Electromagnetic forming device and method for providing continuous electromagnetic force

Abstract

The invention discloses an electromagnetic forming device for providing continuous electromagnetic force. The electromagnetic forming device for providing the continuous electromagnetic force comprises a concave die, a coil and a discharging loop. The coil is arranged on the concave die, a sheet to be formed is arranged between the concave die and the coil, the coil is electrically connected withthe discharging loop, the discharging loop comprises a steady-state magnetic field discharging loop capable of generating a steady-state magnetic field and an alternating magnetic field discharging loop capable of generating an alternating magnetic field, and the steady-state magnetic field discharging loop and the alternating magnetic field discharging loop are electrically connected with the coil separately. The invention further discloses an electromagnetic forming method. The electromagnetic forming method comprises the steps of discharging of the steady-state magnetic field discharging loop, discharging of the alternating magnetic field discharging loop, superimposing of the current generated by the steady-state magnetic field discharging loop and the current generated by the alternating magnetic field discharging loop, obtaining induced eddy current by induction of alternating pulse current, forming completing of the sheet under the action of magnetic field force and the like. The electromagnetic forming device for providing the continuous electromagnetic force has the advantages of being high in forming efficiency and good in forming precision, effectively avoiding sheet rebound, being capable of providing the continuous electromagnetic force, accurately regulating and controlling the electromagnetic force to realize flexible manufacturing and the like.

Description

technical field [0001] The invention belongs to the field of material processing, and in particular relates to an electromagnetic forming device and method for providing continuous electromagnetic force. Background technique [0002] The traditional "electromagnetic forming" technology, also called "electromagnetic pulse forming" technology, is a method of high-speed machining of metal workpieces using pulsed electromagnetic force. In the traditional electromagnetic pulse shaping process, capacitors, coils, and discharge circuits constitute an RLC circuit. Energy is stored in the capacitor, and when the discharge switch is closed momentarily, a decaying alternating current will flow through the coil. This alternating current will get an induced current on the surface of the metal workpiece opposite to the direction of the coil current, thereby generating a pulsed electromagnetic force on the workpiece, see figure 1 (For details, see the literature "some measurements of the...

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Problems solved by technology

This pulse electromagnetic force has the following two problems: (1) The pulse electromagnetic force mainly acts on the deformation of the material in the first half wave, and the other half waves can be ignored due to the large attenuation of the electromagnetic force, so the magnetic field force acts for a short time and the forming efficiency is low ; (2) The pulse current increases from the initial value of 0, causing the electromagnetic force to increase slowly

However, multiple discharges and multiple sets of coil structures required to improve precision will weaken the forming efficiency

And for high-hardness materials, the high-speed collision between the material and the mold driven by magnetic field force still cannot solve the problem of rebound after high-speed collision, which will eventually affect the forming accuracy

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