Extrusion & Post
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EMA Extruded Profile Bending Deformation
Problem Phenomenon
EMA extruded profiles continuously bend after cooling, bending amount >5mm/m
Cause Analysis
Uneven cooling of each face of the profile causes shrinkage differences; uneven die discharge flow speed makes the wall thicknesses of the profile different; haul-off and extrusion centerlines not aligned, producing lateral force
Solution
1) Optimize the cooling system to ensure uniform cooling of each face; 2) Adjust the die to make the flow speed of each wall uniform and the wall thickness consistent; 3) Align the haul-off and extrusion centerlines; 4) Increase sizing sleeve length, cool after full sizing
Key Takeaway
Profile bending is caused by uneven cooling and uneven flow speed; uniformization and alignment are the key to solving it
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