Extrusion & Post
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POM Annealing Post-treatment
Problem Phenomenon
After assembly, high-precision POM parts slowly change in dimension, with fit clearances out of tolerance
Cause Analysis
After demolding, POM continues crystallizing with large post-shrinkage and high internal stress; thick-walled parts are especially obvious, and untreated precision parts drift in dimension over time; during on-site troubleshooting, verify item by item according to this mechanism, and avoid blindly adjusting the machine based only on experience
Solution
①For thickness below 6mm, anneal at 100℃×0.25-1h; ②for above 6mm, 120-130℃×4-6h; ③cool slowly after annealing and re-inspect dimensions
Key Takeaway
Annealing is the standard post-treatment for precision POM parts; temperature-time combinations graded by thickness lock dimensions in a stable state; after confirming effectiveness, solidify the parameters and practices into the work instruction to prevent recurrence
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