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薄壁管材连续矫直拉伸失稳极限弯曲半径作为重要的工艺参数,直接决定了设备结构和产品质量。而目前现场仍沿用经验图表结合人工经验和反复试矫对其进行估定,为此基于薄壳理论的相关假设,确定了变形区的应力应变,运用Swift分散失稳准则建立了塑性拉伸失稳极限弯曲半径的解析模型,并进行了有限元仿真验证。研究结果表明:解析模型可正确计算薄壁管材矫直时拉伸失稳的极限弯曲半径,该半径随初始弯曲半径的增大而减小,并与管材直径和金属塑性加工能力有关,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。
Thin-walled pipe continuous straightening tensile instability limit bending radius as an important process parameters, directly determine the equipment structure and product quality. At present, the empirical charts are still used in the field to assess the deformation and deformation of the deformed zone based on the assumption of thin shell theory with the combination of the human experience and repeated tests. Based on the Swift dispersion instability criterion, the plastic tensile loss Stability analysis of the bending radius of the model, and the finite element simulation. The results show that the analytical model can correctly calculate the ultimate bending radius of the tensile instability of thin-walled tubes during straightening, which decreases with the increase of the initial bending radius and is related to the tube diameter and metal plastic working capacity. In-depth study of the reasonable setting straightening process parameters, improve the theory of thin-walled tube laying the foundation for straightening theory.