Molds & Tooling
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POM precision edge flash
Problem Phenomenon
Flash appears at the edges of precision mating parts, affecting assembly dimensions, and the flash at the parting line gradually worsens with production.
Cause Analysis
Insufficient clamping force or wear and deformation of the mold parting line and insert mating surfaces allows high-pressure melt to squeeze into gaps forming flash; POM's good flowability makes it easier to penetrate tiny gaps.
Solution
①Check and increase clamping force; ②overhaul the fitting precision of the parting line and inserts; ③reduce injection pressure and speed; ④repair worn parts.; after adjustment, continuously sample to verify the effect, and resume mass production only after confirming stability
Key Takeaway
POM low-viscosity melt is sensitive to parting line precision; worsening flash indicates mold wear, and timely overhaul is needed to avoid batch dimensional defects.; after confirming effectiveness, fix the parameters and practices into the work instruction to prevent recurrence
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