Design of a mode conversion type longitudinal-torsional composite ultrasonic vibration machining system

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Journal of Vibration and Shock ›› 2019, Vol. 38 ›› Issue (11) : 242-248.

YIN Sen, ZHAO Bo, LI Yu

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Abstract

The longitudinal-torsional composite ultrasonic vibration applied in cutting and welding can not only achieve a better machining quality, but also significantly improve machining efficiency and prolong tool life. Here, based on the planar harmonic wave propagation theory, the existence of reflected shear wave at spiral grooves was deduced, and the principle of vibration mode conversion for spiral groove structures was further analyzed. A compound amplitude transformer was designed with the numerical analytic method, and spiral grooves were opened on its conical surface to successfully output longitudinal-torsional composite vibration. The effects of spiral groove angle θ, groove width d and depth h on the torsional-longitudinal vibration conversion ratio e were analyzed with the finite element method to optimize spiral groove parameters, and fit the vibration trajectory of a mass point at ends of the transformer. The finite element analysis results were verified with the actual amplitude transformer machined.

Key words

helical slots / vibration transformation / finite element analysis / the torsional - longitudinal conversion ratio e

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YIN Sen, ZHAO Bo, LI Yu. Design of a mode conversion type longitudinal-torsional composite ultrasonic vibration machining system[J]. Journal of Vibration and Shock, 2019, 38(11): 242-248

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