{"id":17256,"date":"2024-03-19T18:16:17","date_gmt":"2024-03-19T10:16:17","guid":{"rendered":"https:\/\/firstmold.com\/?post_type=case-study&#038;p=17256"},"modified":"2026-03-30T11:29:23","modified_gmt":"2026-03-30T03:29:23","slug":"fuse-bracket-manufacturing","status":"publish","type":"case-study","link":"https:\/\/firstmold.com\/pt\/case-study\/fuse-bracket-manufacturing\/","title":{"rendered":"Fabrico de suportes de fus\u00edveis por moldagem por inser\u00e7\u00e3o"},"content":{"rendered":"<p>Um suporte de fus\u00edvel, tamb\u00e9m designado por suporte de fus\u00edvel ou bloco de fus\u00edvel, \u00e9 um alojamento seguro para um fus\u00edvel num circuito el\u00e9trico. O principal objetivo do fabrico de suportes de fus\u00edveis \u00e9 manter o fus\u00edvel no lugar, de forma segura. Isto proporciona o isolamento el\u00e9trico necess\u00e1rio para proteger o pessoal e o equipamento de falhas el\u00e9ctricas como curto-circuitos, sobreaquecimento ou sobreintensidade.<\/p>\n\n\n\n<p>Existem diferentes tipos de suportes de fus\u00edveis, incluindo suportes de fus\u00edveis montados em pain\u00e9is, montados em placas de circuitos impressos (PCB), suportes de fus\u00edveis com chumbo, suportes de fus\u00edveis em carris e suportes de fus\u00edveis para autom\u00f3veis. O tipo de suporte \u00e9 normalmente determinado pela aplica\u00e7\u00e3o pretendida. As principais fun\u00e7\u00f5es de um suporte de fus\u00edvel de pl\u00e1stico incluem:<\/p>\n\n\n\n<ul class=\"wp-block-list\">\n<li><strong><em>Proporciona uma montagem e liga\u00e7\u00e3o seguras:<\/em><\/strong> Fornece uma base est\u00e1vel que mant\u00e9m o fus\u00edvel firmemente ligado \u00e0 via el\u00e9ctrica e evita que se solte devido a factores externos ou vibra\u00e7\u00f5es.<\/li>\n\n\n\n<li><strong><em>Serve como isolante el\u00e9trico para seguran\u00e7a:<\/em><\/strong> O fabrico de pe\u00e7as de fus\u00edveis (produ\u00e7\u00e3o em massa) \u00e9 normalmente feito utilizando pl\u00e1stico n\u00e3o condutor e resistente ao calor que isola os componentes el\u00e9ctricos sob tens\u00e3o para evitar curto-circuitos e choques el\u00e9ctricos acidentais.<\/li>\n\n\n\n<li><strong><em>Facilita a manuten\u00e7\u00e3o e a substitui\u00e7\u00e3o:<\/em><\/strong> Os t\u00e9cnicos podem aceder facilmente a um fus\u00edvel queimado atrav\u00e9s do suporte para o substituir. Isto minimiza o tempo de inatividade da repara\u00e7\u00e3o do circuito.<\/li>\n\n\n\n<li><strong><em>Prote\u00e7\u00e3o contra os elementos ambientais:<\/em><\/strong> O fabrico de suportes de fus\u00edveis \u00e9 essencialmente concebido para vedar o fus\u00edvel contra a humidade, o p\u00f3 e a corros\u00e3o. Isto permite-lhes ser utilizados em condi\u00e7\u00f5es adversas.<\/li>\n\n\n\n<li><strong><em>Melhor organiza\u00e7\u00e3o para v\u00e1rios fus\u00edveis:<\/em><\/strong> Em aplica\u00e7\u00f5es como a ind\u00fastria autom\u00f3vel, onde s\u00e3o necess\u00e1rios v\u00e1rios fus\u00edveis, um suporte de fus\u00edveis ajuda a centralizar os diferentes fus\u00edveis para uma melhor gest\u00e3o de v\u00e1rios circuitos.<\/li>\n<\/ul>\n\n\n\n<p>H\u00e1 muitas aplica\u00e7\u00f5es que requerem a produ\u00e7\u00e3o de suportes de fus\u00edveis, incluindo autom\u00f3veis, maquinaria industrial, electrodom\u00e9sticos e sistemas de energia renov\u00e1vel. Fornecem solu\u00e7\u00f5es econ\u00f3micas e duradouras para curtos-circuitos e outras falhas el\u00e9ctricas.