Single-excitation ultrasound oval vibration turning device

Abstract

The invention provides a novel single-excitation ultrasound oval vibration turning device. The single-excitation ultrasound oval vibration turning device comprises a shell unit, an ultrasonic vibration transducer arranged in the shell unit, an oval vibration mode converter and a cutter arranged at the front end of the oval vibration mode converter. The shell unit comprises an outer sleeve, a top plate and a bottom plate, wherein a supporting plate is connected with the outer sleeve in a welding mode or through screws and used for being connected with a lathe cutter rest. The ultrasonic vibration transducer is cylindrical overall and comprises an upper covering plate, a piezoelectric ceramic piece, an electrode piece and a lower covering plate, wherein the electrode piece is connected with an ultrasonic power source, the upper covering plate, the piezoelectric ceramic piece, the electrode piece and the lower covering plate are pressed tightly through bolts to form an energy conversion part of the ultrasonic vibration transducer, ultrasonic electric signals output by the ultrasonic power source are converted into longitudinal ultrasonic vibration of the ultrasonic vibration transducer, and the upper surface of the upper covering plate is connected with the oval vibration mode converter.

Description

technical field [0001] The invention relates to the field of ultrasonic vibration machining using the inverse piezoelectric effect of piezoelectric ceramics, in particular to a precision turning device that uses single excitation ultrasonic elliptical vibration for auxiliary machining. Background technique [0002] Ultrasonic elliptical vibration is widely used in the fields of ultrasonic vibration cutting, ultrasonic welding, ultrasonic grinding, ultrasonic polishing, linear ultrasonic motor and rotary ultrasonic motor. At present, most researchers use two vibration forms of longitudinal vibration, torsional vibration, bending vibration and radial vibration to combine to generate ultrasonic elliptical vibration. If there are two or more vibration modes, each group of piezoelectric ceramic sheets must be equipped with an ultrasonic drive power signal, and the phase difference between the ultrasonic drive power signals needs to be controlled. The structure of the ultrasonic v...

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Problems solved by technology

At present, most researchers use two vibration forms of longitudinal vibration, torsional vibration, bending vibration and radial vibration to combine to generate ultrasonic elliptical vibration. If there are two or more vibration modes, each group of piezoelectric ceramic sheets must be equipped with an ultrasonic drive power signal, and the phase difference between the ultrasonic drive power signals needs to be controlled. The structure of the ultrasonic vibration system and control system is complex. , high manufacturing difficulty, high control difficulty, high production cost, difficult miniaturization, and unstable working performance, these problems restrict the application and promotion of ultrasonic elliptical vibration transducers in industrial production

[0003] In order to overcome the deficiencies in the above-mentioned ultrasonic elliptical vibration transducer technology, the paper "Elliptic Vibration Cutting Transducer Based on Finite Element Analysis" of "Journal of Beijing University of Aeronautics and Astronautics" in February 2005, Volume 31, No. 2, proposed a An ultrasonic elliptical vibration cutting transducer with an asymmetric structure excited by a single electric signal, and the finite element dynamic analysis and experimental research on the transducer have achieved good experimental results, but further improving the single excitation ultrasonic elliptical The conversion efficiency of the vibration system from the longitudinal vibration to the bending vibration can improve the ratio of the short axis to the long axis of the elliptical vibration track and improve the cutting effect. Two physical connections are required from the horn to the additional mass and from the additional mass to the tool, resulting in a large loss of ultrasonic vibration energy from the piezoelectric transducer to the tool, which affects the ultrasonic elliptical vibration cutting effect

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