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Forming mechanism of leaf-like integral outside finned tubes via sequential knurling and cutting-bending method

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Abstract

Sequential knurling and cutting-bending method is proposed to manufacture leaf-like integral outside finned tubes (LIOFT). The numerical analysis method was used to explore the material fracture and plastic forming processes. Single-factor experiments were used to establish quantitative relationships between process parameters and forming quality to guide the design of experimental parameters. The results of the numerical analysis revealed that the teeth of the knurled tube were cut by the tool’s main cutting edge and then slide-bent along the rake face and minor cutting edge during the forming process. The knurling direction significantly affects the fin height and shift, a reasonable knurling direction increases the fin height by 40.1% while reducing the fin shift by 94.0%. Increasing the friction coefficient and tool feeding speed slightly increases the fin height but reduces the fin strength and finning ratio. The combination of experimental parameters was optimized based on the numerical analysis results, and a LIOFT with a maximum fin height of 3.46 mm was manufactured accordingly.

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Funding

The authors acknowledge the financial support for the Postdoctoral Research Station Research Projects of Guangdong JIEA Metal Co., Ltd., with project number JIEA-RD-2022–01.

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Authors and Affiliations

  1. School of Mechanical and Automotive Engineering, South China University of Technology, Wushan Road 381, Guangzhou, 510640, Guangdong, China

    Yang Zou & Yong Tang

  2. Department of Technology Administration, Guangdong JIEA Metal Co., Foshan, 528000, China

    Yang Zou & Guiqing Guo

  3. Department of Mechanical Engineering, The Hong Kong Polytechnic University, Hongkong, 100872, China

    Kairui Tang

Authors
  1. Yang Zou
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  2. Kairui Tang
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  3. Guiqing Guo
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  4. Yong Tang
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Contributions

Yang Zou offered conception, conducted the numerical analysis, performed the data analysis and wrote the paper. Kairui Tang put forward significant comments for manuscript preparation and revision. Guiqing Guo offered indispensable experimental conditions. Yong Tang put forward significant guidance for the research. The manuscript was completed through contributions from all authors, and all authors approved the eventual manuscript.

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Correspondence to Yang Zou.

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Zou, Y., Tang, K., Guo, G. et al. Forming mechanism of leaf-like integral outside finned tubes via sequential knurling and cutting-bending method. Int J Adv Manuf Technol 131, 3729–3737 (2024). https://doi.org/10.1007/s00170-024-13194-7

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  • DOI: https://doi.org/10.1007/s00170-024-13194-7

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