Ultrasonic Fixture Production (2)

Ultrasonic Fixture Production (2)

Date:Jul 31, 2019


Ultrasonic Fixture Production (2)


Improper processing of the horn or the use of untuned horns can damage the welding process and cause costly damage to the production, which can directly lead to damage to the transducer or amplifier.

Altrasonic complete welding head detector, analyzer and other complete testing equipment, strict outbound quality inspection process, the first time to ensure the quality of ultrasonic welding head.


Welding head / mold making principle:

Sonic mold/welding head is customized according to the product. Design is a very complicated work, which needs to be considered according to the material, size, machine frequency and acoustic principle. Simply put, the purpose of ultrasonic mold grooving is to destroy the transverse wave generated in the ultrasonic transmission. Generally, the groove is at the wavelength of 1/2 transverse wave, which is mainly considered according to the acoustic principle. As for the mold/welding head, why should the width of the upper and lower sides be different, mainly considering increasing the output, the principle is similar to the amplification of the sound wave output. A good mold/welding head is an important prerequisite for welding stability. If the mold/welding head design is not good, it will lead to some welding problems, such as uneven welding, mold heating, noise, and even cracking!

 

The longitudinal resonance frequency of the ultrasonic mold/welding head is also its operating frequency, which must be consistent with the resonant frequency of the transducer vibration system, otherwise it will cause the longitudinal working efficiency of the vibration system to decrease. The lateral resonance of the tool must be suppressed as much as possible. The vibration of the mold/welding head can be divided into the following three states:

 

1. The transverse dimension of the ultrasonic mold/welding head is much smaller than the longitudinal dimension. Generally, it is required to be more than 2 times. The lateral resonance frequency is much higher than the longitudinal resonance frequency. Therefore, the lateral vibration has little effect on the longitudinal vibration. Why should the ultrasonic mold/welding head be The slotting tool vibration is similar to the one-dimensional longitudinal vibration of the elongated rod in the Z direction. At this time, the one-dimensional theory can be used to design the ultrasonic mold/welding head to meet the practical accuracy requirements.

 

2. Of the two transverse dimensions of the mold/welding head, one of which is much smaller than the longitudinal dimension of the mould, ie 12) 21, (or l), but the other transverse dimension of the mould is larger, close to or beyond the longitudinal dimension of the mould At this time, the radiating surface of the sound wave is a long and narrow rectangular surface, and the lateral vibration corresponding to the direction of the smaller dimension is negligible, but the transverse resonant frequency corresponding to the larger size direction is closer to the longitudinal resonant frequency, and both will be interaction. Therefore, the lateral vibration in this direction has a large influence on the longitudinal direction. At this time, the one-dimensional theory is no longer applicable, and the system must be analyzed, studied, and designed using the theory of coupled vibration, and this lateral vibration should be suppressed.

 

3. The two transverse dimensions of the ultrasonic mold/welding head are comparable to their longitudinal dimensions. At this time, the acoustic radiation surface of the tool is a large-sized short surface with a small length and width, and the longitudinal resonant frequency of the tool and its two The lateral resonance frequency is relatively close. In this case, due to the Poisson effect, the tool also generates strong vibrations in both lateral directions while longitudinally resonating. The mutual coordination of the longitudinal vibration and the transverse vibration changes the longitudinal vibration state of the tool. At this time, if the one-dimensional theory is still used to calculate and design the tool, the theory and the experiment will have a large error. Therefore, the above must be utilized. The theory of fine vibration studies the three-dimensional coincidence vibration of the tool. In order to ensure the working efficiency of the tool and the uniformity of the displacement distribution on the radiating surface, it is necessary to effectively suppress the lateral vibration of the two directions.


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