Industry | the fastest knife, the brightest light, the most accurate ruler laser equipment industry in the era of "light" processing
Although compared with foreign countries, China's laser equipment industry started slowly, it has entered a period of rapid growth in the past decade, and the progress of laser equipment localization has been accelerated in an all-round way. At the same time, in view of the challenges faced by the development of the new era, the laser equipment industry is constantly exploring a new direction of development, and a new era is opening.
As a new type of light source, laser has the characteristics of good directivity, high brightness, good monochromaticity and high energy density. It is known as "the fastest knife", "the most accurate ruler" and "the brightest light"“ "Laser technology" is an important basic technology in the field of modern high technology. It is also one of the four major inventions of mankind in the 20th century after nuclear power, computer and semiconductor.
In the past few decades, laser industry based on laser has developed rapidly in the world. Now it has been widely used in industrial production, communication, information processing, medical and health, military, cultural education and scientific research.
In February 2016, the Ministry of science and Technology issued the "national key basic research and development plan", which explicitly included "laser development" in the national key basic research and development plan. Classification of laser processing equipment
As the middle market of laser industry, laser processing equipment can be divided into three categories: Laser marking machine, laser welding machine and laser cutting machine. Laser marking machines include semiconductor Laser marking machine, CO2 Laser marking machine, optical fiber Laser marking machine, ultraviolet Laser marking machine, etc; At present, there are YAG laser automatic welding machine and optical fiber transmission automatic laser welding machine; Laser cutting machine has YAG laser cutting machine and fiber laser cutting machine.
YAG laser machine
YAG laser is a solid-state laser with infrared wavelength of 1.064um. Krypton lamp is used as the energy source (excitation source), Nd: YAG (Nd: YAG) laser. Nd (neodymium) is a rare earth element, YAG represents yttrium aluminum garnet, crystal structure is similar to Ruby) as the medium to produce laser, the excitation source emits a specific wavelength of incident light, promotes the population inversion of the working material, releases the laser through the energy level transition, amplifies the laser energy and forms a usable laser beam after shaping and focusing.
Semiconductor laser machine
Diode pumped Laser marking machine is a Nd: YAG medium pumped by 0.808um semiconductor laser diode (measuring surface or end face), which produces a large number of inversion particles. Under the effect of Q-switch, the giant pulse laser output with wavelength of 1.064um is formed, and the electro-optic conversion efficiency is high. Compared with the lamp pumped YAG Laser marking machine, the semiconductor pumped Laser marking machine has the advantages of better stability, power saving, no need to change the lamp, etc., and the price is relatively high.
Fiber Laser marking machine
It is mainly composed of laser, vibrating lens and marking card. The Laser marking machine produced by fiber laser has good beam quality, its output center is 1064nm, and its service life is about 100000 hours. Compared with other types of Laser marking machine, the service life is longer, and the electro-optic conversion efficiency is more than 28%. Compared with other types of Laser marking machine, the conversion efficiency of 2% - 10% has great advantages, Outstanding performance in energy saving and environmental protection.
CO2 laser is a gas laser with the wavelength of 10.64um in far-infrared band. CO2 gas is charged into the discharge tube as the medium to produce laser. When high voltage is applied on the electrode, glow discharge is generated in the discharge tube, which can make the gas molecules release laser. After the laser energy is amplified, the laser beam for material processing is formed.
Green Laser marking machine
The green Laser marking machine adopts side pump, which is different from the semiconductor end pump Laser marking machine. It has obvious advantages: the wavelength of 532nm green laser output, smaller spot diameter after focusing, more concentrated energy, high electro-optic conversion efficiency and good beam quality. The whole machine has good protection and convenient marking control. PLC program control is adopted to realize one button start-up.
The device is more suitable for surface carving of glass products, such as mobile phone screen, LCD screen, optical devices (such as optical lenses, etc.), automobile glass, etc. At the same time, it can be applied to the surface processing or coating film processing of most metal and non-metal materials, such as hardware, ceramics, glasses, clocks, PCs, electronic devices, various instruments, PCB boards and control panels, nameplates, display boards, plastics, etc. Compared with the similar products, it has quite high cost performance. It's more expensive.
Laser cutting machine
Laser cutting is a process in which the horizontal laser beam emitted by the laser passes through 45 ° The total mirror changes into a vertical downward laser beam, which is focused by the lens and forms a tiny spot at the focus. The laser power density at the spot is as high as 10 ^ 6 ~ 10 ^ 9W / cm ^ 2.
When the workpiece at its focus is irradiated by the laser spot with high power density, 10000 laser beams will be generated ° The local high temperature above C makes the workpiece vaporize instantly, and then with the auxiliary cutting gas to blow away the vaporized metal, so as to cut the workpiece into a very small hole. With the movement of the CNC machine tool, countless small holes are connected to form the shape to be cut.
Because the frequency of laser cutting is very high, so each hole connection is very smooth, cutting out the product finish is very high.
Laser welding machine
Laser welding is the use of high-energy laser pulse to heat the material in a small area. The energy of laser radiation is guided to the internal diffusion of the material through heat transfer, and the material is melted to form a specific molten pool.
It is a new type of welding method, mainly for the welding of thin-walled materials and precision parts. It can realize spot welding, butt welding, overlap welding, seal welding, etc. it has high depth width ratio, small weld width, small heat affected zone, small deformation, fast welding speed, smooth and beautiful weld, no treatment or simple treatment after welding, high weld quality, no porosity, and can be accurately controlled, Small focus spot, high positioning accuracy, easy to realize automation.