Laser cutting machines have been widely used in all walks of life, but few people know the working principle of laser cutting machines. Today, I will popularize the working principle of laser cutting machine to everyone.
Lasers can not only electroluminescence in nature, but also a kind of light produced by the transformation of atoms (molecules or ions kites) in the process of natural radiation. Laser light is a very light form of light, but it is significantly different from ordinary light. The laser initially relies on spontaneous emission for a short time, and the subsequent process is completely determined by the excitation radiation, so its color is very pure, there is almost no dispersion directivity, and the luminous intensity is very high.
Laser also has the characteristics of high coherence, high intensity and high directivity. After the laser is generated, it is transmitted by the mirror and irradiated on the object to be processed through the focusing mirror, the object (surface) is subjected to strong thermal energy, and the temperature rises rapidly.
Laser cutting is achieved by applying high power density energy generated by laser focusing。Under the control of the computer, the laser discharges in a pulsed manner, and generates a controlled and repeated high-frequency pulsed laser with a certain frequency and pulse width. The pulsed laser beam is transmitted and reflected by the optical path, and is focused on the surface of the object to be processed through the focusing lens group to form a small high-energy density light spot. The focus is located near the surface to be processed, and the material to be processed is instantly melted or vaporized at high temperature.
The high-energy laser pulse instantly forms a small hole in the surface of the object. Under the control of the computer, the laser processing head and the object to be processed continuously move relative to each other, and the desired shape is found and processed according to the pre-drawn graphics.
The laser cutting machine focuses the laser on the material, heats the material locally until it exceeds the melting point, and then blows the molten metal away with coaxial high-pressure gas or the generated metal vapor pressure. As the beam moves linearly with the material, the holes are formed continuously. Very narrow slit width.
The energy released when the laser beam hits the surface of the metal sheet melts the metal sheet and the slag is blown away by the gas. The laser source usually uses a fiber laser beam. Through lenses and mirrors, the laser beam is concentrated in a small area, and the high concentration of energy makes the local area rapidly heated, causing the metal sheet to melt.
English 
Chinese