Material Drying
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POM Dimensional Drift
Problem Phenomenon
After storage, POM precision parts change in dimension beyond tolerance
Cause Analysis
Post-crystallization and moisture absorption act together; as-molded dimensions are not final dimensions; during on-site troubleshooting, verify item by item according to this mechanism, and avoid blindly adjusting the machine based only on experience; this mechanism has been repeatedly verified by industry literature and should be confirmed first during troubleshooting
Solution
High mold temperature for sufficient crystallization; test precision parts after aging; note the test state on the drawing; after adjustment, take continuous samples to verify the effect, and resume mass production only after confirming stability; change only one variable at a time and record parameter changes to facilitate locating effective measures
Key Takeaway
Precision part dimensions are based on the post-aging state; after confirming effectiveness, solidify 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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