Molds & Tooling
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CEF internal shrinkage cavity
Problem Phenomenon
Shrinkage cavities with a diameter of 0.5-2mm appear in the center of the CEF thick-walled product
Cause Analysis
The thick-walled area shrinks internally after cooling but the surface has solidified and cannot be fed; the holding pressure time is insufficient and the gate freezes too early
Solution
1) Extend the holding pressure time until the gate is completely frozen; 2) Increase the gate size to delay freezing; 3) Product design to reduce wall thickness differences
Key Takeaway
Shrinkage cavities are caused by thick wall shrinkage and insufficient holding pressure; extending the holding pressure is the key
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