Extrusion & Post
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Extruded pipe bent, not straight
Problem Phenomenon
The extruded pipe is bent and not straight, longitudinal warpage deformation, unable to meet straightness requirements
Cause Analysis
Uneven cooling, large differences in cooling rates in all directions of the pipe
Haul-off device eccentric or misaligned
Extrusion temperature too high, pipe rigidity insufficient when just exiting the die
Die and mandrel eccentric
Uneven pipe wall thickness causing shrinkage differences
Solution
Improve cooling to ensure uniformity in all directions
Calibrate the haul-off device to ensure alignment
Appropriately reduce the extrusion temperature to the lower value of 170-230°C
Adjust the concentricity of die and mandrel
Control wall thickness uniformity
Key Takeaway
Pipe bending needs to be addressed from uniform cooling and alignment
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