Molds & Tooling
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Internal Shrinkage Voids of CMC
Problem Phenomenon
Shrinkage voids of 0.5-2mm diameter in the center of thick-walled CMC products
Cause Analysis
After cooling, the interior of the thick-walled area shrinks, but the surface has solidified and cannot be fed; holding time is insufficient and the gate freezes prematurely
Solution
1)Extend holding time until the gate is completely frozen; 2)Increase gate size to delay freezing; 3)Product design to reduce wall thickness differences
Key Takeaway
Shrinkage voids are caused by thick-wall shrinkage and insufficient holding; extending holding is the key
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