Molds & Tooling
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PA6 Uneven Mold Temperature Countermeasures
Problem Phenomenon
Products at different positions in the same cavity show large shrinkage differences, out-of-tolerance dimensions, and warpage
Cause Analysis
The mold water circuit layout is unreasonable or some water circuits are blocked, the cavity surface temperature difference exceeds 10°C, and uneven cooling shrinkage causes dimensional differences and internal stress warpage; when troubleshooting on site, verify item by item according to this mechanism, and avoid blindly adjusting the machine based only on experience
Solution
Test the cavity surface temperature distribution and control the temperature difference within ±5°C; clean the scale in the water circuits to ensure flow, and when necessary add water circuits or switch to conformal water circuit design; after adjustment, continuously sample to verify the effect, and resume mass production after confirming stability
Key Takeaway
Mold temperature uniformity affects dimensional stability more than the absolute mold temperature value; check the water circuits first and then adjust the temperature; after confirming effectiveness, fix the parameters and practices into the work instructions to prevent recurrence
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