Composition And Procurement Precautions Of Ultrasonic Welding Machine

Ultrasonic welding machine is composed of ultrasonic generator, ultrasonic transducer, ultrasonic horn, ultrasonic welding head and part support tooling. The first three constitute the ultrasonic welding system

1. Ultrasonic transducer

The function of ultrasonic transducer is to convert power frequency (50 Hz or 60 Hz) voltage into ultrasonic frequency voltage. The transducer transforms the ultrasonic frequency voltage from the generator into ultrasonic mechanical vibration of the same frequency through the inverse piezoelectric effect. When the sinusoidal electrical signal is supplied to the transducer through the electrode, the piezoelectric piece expands and contracts, generating 15~20 μ Axial peak to peak motion of m. When purchasing, pay attention to the material of piezoelectric sheet, which determines the durability and failure rate of the transducer.

2. Ultrasonic horn

The horn has two functions. Its main function is to amplify the mechanical vibration generated at the end of the transducer and transmit the vibration to the welding head. Another function is to provide the position of the fixing kit on the welding press. When ultrasonic energy is applied to the transducer, the horn also expands and contracts. Like other parts in the welding kit, the horn is a tuning device, so it must also resonate at a specific frequency to transmit ultrasonic energy from the transducer to the welding head. In order to play an effective role, the horn must be half wavelength or integral multiple of half wavelength of ultrasonic in its manufacturing material. Generally half wavelength.

3. Ultrasonic welding head

The ultrasonic welding head is the part of the welding kit that provides energy to the parts to be welded. Like the ultrasonic horn, the welding head is also a tuning device, which also provides mechanical amplification in most applications, ensuring that there is enough amplitude at the end of the welding head to realize welding.

The design of parts and joints to be welded determines the size and style of welding head. The shape of the welding head is critical because the stress caused by the axial expansion and contraction of the welding head can cause cracking under high amplitude conditions. When purchasing, pay attention to the welding head structure and processing technology, which affects the manufacturing accuracy of the welding head, and thus affects the deviation of the system resonance. The ultrasonic welding system has several axial slots for the welding head processing, which is to ensure that the amplitude is located in the longitudinal direction.

The ultrasonic welding head shall be designed symmetrically as far as possible to avoid the unbalanced stress and transverse vibration caused by the asymmetry of sound wave transmission because it works under the condition of high frequency vibration.