Processing Machinery
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PPS Metal Insert Preheating
Problembeschreibung
PPS parts with metal inserts crack around the inserts and fail after thermal cycling
Ursachenanalyse
The thermal expansion coefficients of metal and PPS differ greatly; cooling shrinkage after high-temperature molding generates tensile stress around the insert; when the insert is not preheated, interfacial rapid-cooling stress is higher; during on-site troubleshooting, verify item by item according to this mechanism, and avoid blindly adjusting the machine based on experience alone
Lösung
①Preheat inserts to 120-150°C before molding; ②Thicken and round the wall around the insert; ③Verify under thermal cycling conditions; after adjustment, take continuous samples to verify the effect, and resume mass production only after confirming stability
Wichtigste Erkenntnis
PPS insert preheating is a supporting process for high-temperature molding; 120-150°C preheating eliminates interfacial stress concentration; after confirming effectiveness, fix the parameters and practices into the work instruction to prevent recurrence
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