Ultrasonic vibration bending of metal plate specimens

Ultrasonic vibration bending of a thin metal plate using a 27-kHz-vibration V-type bending die is studied. The 27-kHz vibration die consists of a longitudinal-to-longitudinal vibration-direction converter, four bolt-clamped Langevin type PZT transducers of 50-mm diameter, and four stepped horns. The bending die vibrates vertically to the bending punch and specimen plate. The bending angle is about 90°. Bending-metal specimens used are commercially pure aluminum, anticorrosive aluminum, mild steel, and stainless steel plates of 1.6-mm thickness. The bending angle increases slightly as the die vibration amplitude increases under the same static bending pressure