Piezoelectric drill based on converse piezoelectric effect

Abstract

A new type of mode convert piezoelectric drill is presented. The drill uses converse piezoelectric effect to work. When exciting voltage is applied on piezoelectric ceramics, the basic structure of the drill will produce longitudinal vibration, which will be converted to local bending vibration by the drill bit fixed on the basic structure with an angle. These two vibrations will be composed to form the elliptical motion. This will provide power for cutting or drilling. The finite element analysis software ANSYS is used to design the structure of the piezoelectric drill, the simulation reveals the cutting locus of the drill under the working frequency. A prototype is manufactured according to the simulation, the laser scanning experiment to the prototype shows that the working frequency of the drill is 56 kHz, namely the cutting motion can reach 3360000 times/min and the cutting amplitude can be limited at micro-size. When the general dental drill is used on the prototype, it can present cutting and drilling on the general print paper, hardboard, aluminum plate, steel plate and so on.