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Coupling of an analytical rolling model and reinforcement learning to design pass schedules: towards properties controlled hot rolling

Published: 19 April 2023 Publication History

Abstract

Rolling is a well-established forming process employed in many industrial sectors. Although highly optimized, process disruptions can still lead to undesired final mechanical properties. This paper demonstrates advances in pass schedule design based on reinforcement learning and analytical rolling models to guarantee sound product quality. Integrating an established physical strengthening model into an analytical rolling model allows tracking the microstructure evolution throughout the process, and furthermore the prediction of the yield strength and ultimate tensile strength of the rolled sheet. The trained reinforcement learning algorithm Deep Deterministic Policy Gradient (DDPG) automatically proposes pass schedules by drawing upon established scheduling rules combined with novel rule sets to maximize the final mechanical properties. The designed pass schedule is trialed using a laboratory rolling mill while the predicted properties are confirmed using micrographs and materials testing. Due to its fast calculation time, prospectively this technique can be extended to also account for significant process disruptions such as longer inter-pass times by adapting the pass schedule online to still reach the desired mechanical properties and avoid scrapping of the material.

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Published In

cover image Journal of Intelligent Manufacturing
Journal of Intelligent Manufacturing  Volume 35, Issue 4
Apr 2024
485 pages

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Springer-Verlag

Berlin, Heidelberg

Publication History

Published: 19 April 2023
Accepted: 15 March 2023
Received: 31 December 2021

Author Tags

  1. Hot rolling
  2. Pass schedule design
  3. Reinforcement learning
  4. Fast rolling models
  5. Properties control

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