The coil design and forming processes of electromagnetic flanging of conical holes were achieved by establishing a finite element model using LS-DYNA finite element simulation software.A coil with variable turn spacing was designed,and the optimal discharge voltage was determined to in-vestigate their influence on formability.Subsequently,a processing test was conducted to obtain parts meeting technical requirements.The results demonstrate that utilizing a coil with variable turn spacing design increases the electromagnetic force density in the small circle area,significantly enhances the forming height in this region,and improves overall forming uniformity.As voltage increases,there is an accompanying increase in electromagnetic force;consequently,there is rapid reduction in die gap within the small arc regions while remaining almost unchanged within large arc regions.Additionally,die gap within straight side regions rebounds after initial decrease.The optimum discharge voltage of 14 kV results in a maximum die gap of 0.61 mm and thinning rate of 18％,so that technical require-ments are met.
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