<\/p>\n\n\n\n<h2 class=\"wp-block-heading\" id=\"h-client-requirements\">Requisitos do cliente<\/h2>\n\n\n\n<p>Ap\u00f3s uma visita guiada \u00e0s instala\u00e7\u00f5es de produ\u00e7\u00e3o e \u00e0 tecnologia da First Mold, um fabricante de suportes de fus\u00edveis ficou convencido de que tinha encontrado o parceiro certo e sentou-se para discutir os pormenores do seu projeto. O cliente pretendia uma ferramenta de produ\u00e7\u00e3o em massa para o fabrico de pe\u00e7as de fus\u00edveis. Prev\u00ea-se que a ferramenta de a\u00e7o seja utilizada para moldar polibutileno tereftalato (PBT) em suportes de fus\u00edveis.<\/p>\n\n\n\n<p>O cliente pretendia especificamente a moldagem por inser\u00e7\u00e3o para o processo de fabrico. Nesta t\u00e9cnica de moldagem, os componentes met\u00e1licos, tais como terminais de a\u00e7o inoxid\u00e1vel, inser\u00e7\u00f5es roscadas ou barramentos, s\u00e3o colocados numa cavidade do molde antes da inje\u00e7\u00e3o do PBT fundido. Ap\u00f3s a inje\u00e7\u00e3o, o pl\u00e1stico encapsula as inser\u00e7\u00f5es para criar uma pe\u00e7a \u00fanica e dupla que combina metal condutor com um inv\u00f3lucro de pl\u00e1stico isolante.<\/p>\n\n\n\n<p>Outros requisitos cr\u00edticos mencionados pelo fabricante do suporte do fus\u00edvel incluem uma taxa de rendimento de produ\u00e7\u00e3o em massa \u226590%, tratamento de superf\u00edcie brilhante padr\u00e3o e uma toler\u00e2ncia de pe\u00e7a de \u00b10,05 mm. Cumprir a precis\u00e3o dimensional era fundamental para uma montagem sem falhas, um desafio constante que tinham com o seu anterior parceiro.<\/p>\n\n\n\n<h2 class=\"wp-block-heading\" id=\"h-challenges-and-solution\">Desafios e solu\u00e7\u00f5es<\/h2>\n\n\n\n<p>O Diretor de Produ\u00e7\u00e3o da First Mold, Bowen Huang, reuniu uma equipa de profissionais de ferramentas para debater os poss\u00edveis desafios do projeto e encontrar solu\u00e7\u00f5es adequadas para cada um deles. Havia desafios peculiares associados ao pedido do cliente. Por exemplo, a cria\u00e7\u00e3o de um molde de suporte de fus\u00edvel para moldagem por inser\u00e7\u00e3o requer mais aten\u00e7\u00e3o do que os moldes normais.<\/p>\n\n\n\n<p>Al\u00e9m disso, embora o PBT seja um termopl\u00e1stico de engenharia de alto desempenho com elevada for\u00e7a, rigidez e resist\u00eancia ao calor, sabe-se que tem uma elevada capacidade de absor\u00e7\u00e3o de \u00e1gua. Isto pode levar \u00e0 produ\u00e7\u00e3o de produtos defeituosos se o processo de produ\u00e7\u00e3o n\u00e3o for devidamente optimizado.<\/p>\n\n\n\n<h3 class=\"wp-block-heading\" id=\"h-insert-displacement-during-fuse-parts-manufacturing-mass-production\">Deslocamento da inser\u00e7\u00e3o durante o fabrico de pe\u00e7as de fus\u00edveis (produ\u00e7\u00e3o em massa)<\/h3>\n\n\n\n<p>Um dos maiores desafios no fabrico de suportes de fus\u00edveis atrav\u00e9s de moldagem por inser\u00e7\u00e3o \u00e9 a inclina\u00e7\u00e3o ou deslocamento da inser\u00e7\u00e3o pelo pl\u00e1stico fundido injetado. O mais pequeno dos deslocamentos pode levar ao encravamento da montagem ou a falhas funcionais. Quando n\u00e3o h\u00e1 forma de corrigir a desloca\u00e7\u00e3o, todo o lote ser\u00e1 eliminado.<\/p>\n\n\n\n<p>Ao contr\u00e1rio de outros fabricantes de moldes para pe\u00e7as fus\u00edveis, a equipa de engenheiros da First Mold resolveu o problema da desloca\u00e7\u00e3o da pastilha na fase de conce\u00e7\u00e3o do molde. O design inovador, facilitado por um software de ponta, levou a um desvio zero da posi\u00e7\u00e3o da pastilha na produ\u00e7\u00e3o em massa de pe\u00e7as de fus\u00edveis, eliminando a sucata na origem.