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以7A60铝合金杯形件为研究对象,通过工艺实验和有限元模拟研究了杯形件在等温压扭成形过程中关键工艺参数对其成形性能的影响。结果表明:坯料高径比对累积变形量的影响主要在镦粗变形阶段,下模扭转速度增大,成形载荷降低,扭矩增加;但当下模转速太大时,压扭件盘面过渡圆角区域损伤值将大于1,边缘易于产生破裂缺陷;成形温度的变化对成形载荷和扭矩的影响较为显著;成形过程中对压扭件施加小于1圈的扭转剪切变形,合金的连续性不会遭到破坏,且合金强度相比传统挤压件有所提高。
With 7A60 aluminum alloy cup as the research object, the influence of the key process parameters on the formability of the cup in the isothermal compression-forming process was studied through the process experiment and the finite element simulation. The results show that the effect of billet height-diameter ratio on the cumulative deformation is mainly at the stage of upsetting deformation, the lower mold torsional speed increases, the forming load decreases and the torque increases. However, when the lower mold rotational speed is too large, The damage value will be greater than 1, the edge is prone to rupture defects; the influence of forming temperature on the forming load and torque is more significant; the torsion shear deformation less than 1 circle is applied to the compression member during the forming process, and the continuity of the alloy will not be affected To rupture, and the strength of the alloy compared to the traditional extrusion has improved.