Low-voltage high-current ultrasonic impact apparatus

Abstract

The invention discloses a low-voltage high-current ultrasonic impact apparatus. The apparatus comprises a force application device, a piezoelectric ceramic energy transducer and an amplitude transformer which are sequentially arranged in a shell, the amplitude transformer is connected with the piezoelectric ceramic energy transducer, the top of the amplitude transformer has a work head, the number of ceramic chips of the piezoelectric ceramic energy transducer select chips is an even number in a range of 14-30, the thickness of the ceramic chips is 0.5-3mm, and the ceramic chips comprise full-wavelength ceramic chips and half-wavelength ceramic chips. The apparatus can effectively change the low-voltage high-current unstable and extremely unsafe work mode of present piezoelectric ultrasonic surface processing apparatuses, substantially reduces the load impedance, increases the resonance bandwidth, improves the frequency tracking condition, improves the effective power output and also greatly reduces the work voltage, so the operating safety is guaranteed, and the apparatus is suitable for high-strength structural members; and additionally, the improvement of the heat radiation condition of the energy transducer realizes the reduction of the load impedance and the prolongation of the service life of the energy transducer.

Description

technical field [0001] The invention relates to the technical field of improving fatigue performance of mechanical structures, in particular to a low-voltage and high-current ultrasonic impact device. Background technique [0002] At present, methods such as TIG melting, hammering and shot peening are mainly used at home and abroad to improve the fatigue performance of mechanical parts and structures, but these methods are labor-intensive, energy-consuming and will have negative effects. Ultrasonic impact is suitable for various joints because of its light and handy actuator, good controllability, flexible and convenient use, minimal noise, high efficiency, less application restrictions, low cost and energy saving. Methods to improve the fatigue performance of welded joints. The introduction of the half-wavelength ultrasonic impact method solves the problem of processing narrow spaces such as the inner wall of the pipeline or special locations, making the ultrasonic impact ...

AI Technical Summary

Problems solved by technology

[0003] The existing full-wavelength and half-wavelength piezoelectric ultrasonic shock devices are both high-voltage and low-current working methods, and the instantaneous detuning voltage can reach thousands of volts, which is extremely unsafe, especially in underwater environments. During operation, it poses a great threat to the personal safety of operators

At the same time, the load impedance in this working mode is generally relatively large, the resonant frequency band is relatively narrow, and the frequency tracking conditions are extremely harsh, so that the system cannot always work in the best resonant state, thus greatly reducing the output of effective power.

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