Processing Machinery
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PA66 fan shroud
Problem Phenomenon
Cooling fan shroud fixing ears break during vibration testing
Cause Analysis
The shroud is excited by engine vibration, stress concentrates at the fixing ear root, and fatigue accumulates to fracture; during on-site troubleshooting, verify item by item according to this mechanism, avoiding blindly adjusting the machine based only on experience
Solution
Add fillets and reinforcing ribs at fixing ear roots; select fatigue-resistant reinforced grades; verify according to random vibration spectrum; after adjustment, take continuous samples to verify the effect, confirm stability before resuming mass production
Key Takeaway
Vibration part fixing structures are designed and verified according to fatigue spectrum; 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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