Processing Machinery
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PA66 insert cracking
Fenómeno do problema
Cracks appear around the inserts of PA66 copper-insert products
Análise das causas
Copper and PA66 have large expansion coefficient differences, and cooling shrinkage produces circumferential tensile stress; low insert temperature aggravates stress; during on-site troubleshooting, verify item by item according to this mechanism, avoiding blindly adjusting the machine based only on experience
Solução
Preheat inserts to 120-150℃; sufficient plastic wall thickness around inserts; anneal after molding to release stress; after adjustment, take continuous samples to verify the effect, confirm stability before resuming mass production
Conclusão principal
Insert cracking is controlled by three layers: preheating, wall thickness, and annealing; after confirming effectiveness, fix the parameters and practices into the work instructions to prevent recurrence; include this case in the defect archive as a troubleshooting reference for subsequent similar problems
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