Analysis of electromagnetic force and experiments in electromagnetic forming with local loading

Qiu, Li; Yu, Yijie; Yang, Yuqi; Nie, Xiaopeng; Xiao, Yao; Yan, Ning; Fa-zhi, Wang; Cao, Cheng

doi:10.3233/jae-170038

Cited by 21 publications

(15 citation statements)

References 9 publications

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“…For instance, a uniform pressure coil technique which can generate homogeneous electromagnetic force on the workpiece was introduced in [9] to improve the poor deformation of sheet forming. In [10] a further improvement of sheet forming using electromagnetic force with local loading was presented. Based on the curved surface characteristic of the workpiece, a driving coil matching the structure of the workpiece was developed in [11].This coil can generate electromagnetic force that varies with the surface curvature of the workpiece and hence improving the efficiency of the electromagnetic forming.…”

Section: Introductionmentioning

confidence: 99%

Electromagnetic Force Distribution and Wall Thickness Reduction of Three-Coil Electromagnetic Tube Bulging With Axial Compression

et al. 2020

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In the conventional electromagnetic tube expansion, tube wall thickness tends to decrease significantly while the workpiece is expanded. This paper is aimed at introducing a new technique using three-coil electromagnetic tube bulging with axial compression as an innovative solution for this issue. To validate the feasibility of the proposed technique and investigate the electromagnetic force distribution along the workpiece, COMSOL software is used to construct a detailed finite element analysis model for the proposed electromagnetic coupling model. Results show that the ratio of the axial and the radial electromagnetic forces increases linearly with the increase of the height and the outer diameter of the top and bottom coils. Furthermore, the tube deformation profile and the wall thickness are compared with two different coil structures. Comparison analysis reveals that for the same axial to radial electromagnetic forces ratio, the effect of prohibiting the wall thickness reduction using different coil structures is quite similar. The new method is expected to have a good potential in enhancing the tube-forming performance. INDEX TERMS Electromagnetic forming, tube bulging, axial electromagnetic force, tube wall thickness.

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Section: Introductionmentioning

confidence: 99%

Electromagnetic Force Distribution and Wall Thickness Reduction of Three-Coil Electromagnetic Tube Bulging With Axial Compression

et al. 2020

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“…The purpose of this module is to update the air domain grid in the vicinity of the rings and workpiece to increase the calculation accuracy. The model used in this paper is similar to the model presented by the authors in [14]. Figure 4 shows the electromagnetic force distribution and workpiece forming effect under different loadings.…”

Section: ) Moving Mesh Modelmentioning

confidence: 99%

“…For instance, Daehn and collaborators proposed a uniform pressure driving coil to improve the spatial distribution of the electromagnetic force along the metal sheet [11], [12]. Li Qiu et al proposed a locally loaded EMF method that could achieve uniform forming effect on the workpiece through a concentrated electromagnetic force loading technique [14]. To compensate for the insufficient electromagnetic force on workpieces of low conductivity and improve the forming limit, an additional driver of high conductivity between the driving coil and the workpiece is proposed in [12], [13].…”

Section: Introductionmentioning

confidence: 99%

Electromagnetic Force Distribution and Forming Performance in Electromagnetic Forming With Discretely Driven Rings

Qiu

Abu-Siada

et al. 2020

IEEE Access

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Electromagnetic forming is a method of high-speed metal workpiece forming technology that uses electromagnetic force pulses generated from the interaction of the magnetic flux density and workpiece induced eddy current. The main challenge of this technology is the control of the eddy current and magnetic flux density to perform various forming processes. This paper is aimed at overcoming this challenge by introducing a new electromagnetic sheet forming method based on discretely driven rings. In this method, a set of discrete conducting rings are placed between the driving coil and the metal workpiece to enhance the shaping process of the workpiece. By changing the number and position of the rings, the induced eddy current can be adjusted, and different electromagnetic force distribution profiles can be realized. COMSOL software is used to develop an electromagnetic field-structure coupling model of the proposed electromagnetic forming method. The characteristics of the electromagnetic force distribution and its effect on the workpiece forming process are analyzed. Results show that the electromagnetic force distribution profile can be controlled by adjusting the rings physical parameters such as diameter, material, and position. The proposed method can effectively improve the performance of the conventional electromagnetic forming technology and has the potential for implementation in wide industry applications.

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“…Based on the processing object [12,13], EMF is divided into tube or plate type process [14][15][16]. In both types, uniformity of workpiece deformation has been a sustained issue that has not been fully resolved yet regardless the several attempts presented in the literature [17,18].…”

Section: Introductionmentioning

confidence: 99%

Numerical Analysis of Tube Expansion by Electromagnetic Forming Using Magnetic Field Shaper

et al. 2020

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Uneven axial deformation is the current main issue of the tubes electromagnetic bulging technology which calls for innovative and cost-effective solutions. This paper presents a new method to overcome the above-mentioned issue based on employing a magnetic field shaper. The proposed magnetic field shaper is employed in the middle of the pipe and the driving coil. Induced eddy current control is realized by changing the structural parameters of the magnetic field shaper; thereby regulating the electromagnetic force distribution. The effectiveness of the proposed method is investigated through numerically comparing the electromagnetic performance of two EMF setups; traditional coil-based loading model and magnetic field shaper driving coil-based loading model proposed in this paper. The influence of the magnetic field shaper structural parameters on the tube electromagnetic forming performance is examined for optimum structure design. Results reveal that the concave profile of the radial electromagnetic force in the traditional loading method can be effectively improved using the proposed loading in this paper. The introduction of a magnetic field shaper not only changes the induced eddy current distribution, but also regulates the electromagnetic force profile in the axial-direction of the pipe which effectively enhances the uniform range of the pipe electromagnetic bulging, the maximum uniform deformation area is increased from 9mm to 35mm.

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Analysis of electromagnetic force and experiments in electromagnetic forming with local loading

Cited by 21 publications

References 9 publications

Electromagnetic Force Distribution and Wall Thickness Reduction of Three-Coil Electromagnetic Tube Bulging With Axial Compression

Electromagnetic Force Distribution and Wall Thickness Reduction of Three-Coil Electromagnetic Tube Bulging With Axial Compression

Electromagnetic Force Distribution and Forming Performance in Electromagnetic Forming With Discretely Driven Rings

Numerical Analysis of Tube Expansion by Electromagnetic Forming Using Magnetic Field Shaper

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