Single-driven ultrasonic elliptical vibration turning device

Abstract

The invention discloses a single-driven ultrasonic elliptical vibration turning device, comprising a shell unit, an ultrasonic vibration transducer, an elliptical vibration mode converter and a cutter, wherein the ultrasonic vibration transducer is arranged in the shell unit; the cutter is arranged on the front end of the elliptical vibration mode converter; the shell unit comprises an upper cover plate, a support plate, an external sleeve and a lower cover plate; the ultrasonic vibration transducer comprises a bolt, a rear cover plate, piezoelectric ceramic pieces, an electrode slice and a front cover plate; the rear cover plate, the piezoelectric ceramic pieces, the electrode slice and the front cover plate are sheathed on the bolt in sequence; the rear cover plate and the front cover plate enable the rear cover plate, the piezoelectric ceramic pieces, the electrode slice and the front cover plate to be linked and pressed through the bolt; the elliptical vibration mode converter is arranged on the front end of the front cover plate and is of an oblique wedge-shaped structure; the elliptical vibration mode converter can enable longitudinal ultrasonic vibration generated by the ultrasonic vibration transducer to be converted to the longitudinal-flexural composite ultrasonic elliptical vibration of the end of the elliptical vibration mode converter and the cutter.

Description

technical field [0001] The invention relates to the field of ultrasonic vibration utilizing the inverse piezoelectric effect of piezoelectric ceramics, in particular to a single excitation ultrasonic elliptical vibration turning device. 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 vibration system and control system is complex. , ...

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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 it is necessary to further increase the longitudinal vibration to The conversion of bending vibration, increasing the ratio of the short axis to the long axis of the elliptical vibration track, and improving the cutting effect, it is not ideal to only rely on adding mass blocks and tools on the front end side of the horn, and from the horn to the additional mass Two physical connections are required between the block and the additional mass block to the tool, resulting in a large loss of ultrasonic vibration energy from the piezoelectric transducer to the tool, which affects the cutting effect of ultrasonic elliptical vibration

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