The principle of ultrasonic rubber cutting knife is to convert 50/60Hz current into 20, 30 or 40kHz electric energy through an ultrasonic generator. The converted high-frequency electric energy is again converted into mechanical vibration of the same frequency through the transducer, and then the mechanical vibration is transmitted to the cutting knife through a set of amplitude modulator devices that can change the amplitude. The ultrasonic rubber cutter vibrates along its length with an amplitude of 10-70μm, repeating 40,000 times (40 kHz) per second (the vibration of the blade is microscopic, and it is generally difficult to see with the naked eye). The cutting knife then transfers the received vibration energy to the cutting surface of the workpiece to be cut. In this area, the vibration energy is used to cut the rubber by activating the molecular energy of the rubber and opening the molecular chain.