Zhao Qilin, Hu Xianlei, Liu Xianghua
School of Materials Science and Engineering, Northeastern University, Shenyang 110819, China.
State Key Laboratory of Rolling and Automation, Northeastern University, Shenyang 110819, China.
Materials (Basel). 2023 Sep 19;16(18):6286. doi: 10.3390/ma16186286.
Mechanical parameters, time consumption and energy consumption are important considerations in the application of a certain rolling process. This study aims to investigate characteristics of the roll force, roll torque, roll power, rolling time and total work in multi-pass asymmetrical rolling of strip. Mathematic models were built using the slab method to calculate parameters in the asymmetrical rolling process, and the characteristics of these parameters were analyzed on the basis of simulation results. Mechanical parameters are affected by the change of deformation region type. When the speed ratio is less than the critical speed ratio, the roll force, absolute values of roll torque and roll power are found to increase with the increase in the speed ratio. After the speed ratio reaches the critical speed ratio, the roll force, roll torque and lower roll power keep constant, but the upper roll power continues increasing. The upper roll torque and upper roll power required by asymmetrical rolling are much greater than that by symmetrical rolling, which indicates that stronger drive shafts and more powerful drive motors are required by asymmetrical rolling. Compared with symmetrical rolling, asymmetrical rolling requires less roll force to obtain the same thickness reduction, especially for thin and hard strips. Rolling time can be saved at the cost of more energy consumption by using asymmetrical rolling with the same roll force to attain the same final thickness. The results and conclusions of this study can provide a reference for mill design and application of asymmetrical rolling in strip manufacturing.
机械参数、时间消耗和能量消耗是特定轧制工艺应用中的重要考虑因素。本研究旨在探究带钢多道次不对称轧制过程中的轧制力、轧制扭矩、轧制功率、轧制时间和总功的特性。采用 slab 方法建立数学模型来计算不对称轧制过程中的参数，并基于模拟结果分析这些参数的特性。机械参数受变形区类型变化的影响。当速比小于临界速比时，轧制力、轧制扭矩绝对值和轧制功率随速比增大而增大。速比达到临界速比后，轧制力、轧制扭矩和下辊功率保持不变，但上辊功率继续增大。不对称轧制所需的上辊扭矩和上辊功率远大于对称轧制，这表明不对称轧制需要更强的传动轴和功率更大的驱动电机。与对称轧制相比，不对称轧制在获得相同压下量时所需轧制力更小，尤其对于薄而硬的带钢。通过采用相同轧制力的不对称轧制以达到相同的最终厚度，可节省轧制时间，但会消耗更多能量。本研究的结果和结论可为轧机设计以及带钢制造中不对称轧制的应用提供参考。
