锻压技术

芯棒结构对薄壁管材自由弯曲成形质量的影响

英文标题：Influence of mandrel structure on forming quality in free bending for thin-walled tube

作者：郭训忠程诚郭嘉鑫张浩陈浩刘春梅

单位：南京航空航天大学

分类号：TG391

出版年,卷(期):页码：2021,46(4):127-135

摘要：

为提高不锈钢薄壁管材自由弯曲的成形质量，在管材内部加入芯棒以降低自由弯曲管材起皱和截面畸变的程度。建立了内置芯棒下自由弯曲成形的力学模型，采用有限元模拟与成形实验相结合的方法，研究了芯棒位置、芯球个数，以及芯棒与管材内壁间隙对自由弯曲成形过程中不锈钢薄壁管材应力、应变分布，截面畸变率和壁厚分布的影响规律。研究结果表明：位于管材变形区的芯球可对薄壁管材内壁起支撑作用；在保证芯球间互不干涉的情况下，芯球数量越多,对管材成形质量的改善程度越大；当芯棒与管材间隙处于合理范围时，自由弯曲成形后的管材外侧壁厚减薄率和截面畸变率较小。

In order to improve the forming quality of stainless steel thin-walled tube in free bending, a mandrel is added into the tube to reduce the degree of wrinkling and sectional distortion of free bending tube. Therefore, the mechanical model with built-in mandrel of free bending was established, and the influence laws of the mandrel position, the number of balls within the mandrel and the gap between mandrel and inner wall of tube on the stress and strain distribution, the sectional distortion rate and the wall thickness distribution of stainless steel thin-walled tube in free bending process were studied by combining finite element simulation with forming experiment. The results show that the balls within the mandrel located in the deformation zone of tube support the inner wall of thin-walled tube, and under the condition of ensuring that the balls within the mandrel do not interfere with each other, the more the number of balls within the mandrel is, the greater the degree of improvement for tube forming quality is. When the gap between mandrel and tube is in a reasonable range, the thinning rate of outer wall thickness and the sectional distortion rate after free bending are smaller.

基金项目：

国家自然科学基金联合基金项目（U1937206）；江苏省重点研发计划（BE2019007-2）；南工程-实验室开放基金（ASMA201903）；青年科技创新基金项目-理工军口类（NT 2020015）；江苏省自然科学基金青年基金（BK20200453）；宁波市“科技创新2025”重大专项（2020Z078）；National Natural Science Foundation of China International（Regional）Cooperation and Exchange Program（5201101342）

郭训忠（1981-），男，博士，教授 E-mail：guoxunzhong@nuaa.edu.cn 通讯作者：程诚（1991-），男，博士，讲师 E-mail：c_cheng@nuaa.edu.cn

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