Molds & Tooling
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POM Warpage from Uneven Cooling
Problem Phenomenon
The part warps and deforms, dimensions continue to change over time, and assembly gaps are uneven
Cause Analysis
POM's high crystallization shrinkage is sensitive to uneven cooling; uneven wall thickness and unbalanced cooling cause shrinkage differences; post-crystallization causes dimensions to continue drifting after demolding; during on-site troubleshooting, verify item by item according to this mechanism, and avoid blindly adjusting the machine based only on experience
Solution
①Check wall thickness transitions and cooling layout at the DFM stage; ②optimize the holding pressure window for feeding uniformity; ③for precision parts, perform full-dimensional CMM measurement of T1 samples before mold correction
Key Takeaway
POM warpage control starts from DFM; cooling balance and holding pressure window are the process mainline, and dimensional drift is backstopped by post-treatment; after confirming effectiveness, solidify the parameters and practices into the work instruction to prevent recurrence
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