I. Introduction As shown in Fig. 2, martensite, carbides, retained austenite, etc. are formed in the transformation hardening zone, and are obtained in the transformation hardening zone due to the rapid temperature increase and the cooling rate of the processing of 10-5 seconds. All kinds of components are extremely small and produce a large number of misalignments, which are very beneficial to improve the hardness and wear resistance of the roller surface, so that the roller surface after laser transformation has more excellent wear resistance than conventional quenching. At the same time, preheating was performed for the next step of laser texturing. As shown in FIG. 3, when the front teeth and the rear teeth of the optical disc 2 are moved to the position shown in the figure, the laser beam 3 directly focuses the incident point on the roller surface Q′ of the roller 1 through the through holes between the front and rear teeth, and the incident area thereof is as follows. For 0.02mm2, the power density is above 107W/cm2, so that the metal material on the roller surface quickly dissolves into a dissolution pool. The dissolved material in the solution pool is accumulated in the direction of the side of the solution pool under the effect of side blowing gas 5 and centrifugal force and passes through the speed. Condensation forms ordered high-intensity pits and bosses to complete texturing. Side blowing gas 5 for a given direction, flow rate, and pressure has three functions in addition to the styling task: 1. It prevents the surface of the roll from interacting with the oxygen in the air during the hot working process, resulting in decarbonization that affects the strength of the boss. 2. To avoid damage to the lens caused by spatter produced in the process of solidification and hardening. 3. To avoid the effect of excessive plasma generated in the laser melting process to form a shield on the laser incidence. 2) CO2 laser texturing process Laser texturing roller surface According to the requirements of cold rolling plate rolling process and follow-up processing requirements: such as selected plate surface roughness values, such as general plate, home appliance plate, automobile plate, security plate, annealing, deep drawing, ultra deep drawing, galvanizing, color coating, etc. Process indicators for density and flatness values, as well as technical indicators for roughness copy rate and attenuation rate (in the actual production, these two indicators are very important to users), and the main process parameters that determine the process parameters are laser power, Laser pulse frequency, scanning speed, spot diameter, focusing distance. The greater the power used, the greater the roughness value (Ra), the power value can be continuously and automatically regulated; the pulse frequency is determined by the speed of the disc and the number of teeth of the disc, generally about 20KHZ, ie, 20,000 points per second Morphology; that is, the higher the pulse frequency, the higher the density value (peak number PC). The scanning speed is determined by the rotational speed of the roller, the diameter of the roller surface and the moving speed of the texturing device, and is generally 6.5 m/sec. Ra and PC values ​​can be increased by lowering the scanning speed; the spot diameter and focal length are determined by the external light path. These variables can be accurately performed by the 840D CNC system, inspection system and dedicated process software. The operator is only responsible for lifting, inputting the selected roughness value, density value, and flatness value, which is very convenient. Because all the process parameters can be precisely controlled, CO2 laser texturing can reproduce the required processing and results, which is very beneficial for summarizing the effect of texturing and developing new products (the first generation of shot peening, the second generation of electricity Sparks have defects that do not significantly harden and reproduce the function. 1. Roller 2. Electrolyte As shown in FIG. 5 , the textured part of the roll 1 and the electrode 3 are both immersed in the electrolyte 2 with a gap distance of about 0.1 mm. The roll is grounded at zero line for low-speed rotation and the rotation speed is usually about 8 rpm. 3 mounted on the hair head 4 for horizontal linear motion. The electrical circuit includes a high voltage loop 5 and a low voltage loop 6 . When electrolyte 2 is punctured, the low current of the high voltage loop provides the initial pulse. The texturing of pits and needle spikes is the result of a low voltage pulse created by the electrode's spark discharge from the metal material on the roll surface. The magnitude of the current is accomplished by selecting one or more resistor combinations whose pulse frequency is set by adjusting the oscillator output. The size of the current and the duration of the sparks determine the size, number, and shape of the pits and peaks on the roll surface (of course, as the roll is texturized, the electrodes are also more quickly texturized and are consumable parts). Because of the limitation of EDM technology itself, it is impossible to form a dome-shaped boss with strong extrusion resistance. Due to the rapid decay of the needle peaks, the surface morphology of the roll surface is poorly maintained, the wear rate is very fast in the initial wear stage, and the wear resistance during the normal wear stage is general. In order to prolong the service life of the rollers, many steel companies adopt the EDM and hard chrome plating process, that is, the chrome plating layer with higher hardness is mechanically combined on the surface of the electric sparks. However, due to the chrome plating, the effect of grain filling on the texturing effect is even more important, and it is more difficult for the chrome plating layer to be locally detached due to the mechanical bonding in the complex rolling process. The texturing head 4 shown in FIG. 5 is composed of a servo shaft and a dozen individual electrodes 3, and an electric discharge texturing machine generally has several texturing heads. EDM woolen roll surface The important parameters that determine the index of the electrospinning process are various electrical parameters, discharge gaps, and electrolytes of the pulsed power supply. The larger the electric current is, the deeper the EDM pit is, the roughness value (Ra) increases, and the corresponding peak number (PC) decreases. The longer the current lasts, the wider the EDM pit and the corresponding peak number (PC), whereas the PC value increases. The smaller the gap, the higher the efficiency, but the gap is too small to take away the waste generated during the EDM process without flowing the insulating oil. Usually the gap is about 0.1mm. The electrolyte consists of insulating oil and additives, where the additives form conductive bridges in the gap. The higher the dielectric constant of the additive, the smaller the gap, the particle size of the additive, and the uniformity of the distribution in the gap flow have a great influence on the electrocreation texturing effect. In addition, the discharge end face of the electrode and the circular arc face of the roller face are also not possible to maintain equal distances between corresponding points on both sides. Beverage Cooler,Wine Cooler,Beer Cooler,Beverage Refrigerator Guangzhou Join Electronic & Technology Co., Ltd , https://www.alef-hesed.com
Because lasers have unique features such as high brightness, high directionality, high monochromaticity, and high coherence, they can bring many features that are not available in other processing methods, such as: no contact processing, no cutting processing, no Tool wear processing, high energy density ultra-speed machining, local thermal deformation, small machining, and flexible machining with the CNC system can easily cooperate. So laser technology is listed in one of the four inventions of 20th century atomic energy, semiconductor, and computer.
