Molds & Tooling
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EEA Insufficient Flatness
Problem Phenomenon
EEA flat product flatness >0.5mm/100mm, warpage
Cause Analysis
EEA shrinkage rate large and different in each direction; mold cooling uneven; residual stress release causes continuous warpage
Solution
1) Uniform mold temperature to reduce temperature differences; 2) Increase holding pressure to reduce shrinkage differences; 3) Anneal to release residual stress
Key Takeaway
Insufficient flatness is caused by shrinkage differences and stress; uniform cooling and annealing are key
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