Research on Process Window Diagrams of Tube-Compression by Viscous Pressure Forming

Gao, T.; Liu, Yang; Wang, Zhongjin

doi:10.1007/s11665-014-1020-x

Cited by 5 publications

(2 citation statements)

References 10 publications

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“…Viscous pressure forming is an advanced forming technology that can eliminate wrinkles, decrease thinning, and reduce spring back of the sheet [34,35,37]. In viscous pressure forming, the pressure-carrying medium is semi-solid.…”

Section: Introductionmentioning

confidence: 99%

Mechanism and experimental verification of non-uniform pressure in viscous pressure forming

Wang,

2024

Preprint

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The plastic deformation of the complex thin-walled components is not uniform. Applying a non-uniform load can decrease the thickness reduction and improve the thickness uniformity. In recent years, the application of non-uniform pressure to deform the sheet (such as magnetorheological pressure forming and viscous pressure forming) has attracted researchers’ attention. However, the characteristics of the non-uniform pressure have not been researched. Control of the non-uniform pressure in the forming process lacks theoretical support. In this study, the mechanism of the non-uniform pressure in the viscous pressure bulge test is investigated. The pressure-carrying medium, called viscous medium, is semi-solid and flowable. The inhomogeneous flow behavior of the medium produces non-uniform pressure when the maximum is at the bulged pole. The inhomogeneous deformation behavior of the medium produces non-uniform pressure when the minimum is at the bulged pole. The effects of flow and deformation are opposite. The non-uniform pressure function is derived, and the evolution of the pressure is presented. During forming, the viscosity of the medium increases with the pressure, so the effect of the flow behavior increases, and the pressure weight at the pole increases. Viscous pressure bulge tests are carried out to verify the theory. The gradient and evolution of the pressure can be controlled by the loading velocity and the property of the medium. The results provide theoretical guidance for the control of the pressure in viscous pressure forming, and the methodology is expected to analyze the non-uniform pressure in other flexible die forming processes.

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Section: Introductionmentioning

confidence: 99%

Mechanism and experimental verification of non-uniform pressure in viscous pressure forming

Wang,

2024

Preprint

Self Cite

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“…However, due to the influence of the material properties and geometry of parts, sheet metal is easy to produce defects such as wrinkling or fracturing during the forming process. Therefore, the way to control the forming parameters to avoid wrinkling or fracturing has become the key to improve the forming quality of a sheet with complicated shape [1][2][3][4]. Generally, fracture is caused by the tensile instability during forming process, which can be solved through prediction methods such as forming limit diagram, maximum thickness thinning rate criterion, strain rate catastrophe criterion, and appropriate forming parameters or forming methods.…”

Section: Introductionmentioning

confidence: 99%

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

Gao

Liu

et al. 2019

Eng. rev. (Online)

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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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Formability and performance of 6K21-T4 aluminum automobile panels in VPF under variable blank holder force

Zheng

Wang

Liu

et al. 2017

Int J Adv Manuf Technol

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Research on Process Window Diagrams of Tube-Compression by Viscous Pressure Forming

Cited by 5 publications

References 10 publications

Mechanism and experimental verification of non-uniform pressure in viscous pressure forming

Mechanism and experimental verification of non-uniform pressure in viscous pressure forming

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

Formability and performance of 6K21-T4 aluminum automobile panels in VPF under variable blank holder force

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