Molds & Tooling
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PA66 weak weld lines
Fenómeno del problema
Weld lines crack, insufficient strength.
Análisis de la causa
Front convergence temperature insufficient, poor venting; high melting point makes the front cool faster and the convergence entanglement window shorter; during on-site troubleshooting, verify item by item according to this mechanism, and avoid blindly adjusting the machine based solely on experience.
Solución
①Raise melt temperature and mold temperature; ②open or clean vent grooves at the corresponding positions to ensure smooth gas discharge; ③increase injection speed to maintain melt front temperature and improve filling; ④adjust the gate so weld lines avoid stress-bearing areas; ⑤set overflow wells at the convergence to lead the cold front out of the cavity.
Conclusión clave
PA66 weld line='convergence temperature': high-melting-point nylon fronts cool fast, so convergence temperature must be given even more fully; position planning and venting are equally important; after confirming effectiveness, fix the parameters and practices into the work instruction to prevent recurrence.
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