Abstract
An oscillating jet nozzle has been developed to improve the efficiency of water jet cutting. In this nozzle, several piezo-electric transducers attached to a vibration plate give high-frequency oscillation to inner high-pressure water. These transducers were driven by the electric circuit composed of a function generator, an amplifier and a matching box.Firstly, to evaluate the performances of this nozzle, the characteristics of electro-mechanical transformation and mechanical-acoustic transformation were analyzed. Equations which could estimate the vibration velocity, sound pressure and cutting speed were derived by simplified model of this nozzle.Secondly, photographic studies of oscillating jets and cutting experiments were done. These results were compared with analytic results qualitatively. Main results were as follows.1) In case that oscillation frequency was constant, wave length became longer according to the increase of the water jet velocity.2) Increase of the water jet velocity reduced the wave amplitude of oscillating jet under the constant electrical power.3) Mass loss increased with growing the electrical power which supplied to piezo-electic transducers, but there was a saturation point in electrical power-mass loss curve.4) In this study, by using oscillating jet the increment of mass loss was recognized from stand-off distance of 30 to 180.
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