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针对薄壁管材在连续矫直过程中大弯曲变形产生的截面扁化,需对管材截面进行压扁矫圆。在分析压扁矫圆变形过程和成形机理的基础上,结合薄壳弹塑性理论及其相关假设,确定了变形区的周向应变模型,进而完成了周向弯曲力矩的解析,运用经典卸载规律建立了薄壁管材截面矫圆的压扁量数学模型方程。通过有限元仿真分析证明了该模型的正确性和有效性,同时得到用初始截面径向最大位移量的2倍近似估算压扁量的方法,为继续深入研究矫直相关工艺参数的合理设置、完善薄壁管材矫直理论体系奠定基础。
For the thin-walled pipe in the process of continuous straightening large bending deformation of the cross-section of the flattening of the need to cross-section of the pipe. Based on the analysis of deformation process and forming mechanism of the flattened circle, the circumferential strain model of the deformed zone was determined by combining the thin-shell elasto-plastic theory and its related assumptions, and then the circumferential bending moment was solved. The classical unloading rule The mathematic equation of the flattening of the thin-walled tube section is established. The correctness and validity of this model are verified by the finite element simulation analysis. At the same time, the method of approximating the flattening by 2 times the maximum radial displacement of the initial section is obtained. In order to further study the reasonable setting of the relevant straightening process parameters, Improve the theoretical system of thin-walled tube lay the foundation.