Processing Machinery
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PPO Product Cracking Delayed Failure
Problem Phenomenon
[Problem Phenomenon] PPO products pass factory inspection but crack after assembly or a period of use
Cause Analysis
Residual internal stress is released with delay and cracks under load, temperature or media; stress relaxation and creep redistribute assembly stress; during on-site troubleshooting, verify item by item according to this mechanism, and avoid blindly adjusting the machine based only on experience
Solution
Anneal high-stress parts after molding; design assembly torque and interference according to the material's creep characteristics; perform fracture analysis on failed parts to locate the stress source; after adjustment, take continuous samples to verify the effect, and resume mass production only after confirming stability
Key Takeaway
PPO delayed cracking is a residual stress debt; annealing plus assembly design prevents it; 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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