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Capillary infolding: Capillary is the defect most likely to occur in cross-rolling piercing, and it is closely related to the piercing performance of the tube blank, the adjustment of the piercing process parameters of the piercing pass machine, and the quality of the piercing plug. Factors affecting capillary infolding: one is the reduction (rate) and compression times before the plug; the other is the hole shape; the third is the surface quality of the plug.
Capillary surface scratches: Although the requirements for the surface quality of perforated capillary pipes are not as strict as those of pipe rolling mills and sizing mills for steel pipe surface quality, severe surface scratches of capillary pipes will also affect the surface quality of steel pipes. Factors affecting the surface abrasion of the capillary tube: mainly because the surface of the perforating tool or the exit roller table of the piercing machine is severely worn, rough or the roller table does not rotate. In order to prevent the capillary surface from being scratched by the surface defects of the perforating tool, the inspection and grinding of the perforating tool (guide cylinder and trough) should be strengthened.
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