Abstract
Due to the fact that geometrical structure of tube electromagnetic bulging process with field shaper does not conform to the axisymmetric property, three-dimensional (3D) model is usually used to analyze the process which is complicated and time consuming. Therefore, on the basis of understanding the working principle of the field shaper, a two-dimensional (2D) model with current constraint is proposed in this paper to analyze the electromagnetic bulging process of a tube fitted with a field shaper. COMSOL finite element analysis software is used to develop three models for performance analysis and comparison, these are: conventional 3D model and the proposed 2D model with and without current constraint. Simulation results show that the induced eddy current density, magnetic flux density and electromagnetic body density of the two-dimensional model with current constraint are in good agreement with the results of the three-dimensional model. This provides an alternative and effective way to analyze the performance of the tube electromagnetic bulging with field shaper using a simple but yet reliable 2D model.
Highlights
Application of lightweight alloy materials in aviation, aerospace and automobile industry has been given much attention in the last two decades [1]–[3]
FINITE ELEMENT ANALYSIS While the driving coil and tube are of axisymmetric geometrical structure, electromagnetic bulging of the tube with field shaper cannot be directly simplified into a 2D model because of the air gap and the non-axisymmetric structure of the field shaper
It can be observed that the induced eddy current on the inner wall of the field shaper of the 3D-model exhibits a counterclockwise distribution
Summary
Application of lightweight alloy materials in aviation, aerospace and automobile industry has been given much attention in the last two decades [1]–[3]. Electromagnetic forming (EMF) is a kind of high-speed forming technology which employs pulse electromagnetic force to process material forming [7]–[9] This technology has been widely utilized due to its ability to improve the formability of light alloy materials [10]–[13]. L. Qiu et al.: Construction and Analysis of 2D Axisymmetric Model of Electromagnetic Tube Bulging With Field Shaper can effectively improve the radial force in tube compression (bulging). In [23], 2D and 3D models are developed to investigate the influence of the field shaper parameters on the magnetic field and the electromagnetic force distributions on the workpiece. Based on the principle of electromagnetic tube bulging, a 2D axisymmetric simulation model of electromagnetic tube bulging with field shaper is proposed in this paper by introducing current coupling constraint in the region of the field shaper. The parameters of the three models including flux density, induced eddy current of the field shaper and electromagnetic force distribution are analyzed as elaborated below
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