Analysis of the variation regularity of the parameters of the discharge circuit with the distance between workpiece and inductor for electromagnetic forming processes

The discharging current of the discharge circuit is obtained by measuring the voltage of a current divider for electromagnetic forming processes. The variation regularity of the parameters of the discharge circuit with the distance between workpiece and inductor h is analyzed by means of the data fitting method. It is found that the discharging current parameters, the equivalent inductance of workpiece–inductor system LE and its active resistance RA vary with h in exponential regularity. With h increasing, the peak value of discharging current IP, the damping coefficient β and RA decrease, however, the time of the peak discharging current TP, the first half-wave time of discharging current TH and LE increase. Among the parameters of the discharge circuit, the variation of IP with h is the weakest, however, β is the sharpest. The curve shapes of TH and LE are most similar.