锻压技术

工件厚度不均匀性对辊弯成形曲率半径的影响

英文标题：Influence of workpiece thickness non-uniformity on curvature radius for roll bending

作者：郑子君陶裕梅

分类号：TG38

出版年,卷(期):页码：2022,47(9):58-65

摘要：

受制造工艺的影响，原始工件的厚度不均匀，这会对辊弯产品的形状产生影响。通过建立基于欧拉网格的有限元模型，对工件局部厚度具有正态分布的误差时的三辊辊弯过程进行了蒙特卡洛模拟。与传统的基于拉格朗日网格的有限元模型相比，辊弯模拟方案可以明显减小网格规模并简化接触处理，得到了辊弯成形曲率半径的统计规律，并利用3D打印进行了料厚不均匀性与辊弯曲率半径关系的实验。结果表明：随着料厚不均匀性的增大，产品的局部半径分布更广，宏观上观察到的产品半径将减小，实验结果也证实了这一点；对于给定的目标产品形状，辊轮间距和名义厚度越小，辊弯成形受到料厚不均匀性的影响就越大。

Due to the influence of manufacture process, the thickness of original workpiece is nonuniform, which can affect the shape of roll bending product. A finite element model based on Eulerian grid was proposed to conduct the Monte Carlo simulation of three-roll bending process, in which the local thickness of workpiece had normal-distributed error. Comparing with the conventional Lagrangian grid finite element model, the roll bending simulation scheme could reduce the grid number and simplify the contact treatment obviously. Then the statistic laws of curvature radius for roll forming was analyzed, and experiments of relationship between blank thickness non-uniformity and curvature radius of roll bending were conducted by using the 3D printing. The results show that with the increasing of blank thickness non-uniformity, the distribution of local radius for product gets wider, and the macro radius of product becomes smaller, which is verified by the experimental result. For a given goal produce shape, the influence of blank thickness non-uniformity on roll bending is more significant when a smaller roller distance or a thinner nominal thickness is employed.

基金项目：

国家自然科学基金青年科学基金资助项目（11702046）；重庆市教委科学研究项目（KJ1600910）

郑子君（1985-），男，博士，副教授 E-mail：zhengzi@cqut.edu.cn

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