\n\n<figure class=\"wp-block-table is-style-stripes\"><table class=\"has-fixed-layout\"><thead><tr><th class=\"has-text-align-left\" data-align=\"left\">Grau<\/th><th class=\"has-text-align-left\" data-align=\"left\">O que \u00e9 o grau<\/th><th class=\"has-text-align-left\" data-align=\"left\">O que ele faz em um molde em miniatura<\/th><\/tr><\/thead><tbody><tr><td class=\"has-text-align-left\" data-align=\"left\">H-13<\/td><td class=\"has-text-align-left\" data-align=\"left\">Um a\u00e7o ferramenta de trabalho a quente com 5 por cento de cromo<\/td><td class=\"has-text-align-left\" data-align=\"left\">Sustenta as superf\u00edcies de trabalho e os pinos pequenos, em tr\u00eas n\u00edveis diferentes de dureza no mesmo molde<\/td><\/tr><tr><td class=\"has-text-align-left\" data-align=\"left\">S-7<\/td><td class=\"has-text-align-left\" data-align=\"left\">Um a\u00e7o ferramenta resistente ao choque<\/td><td class=\"has-text-align-left\" data-align=\"left\">Sustenta os componentes que fecham contra a m\u00e1quina, onde a tenacidade ao impacto importa mais do que a dureza a quente<\/td><\/tr><tr><td class=\"has-text-align-left\" data-align=\"left\">T-1<\/td><td class=\"has-text-align-left\" data-align=\"left\">Um a\u00e7o r\u00e1pido do tipo tungst\u00eanio<\/td><td class=\"has-text-align-left\" data-align=\"left\">Sustenta a cabe\u00e7a do molde, onde a impress\u00e3o \u00e9 pequena e deve manter sua forma<\/td><\/tr><\/tbody><\/table><\/figure>\n\n\n\n<p class=\"wp-block-paragraph\"><em>Os a\u00e7os ferramenta nomeados na lista de componentes de moldes em miniatura e o papel que cada um desempenha na montagem.<\/em><\/p>\n\n\n\n<h2 class=\"wp-block-heading\">Por que os insertos s\u00e3o mais macios que a haste<\/h2>\n\n\n\n<p class=\"wp-block-paragraph\">Os insertos e subinsertos s\u00e3o mantidos a 46 a 48 HRC e a haste e a placa ejetora a 54 a 56 HRC, e a diferen\u00e7a entre eles \u00e9 deliberada, e n\u00e3o um erro na lista. Um a\u00e7o de trabalho a quente perde tenacidade \u00e0 medida que \u00e9 levado a durezas mais altas, e o inserto \u00e9 o componente que sofre o ciclismo t\u00e9rmico do zinco e da pulveriza\u00e7\u00e3o do molde. Mant\u00ea-lo na faixa superior dos quarenta mant\u00e9m a tenacidade que resiste \u00e0 fissura\u00e7\u00e3o t\u00e9rmica e preserva uma margem para retrabalhar a impress\u00e3o. A haste e a placa ejetora n\u00e3o veem metal fundido algum, apenas a carga de fechamento, portanto podem ser mantidas mais duras para desgaste e para estabilidade dimensional. A mesma l\u00f3gica est\u00e1 por tr\u00e1s dos pinos de macho a 50 a 55 HRC temperados em toda a se\u00e7\u00e3o, que \u00e9 uma pe\u00e7a de pequeno di\u00e2metro que precisa resistir ao desgaste e \u00e0 flex\u00e3o ao mesmo tempo.<\/p>\n\n\n\n<p class=\"wp-block-paragraph\">Os pinos ejetores s\u00e3o a exce\u00e7\u00e3o e recebem uma camada. Mantidos a 65 a 74 HRC na superf\u00edcie, um pino resiste ao desgaste de deslizar contra o molde, enquanto o n\u00facleo do pino permanece macio o suficiente para sobreviver ao acionamento. Essa combina\u00e7\u00e3o s\u00f3 est\u00e1 dispon\u00edvel onde a dureza \u00e9 produzida por um tratamento superficial em vez de temperar o pino inteiro em toda a se\u00e7\u00e3o. O compromisso \u00e9 entre as duas propriedades, e est\u00e1 apresentado na <a href=\"https:\/\/aobosteel.com\/pt\/tool-steel-impact-toughness-chart\/\">gr\u00e1fico de tenacidade ao impacto<\/a> e explicado para um a\u00e7o de trabalho a quente na <a href=\"https:\/\/aobosteel.com\/pt\/h13-die-softening-in-service\/\">p\u00e1gina de amolecimento de molde H13<\/a>.