Investigating spring back phenomena in double curved sheet metals forming
Investigating spring back phenomena in double curved sheet metals forming
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DOI：
10.1016/j.matdes.2012.05.009
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发表时间：
2012-10-01
影响因子：
8.4
通讯作者：
Kazemi, M.
中科院分区：
文献类型：
--
作者：
Parsa, M. H.;al Ahkami, S. Nasher;Kazemi, M.
回弹是造成冲压件几何精度不合格的主要原因之一。人们对板料回弹量的计算做了许多成功的尝试，但大多数都属于简单的情况，如单曲线U形或V形弯曲。基于考虑板料厚度变化的弯矩-曲率关系，提出了一种双曲面板料成形回弹预测的解析公式。在这个公式中还考虑了中性面的位移。通过与有限元和实验结果的比较，验证了公式的准确性。研究了板料厚度、曲率半径等几何参数对板料回弹行为的影响。不同的金属板已被检查的建模和实验，包括SPCC钢板，商业纯钛板和子弹黄铜片。(C)2012爱思唯尔有限公司保留所有权利。
Spring back is one of the main reasons for geometrical inaccuracy of stamping products. Many successful attempts have been done to calculate the amount of spring back of sheet metals, but most of them belong to the simple cases such as single curved U or V bending. In this paper an analytical formulation based on the moment-curvature relationships considering sheet thickness changes is presented for predicting spring-back in double curved sheet metal forming process. In this formulation displacement of neutral surface is also considered. The accuracy of the formulations is verified by comparisons with finite element and experimental results. The effects of some geometrical parameters such as thickness and curvatures radius on the spring back behavior of sheet metal have been investigated. Different sheet metals have been examined for modeling and experiments including SPCC steel sheets, commercial pure titanium sheets and cartridge brass sheets. (C) 2012 Elsevier Ltd. All rights reserved.