关键词: 电磁成形, 2219铝合金, 跑道型线圈, 磁场调控

Abstract:  In order to effectively regulating the deformation behavior of aluminum alloy sheet in electromagnetic forming processes of track coil, the influences of the relative position of the sheet metal and the coil assembly on the electromagnetic force, current density, deformation velocity and forming height were revealed by experimental-simulation and theoretical calculation. An engineering calculation model of the magnetic induction intensity in central plane of the coil was derived. With the increase of the offset in sheet assembly, the maximum height difference of the deformation zone of the electromagnetic forming specimen gradually decreases, and the specimen changes from “low inside and high outside” to “high outside and low inside”. The peak electromagnetic force density moves from the inside of the sheet metal to the center. When the offset amount is as 2.5~3.0 mm, there is a minimum value for the height difference between the two sides. When the offset is as 3.0 mm, the lateral deformation speed of the sheet metal tends to be 0, and the electromagnetic force is axisymmetrically distributed along the center of the sheet. Based on the engineering model of the magnetic induction intensity of the track coils, the relationship among the position of the symmetrical center region of magnetic inductance and the half length of the straight section of the coil, the turn spacing, the center distance the sheet assembly clearance was deduced, and the optimal offset is as 2.2~3.9 mm. This results are consistent with the simulation experimental ones and confirm the reliability of the model.

Key words: electromagnetic forming, 2219 aluminum alloy, track coil, magnetic field regulation