Processing Machinery
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PA66 product shrinkage rate out of tolerance
Problem Phenomenon
Overall dimensional deviation, poor assembly.
Cause Analysis
Shrinkage 1.5%~2.5% value selection improper; holding has great influence; wall thickness differences also cause deviation; during on-site troubleshooting, verify item by item according to this mechanism, and avoid blindly adjusting the machine based solely on experience.
Solution
①Measure actually and repair the mold; ②optimize holding pressure and switchover point, taking into account both feeding and internal stress; ③unify measurement state; ④measure shrinkage by wall thickness and repair the mold with differentiated compensation; ⑤use CAE analysis to assist decision-making when necessary.
Key Takeaway
PA66 dimension='measured correction': shrinkage rate measured by wall thickness, differentiated compensation; unified measurement state is the premise; after confirming effectiveness, fix the parameters and practices into the work instruction to prevent recurrence.
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