company news about Main Components of Ultrasonic Welding Machine

Ultrasonic welding machine consists of the following parts: generator, pneumatic part, program control part, transducer part. The main function of the generator is to convert the 50HZ power supply into high-voltage radio waves with high frequency, such as 20KHZ. The main function of the pneumatic part is to complete the pressure work needs such as pressurization and keeping pressure in the process of processing. The program control part controls the working process of the whole machine to achieve consistent processing effect. The transducer part converts the high voltage wave generated by the generator into mechanical vibration, after transmission, amplification, and reaches the machined surface.

At present, there are two kinds of generators which are widely used in our country. One is the bridge type power amplifier circuit, which is used by Branson Company of the United States. The protection circuit adopts phase protection, and the working frequency is generally 20kHz. It has the advantages of high efficiency of electric conversion, its disadvantages are the narrow range of frequency regulating inductors and the poor performance of frequency tracking; another disadvantage is that the power can not be done very large, that is, the maximum power is 3KW left vibration friction welding machine right; the other is a Taiwan-type machine. Class B power amplifier, overcurrent protection, bridge feedback is widely used. The advantage is that the power can be larger (E. g. 4.2KWN, good frequency tracking performance, Under the condition of high power, the working frequency of 15 kHz is generally adopted. The disadvantage is that the working frequency of 15kHz is lower than that of the human ear, which reflects the noise. In addition, the machines of frequency automatic tracking in Switzerland, Germany and Japan are also used. Because its price is high, domestic is not common.

The transducer is composed of three parts: the transducer, the booster, the welding horn.

① Transducer: the function of transducer is to convert electrical signal into mechanical vibration signal heat riveting machine number. There are two physical effects that can be used to convert electrical signals into mechanical vibration signals: magnetostrictive effect. Magnetostrictive effect is often used in the early ultrasonic application, which has the advantage of high power capacity and low conversion efficiency, and is difficult to produce in large quantities. B: inverse effect of piezoelectric effect. Piezoelectric ceramic transducer has the advantages of high conversion efficiency and mass production, but its power capacity is small. Piezoelectric ceramic transducers are generally used in existing ultrasonic machines. Piezoelectric ceramic transducers are made of two metals The front and rear load blocks clamp the piezoelectric ceramics in the middle and are made by the screw. The usual output amplitude of the transducer is about 10μ m.

② Booster: the horn is a metal column , through the design of the shape , the amplitude into which the transducer is transferred can be amplified to reach the required energy amplitude of the processed plastic part , which corresponds to the temperature of the heating , and the processing amplitude required by the ABS and AS plastics is about 20μm. The processing amplitude required for nylon and polypropylene is about 50μm.

③ Welding horn: the function of the welding head is to make specific plastic parts, which meet the requirements of plastic parts shape and processing scope.

Transducers, booster, welding horn are designed to work at half the wavelength of the ultrasonic frequency, so their size and shape must be specially designed; any changes may lead to changes in frequency and processing effects, so it is necessary to make them professionally. The size varies depending on the material used. Suitable for ultrasonic transducer, amplitude change rod and welding head materials: titanium alloy, aluminum alloy, alloy steel and so on. Because ultrasonic wave vibrates continuously at high frequency about 20kHz, the requirement of material is very high, which is not acceptable to ordinary materials.

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