Abstract:In some applications of ultrasonic processing, in order to make the processing range wide and high efficiency, a horn is expected to a large output area.However, the amplification coefficient of the horn with a large output surface is often less than 1.In order to meet the requirement of amplitude amplification factor and stress in actual machining, an inverted cone horn with cuboid hole at the front end was proposed.The displacement distribution law and average amplification factor of the output end were calculated, the amplification factor was greater than that of the solid horn of the same size.The relationship of the amplification factor with geometry of the hole and resonance frequency was studied.The average magnification coefficient of the horn was taken as the objective function to optimize the design and the optimal size of the hole with large amplification factor was obtained.In order to reduce (transverse) and avoid (longitudinal) stress concentration, the four right angles of the cuboid hole were changed to arc angles, which were also analyzed in the paper.
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