六辊轧机扭振动态建模及与板带钢质量关系研究

TORSIONAL VIBRATION OF 6-H ROLLING MILL BASED ON CONTINUUM DYNAMICS AND ITS RELATIONSHIP WITH STRIP QUALITY

考虑轧机扭振与辊系沿轴向动态特性和板带材质量的关系,基于连续体动力学建立了六辊轧机扭振动力学模型,包括轧机辊系等效模型和辊身与辊径过渡部分等效模型。根据轧制速度与轧辊角速度的关系,建立了板带钢前后张力、轧制力等参数与辊系扭振的关系模型。基于所建模型对某六辊轧机施加位移激励模拟扭振情况,仿真分析了轧机辊系和板带钢在扭振激励下的三维动态响应。仿真结果表明,轧辊角位移和角速度沿辊身长度方向波动较小;轧辊扭振使轧制压力、前张应力和后张应力横向分布发生不同程度的波动,扭振对前张应力分布影响较大,即对板带钢板形产生影响,且传动侧的波动幅值大于操作侧。

The relationship between the dynamic characteristics of torsional vibration of the rolling mill system and the quality of the strip was taken into consideration in this paper, then the torsional vibration model of 6-H rolling mill based on continuum dynamics was built, which consists of the rolls system equivalent model and the roll neck transition portion equivalent model. According to the relationship between the rolling speed and the angular velocity of the roll, the relationship between rolling deformation and torsional vibration was established. Based on the proposed model, the three dimensional dynamic responses of rolling mill and strip were simulated. Simulation results show that the roll angular displacement and the angular velocity fluctuate tinily along the roll axial direction; while the distribution of rolling pressure, the backward stress and the forward stress fluctuate to varying degrees by the torsional vibration of the rolls, and the amplitude of the drive side is larger than that of the operation side.