{"id":11745,"date":"2025-12-26T11:23:10","date_gmt":"2025-12-26T03:23:10","guid":{"rendered":"https:\/\/aobosteel.com\/?page_id=11745"},"modified":"2026-04-02T15:56:04","modified_gmt":"2026-04-02T07:56:04","slug":"selection-of-tool-steel-for-hobs-and-broaches","status":"publish","type":"page","link":"https:\/\/aobosteel.com\/pt\/selection-of-tool-steel-for-hobs-and-broaches\/","title":{"rendered":"Sele\u00e7\u00e3o de a\u00e7o ferramenta para fresas e brochas"},"content":{"rendered":"<div class=\"wp-block-uagb-container uagb-block-ebab83dd alignfull uagb-is-root-container\"><div class=\"uagb-container-inner-blocks-wrap\">\n<h1 class=\"wp-block-heading\" id=\"h-selection-of-tool-steel-for-hobs-and-broaches\">Sele\u00e7\u00e3o de a\u00e7o ferramenta para fresas e brochas<\/h1>\n\n\n\n<p class=\"wp-block-paragraph\">As fresas rotativas s\u00e3o ferramentas de corte rotativas usadas para gerar dentes de engrenagem e outras formas repetidas, enquanto as brochas s\u00e3o ferramentas lineares com m\u00faltiplos dentes que removem material em uma \u00fanica passada por meio de dentes progressivamente maiores. Apesar dessa diferen\u00e7a no movimento, ambas s\u00e3o ferramentas de corte que operam sob alta tens\u00e3o localizada, alto atrito e altas temperaturas nas arestas de corte.<\/p>\n\n\n\n<p class=\"wp-block-paragraph\">Durante o corte, a deforma\u00e7\u00e3o pl\u00e1stica na zona de cisalhamento e o atrito na interface ferramenta-cavaco geram calor substancial, e as temperaturas da aresta podem chegar a 1000 \u00b0C em opera\u00e7\u00f5es exigentes. As brocas tamb\u00e9m suportam altas cargas estruturais, pois muitos dentes engatam sequencialmente, e o corpo da ferramenta deve transmitir grandes for\u00e7as de tra\u00e7\u00e3o ou compress\u00e3o, \u00e0s vezes pr\u00f3ximas a 0,9 MN. Nessas condi\u00e7\u00f5es, os principais modos de falha s\u00e3o desgaste de cratera, desgaste de flanco, lascamento da aresta, entalhe por profundidade de corte e amolecimento t\u00e9rmico. A sele\u00e7\u00e3o do a\u00e7o ferramenta, portanto, depende de qual modo de falha limita primeiro a vida \u00fatil da ferramenta.<\/p>\n\n\n\n<h2 class=\"wp-block-heading\">Fatores de sele\u00e7\u00e3o<\/h2>\n\n\n\n<p class=\"wp-block-paragraph\">Para fresas de engrenagem, o principal requisito \u00e9 a resist\u00eancia ao desgaste progressivo. Como a usinagem por engrenagem depende da manuten\u00e7\u00e3o da precis\u00e3o do perfil do dente ao longo de longos per\u00edodos de produ\u00e7\u00e3o, o desgaste de flanco e o desgaste de cratera geralmente s\u00e3o mais importantes do que a resist\u00eancia ao impacto. Na pr\u00e1tica, isso significa que a resist\u00eancia ao desgaste e a dureza a quente s\u00e3o normalmente mais importantes do que a tenacidade m\u00e1xima.<\/p>\n\n\n\n<p class=\"wp-block-paragraph\">Para brocas, o equil\u00edbrio \u00e9 mais delicado. Os dentes de brochamento devem resistir ao desgaste, mas tamb\u00e9m est\u00e3o sujeitos a cargas seccionais mais elevadas, vibra\u00e7\u00e3o e ao risco de sobrecarga localizada durante a entrada ou cortes irregulares. Se a dureza for levada ao extremo sem o devido suporte da tenacidade, o lascamento ou a quebra dos dentes tornam-se falhas comuns. Por essa raz\u00e3o, os a\u00e7os para brocas devem combinar boa resist\u00eancia ao desgaste com resist\u00eancia suficiente da aresta de corte para suportar cargas de corte reais.