{"id":1358,"date":"2025-05-23T14:14:16","date_gmt":"2025-05-23T06:14:16","guid":{"rendered":"https:\/\/old.jbrplas.com\/?p=1358"},"modified":"2025-05-23T14:14:18","modified_gmt":"2025-05-23T06:14:18","slug":"basics-of-plastic-mold-knowledge","status":"publish","type":"post","link":"https:\/\/old.jbrplas.com\/pt\/basics-of-plastic-mold-knowledge\/","title":{"rendered":"No\u00e7\u00f5es b\u00e1sicas de conhecimento sobre moldes de pl\u00e1stico"},"content":{"rendered":"<h4 class=\"wp-block-heading\" id=\"i-definition-of-mold\"><strong>I. Defini\u00e7\u00e3o de bolor<\/strong><\/h4>\n\n\n\n<ul class=\"wp-block-list\">\n<li><strong>Molde<\/strong>: Uma ferramenta que molda materiais em produtos com dimens\u00f5es espec\u00edficas. Determina a qualidade e o custo de fabrico, servindo de ferramenta central para a produ\u00e7\u00e3o em massa, sendo frequentemente referida como a \"M\u00e3e dos Produtos\".<\/li>\n<\/ul>\n\n\n\n<h4 class=\"wp-block-heading\" id=\"ii-overview-of-plastic-injection-molds\"><strong>II. Vis\u00e3o geral dos moldes de inje\u00e7\u00e3o de pl\u00e1stico<\/strong><\/h4>\n\n\n\n<ol start=\"1\" class=\"wp-block-list\">\n<li><strong>Princ\u00edpio de funcionamento<\/strong>\n<ul class=\"wp-block-list\">\n<li><strong>Processo de inje\u00e7\u00e3o<\/strong>: Fixa\u00e7\u00e3o \u2192 Plastifica\u00e7\u00e3o (alimenta\u00e7\u00e3o, descompress\u00e3o) \u2192 Inje\u00e7\u00e3o (enchimento, embalagem) \u2192 Arrefecimento \u2192 Eje\u00e7\u00e3o.<\/li>\n<\/ul>\n<\/li>\n\n\n\n<li><strong>Tend\u00eancias de desenvolvimento<\/strong>\n<ul class=\"wp-block-list\">\n<li>Moldes maiores, requisitos de precis\u00e3o mais elevados, moldes compostos multifuncionais.<\/li>\n\n\n\n<li>Aumento da utiliza\u00e7\u00e3o de sistemas de canais quentes, normaliza\u00e7\u00e3o de componentes e integra\u00e7\u00e3o tecnol\u00f3gica avan\u00e7ada.<\/li>\n<\/ul>\n<\/li>\n<\/ol>\n\n\n\n<h4 class=\"wp-block-heading\" id=\"iii-classification-and-applications-of-plastic-molds\"><strong>III. Classifica\u00e7\u00e3o e aplica\u00e7\u00f5es dos moldes de pl\u00e1stico<\/strong><\/h4>\n\n\n\n<ol start=\"1\" class=\"wp-block-list\">\n<li><strong>Molde de duas placas<\/strong>\n<ul class=\"wp-block-list\">\n<li><strong>Estrutura<\/strong>: Separa\u00e7\u00e3o direta de moldes macho e f\u00eamea. Adequado para port\u00f5es diretos de cavidade \u00fanica ou port\u00f5es de borda de m\u00faltiplas cavidades.<\/li>\n\n\n\n<li><strong>Aplica\u00e7\u00f5es<\/strong>: Produtos simples, por exemplo, pe\u00e7as com portas de um ponto.<\/li>\n<\/ul>\n<\/li>\n\n\n\n<li><strong>Molde de tr\u00eas placas<\/strong>\n<ul class=\"wp-block-list\">\n<li><strong>Estrutura<\/strong>: Acrescenta uma placa de corredi\u00e7a para a separa\u00e7\u00e3o autom\u00e1tica do port\u00e3o. Adequado para port\u00f5es multiponto (port\u00f5es de ponto fixo).