Experimental study on the effect of tool parameters on the vibrational characteristic of ultrasonic vibration-assisted drilling system

In ultrasonic vibration-assisted drilling (UVAD), the processing stability is strongly influenced by the ultrasonic vibration system's vibrational characteristics. The effect of tool parameters on UVAD's vibrational characteristic was experimentally studied and theoretically analyzed in this paper. Firstly, a measurement experiment was designed to assess the above effect in three various tools under different loads. The relationship between the ultrasonic power and amplitude was used to indirectly monitor the ultrasonic amplitude variation, which was corroborated by the UVAD test results. The ultrasonic amplitude and power were mainly controlled by the stiffness coefficient, while the damping coefficient effect could be ignored. Furthermore, the tool vibration frequency exhibited an increasing trend with the load value. Finally, the effects of the stiffness coefficient and damping coefficient on the vibrational characteristics were theoretically substantiated. The results of this study are considered instrumental in selecting tool and process parameters in ultrasonic machining.