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Research on a hydro-pressing process of tubular parts in an open die

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Abstract

To solve the problems involving in the closed die hydro-pressing process, such as flash and difficulty in taking the part out of the die cavity, an open die hydro-pressing process was proposed. The cross-sectional dimensional accuracy and the corner deformation were experimentally researched. Then, an analysis was employed to reveal the reason for uneven deformation of the section corners, and an effective solution was adopted. The reason is that an obvious difference exists in the bending moment between the four corners due to the existence of the friction. The values of the bending moment and circumferential force decrease gradually along the direction opposite to the movement direction. As a result, the uneven deformation between cross corners appears. A double-pass pressing process was put forward to counter-balance the effects of the friction by converting the direction of the friction force. It is demonstrated by the experiment that the rectangular cross section with high dimensional accuracy can be directly formed from a circular tube blank using the open die hydro-pressing process.

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Funding

The authors would like to thank the financial support from the Program for Changjiang Scholars and Innovative Research Team in University (No. IRT1229) and the National Natural Science Foundation of China (Grant No. 51775134).

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Authors and Affiliations

  1. School of Materials Science and Engineering, Harbin Institute of Technology, Harbin, 150001, China

    Xinlong Zhang, Jiuqiang He & Shijian Yuan

  2. School of Materials Science and Engineering, Harbin Institute of Technology at Weihai, Weihai, 264209, China

    Guannan Chu

  3. National Key Laboratory for Precision Hot Processing of Metals, Harbin Institute of Technology, Harbin, 150001, China

    Jiuqiang He & Shijian Yuan

Authors
  1. Xinlong Zhang
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  2. Guannan Chu
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  3. Jiuqiang He
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Correspondence to Guannan Chu.

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Zhang, X., Chu, G., He, J. et al. Research on a hydro-pressing process of tubular parts in an open die. Int J Adv Manuf Technol 104, 2795–2803 (2019). https://doi.org/10.1007/s00170-019-03893-x

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  • DOI: https://doi.org/10.1007/s00170-019-03893-x

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