Die Matching Performance of Ultra-Thin Titanium Sheet Driven by Polyurethane During Electromagnetic Forming

Electromagnetic forming of ultra-thin titanium plates requires high conductivity drive plates, resulting in low die matching rates. Rubber is expected to improve the die matching performance because of large deformation characteristics. This paper takes polyurethane and TA1 pure titanium as research objects, and carries out electromagnetic V-bending experiments under different driving modes to explore the influence of polyurethane on die matching performance. The results show that polyurethane can effectively inhibit the rebound of the workpiece while improving the forming uniformity, the average rebound angle is reduced from 14.5° to 9°, and the die matching rate is increased by 37.9%. Electromagnetic V-bending finite element model is established to analyze the mechanism of polyurethane. The results show that polyurethane maintains good contact with the workpiece during the forming period, can provide a longer contact force when colliding with die, and oscillation deformation occurs after collision with die, and the workpiece is subjected to high-frequency oscillating impact force, which effectively suppresses the rebound of the workpiece and improves die matching performance, and springback is reduced nearly 5 times.