Material Drying
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PA66 product corner chipping and edge breakage
Fenómeno del problema
Corners fall off during demolding, edges chip.
Análisis de la causa
Sharp corners + dry-state brittleness; fracture along sharp corners under ejection or external force; during on-site troubleshooting, verify item by item according to this mechanism, and avoid blindly adjusting the machine based solely on experience; during troubleshooting, confirm item by item around key factors such as corner chipping and sharp corners to avoid misjudgment.
Solución
①Change sharp corners to rounded transitions to eliminate stress concentration; ②condition before assembly to restore toughness and stabilize dimensions; ③slow down ejection speed to reduce ejection impact; ④structurally reinforce weak parts (fillets, reinforcing ribs); ⑤increase ejection area and reduce holding pressure to distribute and reduce ejection force.
Conclusión clave
PA66 corner chipping='sharp corner + dry state': rounded corners and conditioning on both fronts; nylon is brittle in dry state, sharp corners are the starting point of fracture; after confirming effectiveness, fix the parameters and practices into the work instruction to prevent recurrence.
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