The principle and working principle of ultrasonic welding machine, ultrasonic metal welding machine, lithium battery welding technology
Ultrasonic metal welding machine: also known as ultrasonic metal welding machine, ultrasonic welding machine for car battery tabs, copper-aluminum-nickel-silver welding machine, metal welding uses high-frequency vibration waves to transmit to two metal surfaces that need to be welded.
Under pressure, the metal surfaces are rubbed against each other to form the fusion between the molecular layers. Its advantages are rapid, energy saving, high fusion strength, good electrical conductivity, good thermal conductivity, no sparks, and close to cold state.
Ultrasonic metal welding machine: used for battery positive and negative ear welding, terminal to wire harness welding, terminal to terminal welding. The positive and negative electrodes of the capacitor are welded. Sheet-to-sheet welding, sheet-to-sheet welding, sheet-to-line welding, line-to-line welding, pull-to-line welding, riveting welding. The welding materials are copper, aluminum, and nickel sheets. Ultrasonic metal welding machine: machine The machine is composed of a chassis, a guide post, a transducer, a pneumatic system, a PC circuit, and a bottom mold. (Acoustic component consists of two parts: transducer and welding head. The main variables of ultrasonic metal welding machine are welding power, welding time, and contact pressure. When all three are suitable, the welding joint has the highest strength and resistance to cracking. High strength and shear strength.
During welding, the transducer converts the 20KHZ high-power vibration signal into the corresponding mechanical energy, which is applied to the contact interface of the metal part to be welded. The joint of the weldment is violently friction and instantly generates high heat, so that the molecules alternately fuse. So as to achieve the welding effect.
1. Welding power depends on the thickness δ of the weldment and the hardness H of the material. Generally speaking, the power increases with the increase of the thickness and hardness of the weldment.
2. Vibration frequency, which includes the value of the resonant frequency and the accuracy of the resonant frequency. The choice of frequency is mainly based on the thickness and physical properties of the weldment, and is generally controlled at 15 to 75 kHz. In general, the thinner the weldment, the higher the frequency. The amplitude is determined by the thickness and material of the weldment. Its size ranges from 5 to 25 μm. As the thickness and hardness of the weldment increase, the amplitude increases accordingly.
3. The static pressure depends on the thickness, hardness, joint form, and ultrasonic power of the material. It is directly used to transmit ultrasonic vibration energy to the weldment.
4. The welding time is determined by the thickness of the weldment and the nature of the material. The welding point of ultrasonic welding has a minimum welding time, which is not enough to destroy the oxide film on the metal surface and cannot be welded; usually with the welding time When the welding time increases, the joint strength increases to a stable value; however, when the welding time is too long, the strength of the solder joint decreases, because the weldment is heated more and the plastic zone expands, causing the surface and internal structure of the solder joint to coarsen and reduce the street strength.
