15Khz ultrasonic welding horn aluminum alloy for plastic welding
Ultrasonic horn is an important component of ultrasonic equipment, and its function is to transmit ultrasonic vibration energy to the target. The shape of the ultrasonic tool head is generally a cylinder, a cone or a cuboid, and its working surface is basically the end surface of the top. Considering the actual installation and use, the working surface of this type of tool head is generally small, so the radiation ability is relatively large. It is more concentrated and can be better applied in the traditional application directions of ultrasonic waves such as ultrasonic welding and cutting. However, with the continuous advancement of science and technology, ultrasonic waves are no longer limited to traditional applications, and their applications in liquids and gases have become more and more extensive, such as in emulsification, separation, homogenization, extraction, defoaming, cleaning, and liquid atomization. and applications in accelerating chemical reactions. In these applications, the traditional ultrasonic tool head has the following two deficiencies. The existing ultrasonic tool head adopts the vibration mode of longitudinal vibration. The working surface of this type of tool head is perpendicular to the vibration direction. Large, there is almost no radiation on the side, which greatly limits the radiation area of the ultrasonic tool head. However, for the application of ultrasound in liquid or gas, the larger the radiation surface, the better. The larger the radiation surface, the more liquid is affected by the ultrasound, and the effect is more obvious. Secondly, due to the single radiating surface of the existing ultrasonic tool head, it has strong directivity when radiating sound energy. When working in a container, the sound intensity in the container is often uneven, that is, the sound intensity facing the radiating surface of the tool head is strong. The sound intensity facing away from the radiating surface of the tool head is very weak. Generally, in the application of ultrasonic waves in gas or liquid, it is often desirable that the sound intensity is as uniform as possible. Although some ultrasonic tool heads with multi-radiating surfaces have been designed through design improvements, their essence is still longitudinal vibration and sound intensity uniformity. Still not ideal. From the principle of ultrasound, high-power ultrasonic equipment mainly realizes energy transmission through longitudinal vibration. Although longitudinal vibration has a good energy-gathering effect, the radiation surface is single, which often cannot meet the requirements for ultrasonic radiation of liquids or gases. If the radiation surface of the longitudinal vibration is enlarged, the vibration efficiency will be reduced. Generally, the diameter of the radiation surface of the longitudinal vibration is not larger than 1/2 of the wavelength of the longitudinal wave at this frequency.
Different horns are required for different welding objects. Whether it is near-field welding or transmission welding, only half-wavelength tool heads can make the welding end face reach a large amplitude. There are two types of horns with amplitude amplification and without amplitude amplification. The acoustic system horn for plastic welding machines is usually made of aluminum alloy, and its end surface is plated with hard alloy. It is also made of titanium alloy material when the power is large. As a result, the fatigue strength of this material is more than twice that of aluminum alloy.
The design and production of ultrasonic molds must be very simple. Don't be misled, when using an improperly processed or untuned welding horn, it will bring expensive losses to your production-it will destroy the welding effect, and even more seriously, it will directly cause the transducer or damage to the device. Therefore, the design of the ultrasonic mold is by no means as simple as its shape, on the contrary requires a lot of professional knowledge and skills - how to ensure that the welding head can work economically? How to ensure that the welding horn can effectively transfer the mechanical vibration energy converted by the transducer to the workpiece to form a continuous and stable welding.
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