The amplitude of the ultrasonic transducer is a key parameter for the material that needs ultrasonic welding. It is equivalent to the temperature of the ferrochrome. The temperature will not reach the weld. The high temperature will cause the raw material to burn or the structure is damaged and the strength becomes worse. The amplitude of the transducer output is different because of the selected transducer, and the amplitude of the welding head can be corrected by the amplitude lever and welding head suitable for different variable ratio. The output amplitude of the transducer is 10 to 20 mu m, and the working amplitude is generally about 30 mu m, and the ratio of the horn and welding head is the same as the variable amplitude bar and the variable amplitude bar. The shape of the welding head is related to the factors such as the front and rear areas, such as exponential amplitude, functional amplitude, and ladder type, which have great influence on the change ratio, and the area ratio is proportional to the total change ratio. The simplest way of ultrasonic welding machine is to make the size of the welding head and ensure the stability of the amplitude parameter.
The ultrasonic transducer has a central frequency, such as 20KHz, 40 KHz and so on. The working frequency of the welding machine is mainly determined by the mechanical resonance frequency of the transducer (Transducer), the amplitude lever (Booster) and the welding head (Horn). The frequency of the generator is adjusted according to the mechanical resonance frequency to achieve the consistency, so that the welding head is working. The resonant state, each part is designed as a 1.5 wavelength resonant body. Both the generator and the mechanical resonance frequency have a resonant range, such as a generally set of + 0.5 KHz. The welding machine can work normally in this range. When we make each welding head, we will adjust the resonant frequency, which requires that the resonance frequency and design frequency error is less than 0.1 KHZ, such as 20KHz welding head, we weld. The frequency of the head is controlled at 19.90 - 20.10 KH.
For the ultrasonic transducer, there are often many resonant points, the first vibration, the second vibration, the third vibration and so on. Generally, the first vibration (usually the mode of the thick vibration, the mode used by the user) is as far as the second is separated, because the second vibration is the vibration of other modes (such as bending, twisting, etc.) When working in the first vibration mode, the second vibration will also generate vibration, thus affecting the life of the transducer. The farther away they are, the smaller the influence will be.
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