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Experiment Research on Hot-Rolling Processing of Nonsmooth Pit Surface.

Yun-Qing Gu1, Tian-Xing Fan1, Jie-Gang Mou1

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This study developed a machining robot for creating drag-reducing structures on oil and gas pipeline inner coatings. Optimized hot-rolling conditions improve pit replication, enhancing pipeline transport efficiency.

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Area of Science:

  • Materials Science and Engineering
  • Mechanical Engineering
  • Fluid Dynamics

Background:

  • Oil and gas pipeline transport efficiency is limited by internal surface friction.
  • Developing drag-reducing structures on inner coatings is crucial for improving flow.
  • Existing methods for creating surface textures on pipe interiors are insufficient.

Purpose of the Study:

  • To establish a machining robot model for creating nonsmooth surface drag reduction structures.
  • To investigate the embossing and coating process for polymer inner coatings.
  • To optimize hot-rolling parameters for improved texture replication and pipeline transport.

Main Methods:

  • Structural modeling of a machining robot for pipe inner coating.
  • Experimental analysis of rolling-head embossing and coating under varying temperatures, speeds, and depths.
  • Orthogonal experiment analysis to determine the effects of hot-rolling parameters on pit morphology and quality.
  • Dynamic analysis of the hot-rolling process within the robot system.

Main Results:

  • Elevating rolling temperature and decreasing rolling speed enhance pit structure replication rates.
  • Rolling feed has a minimal impact on replication rates.
  • Rebounding and refluxing of the polymer coating after rolling-head separation were identified as process limitations.
  • Optimized hot-rolling parameters improve the quality and replication of embossed pits.

Conclusions:

  • A machining robot system can effectively create drag-reducing structures on polymer coatings.
  • Hot-rolling temperature and speed are critical parameters for successful texture replication.
  • Further dynamic analysis is needed to overcome material rebounding issues for continuous processing.