锻压技术

铝型材三维拉弯成形回弹预测的理论解析与数值模拟

英文标题：Theoretical analysis and numerical simulation on springback prediction for 3D stretch bending of aluminum profile

单位：长春工业大学

分类号：TG386

出版年,卷(期):页码：2021,46(4):143-149

摘要：

通过对柔性多点三维拉弯成形工艺原理进行抽象与合理简化，将矩形截面三维拉弯成形过程等效为菱形截面的二维弯曲过程，建立了菱形截面型材回弹理论分析模型；随后建立了矩形截面型材拉弯成形过程及回弹变形的数值模拟模型；基于开发的柔性多点成形装置，分别对比数值模拟和理论解析模型与实验回弹的结果，验证了理论模型的有效性。研究结果表明，理论模型与实验的误差值大于数值模拟与实验的误差值，最大误差值为1.3124 mm，发生在离型材中心最远距离处，且小于目标成形件的最小误差值2 mm。并且理论模型的计算较数值模拟模型更为简单、用时更短，为以后的三维拉弯回弹预测研究提供了理论参考。

By reasonably abstracting and simplifying of the process principle for flexible multi-point 3D stretch bending, the 3D stretch bending process of rectangular-section was equivalent to the 2D bending process of diamond-section, and the theoretical analysis model for springback of diamond-section profile was established. Then, the numerical simulation models of stretch bending process and springback deformation for rectangular-section profile were established, and based on the developed flexible multi-point forming device, the springback results of numerical simulation, theoretical analytical model and experiments were compared to verify the effectiveness of theoretical model. The results show that the error between theoretical model and experiment is larger than that between numerical simulation and experiment with the maximum error of 1.3124 mm, which occurs at the farthest distance from the center of profile and is less than the minimum error of 2 mm for the target forming part. Compared with the numerical simulation model, the calculation of theoretical model is simpler and the time-consuming is shorter, which provides a theoretical reference for the future research of springback prediction in 3D stretch bending.

基金项目：

国家自然科学基金资助项目（51805045）；吉林省科技发展计划项目（20200401115GX）

高嵩（1987-），男，博士，讲师 E-mail：gaosong@ccut.edu.cn

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