| Electromagnetic tube sizing is a high rate forming technique which makes use of the characteristics of electromagnetic forming technology.Electromagnetic forming produces a powerful electromagnetic force that makes the tube attaching the mould and deforming for an instant.Compared with the traditional pressure forming,it can greatly improve the formability of difficult forming materials at room temperature.This technology has many advantages such as high accuracy,residual stress,small rebound,costs low,no pollution,good surface quality and so on.So it is suitable for aluminum,magnesium,titanium and other aerial materials.According to the theoretical analysis,finite element simulation and experimental research,this paper mainly studied on the circuit calculation and electromagnetic field calculation.Firstly,it analyzed the influence of the electrical parameters on the current waveform and simulated the electromagnetic sizing process by using the finite element analysis software of Ansoft Maxwell.Secondly,it studied on the induction current,magnetic field,magnetic field distribution and the main process parameters such as voltage,coil turns,coil height by coupling circuit simulation and magnetic field simulation,and studied the influence of the field shaper structure parameters such as shape,diameter,effective area on the distribution of electromagnetic force.Finally,the effects of the discharge voltage and coil turns on the results were studied by electromagnetic sizing experiments,and the roundness and uniformity are regarded as the evaluation criteria for experiment results.Through the above analyses,this paper finds that the discharge voltage controlling discharging energy,the parameters of coils affecting the current waveform,the field shaper improving the local magnetic intensity.Compared with the experimental results,the simulation is proved to be practical,which provides the basis for selecting the technological parameters of the same kind of electromagnetic sizing. |
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