Processing Machinery
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PPO Stress Relaxation Resistant Application
Problem Phenomenon
[Problem Phenomenon] Snap-fit and press-fit parts under long-term stress loosen due to stress relaxation
Cause Analysis
PPO has excellent stress relaxation resistance and creep resistance, and long-term stressed parts such as snap-fits and press-fits maintain clamping force; it is a prominent advantage for this type of application; during on-site troubleshooting, verify item by item according to this mechanism, and avoid blindly adjusting the machine based only on experience
Solution
Prioritize PPO for long-term stressed parts; design snap-fits according to the stress relaxation curve; relaxation accelerates under high-temperature working conditions and needs to be checked; after adjustment, take continuous samples to verify the effect, and resume mass production only after confirming stability
Key Takeaway
PPO's stress relaxation resistance is the trump card for snap-fit and press-fit parts; after confirming effectiveness, solidify the parameters and practices into the work instruction to prevent recurrence; include this case in the defect archive as a reference for troubleshooting similar problems in the future
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