<\/li>\n\n\n\n<li><strong>Aplica\u00e7\u00f5es<\/strong>: Produtos complexos que requerem um corte autom\u00e1tico do port\u00e3o.<\/li>\n<\/ul>\n<\/li>\n\n\n\n<li><strong>Molde de duas placas e meia<\/strong>\n<ul class=\"wp-block-list\">\n<li><strong>Carater\u00edsticas<\/strong>: Sistema de canais aquecidos para manter o pl\u00e1stico fundido, reduzindo os res\u00edduos e a press\u00e3o de inje\u00e7\u00e3o.<\/li>\n<\/ul>\n<\/li>\n\n\n\n<li><strong>Sistema de canais quentes<\/strong>\n<ul class=\"wp-block-list\">\n<li><strong>Vantagens<\/strong>:\n<ul class=\"wp-block-list\">\n<li>Reduz o tempo de ciclo, melhora a efici\u00eancia;<\/li>\n\n\n\n<li>Reduz o desperd\u00edcio de material;<\/li>\n\n\n\n<li>Reduz a press\u00e3o de inje\u00e7\u00e3o, melhora a qualidade do produto.<\/li>\n<\/ul>\n<\/li>\n\n\n\n<li><strong>Componentes<\/strong>: Bicos quentes, coletor, controlador de temperatura, sequenciador de porta de v\u00e1lvula.<\/li>\n<\/ul>\n<\/li>\n<\/ol>\n\n\n\n<div class=\"wp-block-greenshift-blocks-image gspb_image gspb_image-id-gsbp-7e44e40\" id=\"gspb_image-id-gsbp-7e44e40\"><img decoding=\"async\" src=\"https:\/\/old.jbrplas.com\/wp-content\/uploads\/2025\/05\/mold.webp\" data-src=\"\" alt=\"\" loading=\"lazy\" width=\"543\" height=\"651\"\/><\/div>\n\n\n\n<h4 class=\"wp-block-heading\" id=\"iv-key-components-functions-and-layout\"><strong>IV. Componentes principais: Fun\u00e7\u00f5es e disposi\u00e7\u00e3o<\/strong><\/h4>\n\n\n\n<ol start=\"1\" class=\"wp-block-list\">\n<li><strong>Pinos de guia (G.P.)<\/strong>\n<ul class=\"wp-block-list\">\n<li><strong>Fun\u00e7\u00e3o<\/strong>: Assegure o alinhamento exato dos moldes macho e f\u00eamea para evitar danos no n\u00facleo.<\/li>\n\n\n\n<li><strong>Coloca\u00e7\u00e3o<\/strong>: Simetricamente nos quatro cantos; buchas de guia no molde f\u00eamea, pinos no molde macho; inclui ranhuras de ventila\u00e7\u00e3o.<\/li>\n<\/ul>\n<\/li>\n\n\n\n<li><strong>Pinos de guia do ejetor (E.G.P)<\/strong>\n<ul class=\"wp-block-list\">\n<li><strong>Fun\u00e7\u00e3o<\/strong>: Guiar o movimento das placas ejectoras.<\/li>\n\n\n\n<li><strong>Quantidade<\/strong>: Normalmente 4 (2 para moldes pequenos), colocados perto dos pinos de retorno (R.P.).<\/li>\n<\/ul>\n<\/li>\n\n\n\n<li><strong>Pilares de apoio (P.S.)<\/strong>\n<ul class=\"wp-block-list\">\n<li><strong>Fun\u00e7\u00e3o<\/strong>: Refor\u00e7a a resist\u00eancia da placa do molde macho, evita a deforma\u00e7\u00e3o da placa ejectora.<\/li>\n\n\n\n<li><strong>Coloca\u00e7\u00e3o<\/strong>: Perto de zonas de inje\u00e7\u00e3o de alta press\u00e3o, evitando interfer\u00eancias com outros componentes.