Investigation into sheet hydroforming based on hydromechanical deep drawing with uniform pressure on the blank

The warm sheet cylindrical deep drawing experiment of aluminum alloy was carried out and macro-mechanical properties and microstructure evolution of hydro-formed cups with different cooling medium were analyzed, which aimed to investigate the effects of different types of cooling on mechanical properties and microstructure of cylindrical cups hydro-formed by warm Hydro-mechanical Deep Drawing (HDD). Results show that, under the condition of warm hydroforming, the mechanical properties such as yield stress and ultimate strength were influenced very little by air or water cooling. Grain coarsening of these hydro-formed cups can be inhibited to a certain extent with subsequent rapid water cooling. Moreover, it shows that the processing with warm sheet hydroforming and subsequent rapid cooling of 7075-O aluminum alloy has a positive significance in maintaining the stability of macro mechanical properties and inhibiting the degradation of the microstructure of materials.

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Hydromechanical Deep Drawing with Uniform Pressure on the Flange

CIRP Annals ◽

10.1016/s0007-8506(07)62932-1 ◽

2000 ◽

Vol 49 (1) ◽

pp. 217-220 ◽

Cited By ~ 15

Author(s):

Joachim Danckert ◽

Karl Brian Nielsen

Keyword(s):

Deep Drawing ◽

Uniform Pressure ◽

Hydromechanical Deep Drawing

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Study on hydromechanical deep drawing with uniform pressure onto the blank

International Journal of Machine Tools and Manufacture ◽

10.1016/j.ijmachtools.2003.10.028 ◽

2004 ◽

Vol 44 (5) ◽

pp. 495-502 ◽

Cited By ~ 22

Author(s):

Lihui Lang ◽

Joachim Danckert ◽

Karl Brian Nielsen

Keyword(s):

Deep Drawing ◽

Uniform Pressure ◽

Hydromechanical Deep Drawing

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Deformation Optimization for Inconel718 Superalloy Sheet Hydroforming Numerically and Experimentally

Journal of Manufacturing Science and Engineering ◽

10.1115/1.4005308 ◽

2011 ◽

Vol 133 (6) ◽

Cited By ~ 1

Author(s):

Xu Yong-chao ◽

Han Cong ◽

Yuan Shijian

Keyword(s):

Deep Drawing ◽

Diameter Ratio ◽

Drawing Ratio ◽

Uniform Thickness ◽

Minimum Thickness ◽

Sheet Hydroforming ◽

Hydromechanical Deep Drawing ◽

Loading Paths ◽

Reverse Deep Drawing

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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