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以最大成形系数w_(max)≥1作为拉深失效判据,用Abaqus有限元分析软件模拟了08Al二阶梯圆筒件的拉深成形过程,获得了不同高径比08Al二阶梯圆筒件的拉深次数。研究表明:圆筒件上最大成形系数w_(max)的位置总是出现在小阶梯圆筒上,并随拉深变形程度的增加从小阶梯壁部向其圆角部位转移,阶梯圆筒件拉深的拉裂危险区仍位于小阶梯底部圆角与其壁部交接处;最大成形系数w_(max)的大小随拉深变形程度增加而增大,且当危险区接近拉裂时,最大成形系数w_(max)急剧增大;不同的高径比阶梯筒件需要不同的拉深次数。通过对小阶梯高度h2不同取值(为21、23、27和29 mm)分别进行08Al二阶梯圆筒件的拉深实验,实验所得拉深次数与模拟预测结果一致,从而验证了模拟预测的可行性和其结果的可靠性。
Taking the maximum forming factor w_ (max) ≥1 as the failure criterion, the drawing process of 08Al second-order cylindrical parts was simulated by Abaqus finite element analysis software, and the microstructures of 08Al second-order cylindrical parts with different height- Draw times. The results show that the position of wmax is always on the small cylinder, and it shifts from the small step wall to its rounded part as the depth of deformation increases. The deep fracture zone is still located at the junction of the fillet of the bottom of the small ladder and its wall. The maximum forming factor w max increases with the depth of deformation, and when the danger zone is close to the fracture, the maximum forming factor w_ (max) increases sharply; different height-diameter ratio of the barrel requires a different drawing times. The depth of 08Al second-order cylindrical part was determined by different values (21, 23, 27 and 29 mm) for the height of small step h2, respectively. The number of deep drawing experiments was consistent with the simulation results. Feasibility and the reliability of its results.