<\/li>\n<\/ul>\n<\/li>\n\n\n\n<li><strong>Pinos de rolha (STP)<\/strong>\n<ul class=\"wp-block-list\">\n<li><strong>Fun\u00e7\u00e3o<\/strong>: Alinhe o bico de inje\u00e7\u00e3o com o casquilho do jito, reduzindo o tempo de prepara\u00e7\u00e3o.<\/li>\n\n\n\n<li><strong>Especifica\u00e7\u00f5es<\/strong>: Di\u00e2metro de \u03a6100 (moldes pequenos) a \u03a6150 (moldes grandes), com toler\u00e2ncia (-0,10\/-0,30 mm).<\/li>\n<\/ul>\n<\/li>\n\n\n\n<li><strong>Anel de fixa\u00e7\u00e3o e casquilho do canal de entrada<\/strong>\n<ul class=\"wp-block-list\">\n<li><strong>Anel de localiza\u00e7\u00e3o<\/strong>: Assegura o alinhamento do bico com o canal do molde.<\/li>\n\n\n\n<li><strong>Casquilho de canal de entrada<\/strong>: Tratada termicamente para resist\u00eancia ao desgaste; as corredi\u00e7as requerem \u00e2ngulos de inclina\u00e7\u00e3o.<\/li>\n<\/ul>\n<\/li>\n\n\n\n<li><strong>Pequenas hastes de tra\u00e7\u00e3o e fechos de molde<\/strong>\n<ul class=\"wp-block-list\">\n<li><strong>Hastes de tra\u00e7\u00e3o pequenas<\/strong>: Utilize fric\u00e7\u00e3o de nylon para o bloqueio, adequado para moldes de baixo volume ou de baixa temperatura.<\/li>\n\n\n\n<li><strong>Fechaduras de molde<\/strong>: Inclui tipos de resina (alta durabilidade) e tipos mec\u00e2nicos para moldes grandes ou de precis\u00e3o.<\/li>\n<\/ul>\n<\/li>\n<\/ol>\n\n\n\n<h4 class=\"wp-block-heading\" id=\"v-injection-machine-selection-and-guidelines\"><strong>V. Sele\u00e7\u00e3o da m\u00e1quina de inje\u00e7\u00e3o e orienta\u00e7\u00f5es<\/strong><\/h4>\n\n\n\n<div class=\"wp-block-greenshift-blocks-image gspb_image gspb_image-id-gsbp-21fb5c2\" id=\"gspb_image-id-gsbp-21fb5c2\"><img decoding=\"async\" src=\"https:\/\/old.jbrplas.com\/wp-content\/uploads\/2025\/05\/injection-molding-1.gif\" data-src=\"\" alt=\"\" loading=\"lazy\" width=\"556\" height=\"208\"\/><\/div>\n\n\n\n<ol start=\"1\" class=\"wp-block-list\">\n<li><strong>C\u00e1lculo da for\u00e7a de aperto<\/strong>\n<ul class=\"wp-block-list\">\n<li><strong>F\u00f3rmula<\/strong>: For\u00e7a de aperto (T) = 330 kg\/cm2 \u00d7 Comprimento do produto (cm) \u00d7 Largura do produto (cm) \u00d7 1,5 \/ 1000<\/li>\n\n\n\n<li><strong>Sele\u00e7\u00e3o<\/strong>: A tonelagem da m\u00e1quina deve exceder o valor calculado; assegure a compatibilidade com a espessura do molde e o espa\u00e7amento dos tirantes.<\/li>\n<\/ul>\n<\/li>\n\n\n\n<li><strong>Orif\u00edcios de elimina\u00e7\u00e3o (KO) e Orif\u00edcios de eleva\u00e7\u00e3o<\/strong>\n<ul class=\"wp-block-list\">\n<li><strong>Buracos KO<\/strong>: Deve alinhar-se com o casquilho do jito; n\u00e3o s\u00e3o permitidos desvios de posi\u00e7\u00e3o.<\/li>\n\n\n\n<li><strong>Orif\u00edcios de eleva\u00e7\u00e3o<\/strong>: Dimensionado com base no peso do molde; os moldes grandes requerem orif\u00edcios em todos os lados.