Nowadays difficult-to-cut materials are widely used in industrial products such as automobile parts or aerospace parts. Thus, ultrasonic-assisted machining comes into the limelight for machining difficult-to-cut materials. Ultrasonic-assisted machining is a process that uses high-frequency vibration to the cutting tool to enhance the cutting force and surface integrity. The most important part of an ultrasonic machine device is the transducer, which generates ultrasonic vibrations. A high-frequency electrical signal is transformed into vibration motion in the ultrasonic transducer. However, during this process, heat is generated from the piezoelectric. The vibration amplitude of the ultrasonic transducers is reduced by this heat generation, which also changes the resonance frequency. Therefore, it needs a coolant when operating the ultrasonic transducer. The heat transfer in the operational condition of the ultrasonic transducer is examined in this paper with an infrared camera. Compare the conditions with and without coolant as well. Additionally, when the piezoelectric is in a high-temperature state, use an impedance analyzer to find the change in resonance frequency. The resonance frequency decrease by 0.91 % and the amplitude decreases by 32.9 % as the temperature reaches 70°C.

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