Processing Machinery
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POM Burnt
Problem Phenomenon
Brown burnt marks appear at fixed positions on POM parts
Cause Analysis
Adiabatic compression of trapped gas raises local temperature above POM's degradation temperature, causing decomposition and discoloration; during on-site troubleshooting, verify item by item according to this mechanism, and avoid blindly adjusting the machine based only on experience
Solution
Open venting inserts at burnt positions; reduce end-stage speed; clean vent grooves; 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
Burnt positions of POM must have structural venting; 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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