Molds & Tooling
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MP insufficient flatness
Problem Phenomenon
MP flat products flatness >0.5mm/100mm, warpage
Cause Analysis
MP shrinkage large and anisotropic; mold cooling uneven; residual stress release causing continuous warpage
Solution
1) uniform mold temperature to reduce temperature difference; 2) increase holding pressure to reduce shrinkage difference; 3) annealing to release residual stress
Key Takeaway
insufficient flatness is caused by shrinkage difference and stress; uniform cooling and annealing are key
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