Knowledge explanation of ultrasonic plastic welding machine
Ultrasonic plastic welding machine is a machine that uses ultrasonic welding. Usually used for plastic welding. It completely replaces the traditional bonding industry. There are no bolts, nails, snap rings, welding materials or adhesives in the ultrasonic welding process. It is faster than traditional adhesives or glues and has a faster drying time. The welding process is easy to implement. Automatic and easy to customize. Ultrasonic plastic welding machine has many welding methods, such as welding method, riveting method, spot welding method and so on.
When ultrasonic waves act on the thermoplastic interface, tens of thousands of high-frequency vibrations are generated every second. This high-frequency vibration reaches a certain amplitude. Ultrasonic energy is transmitted to the welding area through the upper weldment. Due to the high acoustic resistance of the welding area (that is, the interface between the two welds), local high temperature will be generated. Due to the poor thermal conductivity of plastics, they cannot be distributed and gathered in the welding area in time, causing the contact surfaces of the two plastics to melt rapidly, and a certain pressure is added to make them merge into one. When the ultrasonic stops working, let the pressure continue for a few seconds to make it solidify and form a solid molecular chain, so as to achieve the purpose of welding, and the welding strength can be close to the strength of the raw material. The quality of ultrasonic plastic welding depends on the amplitude of the welding joint of the transducer, the applied pressure and the welding time. The welding time and welding pressure are adjustable, and the amplitude is determined by the sensor and the horn. The interaction of these three quantities has an appropriate value. When the energy exceeds a certain value, the amount of plastic melting is large, and the welding material is easily deformed. If the energy is small, it is not easy to weld firmly, and the pressure applied cannot be too large. This pressure is the product of the length of the edge of the weldment and the pressure per mm of the edge.
Ultrasonic welding machines are usually used for plastic welding. It completely replaces the traditional bonding industry. There are no bolts, nails, snaps, welding materials or adhesives in the ultrasonic welding process. It is faster than traditional adhesives or glues, and the drying time is also fast. The welding process can be completed. It is easy to realize automation and easy to customize to adapt to various specific specifications of welding products.
Knowledge explanation of ultrasonic plastic welding machine
As a welding equipment, the ultrasonic plastic welding machine is widely used in the manufacturing industry. Many precision plastic products use this welding equipment. Ultrasonic plastic welding machine not only has beautiful appearance of welded products without welding traces, but also has very high welding efficiency, which can meet the production needs of factories. The advantages of these ultrasonic plastic welding machines are inseparable from the ultrasonic technology and the structural design of the welding machine.
The welding process of the ultrasonic plastic welding machine is very short, but the process is very complicated. In a few seconds or less, the equipment completes the propagation of ultrasonic vibration in the acoustic system and welding parts, and the ultrasonic waves cause the welding area to generate heat. , The workpiece is fused by heat conduction, and then the workpiece is cooled in the welding zone in a short time. The heat generation process from ultrasonic energy to thermal energy is the main step to realize the welding of ultrasonic plastic welding machine, and it is also an important factor that affects the quality of welding. A large number of experimental studies and theoretical analyses have been conducted on the heat generation mechanism of the welding process of ultrasonic plastic welding machines at home and abroad. With the deepening of research, people have gradually discovered that this process does not rely on a single heating mechanism to achieve the transformation of vibrational mechanical energy to thermal energy. Conversion. Studies have found that the frictional heat and viscoelastic thermal recombination of plastic workpieces will also affect the welding effect of the ultrasonic plastic welding machine.
There are many domestic manufacturers of ultrasonic plastic welding machines. Although their welding equipment is not as good as foreign welding equipment, the overall manufacturing level has been greatly improved. Domestic ultrasonic plastic welding machines can basically meet the processing needs of most domestic factories. These equipments are very good in terms of welding quality and welding efficiency. Moreover, compared with imported ultrasonic plastic welding machines, domestic welding equipment is cheaper and more suitable for domestic small and medium-sized processing plants.
