Molds & Tooling
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PC Ejection Whitening and Cracking
Problem Phenomenon
[Problem Phenomenon] PC whitens and is pushed through at the ejector pins
Cause Analysis
Insufficient cooling and low strength, few and small ejector pins, fast ejection; internal stress parts are more prone to ejection cracking; when troubleshooting on site, verify each item according to this mechanism one by one, and avoid blindly adjusting the machine based on experience alone
Solution
Extend cooling; add ejector pins; reduce the ejection speed; annealing to relieve stress; after adjustment, take samples continuously to verify the effect, and resume mass production only after confirming stability; change only one variable at a time and record parameter changes, so as to locate effective measures
Key Takeaway
For PC ejection whitening, check cooling and ejection; internal stress parts crack more easily; after confirming effectiveness, solidify the parameters and practices into the work instruction to prevent recurrence; include this case in the defect archive as a reference for troubleshooting similar problems in the future
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