<\/p>\n\n\n\n<p class=\"wp-block-paragraph\">A dureza a quente torna-se mais importante \u00e0 medida que a temperatura de corte aumenta. Ao usinar a\u00e7os-liga, ferros fundidos duros ou ligas resistentes ao calor, um a\u00e7o que perde dureza em temperaturas elevadas sofrer\u00e1 desgaste r\u00e1pido, mesmo que sua dureza \u00e0 temperatura ambiente seja alta. Nesses casos, o processo de aumento da dureza geralmente ocorre por amolecimento t\u00e9rmico, e n\u00e3o por simples abras\u00e3o.<\/p>\n\n\n\n<h2 class=\"wp-block-heading\">A\u00e7os para ferramentas recomendados<\/h2>\n\n\n\n<div class=\"wp-block-uagb-container uagb-block-df385be8\">\n<h3 class=\"wp-block-heading\" id=\"h-aisi-m2-tool-steel-1-3343-skh51\">A\u00e7o ferramenta AISI M2 | 1.3343 | SKH51<\/h3>\n\n\n\n<p class=\"wp-block-paragraph\">O a\u00e7o M2 continua sendo o ponto de partida padr\u00e3o tanto para fresas quanto para brochas, pois oferece um equil\u00edbrio pr\u00e1tico entre dureza, tenacidade, disponibilidade e custo de fabrica\u00e7\u00e3o. \u00c9 adequado quando as condi\u00e7\u00f5es de corte s\u00e3o est\u00e1veis e o principal objetivo \u00e9 um desempenho confi\u00e1vel, em vez da m\u00e1xima vida \u00fatil da ferramenta.<\/p>\n\n\n\n<p class=\"wp-block-paragraph\">A dureza de corte t\u00edpica \u00e9 de 64\u201366 HRC. Nesse n\u00edvel, o a\u00e7o M2 oferece resist\u00eancia ao desgaste adequada para muitas aplica\u00e7\u00f5es gerais de fresagem e brochamento, mantendo ainda tenacidade suficiente para garantir resist\u00eancia da aresta de corte e confiabilidade do corpo da ferramenta.<\/p>\n\n\n\n<p class=\"wp-block-paragraph\">Sua limita\u00e7\u00e3o se manifesta quando o desgaste se torna muito r\u00e1pido ou quando a temperatura de corte sobe al\u00e9m do que o a\u00e7o r\u00e1pido padr\u00e3o (HSS) consegue suportar eficientemente. Nessa situa\u00e7\u00e3o, o a\u00e7o M2 geralmente \u00e9 substitu\u00eddo n\u00e3o por falhar imediatamente, mas sim por se desgastar r\u00e1pido demais para continuar sendo economicamente vi\u00e1vel.<\/p>\n\n\n\n<div class=\"wp-block-buttons is-layout-flex wp-block-buttons-is-layout-flex\">\n<div class=\"wp-block-button has-custom-width wp-block-button__width-50 hs-cta-trigger-button hs-cta-trigger-button-230288465624\"><a class=\"wp-block-button__link wp-element-button\">Enviar consulta agora<\/a><\/div>\n\n\n\n<div class=\"wp-block-button has-custom-width wp-block-button__width-50 is-style-outline is-style-outline--1\"><a class=\"wp-block-button__link has-ast-global-color-3-color has-text-color has-background has-link-color wp-element-button\" href=\"https:\/\/aobosteel.com\/pt\/m2-tool-steel\/\" style=\"background-color:#ffffff00\">Veja os detalhes de fornecimento de material M2.<\/a><\/div>\n<\/div>\n<\/div>\n\n\n\n<div class=\"wp-block-uagb-container uagb-block-df385be8\">\n<h3 class=\"wp-block-heading\" id=\"h-aisi-m42-tool-steel-1-3247-skh59\">A\u00e7o ferramenta AISI M42 | 1.3247 | SKH59<\/h3>\n\n\n\n<p class=\"wp-block-paragraph\">O a\u00e7o M42 \u00e9 utilizado quando a dureza a quente \u00e9 o principal requisito. Com alto teor de cobalto e dureza de at\u00e9 69 HRC, \u00e9 ideal para ligas de dif\u00edcil usinagem, especialmente materiais resistentes ao calor e de alta resist\u00eancia, onde o calor de corte \u00e9 a principal causa da r\u00e1pida deteriora\u00e7\u00e3o da aresta de corte.<\/p>\n\n\n\n<p class=\"wp-block-paragraph\">Comparado ao M2, o M42 oferece melhor resist\u00eancia ao amolecimento t\u00e9rmico. No entanto, n\u00e3o proporciona a mesma margem de tenacidade, portanto, seu melhor desempenho \u00e9 obtido em condi\u00e7\u00f5es de corte est\u00e1veis, com choques e vibra\u00e7\u00f5es limitados e bom alinhamento.<\/p>\n\n\n\n<p class=\"wp-block-paragraph\">Em termos pr\u00e1ticos de sele\u00e7\u00e3o, o M42 geralmente \u00e9 preferido quando o principal problema \u00e9 a perda de resist\u00eancia da aresta em fun\u00e7\u00e3o da temperatura, em vez da quebra dos dentes devido \u00e0 sobrecarga mec\u00e2nica.