Both the welding head and the ultrasonic horn are desig […]
Both the welding head and the ultrasonic horn are designed as a half-wavelength resonator of the working frequency. In the working state, the amplitude of the two end faces is relatively large and the stress is relatively small, and the amplitude of the node at the middle position is zero, and the stress is relatively Big. The node position is generally designed as a fixed position, but the thickness of the usual fixed position is greater than 3mm, or the groove is fixed, so the fixed position is not necessarily zero amplitude, which will cause some calls and a part of energy loss. Calls are usually isolated from other parts by rubber rings, or shielded by a vibration reduction structure design. The energy loss should be fully considered when designing the amplitude parameters. The rubber ring is called soft fixation, and the vibration reduction structure design is generally called hard fixation. In ultrasonic metal welding, a hard fixed structure is usually used, and the hard fixed structure also has an end surface fixed mode.
Ultrasonic welding machines can be divided into automatic welding machines, semi-automatic ultrasonic welding machines, and manual welding machines according to the level of automation. For modern enterprises, the higher the level of automation, the more conducive to the production of enterprise assembly lines, so the use of automatic welding machines is a future for enterprises trend. When an object vibrates, it makes a sound. Scientists call the number of vibrations per second the frequency of sound, and its unit is hertz. The frequency of sound waves that our human ears can hear is 20HZ～20000Hz. Therefore, when the vibration of the object exceeds a certain frequency, that is, higher than the upper limit of human hearing threshold, people will not be able to hear it. Such sound waves are called "ultrasound." The ultrasonic frequency usually used for medical diagnosis is 1 to 5 MHz.