Extrusion & Post
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Rough Surface of CMC Extrusion
Problem Phenomenon
Surface roughness of CMC extruded products Ra>5μm exceeds the requirement
Cause Analysis
Extrusion temperature is low <20°C and melt flow is unstable; die inner wall is rough or damaged; CMC melt elasticity causes uneven die swell
Solution
1)Increase extrusion temperature to 20-25°C; 2)Polish die inner wall to Ra<0.4μm; 3)Reduce extrusion rate by 10-15%; 4)Add 0.3-0.5wt% external lubricant
Key Takeaway
Rough surface is caused by low-temperature extrusion and die defects; increasing temperature and polishing the die are core countermeasures
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