Molds & Tooling
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POM Residual Stress Testing
Fenómeno del problema
POM parts crack without warning during use, and neither appearance nor dimensional inspection can detect it in advance
Análisis de la causa
POM internal stress is frozen in the part and is difficult to detect by conventional inspection; cracks initiate and propagate under load or environmental stress—a typical hidden failure; during on-site troubleshooting, verify item by item according to this mechanism, and avoid blindly adjusting the machine based only on experience
Solución
①Soak in 30% hydrochloric acid solution for 30 minutes for inspection; ②visually observe whether there are residual stress cracks; ③anneal out-of-limit parts and re-inspect; after adjustment, take continuous samples to verify the effect, and resume mass production only after confirming stability
Conclusión clave
The hydrochloric acid soaking method is the on-site touchstone for POM stress; it turns hidden stress into visible cracks, achieving preventive screening; after confirming effectiveness, solidify the parameters and practices into the work instruction to prevent recurrence
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