The working principle of ultrasonic welding machine

The principle of ultrasonic plastic welding is to generate a high-voltage and high-frequency signal of 20kHz (or 15kHz) by the generator, and convert the signal into high-frequency mechanical vibration through the transducer system, which is added to the workpiece of plastic products, and the temperature transmitted to the interface rises through the friction between the surface of the workpiece and between the molecules, when the temperature reaches the melting point of the workpiece itself, the workpiece interface melts rapidly, and then fills the gap between the interfaces, when the vibration stops, the workpiece is cooled and shaped under a certain pressure at the same time, and the perfect welding is achieved.

Fusion welding method. 1. Welding method.

Take ultrasound. The welding strength is comparable to that of the body, and the suitable workpiece and reasonable interface design can achieve watertight and airtight, and avoid the inconvenience caused by the use of auxiliary products, so as to achieve efficient and clean welding.

2. Riveting welding method.

The ultrasonic ultra-high frequency vibrating sonotrode is pressed against the protruding tip of the plastic product, causing it to heat up instantly.

It is fused into the shape of rivets to mechanically rivet materials of different materials.

3. Planting. With the propagation of the sonotrode and the appropriate pressure, the metal parts (such as nuts, screws, etc.) are instantly squeezed into the reserved plastic holes and fixed at a certain depth, and the strength of the traditional mold can be comparable to the strength of the traditional mold after completion, which can avoid the shortcomings of the injection mold damage and slow injection.

Ultrasonic welding machines are mainly used for thermoplastics.

Compared with other traditional processes (such as gluing, electric ironing or screw fastening, etc.), the secondary connection has significant advantages such as high production efficiency, welding, environmental protection and energy saving.

Ultrasonic plastic welding equipment is widely used in medical equipment, packaging, auto parts, fishing gear and other industries, such as disposable infusion filters and plasma separation cups, ziplock bags, plastic wine bottle caps, dishwashers.

Welding of water wheels, plastic toys, car lights, plastic fake baits, charger housings and mobile phone slings.

It is well known that when ultrasonic waves act on the contact surface of a thermoplastic plastic, they produce high-frequency vibrations tens of thousands of times per second.

This high-frequency vibration that reaches a certain amplitude transmits ultrasonic energy to the welding zone through the upper weldment, and because the sound resistance at the interface between the two welds is large in the welding zone, it will produce local high temperatures. Due to the poor thermal conductivity of plastics, they can not be dissipated in time for a while, and they gather in the welding area, causing the contact surface of the two plastics to melt rapidly, and after adding a certain pressure, they are fused into one. When the ultrasonic wave stops working, let the pressure continue for a few seconds to solidify and form, so that a strong molecular chain is formed, 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 transducer sonotrod, the pressure applied and the welding time, the welding time and the pressure of the sonotrode can be adjusted, and the amplitude is determined by the transducer and the amplitude.

There is a suitable value for the interaction of these three quantities, and when the energy exceeds the appropriate value, the melting amount of the plastic is large, and the weld is easy to deform; If the energy is small, it is not easy to weld, and the pressure applied should not be too large. This pressure is the product of the side length of the welded part and the optimal pressure per 1mm of the edge.

The above is the ultrasonic welding machine.

I hope it can help you.

The working principle of the ultrasonic welding machine is to convert the mains power into a high-frequency and high-voltage signal through the power supply box, and then convert the signal into high-frequency mechanical vibration through the transducer, and add it to the plastic products, so that the plastic products produce high-speed friction, and the welding can be completed after the pressure reaches the melting point.

Ultrasonic welding machine can be divided into automatic welding machine, semi-automatic ultrasonic welding machine, manual welding machine according to the level of automation, for modern enterprises, the higher the level of automation, the more conducive to the production of enterprise assembly line, so the use of automatic welding machine is a trend in the future of enterprises.

The principle of ultrasonic welding is to use high-frequency vibration waves to transmit to the surfaces of two objects to be welded, and under pressure, the surfaces of the two objects rub against each other to form a fusion between molecular layers.

Ultrasonic welding is the conversion of 50 to 60 Hz current into or 40kHz of electrical energy through an ultrasonic generator. The converted high-frequency electrical energy is again converted into mechanical motion of the same frequency by means of a transducer, which is then transmitted to the sonotrode via a set of amplitude-changing rod devices that can change the amplitude. The sonotrode transfers the received vibration energy to the joint of the workpiece to be welded, where the vibration energy is converted into heat by friction to melt the plastic.

Ultrasound can be used not only to weld hard thermoplastics, but also to process fabrics and films.

The main components of an ultrasonic welding system include ultrasonic generator, transducer, luffing rod, sonotroduct, tool, tool, and frame.