Processing Machinery
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POM Fatigue Fracture
Problem Phenomenon
POM snaps fracture at the root after repeated use
Cause Analysis
Stress concentrates at the snap root, and fatigue accumulates under cyclic bending; during on-site troubleshooting, verify item by item according to this mechanism, and avoid blindly adjusting the machine based only on experience; this mechanism has been repeatedly verified by industry literature and should be confirmed first during troubleshooting
Solution
Enlarge root fillet; limit assembly/disassembly angle; verify by fatigue life testing; after adjustment, take continuous samples to verify the effect, and resume mass production only after confirming stability; change only one variable at a time and record parameter changes to facilitate locating effective measures
Key Takeaway
Snaps are designed and verified by fatigue life; after confirming effectiveness, solidify the parameters and practices into the work instruction to prevent recurrence; include this case in the defect archive as a troubleshooting reference for subsequent similar problems
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