<\/li>\n<\/ul>\n<\/li>\n<\/ol>\n\n\n\n<h4 class=\"wp-block-heading\" id=\"vi-additional-notes\"><strong>VI. Notas adicionais<\/strong><\/h4>\n\n\n\n<ul class=\"wp-block-list\">\n<li><strong>Manuten\u00e7\u00e3o<\/strong>: Inspeccione regularmente o desgaste dos pinos-guia, dos pinos ejectores, etc.<\/li>\n\n\n\n<li><strong>Controlo de canais quentes<\/strong>: Controlo rigoroso da temperatura para evitar o entupimento ou a degrada\u00e7\u00e3o do material.<\/li>\n<\/ul>","protected":false},"excerpt":{"rendered":"<p>I. Defini\u00e7\u00e3o de molde II. Vis\u00e3o Geral dos Moldes de Inje\u00e7\u00e3o de Pl\u00e1stico III. Classifica\u00e7\u00e3o e Aplica\u00e7\u00f5es dos Moldes de Pl\u00e1stico IV. Componentes chave: Fun\u00e7\u00f5es e Disposi\u00e7\u00e3o V. Sele\u00e7\u00e3o da M\u00e1quina de Inje\u00e7\u00e3o e Orienta\u00e7\u00f5es VI. Notas Adicionais<\/p>","protected":false},"author":1,"featured_media":1364,"comment_status":"closed","ping_status":"open","sticky":false,"template":"","format":"standard","meta":{"_gspb_post_css":"#gspb_image-id-gsbp-21fb5c2,#gspb_image-id-gsbp-7e44e40{text-align:center}#gspb_image-id-gsbp-21fb5c2 img,#gspb_image-id-gsbp-7e44e40 img{vertical-align:top;display:inline-block;box-sizing:border-box;max-width:100%;height:auto}","footnotes":""},"categories":[19],"tags":[],"class_list":["post-1358","post","type-post","status-publish","format-standard","has-post-thumbnail","hentry","category-technology"],"blocksy_meta":[],"aioseo_notices":[],"_links":{"self":[{"href":"https:\/\/old.jbrplas.com\/pt\/wp-json\/wp\/v2\/posts\/1358","targetHints":{"allow":["GET"]}}],"collection":[{"href":"https:\/\/old.jbrplas.com\/pt\/wp-json\/wp\/v2\/posts"}],"about":[{"href":"https:\/\/old.jbrplas.com\/pt\/wp-json\/wp\/v2\/types\/post"}],"author":[{"embeddable":true,"href":"https:\/\/old.jbrplas.com\/pt\/wp-json\/wp\/v2\/users\/1"}],"replies":[{"embeddable":true,"href":"https:\/\/old.jbrplas.com\/pt\/wp-json\/wp\/v2\/comments?post=1358"}],"version-history":[{"count":3,"href":"https:\/\/old.jbrplas.com\/pt\/wp-json\/wp\/v2\/posts\/1358\/revisions"}],"predecessor-version":[{"id":1365,"href":"https:\/\/old.jbrplas.com\/pt\/wp-json\/wp\/v2\/posts\/1358\/revisions\/1365"}],"wp:featuredmedia":[{"embeddable":true,"href":"https:\/\/old.jbrplas.com\/pt\/wp-json\/wp\/v2\/media\/1364"}],"wp:attachment":[{"href":"https:\/\/old.jbrplas.com\/pt\/wp-json\/wp\/v2\/media?parent=1358"}],"wp:term":[{"taxonomy":"category","embeddable":true,"href":"https:\/\/old.jbrplas.com\/pt\/wp-json\/wp\/v2\/categories?post=1358"},{"taxonomy":"post_tag","embeddable":true,"href":"https:\/\/old.jbrplas.com\/pt\/wp-json\/wp\/v2\/tags?post=1358"}],"curies":[{"name":"wp","href":"https:\/\/api.w.org\/{rel}","templated":true}]}}