Processing Machinery
1 views
POM Weld Line Weakening
Problem Phenomenon
POM gears break teeth along the weld line
Cause Analysis
Molecular entanglement at the weld line is weak, and POM's rapid crystallization makes the weld line more brittle; during on-site troubleshooting, verify item by item according to this mechanism, and avoid blindly adjusting the machine based only on experience; this mechanism has been repeatedly verified by industry literature and should be confirmed first during troubleshooting
Solution
Raise melt temperature and mold temperature; overflow well at the weld line; position the gate away from high-stress tooth roots; 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
Weld lines on gears must avoid stressed areas; 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
Was this helpful?
0 people found this helpful
Thank you for your feedback!