Influence of Elastically Modeled Parts of Press Machine on Torsion Prediction: ―Improvement of CAE Springback Prediction by Considering Elastic Deformation of Tools I―@@@―金型弾性変形考慮によるスプリングバック予測の高精度化 第1報―
Influence of Elastically Modeled Parts of Press Machine on Torsion Prediction: ―Improvement of CAE Springback Prediction by Considering Elastic Deformation of Tools I―@@@―金型弾性変形考慮によるスプリングバック予測の高精度化 第1報―
复制标题
压力机弹性建模零件对扭转预测的影响：―考虑工具弹性变形的 CAE 回弹预测的改进 I―@@@―考虑模具弹性变形的回弹预测的高精度第 1 部分―
DOI：
10.9773/sosei.56.311
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发表时间：
2015
期刊：
影响因子：
--
通讯作者：
T. Kuwabara
中科院分区：
文献类型：
--
作者：
A. Ishiwatari;J. Hiramoto;T. Urabe;T. Kuwabara
有限元模拟很难高精度地预测回弹，尤其是扭转回弹。总的来说，回弹预测更加准确，这主要是由于改进了材料模型，如包辛格效应和塑性各向异性模型。在这项研究中，除了考虑精确的材料模型外，还对考虑刀具变形的冲压成形进行了有限元分析，以改进回弹预测。测量了模具变形，验证了有限元分析的准确性。对曲面帽形制品进行了冲压成形，研究了模具行程对扭转回弹的影响。为提高冲模冲程与扭转回弹关系的预测精度，研究了压力机弹性建模零件对回弹预测的影响。结果表明，弹性模型的数量越多，实验结果与数值模拟结果之间的相关性越好。使用三种不同弹性和刚性零件组合的有限元模拟结果之间的差异很小，尽管弹性建模的模拟结果与实验结果的一致性比使用完全刚性工具模型的模拟结果要好得多。
It is difficult to predict springback, particularly in torsion, with high accuracy by finite-element (FE) simulation. Generally, more accurate springback prediction has been achieved mainly as a result of improved material models such as the Bauschinger effect and plastic anisotropy models. In this study, FE analysis of press forming taking account of tool deformations was carried out in addition to considering an accurate material model in order to improve springback prediction. Die deformations were measured to verify the accuracy of FE analysis. Press forming of curved hat-shaped products was carried out and the effect of the die stroke on torsion springback was examined. The effect of the elastically modeled parts of a press machine on springback prediction was investigated to improve the prediction of the relationship between the die stroke and torsion springback. It was demonstrated that the larger the number of elastically modeled parts, the better the correlation between the experimental results and the numerically simulated results. The differences in the torsion springback predictions between FE simulations with three different combinations of elastic and rigid parts were small although elastically modeled simulations have much better agreement with experimental results than the simulations with the fully rigid tool model.