Extrusion & Post
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Bending deformation of EAA extruded profiles
Problem Phenomenon
EAA extruded profiles show continuous bending after cooling, deflection >5mm/m
Cause Analysis
Uneven cooling of each face of the profile causes shrinkage differences; uneven die outflow velocity makes the wall thickness of the profile different; misalignment of the haul-off and extrusion centerline produces lateral force
Solution
1) Optimize the cooling system to ensure uniform cooling of each face; 2) Adjust the die to make the flow velocity of each wall uniform and the wall thickness consistent; 3) Align the haul-off and extrusion centerline; 4) Increase the length of the sizing sleeve, cool after full sizing
Key Takeaway
Profile bending is caused by uneven cooling and uneven flow velocity; homogenization and alignment are the keys to solving it
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