An improved procedure for manufacture of 3D tubes with springback concerned in flexible bending process

Three dimensional (3D) tubes, which possess the characteristics of space saving, light-weight and high strength, are widely used in many high-end industries such as aviation, aerospace, automobile and shipbuilding. However, when manufacturing a 3D tube in flexible bending process, springback is a big obstacle for improving the forming quality. In this paper, a new comprehensive strategy for springback control of 3D tubes is proposed. The strategy can be described as follows: (1) define the desired shape and manufacture shape; (2) optimize the manufacture shape using two tooling design methods (e.g. DA (displacement adjustment) method and B&T (bending and twist -ing) method presented in this paper); (3) make a discretization of the manufacture shape to acquire the optimized forming parameters. Additionally, experiment is implemented to validate the effec-tiveness of the new strategy. Results show that forming parameters acquired by the new strategy are partially effective. The new strategy also demonstrates that, during 3D tubes forming, the devi-ation caused by over-bent elements can be counteracted by the deficient-bent elements. This prin-ciple is helpful to reduce the difficulty of parameter determination in future. (c) 2020 Chinese Society of Aeronautics and Astronautics. Production and hosting by Elsevier Ltd. This is an open access article under the CC BY-NC-ND license (http://creativecommons.org/licenses/by-nc-nd/4.0/).

Automated summary

This paper proposes a new comprehensive strategy for controlling springback of 3D tubes, which involves optimizing the manufacturing shape and acquiring forming parameters through discretization. Experimental results show partial effectiveness and suggest potential to reduce difficulties in parameter determination in the future.