Technical requirements of ultrasonic metal welding machine and its working principle
Introduction of Ultrasonic Metal Welding Machine
Ultrasonic metal welding machine uses high-frequency mechanical vibration to weld non-ferromagnetic metal materials. During the welding process, one of the workpieces is fixed, and the other workpiece is cyclically vibrated on its surface at a frequency of 20/40kHz, and pressure is applied to the workpieces to form a firm bond between the workpieces, thereby achieving the welding effect . The entire welding process can be precisely controlled without generating excess heat on the metal surface, and the welding fastness is strong.
Technical requirements of ultrasonic metal welding machine
1. High-power capacity and stable ultrasonic generator: The first requirement for a stable ultrasonic generator is: automatic frequency tracking. Frequency automatic tracking can ensure that the transducer system can work in resonance, that is, the maximum amplitude of the welding head. Ultrasonic metal welding machine adopts automatic frequency tracking technology, and there is no need to adjust the frequency when changing molds and working, which is the basic requirement for metal welding. The equipment with adjustable inductance and manual frequency adjustment basically cannot meet the requirements. A stable ultrasonic generator also requires: constant amplitude function and stepless adjustment of amplitude. Constant amplitude function, which can ensure the consistency of welding, is the key to stable production; the stepless adjustment of amplitude is the basic to ensure the use of equipment, such as welding copper and aluminum materials through parameter adjustment on the same equipment. High power capacity: Compared with plastic welding, metal welding requires a higher energy density and must have a relatively high power capacity. For example, a 20kHz machine basically requires a power capacity of more than 3000W. Many companies often have false ratings for power capacity, so we only need to compare them with the plastic welding machines they make, because no one believes that the plastic welding machine is too high.
2. High-quality welding head: As an industrial application, metal welding inevitably requires a long-life welding head.
3. High-quality transducer: For example, a 20kHz transducer must be able to withstand a load above 3kw for a long time. The transducers of many companies, which are welded with ordinary plastic, are difficult to distinguish in appearance, which is irresponsible.
4. High-quality control system: It has three basic control modes of welding energy, time and height, and a variety of quality control software to meet different needs.
Working principle of ultrasonic metal welding machine
1. The transducer converts the ultrasonic frequency high-power oscillating signal into mechanical energy of the corresponding frequency, and applies it to the interface of the metal sheet to be welded, so that the metal sheet meets instantaneous heat, and then activates the particles in the metal lattice. The molecules where the metal sheets meet each other penetrate and weld together.
2. Ultrasonic metal welding machine is a mechanical treatment process, which converts high-frequency electric energy into mechanical vibration through the transducer device to act on the workpiece, so that the surfaces of the contacting workpieces produce high-frequency friction to cause heat to condense and fuse. During the process, there is no current passing through the welded parts, and there is no welding arc in the electric welding mode. Since ultrasonic welding does not have problems such as heat conduction and resistivity, it is undoubtedly an ideal metal welding for non-ferrous materials. The system, especially the single-point, multi-point, square, strip, single-layer, multi-layer, and composite welding of thin and thin materials such as aluminum, nickel, copper, and silver can achieve ideal results.
