Vibrator Development for Hole Machining by Ultrasonic Longitudinal and Torsional Vibration

Abstract

We are developing a new method using ultrasonic longitudinal and torsional vibrations of a hollow-type stepped horn with diagonal slits for hole machining. We foresee that, with this method, equipment can be simplified and miniaturized. In this study, ultrasonic vibration sources of a horn with diagonal slits and a uniform rod with diagonal slits are used. The longitudinal and torsional vibration characteristics of the horn are studied and the shape of the diagonal slits is examined. As a result, to obtain the maximum torsional vibration at the tip, the diagonal slit conditions were as follows: the center position of the diagonal slits was the position of the node of longitudinal vibration, the angle was 35°, and the depth was 3.5 mm in all cases of cross-sectional ratio. It was clarified that a horn with diagonal slits can be used for hole machining of brittle materials.