关键词: 薄壁管材, 矫直曲率半径, 数学模型

Abstract: The straightening curvature-radius as the main straightening technical parameter, decides the precision for straightening tubes especially for thin-walled tubes, however, thin-walled tube straightening is always viewed as a craft, the work being largely carried out based on the classic experiential data and chart by skilled labourers, whose art is based on long experience and experiments, the precise mathematical model of the straightening curvature-radius is immediately necessary for straightening the thin-walled tube. Therefore, a new stress-strain model of the deformation zone firstly is presented based on the elastic-plastic theory and relevant hypothesis of the thin-walled member for straightening thin-walled tube, and then the straightening moment is obtained subsequently, finally the model of the straightening curvature-radius is presented using the classic unloading rule, and it is also shown how to solve synchronously. In order to certify whether it is correct, some dynamic simulations are carried out by FEA and the local experiments. The results and the comparisons with the classic theoretical method have shown that the model is correct and suitable for straightening thin-walled tube, which can also provide the basis for optimizing straightening technical parameters and completing the theory of thin-walled tube straightening.

Key words: Mathematical model, Straightening curvature-radius, Thin-walled tube