Processing Machinery
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PPO Secondary Processing Cracks
Problem Phenomenon
[Problem Phenomenon] Cracks appear after machining and ultrasonic welding of PPO products
Cause Analysis
Residual stress releases and cracks under the energy input of secondary processing; PPO can be secondarily processed but parts with internal stress are at high risk; during on-site troubleshooting, verify item by item according to this mechanism, and avoid blindly adjusting the machine based only on experience
Solution
Anneal to relieve stress before secondary processing; sharp tools and low feed for machining; optimize ultrasonic welding parameters to reduce stress; after adjustment, take continuous samples to verify the effect, and resume mass production only after confirming stability
Key Takeaway
Anneal before PPO secondary processing; energy input will awaken residual stress; 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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