Molding Process
8 visualizações
PA6 Thick-Wall Sink Marks and Burnt
Fenómeno do problema
Sink marks and vacuum voids appear in products with wall thickness above 6mm, and there are even burnt marks in the thick-wall center
Análise das causas
PA6 crystallization and solidification cause large volume shrinkage, and insufficient feeding compensation in the thick-wall zone forms sink marks and vacuum voids; heat dissipation inside the thick wall is slow, and accumulated shear heat may also cause local overheating and burnt
Solução
①Increase holding pressure and time to compensate for volume shrinkage; ②Strengthen cooling in the thick-wall zone and optimize the gate holding channel; ③Control melt temperature to prevent shear heat accumulation; after adjustment, continuously sample to verify the effect, and resume mass production only after confirming stability
Conclusão principal
Thick-wall PA6 parts need prevention of both sink marks and overheating; holding compensation and cooling enhancement work in both directions, and the gate channel is the throat of feeding compensation; after confirming effectiveness, solidify the parameters and practices into the work instruction to prevent recurrence
Isto foi útil?
0 pessoas acharam isto útil
Obrigado pelo seu comentário!