This paper investigates the effect of asymmetric rolling with a mismatch of the speeds of the working rolls equal to 1,25 on the possibility of increasing the thickness of the hot-rolled strip for manufacturing cold-rolled tape from low-carbon steels. Extensive theoretical and experimental research on asymmetric rolling processes has highlighted its advantages, primarily the potential for significantly reducing rolling force, minimizing resilient deformations of the rolling stand, and as a result increasing reductions per rolling. Asymmetric rolling experiments were conducted on a laboratory rolling mill 400 with individually driven work rolls, allowing for speed ratios ranging from 1.0 to 5.0. The proposed asymmetric rolling technique aims to enhance the technological plasticity of the tape, thereby enabling the production of thicker hot-rolled strips. Also, this paper investigates the effect of asymmetric rolling with a mismatch of the speeds equal to 5 on a simultaneous increase in reduction and decrease in force compared to symmetric rolling. Moreover, gradient recrystallization microstructures were observed in both the longitudinal and transverse directions of the strip after asymmetric rolling.

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Increasing Technological Plasticity of Low-Carbon Steels in the Process of Asymmetric Cold Rolling

  • Alexander Pesin,
  • Georgy Raab,
  • Denis Pustovoytov,
  • Ilya Pesin,
  • Anna Baryshnikova,
  • Leonid Nosov

摘要

This paper investigates the effect of asymmetric rolling with a mismatch of the speeds of the working rolls equal to 1,25 on the possibility of increasing the thickness of the hot-rolled strip for manufacturing cold-rolled tape from low-carbon steels. Extensive theoretical and experimental research on asymmetric rolling processes has highlighted its advantages, primarily the potential for significantly reducing rolling force, minimizing resilient deformations of the rolling stand, and as a result increasing reductions per rolling. Asymmetric rolling experiments were conducted on a laboratory rolling mill 400 with individually driven work rolls, allowing for speed ratios ranging from 1.0 to 5.0. The proposed asymmetric rolling technique aims to enhance the technological plasticity of the tape, thereby enabling the production of thicker hot-rolled strips. Also, this paper investigates the effect of asymmetric rolling with a mismatch of the speeds equal to 5 on a simultaneous increase in reduction and decrease in force compared to symmetric rolling. Moreover, gradient recrystallization microstructures were observed in both the longitudinal and transverse directions of the strip after asymmetric rolling.