New analytical formulation for torque specification of bolted joints considering external taper thread and internal parallel metric thread

Alexandre da Silva Scari

doi:10.35819/remat2025v11id7620

Autores

Alexandre da Silva Scari Universidade Federal de Minas Gerais (UFMG), Departamento de Engenharia Mecânica (DEMEC), Belo Horizonte, Minas Gerais, Brasil https://orcid.org/0000-0002-7000-2998

DOI:

https://doi.org/10.35819/remat2025v11id7620

Palavras-chave:

uniões aparafusadas, roscas métricas cônica e paralela, comprimento de filetes em presa, determinação do torque de aperto

Resumo

Especificar e aplicar o torque de aperto correto para se atingir a força de tração requerida é essencial para se obter uma união aparafusada por atrito confiável. Para evitar falha de qualquer componente e/ou o auto-desaparafusamento, o comprimento efetivo de filetes engajados é de suma importância. As formulações analíticas disponíveis para essas aplicações contemplam a união de roscas métricas paralelas, internas e externas. Entretanto, não há formulação analítica para rosca externa cônica com rosca interna paralela. Sendo assim, o presente trabalho desenvolve um procedimento analítico para determinar o comprimento mínimo de filetes engajados, a porcentagem da máxima força de montagem que o primeiro filete engajado suporta e, assim, determinar o torque de montagem de rosca externa métrica cônica com rosca interna paralela. Os resultados mostraram que, nesse caso, somente um pequeno número de filetes efetivamente se conecta e o 1º filete suporta a maior parte da força de tração requerida (aproximadamente 35%). Para ilustrar esse procedimento, um exemplo resolvido é apresentado no final do artigo.

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Biografia do Autor

Alexandre da Silva Scari, Universidade Federal de Minas Gerais (UFMG), Departamento de Engenharia Mecânica (DEMEC), Belo Horizonte, Minas Gerais, Brasil

http://lattes.cnpq.br/3174658439791409

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