力负载对超声切割声学系统谐振频率及谐振阻抗的影响

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Abstract The ultrasonic cutting system will be out of harmony, insufficient harmony, or non-resonance when the force is loaded on, it has serious impact on the machining process and the machining quality of the workpiece. In this paper, the impedance and the resonance frequency of the force loaded acoustic system were studied. By using terminal network method, Input / output characteristics of ultrasonic horn, piezoelectric ceramics and end cover were studied, the integral design equation of the acoustic system was presented, and the impedance, frequency equation and the relationship among load, current and amplitude of the acoustic system were obtained. In order to get influence law of force on impedance and resonant frequency, a digital push pull meter was applied to load a single direction force to the acoustic system, the relationship among the impedance, resonant frequency and force was tested by experiments. Experimental results show that the impedance of the system is increased after three directions are loaded on. With the increase in loaded force, the impedance of ultrasonic cutting system loaded Y and Z direction force increases faster than that of the X direction, the increase in resonant frequency of ultrasonic cutting system loaded X and Z direction force is much more than that of Y direction, we should reduce the force of the sensitive direction in practical application. The research results of this paper can provide theoretical guidance for the actual processing.

Key words： ultrasonic cutting system loaded force load model impedance resonance frequency

Received: 15 October 2015 Published: 25 November 2016

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http://jvs.sjtu.edu.cn/EN/ OR http://jvs.sjtu.edu.cn/EN/Y2016/V35/I23/136

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