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通过分析连续柔性成形装置的结构特点,提出了柔性辊离散和连续两种建模方法.从接触方式、应力分布等方面对两种有限元模型进行比较,结果表明:柔性辊离散模型中的刚体短辊以分段折线逼近目标曲线形状,与板料为点接触,柔性辊连续模型中的实体辊与板料为光滑曲线接触;相比于光滑曲线接触,从厚度分布可以看出点接触导致了鞍面件厚度分布不均匀,产生了局部变形;柔性辊连续模型的应力分布较离散模型均匀.采用两种有限元模型成形鞍面件和球面件并与实验结果比较,可知柔性辊连续模型预测实验件的偏差小于离散模型的偏差,说明其更适用于模拟连续柔性成形过程.
By analyzing the structural characteristics of continuous flexible forming device, two discrete and continuous modeling methods of flexible roller are proposed.The two finite element models are compared from the aspects of contact mode and stress distribution.The results show that rigid body The short roller approached the shape of the target curve with a segmented polygonal line and was in point contact with the sheet. The solid roller in the continuous model of the flexible roller was in smooth curve contact with the sheet; compared with the smooth curve contact, the point contact was seen from the thickness distribution The thickness distribution of the saddle was uneven and the local deformation was produced.The stress distribution of the continuous model of the flexible roller was more uniform than that of the discrete model.The saddle and the spherical were formed by two finite element models and compared with the experimental results, The deviation of the experimental piece is predicted to be smaller than that of the discrete model, indicating that it is more suitable for simulating the continuous flexible forming process.