<\/p>\n\n\n\n<h3 class=\"wp-block-heading\" id=\"h-challenge-with-molding-pbt-material\">Desafio com a moldagem de material PBT<\/h3>\n\n\n\n<p>Embora o PBT tenha v\u00e1rias vantagens desej\u00e1veis em rela\u00e7\u00e3o aos pl\u00e1sticos normais, enfrenta diferentes contratempos de moldagem, incluindo a r\u00e1pida cristaliza\u00e7\u00e3o, que pode levar a deforma\u00e7\u00f5es e retrac\u00e7\u00f5es elevadas e n\u00e3o uniformes, especialmente quando refor\u00e7ado com fibra de vidro.<\/p>\n\n\n\n<p>O material PBT tem uma elevada absor\u00e7\u00e3o de \u00e1gua e uma contra\u00e7\u00e3o dif\u00edcil de controlar. Al\u00e9m disso, a humidade pode quebrar a cadeia molecular do PBT a altas temperaturas. Isto torn\u00e1-lo-\u00e1 fr\u00e1gil, diminuir\u00e1 a sua resist\u00eancia e criar\u00e1 defeitos de superf\u00edcie, como manchas ou folgas. A deforma\u00e7\u00e3o do produto, as dimens\u00f5es fora da toler\u00e2ncia e a incapacidade de encaixar no equipamento do cliente s\u00e3o alguns dos desafios que podem resultar da humidade excessiva no PBT.<\/p>\n\n\n\n<p>A equipa de engenheiros da First Mold utilizou uma biblioteca de par\u00e2metros de moldagem por inje\u00e7\u00e3o especializada para PBT. Isto inclui a secagem a 110<sup>o<\/sup>C a 130<sup>o<\/sup>C durante 3 a 4 horas para baixar o teor de humidade para menos de 0,02%. A temperatura do molde para o fabrico do suporte do fus\u00edvel foi corretamente gerida em cerca de 70<sup>o<\/sup>C a 90<sup>o<\/sup>C para controlar a cristaliza\u00e7\u00e3o.<\/p>\n\n\n\n<p>Tanto o molde como o design do produto foram cuidadosamente considerados para evitar sec\u00e7\u00f5es espessas que poderiam levar a marcas de afundamento. Uma combina\u00e7\u00e3o de passos de otimiza\u00e7\u00e3o ajudou a First Mold a eliminar completamente o encolhimento, a deforma\u00e7\u00e3o e as bolhas, com dimens\u00f5es est\u00e1veis do 100%.<\/p>\n\n\n\n<h3 class=\"wp-block-heading\" id=\"h-tooling-challenge-for-single-cavity-mold-for-insert-molding\">Desafio de ferramentas para molde de cavidade \u00fanica para moldagem por inser\u00e7\u00e3o<\/h3>\n\n\n\n<p>Muitos fabricantes de moldes n\u00e3o t\u00eam experi\u00eancia na cria\u00e7\u00e3o de moldes de cavidade \u00fanica para moldagem por inser\u00e7\u00e3o. Embora o fabricante do suporte do fus\u00edvel tenha inicialmente sugerido um molde de m\u00faltiplas cavidades, a equipa de engenheiros da First Mold desaconselhou-o devido \u00e0 maior probabilidade de ocorr\u00eancia de defeitos.<\/p>\n\n\n\n<p>No entanto, a falta de experi\u00eancia na depura\u00e7\u00e3o de moldes de cavidade \u00fanica para o fabrico de suportes de fus\u00edveis pode levar a paragens de produ\u00e7\u00e3o frequentes, ajustes de moldes e altera\u00e7\u00f5es de materiais durante a produ\u00e7\u00e3o em massa, causando atrasos na entrega e custos descontrolados.<\/p>\n\n\n\n<p>A First Mold utilizou moldes de cavidade \u00fanica para obter a m\u00e1xima precis\u00e3o em vez de moldes de m\u00faltiplas cavidades. A equipa concentrou-se exclusivamente em componentes de seguran\u00e7a de controlo eletr\u00f3nico de alta qualidade, com uma precis\u00e3o muito superior aos moldes de m\u00faltiplas cavidades utilizados pelos concorrentes.