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航空用小直径铝合金管在数控弯曲卸载后会产生比较明显的回弹现象,影响零件的几何和形状精度。基于有限元软件AUTOFORM,建立了LF6铝合金管数控弯曲弹塑性有限元模型。利用该模型,研究了弯曲角度与卸载后回弹角度之间的关系,并通过正交实验分析了工艺参数对小直径LF6铝合金管数控弯曲回弹的影响规律。结果表明,回弹角随着弯曲角度的增大而线性增大;回弹角随芯棒伸出量的增大而减小,随芯棒与管材间隙和管材与压块间摩擦系数的增大而增大,压块相对助推速度小于1时,回弹角增大。
Aerospace small diameter aluminum alloy tube in the NC bending unloading will have a more obvious rebound phenomenon, affecting the geometry and shape accuracy of parts. Based on the finite element software AUTOFORM, a numerical elasto-plastic finite element model of LF6 aluminum alloy tube was established. Using this model, the relationship between bending angle and unloading rebound angle was studied. The influence of process parameters on NC bending rebound of small diameter LF6 aluminum alloy tube was analyzed by orthogonal experiment. The results show that the rebound angle increases linearly with the increase of bending angle. The rebound angle decreases with the increase of the mandrel elongation. With the increase of the friction coefficient between the mandrel and the pipe gap and between the pipe and the compact, Big and increase, relative to the briquetting speed is less than 1, the rebound angle increases.