Abstract
The coil is the most important component in electromagnetic forming. Two important questions in electromagnetic forming are how to obtain the desired magnetic force distribution on the sheet and increase the service life of the coil. A uniform pressure coil is widely used in sheet embossing, bulging, and welding. However, the coil is easy to break, and the manufacturing process is complex. In this paper, a new uniform-pressure coil with a planar structure was designed. A three-dimensional (3D) finite element model was established to analyze the effect of the main process parameters on magnetic force distribution. By comparing the experimental results, it was found that the simulation results have a higher analysis precision. Based on the simulation results, the resistivity of the die, spacing between the left and right parts of the coil, relative position between coil and sheet, and sheet width significantly affect the distribution of magnetic force. Compared with the structure and magnetic force on a traditional uniform pressure coil, the planar uniform pressure coil can produce a uniform magnetic force distribution on the sheet, reduce the manufacturing difficulty, reduce manufacturing cost, and enhance the service life for the coil.
Highlights
In electromagnetic forming (EMF), the coil is a key component that converts the electrical energy stored in a capacitor into the kinetic energy required for the deformation of a workpiece
Cui et al [1] found that electromagnetic tube bulging with multidirectional magnetic pressure can decrease the tensile stress and thickness at the broken position on a tube
Several steps of quasi-static stamping and magnetic-pulse forming with radial force improve the used the spiral circular coil with tower type and multidirectional magnetic pressure to reduce the forming depth by 31% compared to quasi-static stamping
Summary
In electromagnetic forming (EMF), the coil is a key component that converts the electrical energy stored in a capacitor into the kinetic energy required for the deformation of a workpiece. Cui et al [7] used two flat spiral-waisted coils and a small discharge et al [6] placed a flat spiral circular coil at the sheet-metal end to generate radial magnetic pressure. Cui et al [8] used the spiral circular coil with tower type and multidirectional to make sheet-free bulging and the formed flat insert. A new type of actuator that provided a uniform pressure distribution on a sheet was channel is in close contact with the sheet metal, generating the induced current on an outer channel proposed by Kamal et al [11]. Cui et al [17] analyzed the distribution of magnetic force on a sheet and designed coil can be used for electromagnetic forming and magnetic pulsed welding. A new uniform-pressure coil with a planar structure was designed in this study
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