Molds & Tooling
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CEF flatness insufficient
Problem Phenomenon
The flatness of the CEF flat plate product is >0.5mm/100mm, warpage
Cause Analysis
The CEF shrinkage rate is large and anisotropic; the mold cooling is uneven; the release of residual stress causes continuous warpage
Solution
1) Uniform mold temperature to reduce temperature difference; 2) Increase the holding pressure to reduce shrinkage differences; 3) Annealing to release residual stress
Key Takeaway
Insufficient flatness is caused by shrinkage differences and stress; uniform cooling and annealing are the key
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