<\/p>\n\n\n\n<h3 class=\"wp-block-heading\" id=\"h-insufficient-bonding-strength-between-the-plastic-and-metal-insert\">Resist\u00eancia de liga\u00e7\u00e3o insuficiente entre a inser\u00e7\u00e3o de pl\u00e1stico e de metal<\/h3>\n\n\n\n<p>Par\u00e2metros de moldagem incorrectos, contamina\u00e7\u00e3o da superf\u00edcie e falta de interbloqueio mec\u00e2nico s\u00e3o alguns dos factores que podem levar a uma liga\u00e7\u00e3o insuficiente entre o pl\u00e1stico e o metal na moldagem por inser\u00e7\u00e3o. Quando as pastilhas se soltam, rodam ou caem, criam riscos de seguran\u00e7a. Isto pode levar a devolu\u00e7\u00f5es diretas por parte dos clientes.<\/p>\n\n\n\n<p>A equipa de engenheiros da First Mold criou um processo de produ\u00e7\u00e3o em massa maduro para o fabrico de pe\u00e7as de fus\u00edveis atrav\u00e9s de moldagem por inser\u00e7\u00e3o que assegurou 72 horas de produ\u00e7\u00e3o est\u00e1vel cont\u00ednua, com uma taxa de rendimento de 93,2%+, muito acima da m\u00e9dia da ind\u00fastria. Este feito foi conseguido utilizando uma combina\u00e7\u00e3o de processos, incluindo:<\/p>\n\n\n\n<ul class=\"wp-block-list\">\n<li>Limpeza ou desengorduramento correto da pastilha utilizando um banho qu\u00edmico<\/li>\n\n\n\n<li>Pr\u00e9-aquecer o inserto a 80<sup>o<\/sup>C a 120<sup>o<\/sup>C para reduzir o choque t\u00e9rmico.<\/li>\n\n\n\n<li>Jato de areia na superf\u00edcie da pastilha para a tornar mais \u00e1spera e aumentar o encravamento<\/li>\n\n\n\n<li>Otimiza\u00e7\u00e3o dos par\u00e2metros de inje\u00e7\u00e3o, incluindo a velocidade de inje\u00e7\u00e3o, a press\u00e3o de reten\u00e7\u00e3o e o controlo da retra\u00e7\u00e3o<\/li>\n<\/ul>\n\n\n\n<h3 class=\"wp-block-heading\" id=\"h-poor-dimensional-consistency\">Fraca consist\u00eancia dimensional<\/h3>\n\n\n\n<p>Outra preocupa\u00e7\u00e3o do fabricante de suportes de fus\u00edveis era garantir que o produto tinha a precis\u00e3o dimensional correta. Uma fraca precis\u00e3o dimensional criar\u00e1 uma situa\u00e7\u00e3o em que as pe\u00e7as n\u00e3o podem cumprir os requisitos das linhas de montagem automatizadas e s\u00f3 s\u00e3o adequadas para uma montagem manual de baixo n\u00edvel.<\/p>\n\n\n\n<p>A First Mold implementou um controlo dimensional total do processo para alcan\u00e7ar um \u00cdndice de Compatibilidade do Processo (CPK) \u2265 1,325. O produto resultante era perfeitamente compat\u00edvel com linhas de montagem automatizadas para clientes de topo de gama.<\/p>\n\n\n\n<h2 class=\"wp-block-heading\" id=\"h-what-the-client-gained-with-first-mold-s-solutions\">O que o cliente ganhou com as solu\u00e7\u00f5es da First Mold<\/h2>\n\n\n\n<p>N\u00e3o nos limit\u00e1mos a enviar um molde de cavidade \u00fanica ao cliente. A First Mold forneceu uma ferramenta completa com documenta\u00e7\u00e3o para otimiza\u00e7\u00e3o do processo que assegura uma produ\u00e7\u00e3o consistente de suportes de fus\u00edveis de alta qualidade. Tirando partido das capacidades de hardware e software das nossas instala\u00e7\u00f5es, bem como de uma equipa de engenheiros com conhecimentos avan\u00e7ados em ferramentas de moldes, a First Mold entregou ao cliente o molde de produ\u00e7\u00e3o em massa para o fabrico de pe\u00e7as de fus\u00edveis em menos de tr\u00eas semanas.<\/p>\n\n\n\n<p>De acordo com o pedido do cliente para um acabamento de superf\u00edcie brilhante padr\u00e3o, come\u00e7\u00e1mos com o desbaste inicial utilizando pedras de \u00f3leo mais grossas antes de avan\u00e7armos para o polimento da superf\u00edcie do molde com gr\u00e3os mais finos de papel abrasivo. A obten\u00e7\u00e3o do acabamento de superf\u00edcie brilhante padr\u00e3o foi importante para o fabricante de pe\u00e7as de fus\u00edveis, pois poupou-lhe custos de p\u00f3s-produ\u00e7\u00e3o. Por outras palavras, os suportes dos fus\u00edveis estavam prontos para serem enviados ap\u00f3s a montagem.