Production & Quality
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PA6 and PA12 Selection
Fenómeno del problema
Precision PA6 parts used in humid environments show dimensional drift exceeding the standard, and assembly jams
Análisis de la causa
PA6's equilibrium water absorption of 2.8% brings 0.5-1% dimensional expansion, causing precision fits to fail in humid environments; PA12 absorbs only 0.25% water, with dimensions almost unchanged with humidity, but the price is 3-5 times higher
Solución
①Switch precision parts in humid environments to PA12; ②PA6 parts are used after pre-stabilizing dimensions through conditioning; ③evaluate the material price difference by full life cycle quality cost; after adjustment, continuously sample to verify the effect, and resume mass production after confirming stability
Conclusión clave
Humidity dimensional stability is the watershed between PA6 and PA12; conditioning pretreatment can alleviate it, but the premium of PA12 is worth the money in high-precision scenarios; after confirming effectiveness, fix the parameters and practices into the work instructions to prevent recurrence
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