Chatter in Rolling

本课题旨在对板材轧制过程中的颤振问题进行理论和实验研究。理论研究将包括开发轧机结构和轧制过程的动态模型，将这些模型耦合起来，创建一个关于连轧机组颤振的综合模型。这项研究特别强调了那些已知对连轧稳定性有深远影响的现象，这些现象只有很少的理论结果。这些与工艺有关的现象包括：多模式三维轧机振动引起轧辊咬合几何形状变化的影响；第五倍频程振动导致轧辊磨削振痕和剥落，从而引起轧辊几何形状和摩擦的变化；以及带钢横向振动和动态摩擦效应对带钢入口角的影响。开发的结构和轧制过程动力学模型将被合并为一个全面的颤振模型，以确定单机架和多机架轧机中关于负过程阻尼、带钢和轧辊再生、扭转振荡和其他复合机制的轧机稳定性。实验将在独特的、全仪器的实验室规模的磨机上进行，并结合工业上实际生产规模的磨机测量的数据进行。这将有助于理论模型的开发和验证。将在钢铁和铝工业磨机机架上进行验证。这项研究有望为板材加工提供更好的轧制和工艺设计方法，并为更智能的轧制控制系统奠定基础。

This project is to conduct a theoretical and experimental research program on chatter in the rolling of flat products. The theoretical research will include the development of dynamic models of mill structures and of the rolling process, coupling these models to create a comprehensive model for chatter in tandem rolling mills. The research places particular emphasis on the phenomena that are known to have a profound influence on tandem mill stability where only a few theoretical results are available. These process dependent phenomena include the effect of multi-modal three dimensional mill vibrations introducing variations in roll-bite geometry; fifth-octave-mode chatter leading to roll grinding chatter marks and banding due to debris pickup that can cause variations in roll geometry and friction; and the consequences of strip transverse vibrations and dynamic friction effects upon the entry angle of the strip. The developed structural and rolling process dynamics models will be combined into an all-encompassing chatter model to ascertain mill stability with respect to negative process damping, strip and roll regeneration, torsional oscillations, and other composite mechanisms in single and multi-stand mills. Experiments will be conducted on unique, full instrument, laboratory-scale mill in combination with data measured on actual production-scale mills in industry. This will assist the development and validation of the theoretical models. Validation on steel and aluminum industry mill stands will be performed. The research is expected to result in better methods for mill and process design and to lay the groundwork for more intelligent mill control systems for the processing of sheet metal.