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采用平面应变假设、正交各向异性幂强化材料模型,推导了板料流经拉深筋过程中应力、应变的分布规律。针对试验过程中观察到的由于板料与拉深筋之间会发生分离,从而造成实际弯曲半径增大的现象,提出了有效弯曲半径的修正方法。建立了板料流经拉深筋时厚度减薄的解析模型,并与试验结果进行对比,验证了模型的正确性。基于此模型,研究了拉深筋参数对板厚减薄的影响,结果表明,拉深筋参数对板厚减薄影响较大。减薄随拉深筋高度增加而增大,二者近似呈线性关系,随拉深筋圆角半径的增大而减小。
The plane strain assumption and orthogonal anisotropic exponentially weighted material model are used to deduce the distribution of stress and strain during the process of drawing the slab through drawbead. In view of the phenomenon observed in the experiment that the actual bending radius will increase due to the separation between the sheet metal and the drawbead, a method of correcting the effective bending radius is proposed. The analytical model of the thinning of sheet metal flowing through drawbead was established and compared with the test results to verify the correctness of the model. Based on this model, the influence of drawbead parameters on the thickness reduction is studied. The results show that drawbead parameters have a great influence on the thickness reduction. The thinning increases with the height of the drawbead, which shows a linear relationship between the drawbead and drawbead, which decreases with the increase of drawbead fillet radius.