Molds & Tooling
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Comprehensive Troubleshooting of PSU Product Cracks
Fenómeno del problema
[Problem Phenomenon] PSU products show various cracks such as tensile cracks, ejection cracks and crazing; causes are intertwined and hard to locate
Análisis de la causa
Cracks stem from multiple causes: excessive internal stress, poor demolding, uneven cooling, insufficient wall thickness design and draft angle, improper ejector pin layout; PSU rigid chains make internal stress hard to eliminate, amplifying the influence of each factor
Solución
First anneal to verify whether stress is dominant; check draft angle, ejector pins and cooling uniformity; eliminate sharp corners and notches; perform stress cracking assessment in solvent environments; after adjustment, continuously sample to verify the effect, and resume mass production only after confirming stability
Conclusión clave
PSU cracks have intertwined causes; first anneal to identify stress, then check demolding and structure; After confirming effectiveness, solidify the parameters and practices into the work instructions to prevent recurrence; Include this case in the defect archive as a reference for troubleshooting similar problems in the future
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