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拉伸翻边工艺受多种几何形状、材料和工艺参数的影响。冲模间隙和初始翻边长度是影响边界裂纹位置和沿模侧面半径应力分布的主要参数。采用数值模拟研究AA-5052铝板的非轴对称拉伸翻边工艺,预测翻边的变形行为、裂纹位置和扩展,并且研究拉伸翻边过程中冲模间隙、翻边长度、冲模外形半径和摩擦力的影响。利用实验研究对模拟结果进行验证。结果表明,裂纹长度随翻边长度的增加而增加,翻边长度在周向的影响比在轴向的影响大,冲模间隙比翻边长度对裂纹扩展的影响更大。当冲孔外形半径比模的外形半径小时,周向应变增加,这导致了较快的边裂纹扩展。在边裂纹位置和变形负载方面,模拟结果和实验结果较好吻合。
Stretch flanging is affected by a variety of geometries, materials and process parameters. Die gap and initial flange length are the main parameters that affect the position of boundary crack and the stress distribution along the side of die. The non-axisymmetric stretch flanging process of AA-5052 aluminum plate was studied by numerical simulation to predict the deformation behavior, crack location and extension of flanging, and to study the die clearance, flange length, die radius and friction Influence of force. The experimental results verify the simulation results. The results show that the crack length increases with the increase of the flange length, the influence of the flange length in the circumferential direction is greater than that in the axial direction, and the impact of the die gap has more influence on the crack growth than the flange length. When the perforation profile radius is smaller than the die profile radius, the circumferential strain increases, which results in faster edge crack propagation. The simulation results are in good agreement with the experimental results in terms of crack location and deformation load.