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On the High Fluid Pressure in Hydrostatic Forming for Sheet Metal

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International Journal of Precision Engineering and Manufacturing Aims and scope Submit manuscript

Abstract

In hydrostatic forming, technological parameters have a significant influence on the thin shell product formation. One of the most important factors is the forming liquid pressure. This pressure exerts directly on the workpiece, pulling the workpiece closely to the die's profile. Therefore, this parameter should be kept large enough for shaping the product with the required shape and size. In practice, however, it is very difficult to achieve and maintain the high value of this parameter. In addition, it is also necessary to set up a mathematical model of this parameter to support the calculation and control. This paper has suggested a simple solution for maintaining fluid pressure during forming. The solution has been applied into the experimental system. Using this system to investigate forming liquid pressure parameter, the paper has given a suitable mathematical model when shaping cylindrical details from sheet metal. The results of the study contribute to data in die design, parameter calculation and control as well as forming process stabilization in hydrostatic forming for sheet metal.

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Abbreviations

d:

Diameter of die (mm)

D0 :

Diameter of workpiece (mm)

F1 :

The force caused by the blank holder force

F2 :

The force caused by the workpiece sliding on the seal.

Ft :

Tabulated value according to Fisher criterion

Fα :

Adequacy according to Fisher criterion

H*:

Depth of each die (mm)

H*:

Relative depth of die (%)

P:

Forming fluid pressure (bar)

Ppeak :

The maximum forming fluid pressure (bar)

Q*:

Blank holder pressure (bar)

Rc :

Radius of bottom die (mm)

S*:

Relative thickness of workpiece (%)

s0 :

Thickness of workpiece (mm)

x1 :

Coded variation of blank holder pressure

x2 :

Coded variation of relative depth of die

x3 :

Coded variation of relative thickness of workpiece

ρ:

Unit weight (kg/cm3)

σf :

Yeild stress (Mpa)

σm :

Ultimate strength (Mpa)

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Authors and Affiliations

  1. School of Mechanical Engineering, Hanoi University of Science and Technology, No. 1, Dai Co Viet, Hai Ba Trung, Hanoi, Vietnam

    Thu Thi Nguyen & Trung Dac Nguyen

Authors
  1. Thu Thi Nguyen
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  2. Trung Dac Nguyen
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Contributions

Author TNT: Writing—original draft preparation; Design and manufacture of complete testing system; Experiment and analyze data results.

Author TND: Analysis of experimental data; Participate in designing experimental systems.

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Correspondence to Thu Thi Nguyen.

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Nguyen, T.T., Nguyen, T.D. On the High Fluid Pressure in Hydrostatic Forming for Sheet Metal. Int. J. Precis. Eng. Manuf. 21, 2223–2233 (2020). https://doi.org/10.1007/s12541-020-00426-5

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  • DOI: https://doi.org/10.1007/s12541-020-00426-5

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