Molds & Tooling
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POM product ejector pin marks
Problembeschreibung
Raised marks and even micro-cracks appear at ejector pin positions on the back of the product, and the marks are visible through the appearance surface.
Ursachenanalyse
The product temperature is too high and strength insufficient at ejection, or the gripping force is large causing the ejector pins to press in; small ejector pin diameter and few pins cause excessive local pressure.; during on-site troubleshooting, verify item by item according to this mechanism, and avoid blindly adjusting the machine based only on experience
Lösung
①Extend cooling time to lower the ejection temperature; ②increase ejector pin diameter and quantity; ③increase mold temperature to reduce gripping; ④optimize ejector pin layout to avoid weak surfaces.; after adjustment, continuously sample to verify the effect, and resume mass production only after confirming stability
Wichtigste Erkenntnis
Ejector pin marks are the result of improper ejection timing and layout; sufficient cooling plus reasonable ejection design can eliminate the risk of marks and micro-cracks.; after confirming effectiveness, fix the parameters and practices into the work instruction to prevent recurrence
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