六斜辊管材矫直过程精度解析

摘要：以管材六斜辊矫直过程为研究对象，推导了管材经一次反弯后，弹复曲率及残余曲率的演变过程。根据管材旋转一圈弯曲2次，计算了管材全流程矫直微元段的反弯次数；借助三次样条函数，以管材与矫直辊接触点为特征点，拟合出了管材在辊系中的弯曲形态。基于所获得的函数，可以获得任意位置处的弯曲曲率；对某一微梁段的反弯弹复过程进行循环迭代，计算出管材微梁段的最终残余曲率，进而得到最终的管材矫后的直线度精度。通过与现场矫直数据对比，证明该模型能够可靠地预测六斜辊矫直精度，为科学合理的设定矫直参数奠定了理论基础。

Accuracy analysis of six skewed roll straightening process of tube

Taking the six skewed roll tube straightening process as the research object, the evolution process of spring back curvature and residual curvature of tube after single bending were deduced.For the micro beam segment, the bending times of tube during the whole straightening process were calculated according to bending two times for one rotating circle.By means of the cubic spline function, taking the contact points between the tube and the straightening roller as the characteristic points, the bending form of the tube in the roller system was fitted.Based on the obtained function, the reverse bending curvatures at any position were obtained.The reverse bending process and spring back process for the micro beam segment were iteratively calculated, and the final residual curvature was calculated.By comparing with the field straightening data, it is proved that the model can reliably predict the straightening accuracy of six skewed roll straightening, which lays a theoretical foundation for setting straightening parameters scientifically and reasonably.