Production & Quality
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Rough Inner Wall of CMC Extruded Pipe
Problem Phenomenon
Inner wall roughness of CMC extruded pipe Ra>10μm affects fluid conveying efficiency
Cause Analysis
Mandrel surface is rough or worn; insufficient internal cooling causes the inner wall melt not to be fully sized; CMC melt elasticity causes uneven die swell on the inner wall
Solution
1)Polish mandrel to Ra<0.4μm; 2)Optimize internal cooling system with cooling water through the mandrel; 3)Reduce extrusion rate to reduce the influence of elastic recovery; 4)Add a small amount of low-elasticity resin to improve inner wall smoothness
Key Takeaway
Rough inner wall of pipe is caused by mandrel condition and insufficient cooling; polishing the mandrel and internal cooling are the key
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