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Research Papers

Deformation Optimization for Inconel718 Superalloy Sheet Hydroforming Numerically and Experimentally

[+] Author and Article Information
Xu Yong-chao1

Han Cong

Yuan Shijian

 School of Materials Science and Engineering, Harbin Institute of Technology, Harbin, Chinasyuan@hit.edu.cn

1

Corresponding author.

J. Manuf. Sci. Eng 133(6), 061013 (Dec 09, 2011) (8 pages) doi:10.1115/1.4005308 History: Received March 10, 2011; Accepted September 16, 2011; Published December 09, 2011; Online December 09, 2011

For deep cylindrical cups with a large height-diameter ratio, it is difficult to be hydroformed in one stroke. Reverse deep drawing is necessary after deep drawing. Deformation optimization was performed to achieve a large drawing ratio and uniform thickness. An inconel718 superalloy deep cup was investigated numerically and experimentally. For a larger total drawing ratio 3.1, different deformations were analyzed for hydromechanical deep drawing and reverse hydromechanical deep drawing under the condition of different loading paths. Effects of deformations were discussed on the thickness. Typical defects were analyzed for different deformation. Optimal deformation was determined for hydromechanical deep drawing and reverse hydromechanical deep drawing. The results show that a superalloy cup with a total drawing ratio 3.1 could be successfully hydroformed, and the minimum thickness is 0.65 mm.

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Copyright © 2011 by American Society of Mechanical Engineers
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References

Figures

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Figure 1

Geometry of workpiece

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Figure 2

Schematic illustration of sheet hydroforming (a) hydromechanical deep drawing and (b) reverse hydromechanical deep drawing

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Figure 3

Loading paths for hydromechanical deep drawing

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Figure 4

Loading paths for reverse hydromechanical deep drawing

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Figure 5

FE simulation model for hydromechanical deep drawing

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Figure 6

FE simulation model for reverse hydromechanical deep drawing

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Figure 7

Thickness distribution under the different loading paths for FDR = 1.72 (a) loading path A, (b) loading path B, (c) loading path C, and (d) loading path D

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Figure 8

Thickness distributions after hydromechanical deep drawing (a) FDR = 1.55 (b) FDR = 2.0 and (c) FDR = 2.3

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Figure 9

Thickness distribution under the different loading paths for SDR = 1.8 (a) loading path J, (b) loading path K, (c) loading path L and (d) loading path M

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Figure 10

Thickness distributions after reverse hydromechanical deep drawing (a) SDR = 2, (b) SDR = 1.55 and (c) SDR = 1.35

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Figure 11

Tools for sheet hydromechanical deep drawing

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Figure 12

Thickness distribution (a) hydromechanical deep drawing and (b) reverse hydromechanical deep drawing

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Figure 13

Typical defect of wrinkling

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