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A Study on the Impact of Blank Holder Pressure on Forming Pressure and Product Quality in Hydrostatic Forming

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

Abstract

Forming process and product quality in hydroforming of sheet metal have been considered to be significantly influenced by numerous technological parameters, and one of those is blank holder pressure. This parameter keeps an important role in not only maintaining stability on rim of workpiece but preventing leakage of high-pressure liquid as well. In this paper, a parametric study was conducted to investigate a relationship between the blank holder pressure and forming pressure during the shaping process. Moreover, effect of the blank holder pressure on product quality was also experimentally scrutinized through thinning and real shapes of different finished products. The researched object was chosen to be a cylindrical cup made of steel DC04 with various thicknesses. The experiments were implemented for two cases of the blank holder pressure during forming process: constant and varied pressures. The results indicate a covariant relationship between the blank holder pressure and forming pressure. Furthermore, it should be noted that the forming pressure can be maintained at higher values in the case of varied blank holder pressure, thereby improving shape quality and thinning rate of the product. The relationship between two types of pressure as well as impact of the blank holder pressure on the bottom radius and the maximum thinning of the product is demonstrated as functions through empirical studies. This study is believed to make contribution to optimizing technological parameters within forming process to manufacture high-quality products.

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Abbreviations

CBP:

Constant blank holder pressure

d:

Diameter of die (mm)

Ft :

Tabulated value according to Fisher criterion

Fα :

Adequacy according to Fisher criterion

h:

Depth of die (mm)

N:

Total number of experiments

n0 :

Number of repetitions in plan central.

nk :

Number of change of variables

nα :

Number of symmetrically positioned points at plan central.

P:

Forming pressure (bar)

Pmax :

Maximum forming pressure (bar)

Q:

Blank holder pressure (bar)

s0 :

Thickness of workpiece (mm)

smin :

Minimum thickness on the product

VBP:

Varied blank holder pressure

x 1 :

Coded variation of blank holder pressure

x 2 :

Coded variation of workpiece thickness

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Acknowledgements

This research is funded by Hanoi University of Science and Technology (HUST) under Project number T2022-PC-019.

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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

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  1. Thu Thi Nguyen
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  2. Trung Dac Nguyen
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Contributions

TNT: analysis of experimental data, and design of design and manufacture of a complete the experimental system; writing the original manuscript. TND: writing and editing the manuscript. All authors read and approved the final manuscript.

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Correspondence to Thu Thi Nguyen.

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12541_2022_740_MOESM1_ESM.xlsx

Determination of the regression function of the forming pressure was performed according to the orthogonal second order design method, and the sequence is provided in Additional file 1

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Nguyen, T.T., Nguyen, T.D. A Study on the Impact of Blank Holder Pressure on Forming Pressure and Product Quality in Hydrostatic Forming. Int. J. Precis. Eng. Manuf. 24, 187–198 (2023). https://doi.org/10.1007/s12541-022-00740-0

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