The laser wavelength of the carbon dioxide laser marking machine is 10.6 μm, and the laser working substance is a CO 2 mixed gas. The laser conversion efficiency is high, and the generated heat can be quickly transmitted to the outside of the laser gain region by convection or diffusion, and the average output power of the laser output can be achieved at a high level (over 10,000 watts) to meet the requirements of high-power laser processing.
Carbon dioxide lasers can be divided into several types: low power, medium power, and high power carbon dioxide lasers.
(1) Low-power (<200W) CO2 laser applications are mainly used in the electronics industry (such as resistor manufacturing, IC marking), non-metallic processing industry (bamboo wood carving, apparel, footwear, jewelry manufacturing, etc.) and some medical and research units. use.
(2) Application of medium and high power (200~ 1600W) CO2 lasers Mould industry, cutting of various machine parts, automotive sheet metal cutting, sheet metal cutting of computer and electrical casing, special material cutting such as: plastic, glass, mold, etc. Non-metallic cutting.
(3) Application of high-power (>1600W) CO2 laser High-power CO2 laser with more than 1600W is mainly used in metal cutting, welding and surface treatment. It has been gradually adopted by the defense, automobile and aerospace industries in industrial advanced countries. Used in the field.
Traditional high-power shaft fast-flow carbon dioxide lasers are still the mainstream configuration in high-power laser cutting equipment. Although fiber lasers have developed rapidly in recent years, carbon dioxide lasers still account for as much as 65% of the total.
High-power carbon dioxide lasers for laser processing at home and abroad are mainly cross-flow and axial-flow lasers. The beam quality of cross-flow lasers is not very good, it is multi-mode output, mainly used for heat treatment and welding. At present, China has been able to produce a variety of high-power cross-flow CO2 laser series, which can meet the needs of domestic laser heat treatment and welding.
Axial flow laser: The axial beam laser has good beam quality and is the basic mode or quasi-base mode output. It is mainly used for laser cutting and welding. The laser cutting equipment market in China is mainly occupied by foreign axial current lasers. Although domestic laser manufacturers have done a lot of work on foreign axial current lasers, because the main parts still need to be imported, the price of the products is difficult to drop drastically and the penetration rate is low.
Swirl CO2 laser: With the new rotary gas flow mode, the cyclonic carbon dioxide laser has the advantages of good axial beam carbon dioxide laser beam quality and low cross-flow CO2 laser cost and small volume. The promotion and application of this kind of industrial processing laser will play a positive role in promoting the development and popularization of China's laser processing industry.
In the late 1960s, China began research on high-power carbon dioxide lasers and their applications. After more than 30 years of hard work, the production capacity of 500 ~ 10kW series products has been formed. About 10 companies and units can produce more than 500W CO2 lasers, including Chutian, Huagong, Dazu, Nanjing Oriental, Nanjing. Trumpf and Shanghai Prima. However, on the whole, Chinese lasers still have a certain distance compared with foreign countries. Most of the Chinese market uses imported products. International brands include Rofin, Trumpf, PRC, Coherent, Access, Prima, Swiss Super, Japan's Mitsubishi, Japan's Mazak and Japan's Amada.
In general, China's CO2 laser technology has undergone years of cultivation and has developed to a certain extent. All of the high-power carbon dioxide lasers on most cutting machines in China still rely on imports. Compared with foreign countries, domestic high-power carbon dioxide lasers have a certain gap in terms of their laser quality and their measurement and control systems.
The superiority of fiber laser marking machine laser is mainly reflected in: fiber laser is a waveguide structure with high gain, high conversion efficiency, low threshold, good output beam quality, narrow line width, simple structure and high reliability. It is easy to implement and The coupling of the fiber, the output peak power can be up to several hundred kilowatts, the wavelength is around 1. 06mm, the absorption efficiency is high for most materials, the volume is small, the weight is light, and it is easy to move. The spot diameter is small (10~100mm), which can be realized. Very precise cutting, which eliminates some post-processing steps. Through the output of the optical fiber, it is easy to cooperate with the robot to realize laser long-distance processing, and the overall photoelectric conversion efficiency is as high as 25% to 30%, which can work stably for a long time, is convenient to maintain, and has low running cost.