The principle of ultrasonic welding machine, ultrasonic welding method

The principle of ultrasonic 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 is quickly melted, and then the gap between the interfaces is filled, when the vibration stops, the workpiece is cooled and shaped under a certain pressure at the same time, and high-quality welding is achieved.

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.

The common ultrasonic welding methods can be divided into four types: ultrasonic welding, ultrasonic riveting, ultrasonic spot welding and ultrasonic implantation according to the connection method.

On the welding equipment, by adjusting the pressure, amplitude and other parameters, to ensure that the sonotrode contacts the welding surface and applies pressure, the sonotrode produces ultrasonic high-frequency, the upper workpiece vibrates to generate heat, and the lower workpiece is the part that accepts the pressure, which is placed in the bottom die and does not move, and the three are combined to complete the fusion of the workpiece, and then the sonotrode stops vibrating, maintains the pressure, and cools the melting position to achieve the purpose of perfect welding.

The working principle is similar to welding, the method is to penetrate a plastic rivet into another material, the welding surface of the welding head is designed to be rivet-coated, and the plastic rivet is welded and coated on another material by high-frequency vibration heat generation.

The working principle is similar to welding, in which the sonotrode is designed in the shape of a pistol, with one end of one plastic workpiece penetrated and fused to the plane of another plastic workpiece. The advantage is that the welded surface does not require any special design, tongue tenon and rivet, and is often used for large flat workpieces.

The working principle is similar to welding, the method is to place the embedded metal nail in the plastic workpiece, and then the welding head touches the metal nail and vibrates to generate heat, so that the nail is embedded and fixed in the plastic workpiece.

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.

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 welding head is pressed against the protruding tip of the plastic product, so that it instantly heats up and melts into the shape of a rivet, so that the materials of different materials are mechanically riveted together.

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.

The ultrasonic welding machine is mainly used for the secondary connection of thermoplastics, and compared with other traditional processes (such as gluing, ironing or screw fastening, etc.), it 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, dishwasher water wheels, plastic toys, car lights, plastic fake fishing bait, charger shells and mobile phone slings.

Answer the principle of ultrasonic welding: when ultrasonic waves act on the contact surface of thermoplastic plastics, tens of thousands of high-frequency vibrations per second will be generated, and this high-frequency vibration of a certain amplitude will be transmitted to the welding area through the upper weldment. 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. rod decides.

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 optimal pressure is the product of the side length of the welded part and the optimal pressure per 1mm of the edge.

Ultrasonic Metal Welding Principle:

The principle of ultrasonic metal welding is a special method of connecting the same metal or dissimilar metals by using the mechanical vibration energy of ultrasonic frequency (more than 16kHz) When the metal is welded by ultrasonic, it neither transmits current to the workpiece, nor applies a high-temperature heat source to the workpiece, but only under static pressure, the vibration energy of the frame is converted into friction work, deformation energy and limited temperature rise between the workpieces The metallurgical bond between the joints is a kind of solid-state welding realized without melting the base metal Therefore, it effectively overcomes the phenomena of spatter and oxidation generated during resistance welding Ultrasonic metal welding machine can carry out single-point welding, multi-point welding and short strip welding of non-ferrous metal filaments or sheet materials such as copper, silver, aluminum, nickel and other non-ferrous metals It can be widely used in the welding of thyristor leads, fuse pieces, electrical leads, lithium battery pole pieces and tabs.

The principle of ultrasonic metal welding is a special method that uses the mechanical vibration energy of ultrasonic frequency (more than 16kHz) to connect the same metal or dissimilar metal When the metal is carried out ultrasonic welding, it neither transmits current to the workpiece, nor applies a high-temperature heat source to the workpiece, but only converts the vibration energy of the frame into friction work, deformation energy and limited temperature rise between the workpieces under static pressure. The metallurgical bonding between joints is a kind of solid-state welding achieved without melting the base metal, so it effectively overcomes the spatter and oxidation phenomena generated by resistance welding. Ultrasonic metal welding machine can perform single-point welding, multi-point welding and short strip welding of non-ferrous metal filaments or sheet materials such as copper, silver, aluminum, nickel, etc.

It can be widely used in the welding of thyristor leads, fuse pieces, electrical leads, lithium battery pole pieces and tabs.

20,000 vibrations per second are applied to the workpiece.