Investigation to Forming and Springback of Spatial Tubes in Bending-Twisting Process

ZHANG Zengkun; WU Jianjun; SHANG Qi; LI Feifan; ZHAN Xuepeng

doi:10.16080/j.issn1671–833x.2018.16.026

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Investigation to Forming and Springback of Spatial Tubes in Bending-Twisting Process

更新时间：2025-10-30

- Investigation to Forming and Springback of Spatial Tubes in Bending-Twisting Process
- Aeronautical Manufacturing Technology Vol. 61, Issue 16, Pages: 26-31(2018)
- 作者机构：
  
  西北工业大学机电学院,西安,710072
- 作者简介：
- 基金信息：
- DOI：10.16080/j.issn1671–833x.2018.16.026
  CLC：
- Published：2018
- 稿件说明：
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张增坤，吴建军，尚琪，李非凡，展学鹏. 空间管件弯扭组合加载成形及回弹规律研究[J]. 航空制造技术, 2018, 61(16): 26-31.

ZHANG Zengkun, WU Jianjun, SHANG Qi, LI Feifan, ZHAN Xuepeng. Investigation to Forming and Springback of Spatial Tubes in Bending-Twisting Process. Aeronautical Manufacturing Technology, 2018, 61(16): 26-31.
张增坤，吴建军，尚琪，李非凡，展学鹏. 空间管件弯扭组合加载成形及回弹规律研究[J]. 航空制造技术, 2018, 61(16): 26-31. DOI： 10.16080/j.issn1671–833x.2018.16.026.

ZHANG Zengkun, WU Jianjun, SHANG Qi, LI Feifan, ZHAN Xuepeng. Investigation to Forming and Springback of Spatial Tubes in Bending-Twisting Process. Aeronautical Manufacturing Technology, 2018, 61(16): 26-31. DOI： 10.16080/j.issn1671–833x.2018.16.026.

摘要

基于弹塑性力学理论和有限元数值模拟技术，构建空间管件定心弯扭组合加载成形工艺的数值模拟模型。研究弯扭组合条件下空间管件的成形规律、成形过程中工艺参数随固定模离心率 e 的变化规律，以及夹钳扭转角速度一定时固定模离心率 e 和成形轴线挠率修正因子 ϑ 之间的非线性关系。研究发现以下规律：（1）在空间管件定心弯扭组合加载成形工艺中，管件的真实弯曲半径受到弯曲模转角和夹钳扭转角度的双重影响。（2）在纯弯曲条件下所获得的等效弯曲点不能适用于定心模式下空间管件的成形，原因在于管件在等效弯曲点处的挠率修正因子与固定模离心率 e、夹钳角速度与送进速度的比值ω ⁄ v 等多种因素有关。（3）若固定模离心率 e、活动模回转半径和转角不变，则挠率修正因子 ϑ 随夹钳角速度与送进速度的比值ω ⁄ v 的增大而增大；若夹钳角速度与送进速度的比值ω ⁄ v、活动模回转半径和转角不变，则挠率修正因子 ϑ 随固定模离心率 e 的增大而减小。

Abstract

Based on the elastic-plastic forming theory and Finite Element Method (FEM)

a numerical model is established to investigate the forming of spatial tubes in spatial tube bending-twisting process. Investigations are focused on three aspects

including the forming principles of spatial tubes under combined bending and twisting

the variations of forming parameters under different eccentricities of fixed die and the non-linear relationship between the eccentricities of fixed die and the torsion adjustment indexes. The conclusions are: (1) In spatial tubes bending-twisting process

the real bending radius can be influenced by the rotation angles of mobile die and clamp. (2) The equivalent bending points acquired from pure bending are not suitable for spatial tube bending

due to the fact that the torsion adjustment index at equivalent bending point can be influenced by other factors (eccentricity of fixed die

clamp rotation speed

etc). (3) If the twisting angle keeps constant

the torsion adjustment index will increase accordingly with the increasing of clamp rotation speed

and decrease with the increasing of eccentricity of fixed die.

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