Molds & Tooling
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PA66 mold temperature uniformity
Problem Phenomenon
PA66 same mold different cavities product dimensions differ greatly
Cause Analysis
Multi-cavity mold water line design unbalanced, cavity mold temperature differences cause inconsistent shrinkage, PA66 crystallization shrinkage is large and sensitive to mold temperature; during on-site troubleshooting, verify item by item according to this mechanism, and avoid blindly adjusting the machine based solely on experience
Solution
Multi-cavity mold water lines designed equal-length equal-resistance; measured cavity surface temperatures controlled within ±3℃; regularly clean water lines to ensure consistent flow; after adjustment, continuously sample to verify the effect, and resume mass production only after confirming stability
Key Takeaway
Multi-cavity dimensional consistency relies first on water line balance, measured mold temperature is the means; after confirming effectiveness, fix the parameters and practices into the work instruction to prevent recurrence; include this case in the defect archive as a troubleshooting reference for subsequent similar problems
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