Electromagnetic Force Distribution and Forming Performance in Electromagnetic Tube Expansion with Axial Compression

Qiu, Li; Deng, Kui; Yang, Xinsen; Abu-Siada, A.; Xiong, Qi; Yi, Ningxuan; Jiang, Jinbo; Xiao, Li

doi:10.1109/access.2020.3010552

Cited by 6 publications

(4 citation statements)

References 23 publications

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“…Ignoring the influence of the asymptote, the driving coil can be considered as closed conductive rings. The geometry and the electromagnetic field of the driving coil and the sheet have axisymmetric features, which can simplify the electromagnetic forming model into two-dimensional symmetrical axis [22]. In the model, the induced eddy currents in the sheet are mainly dominated by the hoop component as per the equations below:…”

Section: A ''Magnetic Field'' Module Equationmentioning

confidence: 99%

Coil Temperature Rise and Workpiece Forming Efficiency of Electromagnetic Forming Based on Half-Wave Current Method

et al. 2020

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Electromagnetic forming is a well-developed high-rate forming technology. An important issue of this technology is the temperature rise of the driving coil, which can adversely affect the coil service life. This paper is aimed at addressing this issue through detailed investigation of an electromagnetic forming based on half-wave current method. On the basis of the principle of electromagnetic forming and finite element modelling, this paper compares and analyzes the temperature rise profile of the driving coil along with the forming efficiency of the workpiece in the traditional discharge, the crowbar discharge and the halfwave current discharge models. Results show that with the same system discharge parameters, the half-wave current method can reduce the Joule heating of the driving coil from 1.82kJ to 1.3kJ, which effectively reduces the temperature rise of the driving coil. At the same time, the workpiece forming efficiency is improved from 9.6% to 11.8%. Thus, the half-wave current method can solve the issue of the temperature rise of the driving coil to some extent and promote the process of industrial applications of the electromagnetic forming technology. INDEX TERMS Electromagnetic forming technology, half-wave current, Joule heating, temperature rise. CHENGLIN WANG is currently pursuing the Ph.D. degree in electrical engineering with the

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Section: A ''Magnetic Field'' Module Equationmentioning

confidence: 99%

Coil Temperature Rise and Workpiece Forming Efficiency of Electromagnetic Forming Based on Half-Wave Current Method

et al. 2020

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“…To tackle the problem of a tube wall thickness, Qiu et al [20] utilized the axial electromagnetic force to increase the axial flow of the pipe, and a magnetic pulse bulging method with three-coil axial compression was presented. This method is developed further into dual-coil and single coil tube magnetic pulse bulging with axial compression as the implementation of a three-coil system is relatively complicated [21], [22].…”

Section: Introductionmentioning

confidence: 99%

Analysis of Electromagnetic Force and Formability of Tube Electromagnetic Bulging Based on Convex Coil

et al. 2020

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Non-uniform axial deformation and tube wall thinning are the main issues restricting the further development of the tube electromagnetic bulging technology. Aiming at overcoming these issues, a tube electromagnetic bulging method based on convex driving coil is proposed in this paper. An electromagneticstructure coupling model of the tube electromagnetic expansion process is established and the influence of detailed convex coil parameters on radial and axial Lorentz forces are analyzed. Results show that with the new proposed method, the homogeneous length of the tube axial deformation is 4.7 times that of the expansion loading with conventional driving coil. Meanwhile, the issue of tube wall thinning in the conventional electromagnetic bulging method is restrained due to the produced axial electromagnetic force using the proposed convex coil. The proposed tube electromagnetic bulging based on convex coil can effectively overcome the issues currently exist in the conventional tube electromagnetic bulging and promote wide industrial application of the electromagnetic forming technology. INDEX TERMS Electromagnetic forming, tube wall thickness, non-uniform axial deformation.

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“…The main issues associated with the light alloy materials include its low forming properties at room temperature, poor drawability, easy tearing and springback, which complicates the traditional forming processing techniques for such materials [6]. As such traditional forming methods have been replaced by electromagnetic-based techniques that employ EMFs to accomplish the forming-process of alloy materials [7][8][9]. The electromagnetic-forming can effectively enhance the materials' plastic deformation and upturn its forming limit up to 10 times, enhance the stress-distribution on the metal objects and the surface quality of the final product [10][11][12][13][14][15][16].…”

Section: Introductionmentioning

confidence: 99%

Tube Electromagnetic Free Bulging Based on Internal Negative-External Positive Three-Coil System

et al. 2020

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Controlling the direction and profile of the electromagnetic force (EMF) is a key of improving the tube axial-uniformity and wall thickness during the electromagnetic forming process. In this regard, this article proposes a new tube electromagnetic-bulging topology using internal negative-external positive three-coil system. This structure is aimed at realizing effective bidirectional loading of axial and radial EMFs on the tube. An electromagnetic-structure coupling two-dimensional model is proposed to study the effect of the coil structure on the EF profile, bulging profile and the tube wall-thickness. The performance of the proposed method is compared with the traditional method through several performance metrics that include the electromagnetic force distribution cloud map, the tube bulging uniformity and its wall thickness. Numerical simulation results show that by changing the coil structure, the radial EMF profile can be effectively enhanced, and the free bulging contour of the tube can be further regulated. The additional axial EMF due to the proposed structure can promote the axial-flow of the material, thereby suppressing the reduction in the tube wall-thickness which is unavoidable using the traditional method. In comparison to the traditional single-coil system bulging, the maximum axial uniformity range of the tube is increased from 6.5mm to 35.2mm, and the wall thickness of the most severely thinned area is increased from 1.43mm to 1.77mm which verifies the effectiveness of the proposed method.

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Electromagnetic Force Distribution and Forming Performance in Electromagnetic Tube Expansion with Axial Compression

Cited by 6 publications

References 23 publications

Coil Temperature Rise and Workpiece Forming Efficiency of Electromagnetic Forming Based on Half-Wave Current Method

Coil Temperature Rise and Workpiece Forming Efficiency of Electromagnetic Forming Based on Half-Wave Current Method

Analysis of Electromagnetic Force and Formability of Tube Electromagnetic Bulging Based on Convex Coil

Tube Electromagnetic Free Bulging Based on Internal Negative-External Positive Three-Coil System

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