Molds & Tooling
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POM Weld Line Strength
Problem Phenomenon
Insufficient strength at the weld line; gears and snaps fracture and fail along the weld line
Cause Analysis
When POM melt fronts meet, molecular chain entanglement is insufficient, making the weld line a weak strength band; improper gate position causes the weld line to fall in the stressed area, cracking first under fatigue load
Solution
①Increase mold temperature to improve front fusion quality; ②position the gate so the weld line avoids stressed areas; ③if necessary, set an overflow well to discharge the cold material front; after adjustment, take continuous samples to verify the effect, and resume mass production only after confirming stability
Key Takeaway
POM weld line management relies on moving design forward; high mold temperature and gate layout optimization transfer the weak line to non-critical areas; after confirming effectiveness, solidify the parameters and practices into the work instruction to prevent recurrence
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