<\/p>\n\n\n\n<div class=\"wp-block-buttons is-layout-flex wp-block-buttons-is-layout-flex\">\n<div class=\"wp-block-button has-custom-width wp-block-button__width-50 hs-cta-trigger-button hs-cta-trigger-button-230288465624\"><a class=\"wp-block-button__link wp-element-button\">Enviar consulta agora<\/a><\/div>\n\n\n\n<div class=\"wp-block-button has-custom-width wp-block-button__width-50 is-style-outline is-style-outline--2\"><a class=\"wp-block-button__link has-ast-global-color-3-color has-text-color has-background has-link-color wp-element-button\" href=\"https:\/\/aobosteel.com\/pt\/m42-tool-steel\/\" style=\"background-color:#ffffff00\">Veja os detalhes de fornecimento de material M42.<\/a><\/div>\n<\/div>\n<\/div>\n\n\n\n<div class=\"wp-block-uagb-container uagb-block-df385be8\">\n<h3 class=\"wp-block-heading\">M3 (Classe 2) e M4: Resist\u00eancia ao desgaste aprimorada<\/h3>\n\n\n\n<p class=\"wp-block-paragraph\">As classes M3 2 e M4 s\u00e3o melhorias l\u00f3gicas quando a classe M2 perde precis\u00e3o de corte muito rapidamente devido ao desgaste de flanco ou ao desgaste de cratera. Seus maiores teores de carbono e van\u00e1dio aumentam o volume de carboneto e melhoram a resist\u00eancia ao desgaste, o que as torna \u00fateis para lotes de produ\u00e7\u00e3o mais longos e materiais de trabalho mais abrasivos.<\/p>\n\n\n\n<p class=\"wp-block-paragraph\">O a\u00e7o M4 \u00e9 especialmente relevante em situa\u00e7\u00f5es onde o desgaste \u00e9 o principal fator limitante da vida \u00fatil e a estabilidade do processo \u00e9 boa. A vantagem \u00e9 uma melhor resist\u00eancia ao arredondamento das arestas e \u00e0 perda por abras\u00e3o, mas a desvantagem \u00e9 uma menor tenacidade em compara\u00e7\u00e3o com o M2.<\/p>\n\n\n\n<p class=\"wp-block-paragraph\">As vers\u00f5es produzidas por metalurgia do p\u00f3 refor\u00e7am a vantagem dessas classes de metal. Sua distribui\u00e7\u00e3o de carbonetos mais fina e uniforme melhora a confiabilidade estrutural e reduz a fragilidade associada \u00e0 segrega\u00e7\u00e3o de carbonetos grosseiros. Isso \u00e9 particularmente valioso em brochas de grandes dimens\u00f5es, onde tanto a resist\u00eancia ao desgaste quanto a integridade interna s\u00e3o cruciais.<\/p>\n<\/div>\n\n\n\n<div class=\"wp-block-uagb-container uagb-block-df385be8\">\n<h3 class=\"wp-block-heading\">T15: Dureza a quente e resist\u00eancia \u00e0 abras\u00e3o premium<\/h3>\n\n\n\n<p class=\"wp-block-paragraph\">O a\u00e7o T15 \u00e9 selecionado quando tanto a resist\u00eancia \u00e0 abras\u00e3o quanto a dureza a quente precisam ser superiores \u00e0s dos a\u00e7os M2 e M4. Seu alto teor de tungst\u00eanio, cobalto e van\u00e1dio o torna adequado para o corte de a\u00e7os de alta resist\u00eancia \u00e0 tra\u00e7\u00e3o, ferros fundidos duros e ligas aeroespaciais que geram altas temperaturas nas bordas da l\u00e2mina.<\/p>\n\n\n\n<p class=\"wp-block-paragraph\">Com dureza de 66\u201368 HRC, o a\u00e7o T15 mant\u00e9m o desempenho de corte em aplica\u00e7\u00f5es onde os a\u00e7os r\u00e1pidos padr\u00e3o amolecem muito rapidamente. Sua principal vantagem n\u00e3o \u00e9 apenas a alta dureza, mas tamb\u00e9m a capacidade de reter essa dureza sob altas temperaturas.<\/p>\n\n\n\n<p class=\"wp-block-paragraph\">Sua limita\u00e7\u00e3o reside no fato de que esse tipo de a\u00e7o \u00e9 mais dif\u00edcil e custoso de retificar e processar. Isso significa que seu uso se justifica quando a carga t\u00e9rmica e o desgaste abrasivo s\u00e3o suficientemente severos para reduzir a vida \u00fatil do a\u00e7o M2 ou M4, e n\u00e3o quando o trabalho se resume a um corte de rotina para fins gerais.