辊式矫直机矫直板带浪形的有限元仿真分析

 辊式矫直机的矫直功能是中厚板生产线上保证板带板形的重要手段,其矫直过程可以消除或均匀板带内部残余应力,对提高板带综合质量具有重要意义。为了分析矫直机对带有边浪的板带的矫直过程以及矫直效果,首先建立了板带弯曲挠度的计算模型,为确定矫直辊的压弯量奠定了基础。在矫直模型作为压弯量设定的基础上,参考现场实际设备尺寸,通过借助大型商用有限元软件ANSYS建立了11辊的辊式矫直机有限元仿真模型,并针对研究目标设计了相应的仿真工况,将模型的矫直过程调整为采用上辊系整体压下倾斜的设置,对不同浪高的板带进行仿真分析。将有限元模型计算出的矫直力与生产实际设备的矫直力进行对比,有限元模型的矫直力计算偏差约为8.3%,满足计算精度要求。设置边浪浪高分别为5、10、20 mm的板带作为仿真工况,对其矫直过程进行仿真计算,提取仿真结果中的相关数据进行分析,发现在不采用弯辊的条件下,矫直过程同样具有消除板带不平度的作用。结果表明,在浪高较大时,矫直过程消除不平度的作用明显,但是矫直后板带并不能达到最终的平整度要求;在浪高较小时,矫直过程对不平度的消除能力较弱,但矫直后板带不平度可以达到最终的平整度要求。在分析的基础上,在工业现场的实际设备中进行相关试验,试验数据表明,仿真结果与试验结果趋势相同。

Finite element simulation analysis of strip wave straightening by roller straightener

The straightening function of the roller straightener is an important means to ensure the shape of the strip on the medium and heavy plate production line. The straightening process can eliminate or uniformize the internal residual stress of the strip,which is of great significance to improve the comprehensive quality of the strip. In order to analyze the straightening process and straightening effect of the straightening machine on the strip with edge waves,the calculation model of the bending deflection of the strip is first established,which lays a foundation for determining the bending amount of the straightening roller. On the basis of the straightening model as the setting of the bending amount,referring to the actual equipment size in the field,a finite element simulation model of an 11-roll roller leveler was established with the help of the large-scale commercial finite element software ANSYS. According to the research objective,the corresponding simulation conditions are designed,the straightening process of the model is adjusted to the setting of the overall pressing and inclination of the upper roller system,and the simulation analysis of the strip with different wave heights is carried out. Comparing the straightening force calculated by the finite element model with the straightening force of the actual production equipment,the calculation deviation of the straightening force of the finite element model is about 8.3%,which meets the calculation accuracy requirements. Set the strips with edge wave heights of 5,10, and 20 mm as the simulation conditions,carry out simulation calculation on the straightening process,extract the relevant data in the simulation results for analysis,and find that under the condition of not using bending rollers,the straightening process also has the effect of eliminating the unevenness of the strip. The results show that when the wave height is large,the straightening process has an obvious effect on eliminating the wave,but the strip after straightening cannot meet the final flatness requirements; when the wave height is small,the ability of the straightening process to eliminate the roughness is weak,but the wave of the strip after straightening can meet the final flatness requirements. Based on the analysis in this paper,relevant experiments are carried out on the actual equipment in the industrial field. The experimental data show that the simulation results have the same trend as the experimental results.