锻压技术

基于一步成形法的薄壁圆管液压胀形

英文标题：Hydroforming for thin-walled round tube based on one-step forming finite element method

作者：周佳恺1 鲍益东2

分类号：TG394

出版年,卷(期):页码：2021,46(12):122-127

摘要：

针对薄壁圆管的液压胀形过程，需要建立一种快速准确的仿真方法，从而节约设计初期的时间和成本，提出一种基于一步成形法的薄壁圆管液压胀形方法。该方法将管坯作为初始构形，将凹模型腔作为最终的构形型面，把胀形过程视为一个近似比例加载的过程，仅研究从初始构形出发到最终构形的变形情况，推导出初始构形和最终构形的几何关系，确定了管材液压胀形的本构关系，针对管材成形特点选择了DKT12单元模型，最终建立了有限元平衡方程，并使用牛顿-拉普森迭代法进行计算。基于上述理论，开发了相关程序，通过对比Abaqus及试验值的结果，验证了所提出的方法具有较高的计算精度和计算效率。

For the hydroforming process of thin-walled round tube, it is necessary to establish a fast and accurate simulation method to save the time and cost in the early stage of design. Therefore, a kind of hydroforming method of thin-walled round tube was proposed based on one-step forming method. In this method, the tube blank was taken as the initial configuration, the die cavity was taken as the final configuration surface, and the hydroforming process was regarded as an approximate proportional loading process. Then, the deformation from the initial configuration to the final configuration was only studied, and the geometric relationship between the initial configuration and the final configuration was deduced to determine the constitutive relationship of tube hydroforming. Furthermore, according to the characteristics of tube forming, the DKT12 element model was selected, and the finite element equilibrium equation was established to calculate by Newton Raphson iterative method. Finally, based on the above theories, the related program was developed. And by comparing the results of calculation values from software ABAQUS and experimental values, it is verified that the proposed method had high calculation accuracy and efficiency.

基金项目：

国家自然科学基金面上项目（51775273）

周佳恺（1991-），女，硕士，助教 E-mail：zhoujiakaigz@163.com 通信作者：鲍益东（1976-），男，博士，副教授 E-mail：baoyd@nuaa.edu.cn

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