Processing Machinery
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POM thick-walled part internal voids
Problem Phenomenon
Sectioning of thick-walled products reveals internal voids and loose areas, and fracture originates from the voids when stressed.
Cause Analysis
The surface layer of thick-walled areas solidifies first, and the internal melt has no feeding channel when shrinking, forming vacuum voids; holding pressure cannot penetrate the solidified surface layer to reach the center of thick areas.; during on-site troubleshooting, verify item by item according to this mechanism, and avoid blindly adjusting the machine based only on experience
Solution
①Core out and thin thick walls to uniformize wall thickness; ②extend holding time; ③reduce the mold temperature gradient for gentle cooling; ④evaluate gas-assisted '2079851475616104452.; after adjustment, continuously sample to verify the effect, and resume mass production only after confirming stability
Key Takeaway
Thick-wall voids are structural defects; coring-out design is the most effective countermeasure, and process means have limited feeding capability for ultra-thick sections.; after confirming effectiveness, fix the parameters and practices into the work instruction to prevent recurrence
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