Molding Process
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Material Sticking to Sizing Sleeve of CMC Extruded Pipe
Problem Phenomenon
CMC extruded pipe sticks in the sizing sleeve, and longitudinal sticking marks appear on the inner wall
Cause Analysis
CMC is soft and easily adheres to metal surfaces; sizing sleeve inner wall is rough Ra>0.4μm; sizing sleeve cooling is insufficient and surface temperature is high, promoting adhesion
Solution
1)Polish sizing sleeve inner wall to Ra<0.2μm; 2)Fully water-cool the sizing sleeve with surface <30°C; 3)Pass lubricating water containing 0.1% silicone oil emulsion inside the sizing sleeve; 4)Apply a thin coating on the pipe surface to reduce adhesion
Key Takeaway
Sizing sleeve sticking is caused by elastomer adhesion characteristics; polishing and lubricating water are the key
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