ULTRASONICALLY VIBRATED DIE AND METHOD OF ITS OPERATION

摘要

An ultrasonically vibrated die (1) for forming tubular metal workpieces comprises a die ring (2) supported coaxially on a resonant tube (4). A transducer (16) applies ultrasonic vibrations to the die ring (2). The resonant tube (4) is mounted on a forming machine via a radial flange (6). The location of the mounting flange (6) along the resonant tube (4) is chosen to be at an antinode, where the amplitude of the radial vibration of the tube (4) is at a local maximum. This avoids axial and twisting movement of the flange (6), which would tend to couple the vibrations of the die (1) to the machine.