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<p>Chatter in cold tandem rolling mills severely limits improvements in product quality and production efficiency. To address the negative damping effect of rolling parameters during unsteady rolling and the resulting severe mill vibration, this paper establishes a single-stand vibration model based on a six-roll cold rolling mill, incorporating asymmetric rolling and vertical-torsional structural coupling. By introducing multi-directional vibration velocities, the interfacial dynamic characteristics and stability evolution mechanism of the rolling system under negative damping effects are systematically analyzed. The results indicate that back tension is the dominant factor contributing to the negative damping effect, accounting for over 60% of its influence. Moreover, when the work-roll speed ratio falls below 1.06, negative forward slip occurs in the system. Based on these mechanisms, the equivalent damping coefficient model proposed in this study is applied to the single-stand chatter model, providing a theoretical foundation and practical process optimization measures for vibration suppression in actual production.</p>

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Equivalent damping calculation method in coupled vibration of cold rolling mills

  • 期刊论文

  • 发表日期：

    2026年3月17日

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  • Fangsheng Chen,
  • Xu Li,
  • Xiaohua Li,
  • Lei Cao

摘要

Chatter in cold tandem rolling mills severely limits improvements in product quality and production efficiency. To address the negative damping effect of rolling parameters during unsteady rolling and the resulting severe mill vibration, this paper establishes a single-stand vibration model based on a six-roll cold rolling mill, incorporating asymmetric rolling and vertical-torsional structural coupling. By introducing multi-directional vibration velocities, the interfacial dynamic characteristics and stability evolution mechanism of the rolling system under negative damping effects are systematically analyzed. The results indicate that back tension is the dominant factor contributing to the negative damping effect, accounting for over 60% of its influence. Moreover, when the work-roll speed ratio falls below 1.06, negative forward slip occurs in the system. Based on these mechanisms, the equivalent damping coefficient model proposed in this study is applied to the single-stand chatter model, providing a theoretical foundation and practical process optimization measures for vibration suppression in actual production.