Extrusion & Post
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Out-of-tolerance ovality of EAA extruded pipe
Problem Phenomenon
The ovality of EAA extruded pipe is >1.05, exceeding the 1.02 standard requirement
Cause Analysis
Uneven pipe cooling, one-sided cooling; unreasonable sizing sleeve design; uneven haul-off clamping force causes the pipe to deform under pressure
Solution
1) Use annular spray cooling to ensure uniform cooling; 2) Optimize the inner diameter and taper design of the sizing sleeve; 3) Multi-caterpillar uniform clamping haul-off; 4) Increase the length of the vacuum sizing section to ensure full sizing
Key Takeaway
Ovality is caused by uneven cooling and clamping; annular cooling and uniform haul-off are the key
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