A new piezoelectric ceramic longitudinal-torsional composite ultrasonic vibrator for wire drawing

This paper presents a new sandwich longitudinal-torsional (L&T) composite ultrasonic vibrator for wire drawing. The characteristic of this composite ultrasonic vibrator is driven by an axially poled piezoceramic stack, which is greatly different from the conventional composite ultrasonic vibrator driven by two or more piezoceramic stacks. Four uniform slanting grooves were cut off at the end part of the ultrasonic vibrator to transform the longitudinal ultrasonic vibration into an L&T composite motion. The effects of slanting grooves on the resonance frequency, amplitudes of longitudinal and torsional vibration were analyzed by the finite element method. Experiments were performed to verify the above simulation results. The experimental results met well with the theoretical results. It indicates that L&T composite ultrasonic vibration can be achieved by one piezoceramic stack, and applied in wire drawing. The present work provides a new methodology for ultrasonic wire drawing.