Material Drying
4 조회수
PA66 fatigue cracks
문제 현상
Cracks appear at the root of PA66 snap-fits after repeated assembly and disassembly
원인 분석
Stress concentrates at the snap-fit cantilever root, repeated bending accumulates fatigue, and low dry-state toughness accelerates crack initiation; during on-site troubleshooting, verify item by item according to this mechanism, avoiding blindly adjusting the machine based only on experience
해결 방법
Enlarge root fillet; limit assembly/disassembly angle; moisture condition before assembly; verify by assembly/disassembly life test; after adjustment, take continuous samples to verify the effect, confirm stability before resuming mass production
핵심 요약
Snap-fit fatigue relies on fillet design and moisture conditioning toughness guarantee; after confirming effectiveness, fix the parameters and practices into the work instructions to prevent recurrence; include this case in the defect archive as a troubleshooting reference for subsequent similar problems
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