The process of Plastic Welding Machine is mainly for the high-frequency mechanical vibration between the interfaces of the workpieces to be welded under the action of welding pressure, thereby generating shearing force, and generating heat during the friction process, causing plastic deformation, so that the workpieces reach solid-phase connection. state. The principle of ultrasonic metal welding is shown in Figure 1. The ultrasonic generator converts the 50Hz power frequency current into a 16-80 kHz resonant current, transfers the resonant current to the ultrasonic transducer through the inverse piezoelectric effect, converts it into elastic mechanical energy, and then amplifies the amplitude through the horn. The elastic vibration energy is transmitted to the workpiece from the upper sonotrode. The acoustic system is the whole composed of the transducer, the horn, the upper sonotrode and the clamping mechanism. When the system is working, the frequency of the oscillating current in the generator is consistent with the natural frequency of the acoustic system, and the whole system is in a resonance state. While applying pressure to the workpiece, it also transmits elastic vibration energy, which is finally converted into friction work, deformation energy and heat energy between the upper and lower workpieces, which can make it reach the welding state in a short time.
As another emerging ultrasonic welding method-Automatic plastic welding machine after ultrasonic plastic welding, it has the incomparable advantages of other welding methods in the welding of the same and dissimilar metals. Ultrasonic metal welding does not require flux and external heating source, does not deform due to heating, has no residual stress, and does not require high pre-welding treatment on the surface of the weldment. It can not only weld similar metals, but also meet higher welding requirements for dissimilar metals, and can weld thin sheets or filaments on thick plates. Ultrasonic welding of good conductors consumes much less energy than current welding. As a low-power application of ultrasonic metal welding, ultrasonic bonding is often used in the welding of transistor or integrated circuit leads. When used for sealing welding of drugs and explosive materials, it can avoid the contamination of drugs caused by dissolved substances in general welding methods, and will not cause explosions due to heat or sparks. Ultrasonic metal welding has many advantages such as fast speed, energy saving, high bonding strength, good electrical conductivity, no spark, solid state processing and so on.