<\/p>\n\n\n\n<p>Ao trabalhar com a nossa equipa de fabricantes de moldes experientes, o cliente recebeu orienta\u00e7\u00e3o gratuita para redesenhar o molde de cavidade \u00fanica para moldagem por inser\u00e7\u00e3o, de modo a evitar a desloca\u00e7\u00e3o durante a inje\u00e7\u00e3o do pl\u00e1stico fundido. A resolu\u00e7\u00e3o deste problema de moldagem por inser\u00e7\u00e3o mais relatado garante ao cliente uma melhor taxa de rendimento e consist\u00eancia, muito mais do que os seus contactos anteriores propunham.<\/p>\n\n\n\n<p>Tal como todos os outros clientes com quem a First Mold trabalhou, o fabricante de suportes de fus\u00edveis usufruiu de apoio p\u00f3s-venda e de uma r\u00e1pida substitui\u00e7\u00e3o de pe\u00e7as, o que pode poupar mais custos a longo prazo atrav\u00e9s de tempos de inatividade operacionais mais curtos.<\/p>\n\n\n\n<h2 class=\"wp-block-heading\" id=\"h-faq\">FAQ<\/h2>\n\n\n\n<div class=\"schema-faq wp-block-yoast-faq-block\"><div class=\"schema-faq-section\" id=\"faq-question-1774840714600\"><strong class=\"schema-faq-question\">Qual \u00e9 o maior desafio da fabrica\u00e7\u00e3o de suportes de fus\u00edveis usando moldagem por inser\u00e7\u00e3o<\/strong> <p class=\"schema-faq-answer\">O desalinhamento e o deslocamento da pastilha sob inje\u00e7\u00e3o de alta press\u00e3o de pl\u00e1stico fundido, o empeno ou a fissura\u00e7\u00e3o por tens\u00e3o devido \u00e0 diferen\u00e7a dos coeficientes de expans\u00e3o t\u00e9rmica entre o pl\u00e1stico e os metais e a m\u00e1 liga\u00e7\u00e3o entre a pastilha e o pl\u00e1stico s\u00e3o os principais desafios que o fabricante de moldes tem de ultrapassar.<\/p> <\/div> <div class=\"schema-faq-section\" id=\"faq-question-1774840729097\"><strong class=\"schema-faq-question\">Como \u00e9 que se evita uma liga\u00e7\u00e3o deficiente na moldagem por inser\u00e7\u00e3o para o fabrico de pe\u00e7as de fus\u00edveis?<\/strong> <p class=\"schema-faq-answer\"><strong><em>Sele\u00e7\u00e3o de pol\u00edmero pl\u00e1stico e material met\u00e1lico compat\u00edveis:<\/em><\/strong> Certifique-se de que t\u00eam coeficientes de expans\u00e3o t\u00e9rmica semelhantes e utilize materiais com excelentes propriedades adesivas.<br><strong><em>Prepara\u00e7\u00e3o correta da pastilha:<\/em><\/strong> Limpar e desengordurar as pastilhas com \u00e1lcool ou produtos de limpeza ultra-s\u00f3nicos e tornar a superf\u00edcie da pastilha \u00e1spera para criar uma estrutura micro-porosa que melhore o encravamento mec\u00e2nico.<\/p> <\/div> <\/div>","protected":false},"excerpt":{"rendered":"<p>This study shows the molding manufacturer&#8217;s capabilities to manufacture perfect fuse bracket parts with precision insert injection molding.<\/p>","protected":false},"author":2,"featured_media":17258,"menu_order":0,"comment_status":"closed","ping_status":"closed","template":"","meta":{"_acf_changed":false,"inline_featured_image":false,"footnotes":""},"case-study-category":[66],"case-study-tag":[78],"class_list":["post-17256","case-study","type-case-study","status-publish","has-post-thumbnail","hentry","case-study-category-injection-molding-cases","case-study-tag-tools-and-equipment"],"acf":{"photo_gallery":{"case_study_gallery":[[{"id":17258,"title":"DC Circuit Fuse Holder by insert molding 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