<\/p>\n<\/div>\n\n\n\n<div class=\"wp-block-uagb-container uagb-block-df385be8\">\n<h3 class=\"wp-block-heading\">ASP 30: A\u00e7o de Metalurgia do P\u00f3 de Alto Desempenho<\/h3>\n\n\n\n<p class=\"wp-block-paragraph\">O ASP 30 \u00e9 um a\u00e7o de metalurgia do p\u00f3 de alta qualidade para servi\u00e7os severos, onde tanto a resist\u00eancia ao desgaste quanto a resist\u00eancia ao lascamento precisam ser aprimoradas simultaneamente. Sua estrutura de metalurgia do p\u00f3 minimiza a segrega\u00e7\u00e3o de carbonetos e proporciona uma microestrutura mais uniforme, o que resulta em melhor estabilidade de borda do que o a\u00e7o r\u00e1pido convencional em lingotes com n\u00edveis de dureza semelhantes.<\/p>\n\n\n\n<p class=\"wp-block-paragraph\">Isso torna o ASP 30 adequado para opera\u00e7\u00f5es exigentes de fresagem e brochamento, onde os a\u00e7os r\u00e1pidos padr\u00e3o sofrem com desgaste combinado e microlascamento. Nessas aplica\u00e7\u00f5es, o valor do ASP 30 reside n\u00e3o apenas na maior vida \u00fatil, mas tamb\u00e9m no desempenho mais previs\u00edvel e no menor risco de falha inst\u00e1vel da aresta de corte.<\/p>\n\n\n\n<p class=\"wp-block-paragraph\">Devido ao seu custo, o ASP 30 geralmente se justifica quando o tempo de inatividade das ferramentas, a frequ\u00eancia de reafia\u00e7\u00e3o ou a perda prematura de ferramentas representam uma clara penalidade de produ\u00e7\u00e3o. N\u00e3o \u00e9 a escolha padr\u00e3o para trabalhos de rotina; \u00e9 a solu\u00e7\u00e3o para opera\u00e7\u00f5es em que os a\u00e7os r\u00e1pidos convencionais n\u00e3o oferecem mais uma rela\u00e7\u00e3o custo-benef\u00edcio est\u00e1vel.<\/p>\n<\/div>\n\n\n\n<h2 class=\"wp-block-heading\">Tabela Resumo<\/h2>\n\n\n\n<figure class=\"wp-block-table\"><table class=\"has-fixed-layout\"><tbody><tr><td>A\u00e7o ferramenta de alta qualidade<\/td><td>Dureza t\u00edpica<\/td><td>Vantagem prim\u00e1ria<\/td><\/tr><tr><td>M2<\/td><td>64\u201366 HRC<\/td><td>Melhor equil\u00edbrio geral entre resist\u00eancia, durabilidade e custo.<\/td><\/tr><tr><td>M3 (Cl 2) \/ M4<\/td><td>64\u201367 HRC<\/td><td>Maior resist\u00eancia ao desgaste para ciclos de opera\u00e7\u00e3o mais longos e condi\u00e7\u00f5es mais abrasivas.<\/td><\/tr><tr><td>T15<\/td><td>66\u201368 HRC<\/td><td>Alta dureza a quente e resist\u00eancia \u00e0 abras\u00e3o para corte em altas temperaturas.<\/td><\/tr><tr><td>M42<\/td><td>At\u00e9 69 HRC<\/td><td>Alta dureza a quente para ligas resistentes ao calor e de alta resist\u00eancia.<\/td><\/tr><tr><td>ASP 30 (P\/M)<\/td><td>65\u201367 HRC<\/td><td>Resist\u00eancia superior ao desgaste e lascamento com melhor uniformidade estrutural.<\/td><\/tr><\/tbody><\/table><\/figure>\n<\/div><\/div>","protected":false},"excerpt":{"rendered":"<p>Selection of Tool Steel for Hobs and Broaches Hobs are rotary cutting tools used to generate gear teeth and other repeated forms, while broaches are linear multi-tooth tools that remove material in a single pass by means of progressively higher teeth. Despite this difference in motion, both are cutting tools that work under high localized [&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":"default","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":"set","ast-page-background-enabled":"default","ast-page-background-meta":{"desktop":{"background-color":"","background-image":"","background-repeat":"repeat","background-position":"center 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