The laser cutting machine focuses the laser emitted from the laser into a laser beam with high power density through the optical path system. The laser beam irradiates the surface of the workpiece to make the workpiece reach the melting point or boiling point. At the same time, the high-pressure gas coaxial with the beam blows away the molten or gasified metal. With the movement of the relative position between the beam and the workpiece, the material will finally form a slit, so as to achieve the purpose of cutting.
The laser cutting machine has no contact with the workpiece and will not scratch the workpiece surface during operation; The laser cutting speed is fast, the incision is smooth and flat, and there is generally no need for subsequent processing; Small cutting heat affected zone, small plate deformation and narrow cutting seam (0.1mm ~ 0.3mm); The notch has no mechanical stress and no shear burr; High machining precision, good repeatability and no damage to the material surface; NC programming, can process any plan, can cut the whole board with large format, no need to open the mold, economical and time-saving.
Laser cutting machine is widely used in our daily life, so what are the types and advantages of laser cutting machine?
Analysis of types and advantages of laser cutting machine
Laser cutting is realized by using the high power density energy generated by laser focusing. At present, there are three common laser cutting machines in the market: fiber laser cutting machine, CO2 laser cutting machine and YAG laser cutting machine.
1.Fiber laser cutting machine
Fiber laser cutting machine is a laser cutting machine using fiber laser generator as light source.
Fiber laser is a new type of fiber laser developed in the world. The laser beam with high energy density is output and gathered on the surface of the workpiece, so that the area irradiated by the ultra-fine focus spot on the workpiece can be melted and gasified instantly, and the automatic cutting can be realized by moving the spot irradiation position through the numerical control mechanical system. Compared with the huge gas laser and solid-state laser, it has obvious advantages and has gradually developed into an important candidate in the fields of high-precision laser processing, lidar system, space technology, laser medicine and so on.
2.CO2 laser cutting machine
CO2 laser cutting machine can stably cut carbon steel within 20mm, stainless steel within 10mm and aluminum alloy below 8mm. The wavelength of CO2 laser is 10.6um, which is relatively easy to be absorbed by non-metallic materials. It can cut wood, acrylic, PP, plexiglass and other non-metallic materials with high quality, but the photoelectric conversion rate of CO2 laser is only about 10%.
The CO2 laser cutting machine is equipped with a nozzle for injecting oxygen, compressed air or inert gas N2 at the beam outlet to improve the cutting speed and the smoothness of the incision. In order to improve the stability and service life of power supply, the discharge stability of high-power laser should be solved for CO2 gas laser. According to the international safety code, the laser hazard level is divided into four levels, and CO2 laser belongs to the lowest level. However, the use cost of CO2 laser cutting machine is the highest among the three laser cutting machines.
3.YAG laser cutting machine
YAG solid laser cutting machine has the characteristics of low price and good stability, but its energy efficiency is generally low.
The wavelength of YAG solid-state laser cutting machine is not easy to be absorbed by non-metallic materials, so it can not cut non-metallic materials. What YAG solid-state laser cutting machine needs to solve is to improve the stability and service life of power supply, that is, to develop an optical pump excitation light source with large capacity and long service life. If a semiconductor optical pump is used, the energy efficiency can be greatly increased.
