Effect of aluminum particle on properties of viscous medium during warm viscous pressure bulging

Viscous pressure forming (VPF) uses a highly viscous but flowable material as pressure-carrying medium (PCM). Due to the relative low flowability of viscous medium compared with fluid, nonuniform pressure distribution in viscous medium can be used to control and regulate the deformation sequence of the workpiece through controlling the loading mode of viscous medium. In the present study, viscous pressure bulge (VPB) tests with three kinds of loading location of viscous medium (central zone, corner zone and the whole deformation zone) are conducted and the influences of loading location of viscous medium on sheet deformation behavior are investigated via numerical simulations and experiments. It is found that changing the loading location of viscous medium can greatly affect the deformation behavior of sheet metal. When the viscous medium is injected from the die corner zone, a local high pressure formed at the corner zone of sheet metal and a higher limiting dome height and strains are obtained.

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Research on Formability of Aluminum Alloy 2024 Sheet by Viscous Pressure Forming

Advanced Materials Research ◽

10.4028/www.scientific.net/amr.634-638.2872 ◽

2013 ◽

Vol 634-638 ◽

pp. 2872-2876 ◽

Cited By ~ 1

Author(s):

Tie Jun Gao ◽

Yao Wang ◽

Jian Guang Liu ◽

Zhong Jin Wang

Keyword(s):

Aluminum Alloy ◽

Pressure Field ◽

Thickness Distribution ◽

Viscous Medium ◽

High Rate ◽

Forming Process ◽

Aluminum Alloy 2024 ◽

Viscous Pressure ◽

Flexible Die ◽

Viscous Pressure Forming

Viscous pressure forming(VPF) using a semi-solid, flowable, highly viscous and certain rate sensitive macromolecule polymer as the forming flexible-die is a good forming method for high strength, low plasticity, complex sheet metal parts. In this paper, the bulging process of aluminum alloy 2024 sheet is carried out by combining methods of experiments with numerical simulation. Influences of viscous medium properties on the geometry of bulging specimens, thickness distribution and the pressure field of viscous medium are analyzed, and the limit bulging heights of aluminum alloy 2024 sheets are obtained. The research results show that choosing viscous medium with high rate sensitivity in the forming process can increase the non-uniformity of viscous pressure field, improve the viscous pressure bulging property of aluminum alloy 2024 sheet, and ameliorate the distribution uniformity of wall thickness of bulging specimens.

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Effects of viscosity on viscous pressure bulging (VPB) of Al1060 sheet

The International Journal of Advanced Manufacturing Technology ◽

10.1007/s00170-015-8172-1 ◽

2015 ◽

Vol 86 (1-4) ◽

pp. 215-225 ◽

Cited By ~ 3

Author(s):

Binxian Yuan ◽

Wa Fang ◽

Jiguang Li ◽

Zhoude Qu ◽

Yujun Cai ◽

...

Keyword(s):

Viscous Pressure ◽

Viscous Pressure Bulging

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Research on Formability of Aluminum Alloy Automotive Panels by Using Viscous Pressure Forming

Advanced Materials Research ◽

10.4028/www.scientific.net/amr.939.355 ◽

2014 ◽

Vol 939 ◽

pp. 355-360

Author(s):

Yi Li ◽

Zhong Jin Wang ◽

Dong Yan Lin ◽

Yan Ping Li

Keyword(s):

Aluminum Alloy ◽

Viscous Medium ◽

Rigid Punch ◽

Sheet Blank ◽

Automotive Panels ◽

Viscous Pressure ◽

Viscous Pressure Forming

The viscous pressure forming (VPF) was applied to form an automotive aluminum alloy panel in this paper. The formability of the panel was investigated. Further, the springback characteristics of the panel were analyzed. The results show that the viscous medium is helpful to improve the flow of the sheet blank. The positive and negative springback occur for the panel formed by VPF. It is different from the panel formed by rigid punch forming, in which only the positive springback occurs. Furthermore, the springback value of the panel formed by VPF is smaller than the latter.

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Finite Element Analysis of Formability of Aluminum Alloy Double-Curved Panel by VPF

Advanced Materials Research ◽

10.4028/www.scientific.net/amr.472-475.817 ◽

2012 ◽

Vol 472-475 ◽

pp. 817-822

Author(s):

Yi Li ◽

Zhong Jin Wang ◽

Yan Ping Li

Keyword(s):

Aluminum Alloy ◽

Stress State ◽

Influence Factors ◽

Viscous Medium ◽

Element Analysis ◽

Blank Holder ◽

Sheet Blank ◽

Curved Panel ◽

State Boundary ◽

Viscous Pressure

To investigate the formability of aluminum alloy panel during the viscous pressure forming (VPF), the stress state and plastic flow of the aluminum alloy double-curved panel during VPF are analyzed by the commercial software ANAYS/LS-DYNA. The influence factors of thickness reduction are also investigated. The results show that the viscous medium is helpful to improve the uniform flow of the sheet blank. From the panel centre to the flange edge, the stress of the sheet blank turns from tensile-tensile stress to tensile-compressive stress. The stress state boundary lies at the edge of the double-curved panel. The formability of the sheet blank can be improved by controlling the blank holder pressure and drawbead height.

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Research of the wrinkling elimination of stainless steel SUS304 by viscous pressure

Engineering review ◽

10.30765/er.39.2.3 ◽

2019 ◽

Vol 39 (2) ◽

pp. 141-147

Author(s):

Tiejun Gao ◽

Xiaojun Liu ◽

Hepeng Zhang ◽

Kun Yu

Keyword(s):

Stainless Steel ◽

Sheet Metal ◽

Evaluation Method ◽

Elimination Rate ◽

Viscous Medium ◽

Forming Process ◽

Forming Precision ◽

Viscous Pressure ◽

Buckling Test ◽

Viscous Pressure Forming

Wrinkling is one of the most important factors influencing a forming precision of sheet metal, which brings difficulties to the forming process of sheet metal. In order to eliminate the wrinkling during the forming process, an accurate prediction is necessary. In this paper, the wrinkling elimination process was investigated based on the principle of the Yoshida Buckling Test (YBT) and viscous pressure forming. The experimental device was designed, and evaluation method of the wrinkling elimination rate was presented by the stainless steel SUS304. On this basis, the wrinkling elimination experiment was carried out, the influences of both the viscous medium molecular weight and the tensile state of wrinkle under the viscous pressure on the wrinkling elimination were obtained.

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