Introduction and working principle of ultrasonic cutting knife
1. Introduction of Ultrasonic Cutter
Ultrasonic cutting knife machine is a kind of equipment that uses wave energy to perform cutting processing. Its characteristic is that cutting does not require cutting edges. In other words, the cutting edge in the traditional sense is not used. Traditional cutting uses a knife with a sharp edge to press against the material to be cut. This pressure is concentrated at the cutting edge, and the pressure is very large, exceeding the shear strength of the material to be cut, and the molecular bonds of the material are pulled apart and cut.
Since the material is pulled apart by strong pressure and rigidity, the cutting edge of the cutting tool should be very sharp, and the material itself has to withstand relatively large pressure. The cutting effect is not good for soft and elastic materials, and it is more difficult for sticky materials.
Ultrasonic cutting has another great advantage, that is, it has fusion in the cutting part while cutting. The cutting part is perfectly sealed, which can prevent the loosening of the cut material (such as the flash of textile materials).
2. Working principle of ultrasonic cutting knife
The principle of ultrasonic cutting machine is completely different from traditional cutting. It uses ultrasonic energy to heat and melt a part of the material to be cut, so as to achieve the purpose of cutting the material. Therefore, ultrasonic cutting does not require a sharp edge, nor does it require a lot of pressure.
Will not cause chipping or breakage of the material being cut. At the same time, because the cutting knife is vibrating ultrasonically, the frictional resistance is particularly small, and the material to be cut is not easy to stick to the blade. This is particularly effective for cutting viscous and elastic materials, frozen materials such as food, rubber, etc., or objects that are inconvenient to apply pressure.
The basic composition of an ultrasonic cutting machine is an ultrasonic transducer, an booster, a cutting knife (horn), and a driving power supply. The ultrasonic drive power converts the mains electricity into high frequency and high voltage alternating current, which is output to the ultrasonic transducer. The ultrasonic transducer is actually equivalent to an energy conversion device, which can convert the input electrical energy into mechanical energy, that is, ultrasound.
Its manifestation is that the transducer stretches back and forth in the longitudinal direction. The frequency of the telescopic movement is equal to the frequency of the high-frequency alternating current supplied by the driving power supply. The role of the booster is to fix the entire ultrasonic vibration system, and the other is to amplify the output amplitude of the transducer. On the one hand, the cutting knife (horn) further amplifies the amplitude and focuses the ultrasound.
On the other hand, it outputs ultrasonic waves, and uses the similar cutting edge of the cutting knife to concentrate the ultrasonic energy into the cutting part of the material to be cut. Under the action of huge ultrasonic energy, this part instantly softens and melts, and its strength is greatly reduced. At this time, as long as a small cutting force is applied, the purpose of cutting the material can be achieved.
Similar to conventional cutting, the basic components required are a cutter and anvil. The ultrasonic cutting machine also has two basic structures. According to the different ultrasonic application position, it can be divided into ultrasonic cutter type cutting machine and ultrasonic anvil type cutting machine.
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