Injection Molding
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CMC injection demolding difficult
Problem Phenomenon
The demolding force of the CMC injection molded part is large, the part is deformed or strained, and the demolding time accounts for 30% of the cycle
Cause Analysis
The adhesion between CMC and the mold cavity is large; the draft angle is insufficient <0.5°; the cooling time is insufficient and the part is demolded before being fully solidified; the ejection mechanism design is unreasonable
Solution
1) Increase the mold draft angle to 1-2°; 2) Extend the cooling time so that the part is demolded after being fully solidified; 3) Polish the mold surface to Ra<0.2μm; 4) Increase the ejection area and use a large-area ejector plate; 5) Spray release agent (temporary solution)
Key Takeaway
Difficult demolding is caused by adhesion and insufficient mold design; increasing the draft angle is the fundamental measure
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