Development of ultrasonic complex vibration source using square prism rod with diagonal slits

Abstract

The ultrasonic longitudinal-torsional vibration used in manufacturing technology can be produced from a vibration source containing diagonal slits. The diagonal slits act as a vibration converter that can produce longitudinal-torsional vibration in conjunction with a longitudinal vibration source. The diagonal slits are generally located on the circumference of a cylindrical vibration source. However, the ultrasonic vibration sources used for ultrasonic vibration-assisted manufacturing technology come in various shapes other than cylindrical. Therefore, we investigate a vibration source with diagonal slits in two facing surfaces, which can be used for vibration sources of various shapes. In this study, we investigate the vibration characteristics of an ultrasonic vibration source coupled with a square prism rod containing diagonal slits and assess whether it can produce longitudinal-torsional vibration. From the results, we find that the vibration source has a resonance frequency of 38.6 kHz. When the vibration source is driven at this resonance frequency, the torsional vibration is obtained with an amplitude of roughly 75% that of the longitudinal vibration.