Molds & Tooling
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PA6 Ejector Whitening and Pin Optimization
Problem Phenomenon
When PA6 products are ejected, the ejector pin positions turn white or even are pushed through
Cause Analysis
Demolding force concentrates at the ejector pin contact points, and local stress in the product exceeds yield causing stress whitening; insufficient ejector pin quantity or improper position aggravates local stress; during on-site troubleshooting, verify item by item according to this mechanism, avoiding blind machine adjustment based only on experience
Solution
Increase the number of ejector pins and arrange them at ribs and thick-wall positions to disperse demolding force; enlarge ejector pin diameter; polish the draft angle to reduce demolding resistance; appropriately raise mold temperature to reduce gripping force
Key Takeaway
Ejector whitening is a demolding force distribution problem, and balanced layout of the ejection system is fundamental; 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 similar problems in the future
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