Extrusion & Post
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HDPE pipe haul-off skew deformation
Problem Phenomenon
The pipe shows one-sided indentation and bending after haul-off, and inspection finds the haul-off machine is not aligned with the extrusion centerline.
Cause Analysis
The haul-off machine centerline is not aligned with the head, subjecting the pipe to lateral pulling force and local pressing force; excessive crawler pressure also flattens the insufficiently cooled pipe wall.; during on-site troubleshooting, verify item by item according to this mechanism, and avoid blindly adjusting the machine based on experience alone
Solution
①Align the centerline of the entire line from the head to cutting; ②adjust the crawler pressing force to no slipping and no flattening; ③check the position of each cooling tank; ④observe the deviation direction to locate the deviation source.
Key Takeaway
Haul-off alignment is the foundation of pipe straightness; the deviation direction is the direction of deviation, and full-line laser alignment is an efficient troubleshooting means.; after confirming effectiveness, fix the parameters and practices into the work instruction to prevent recurrence
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