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Theoretical and experimental research on a novel bending process for high-strength steel thin-walled tubes

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Abstract

To avoid wrinkling and cross-sectional distortion in thin-walled tube bending, a novel bending process called tube press bending under gas internal pressure (abbreviated as TGPB) is proposed. In the TGPB process, internal pressure serves a supportive function and generates an additional tensile stress, which can reduce the axial compressive stress on the inner side of the bend, avoiding the occurrence of wrinkles and cross-sectional distortions. Compared with the previous tube bending technologies, the support pressure inside the tube will not change suddenly with the volume change of the tube cavity due to the compressibility of gas. It is suitable for thin-walled tube bending with large, variable axial curvatures and high strength as the shape of the target part is determined by the die cavity. A theoretical prediction model of critical support pressure for TGPB without wrinkling defects is established. The critical support pressure, wall thickness, and section distortion of tubes with different curvatures bent by TGPB are analyzed through FE simulations and experiments, and tubes with different material properties are also done through FE simulations. The results indicate that the tube can be stably bent to the desired shape under the predicted critical support pressure, which is significantly affected by the bending radius and material characteristics, increases with strength coefficient, and decreases with bending radius and strain hardening exponent. A high-strength steel prebending part with complex variable axial curvatures has been successfully formed by TGPB technology under a support pressure of 5 MPa; the minimum and maximum bending radii of which are 846 mm and 2373 mm, respectively.

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Data availability

The data used to support the findings of this study are available from the corresponding author upon request.

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Funding

This study was financially supported by the National Natural Science Foundation of China (52075075) and supported by the Fundamental Research Funds for the Central Universities of China (DUT20RC(5)031) and supported by Liaoning Revitalization Talents Program (No. XLYC1802065). The authors wish to express their gratitude to the funding.

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Authors and Affiliations

  1. School of Mechanical Engineering, Dalian University of Technology, Dalian, 116024, China

    Yanli Lin, Shuo Wang, Quan Qian, Enqi Xu & Zhubin He

  2. State Key Laboratory of High-Performance Precision Manufacturing, Dalian, 116024, China

    Yanli Lin, Shuo Wang, Quan Qian, Enqi Xu & Zhubin He

Authors
  1. Yanli Lin
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  2. Shuo Wang
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  3. Quan Qian
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  4. Enqi Xu
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  5. Zhubin He
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Contributions

YL: conceptualization, methodology, writing—original draft preparation, and funding acquisition. SW: writing—review, editing, software, experiment, and investigation. QQ: experiment and investigation. EX: formal analysis. ZH: supervision and funding acquisition.

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Correspondence to Zhubin He.

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Lin, Y., Wang, S., Qian, Q. et al. Theoretical and experimental research on a novel bending process for high-strength steel thin-walled tubes. Int J Adv Manuf Technol 129, 2457–2474 (2023). https://doi.org/10.1007/s00170-023-12448-0

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