<\/p>\n\n\n\n<h2 class=\"wp-block-heading\">Graus e estoque<\/h2>\n\n\n\n<p class=\"wp-block-paragraph\">Dos tr\u00eas a\u00e7os na lista de componentes, a linha H-13 \u00e9 a que produzimos e mantemos em estoque, em barra e chapa forjadas, e cobre os insertos, os pinos de macho e o estoque de pinos ejetores da lista. A p\u00e1gina do H-13 traz a an\u00e1lise e as formas de fornecimento, e a alternativa para um molde que est\u00e1 se mostrando sens\u00edvel a trincas est\u00e1 na <a href=\"https:\/\/aobosteel.com\/pt\/h11-tool-steel\/\">p\u00e1gina do H11<\/a>. O S-7 tamb\u00e9m \u00e9 uma linha de estoque, porque os graus resistentes ao choque s\u00e3o desejados nas mesmas ferramentarias, e sua faixa de dureza e tratamento est\u00e3o na <a href=\"https:\/\/aobosteel.com\/pt\/s7-tool-steel\/\">p\u00e1gina do a\u00e7o ferramenta S-7<\/a> e o <a href=\"https:\/\/aobosteel.com\/pt\/s7-tool-steel-rockwell-hardness-chart\/\">gr\u00e1fico de dureza do S-7<\/a>. O T-1 \u00e9 um a\u00e7o r\u00e1pido ao tungst\u00eanio e n\u00e3o um a\u00e7o para trabalho a quente, est\u00e1 fora da nossa faixa de estoque padr\u00e3o, e quando um cabe\u00e7ote de matriz \u00e9 especificado em T-1 o bloco \u00e9 normalmente fornecido conforme o desenho.<\/p>\n\n\n\n<h2 class=\"wp-block-heading\">Para onde ir em seguida<\/h2>\n\n\n\n<p class=\"wp-block-paragraph\">Os pr\u00f3prios graus para trabalho a quente s\u00e3o descritos na <a href=\"https:\/\/aobosteel.com\/pt\/h13-tool-steel\/\">p\u00e1gina do a\u00e7o ferramenta H13<\/a>, e os materiais usados nos componentes de uma matriz de fundi\u00e7\u00e3o sob press\u00e3o convencional est\u00e3o listados na <a href=\"https:\/\/aobosteel.com\/pt\/die-casting-die-component-materials\/\">p\u00e1gina de materiais de componentes de moldes de fundi\u00e7\u00e3o sob press\u00e3o<\/a>. A escolha do grau por metal fundido est\u00e1 na <a href=\"https:\/\/aobosteel.com\/pt\/best-tool-steels-for-die-casting-dies\/\">p\u00e1gina de sele\u00e7\u00e3o de a\u00e7o para moldes de fundi\u00e7\u00e3o sob press\u00e3o<\/a> e a escolha de n\u00facleo e inserto na <a href=\"https:\/\/aobosteel.com\/pt\/selection-of-tool-steel-for-die-casting-cores-and-inserts\/\">p\u00e1gina de sele\u00e7\u00e3o de machos e insertos<\/a>. O lado do zinco do processo, que \u00e9 onde a fundi\u00e7\u00e3o sob press\u00e3o em miniatura se concentra principalmente, \u00e9 abordado na <a href=\"https:\/\/aobosteel.com\/pt\/die-materials-for-zinc-and-magnesium-die-casting\/\">p\u00e1gina de materiais de fundi\u00e7\u00e3o de zinco e magn\u00e9sio<\/a>. Como essas matrizes realmente falham est\u00e1 na <a href=\"https:\/\/aobosteel.com\/pt\/thermal-fatigue-cracking-in-die-casting-dies\/\">p\u00e1gina de trinca por fadiga t\u00e9rmica<\/a>, e como um grau \u00e9 confirmado em rela\u00e7\u00e3o ao seu certificado na <a href=\"https:\/\/aobosteel.com\/pt\/tool-steel-quality-verification\/\">p\u00e1gina de verifica\u00e7\u00e3o de qualidade<\/a>.