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A maior vantagem do sem-fim de duplo avanço é poder restaurar a folga após desgaste deslocando o sem-fim axialmente. No mês passado ajudámos um cliente de equipamentos de posicionamento a ajustar um redutor de 0,12 mm para 0,03 mm; a precisão recuperou.
1. Descrição do problema
O equipamento faz posicionamento de precisão; a folga de retorno tinha de ficar dentro de 0,03 mm. Após dois anos, o posicionamento piorou e a folga aumentou.
Na abertura, desgaste normal sem dano grave. Não era preciso trocar peças — bastava ajustar a folga.
2. Processo de ajuste
Passo 1: medir a folga atual. Fixar o sem-fim, apoiar o comparador no bordo da coroa e oscilar; a leitura é o jogo de retorno. O cliente mediu 0,12 mm — cerca de quatro vezes o valor novo.
Passo 2: folgar as porcas de bloqueio do suporte do sem-fim. Não as retirar por completo — só o suficiente para movimento axial.
Passo 3: bater de leve na extremidade com punção de cobre e deslocar axialmente cerca de 0,02 mm de cada vez.
Passo 4: após cada movimento, medir de novo. Parar por volta de 0,03 mm.
3. Verificações após o ajuste
Com a folga definida, verificar também:
– Giro manual suave sem emperramento
– Mancha de contacto a meio do flanco
– Folga inalterada após apertar as porcas
Após ensaio, a precisão voltou ao nível de equipamento novo sem troca de peças, com poupança de custo.
4. Precauções
Menor nem sempre é melhor. Se a 0,03 mm o giro ficar claramente duro, foi longe demais — afrouxar um pouco. Folga demasiado pequena prejudica a lubrificação, sobe a temperatura e encurta a vida.
Sem-fim e coroa de duplo avanço devem ser usados em par e não são intercambiáveis. A Dezhou Xinmi Machinery maquiniza esses pares e aceita desenhos ou amostras.
