The inclined six-roll tube straightener is an important equipment for the finishing line. It can not only straighten the steel pipe, but also finish the ovality of the cross section. In the actual straightening process, the cross section of the tube is prone to deform, that is, the roundness is not good. The flattening displacement is an important parameter to control cross-section forming of tube. According to the established mechanical model, the analytical calculation equations of the flattening force and the flattening displacement were derived using the energy method. Based on the finite element simulation data, the ratios of the finite element results of the flattening force to the analytical ones were fitted. The correlation coefficient after fitting is greater than 99%, and the fitting effect is excellent. The flattening experiment was carried out on tubes of different materials and different specifications, and the setting method of the optimal flattening displacement during straightening process was obtained. In the actual straightening process, using this flattening displacement, the ovality of straightened steel tube is less than 0.3%. Therefore, the proposed method can provide a reference for the flattening displacement in the actual straightening process.

斜六辊矫直机是精整线的重要设备。它不仅可以拉直钢管，还可以完成横截面的椭圆形。在实际的矫直过程中，管子的横截面容易变形，即圆度不好。扁平位移是控制管子横截面形成的重要参数。根据建立的力学模型，利用能量法推导了压扁力和压扁位移的解析计算方程。基于有限元模拟数据，拟合了压扁力有限元结果与解析结果的比率。拟合后的相关系数大于99％，拟合效果极好。对不同材质，不同规格的管子进行了扁平化实验，得出了矫直过程中最佳扁平化位移的设定方​​法。在实际的矫直过程中，使用该矫正位移，矫直的钢管的椭圆度小于0.3％。因此，所提出的方法可以为实际矫直过程中的扁平位移提供参考。