Processing Machinery
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PPS Metal Insert Preheating
Problem Phenomenon
PPS parts with metal inserts crack around the inserts and fail after thermal cycling
Cause Analysis
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
Solution
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
Key Takeaway
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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