<\/p>\n\n\n\n<div class=\"wp-block-group has-background is-layout-constrained wp-container-core-group-is-layout-3e4fb3d2 wp-block-group-is-layout-constrained\" style=\"border-radius:8px;background-color:#f4f8ff;margin-bottom:24px;padding-top:20px;padding-right:24px;padding-bottom:20px;padding-left:24px\">\n<p class=\"wp-block-paragraph\"><strong>Materiais e dureza de matrizes de fundi\u00e7\u00e3o sob press\u00e3o em miniatura, PDF para impress\u00e3o<\/strong><\/p>\n\n<p class=\"wp-block-paragraph\">A lista de componentes com seus valores de material e dureza, como uma matriz em miniatura de m\u00faltiplos slides \u00e9 montada e sequenciada, por que os insertos s\u00e3o mais macios que o shank, e quais dos graus n\u00f3s mantemos, em uma folha de refer\u00eancia com nossos dados de contato.<\/p>\n\n<div class=\"wp-block-buttons is-layout-flex wp-block-buttons-is-layout-flex\">\n<div class=\"wp-block-button\"><a class=\"wp-block-button__link wp-element-button\" href=\"https:\/\/aobosteel.com\/wp-content\/uploads\/2026\/10\/Aobo-Steel-Miniature-Die-Casting-Die-Materials.pdf\">Baixar PDF<\/a><\/div>\n\n<\/div>\n<\/div>\n\n\n\n<h3 class=\"wp-block-heading\">Antes de usar isto como especifica\u00e7\u00e3o de matriz<\/h3>\n\n\n\n<p class=\"wp-block-paragraph\">Esta p\u00e1gina \u00e9 um resumo de refer\u00eancia de uma fonte publicada e n\u00e3o \u00e9 uma especifica\u00e7\u00e3o da Aobo Steel. A lista de componentes, os materiais e os valores de dureza s\u00e3o reproduzidos das normas de especifica\u00e7\u00e3o de produto da NADCA, que \u00e9 um documento protegido por direitos autorais publicado pela North American Die Casting Association, e o racioc\u00ednio apresentado em torno dos n\u00fameros \u00e9 pr\u00e1tica geral de a\u00e7o para ferramentas e n\u00e3o um requisito daquele documento. As faixas de dureza em uma matriz em opera\u00e7\u00e3o s\u00e3o definidas pelo fabricante da matriz em fun\u00e7\u00e3o da pe\u00e7a, da m\u00e1quina e da produ\u00e7\u00e3o, e o grau efetivamente fornecido \u00e9 confirmado no trabalho.<\/p>\n\n\n\n<p class=\"wp-block-paragraph\">Fonte, NADCA Product Specification Standards for Die Castings, se\u00e7\u00e3o Engineering and Design, Miniature Die Casting, North American Die Casting Association, 2009.<\/p>","protected":false},"excerpt":{"rendered":"<p>Miniature Die Casting Die Materials and Hardness Miniature die casting makes small zinc and zinc aluminium parts on machines that cycle up to around a hundred times a minute, holding dimensions under a thousandth of an inch. The die is not a pair of blocks. It is a set of slides, each one a die [&hellip;]<\/p>\n","protected":false},"author":1,"featured_media":0,"parent":0,"menu_order":0,"comment_status":"closed","ping_status":"closed","template":"","meta":{"_uag_custom_page_level_css":"","site-sidebar-layout":"default","site-content-layout":"","ast-site-content-layout":"normal-width-container","site-content-style":"default","site-sidebar-style":"default","ast-global-header-display":"","ast-banner-title-visibility":"","ast-main-header-display":"","ast-hfb-above-header-display":"","ast-hfb-below-header-display":"","ast-hfb-mobile-header-display":"","site-post-title":"disabled","ast-breadcrumbs-content":"","ast-featured-img":"","footer-sml-layout":"","ast-disable-related-posts":"","theme-transparent-header-meta":"","adv-header-id-meta":"","stick-header-meta":"","header-above-stick-meta":"","header-main-stick-meta":"","header-below-stick-meta":"","astra-migrate-meta-layouts":"default","ast-page-background-enabled":"default","ast-page-background-meta":{"desktop":{"background-color":"","background-image":"","background-repeat":"repeat","background-position":"center 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