For this purpose, the Chinese government established the National Key Laboratory of Laser Technology (the theory of studying the role of lasers and substances) and the National Laser Processing Engineering Center (the application of laser processing) in Wuhan Huazhong University of Science and Technology in the mid-1980s and early 1990s. The traction of these two sources gave birth to the “China Optics Valleyâ€. Under the guidance of the market economy, “China Optics Valley†has created dozens of laser technology fields first and even the world’s first in a few years.
High-power CO2 laser texturing technology and equipment is one of them. It belongs to the international leading technology with independent intellectual property rights. This technology can not only complete the high-quality laser texturing, but also has the special function of laser quenching, which can make the life of the roller. More than doubled, its comprehensive economic benefits can give users the opportunity to recoup their investment within the year and bring long-term, stable, and significant economic benefits.
Second, CO2 laser texturing mechanism
Laser texturing technology and equipment is China's "Eighth Five-Year Plan" national science and technology (tackling) project, which started in 1991 and was put into operation in Wuhan Steel in 1996. It has achieved certain results. Due to the limitations of technical conditions of various units in the late 1980s and early 1990s, the first CO2 laser weaving machine tool developed as a key scientific research topic in the country was unavoidable. Although it is currently suspended, it should be seen. The forward-looking and market prospects in the international wool industry. Currently under the implementation of Huaguang Laser Corporation of Huazhong University of Science and Technology, Kunming Iron and Steel Company, Jinan Iron and Steel Company, Tangshan Jianlong Iron and Steel Company and Chongqing Iron and Steel Company have adopted this technology and equipment and obtained new intellectual property patents.
1) CO2 laser texturing mechanism (with texturing and hardening functions)
As shown in FIG. 1 : during the texturing process, the optical disc 2 rotates counterclockwise, the roller 1 rotates clockwise, the laser beam 3 is irradiated to the rear tooth surface of the front tooth through the focusing mirror 4, and is reflected to the front tooth surface of the rear tooth, and is incident again. To the Q point of the roll surface, the incident area is less than 0.5mm2, and its power density is 104~105W/cm2, so that the phase change of the metal material on the roll surface occurs rapidly (the temperature is below the melting point). 
Third, the electrospinning mechanism
The special equipment for electro-clotting and texturing technology currently has no professional manufacturer in China. Most steel companies only think that the uniformity and maintainability of their appearance are better than those of peening, and due to the psychological induction from the public and from outside, Therefore, most of the foreign EDM equipment has been introduced. It should be said that the electrospark texturing technology was born on the basis of EDM technology in the 40's, which is a few decades behind laser processing technology. We should not take the old path of introduction and introduction, let alone cost-effectiveness.
China began researching and applying EDM technology in the early 1950s, mainly for mold forming and wire cutting. The Chinese government dares to advance the issue of woolen equipment in the metallurgical industry, enters the high-end, puts aside the follow-up development of electric-spark wool equipment, and it is undoubtedly that the state key scientific research projects directly invested in WISCO “large-scale CO2 laser texturing equipment and technology†are Correct guidance.
1) EDM mechanism
EDM is a kind of self-excited discharge, which is characterized by a high voltage between the two electrodes before discharge. When the two electrodes are connected, the electrolyte in the gap is broken down and an instantaneous spark discharge occurs. During the breakdown process, the resistance between the two electrodes rapidly decreases, and the voltage rapidly decreases. 
3. Electrode 4. Texturing head
5. High-voltage piezoelectric fire 6. Low-voltage electric fire
7. Select Current 8. Mechanical Pulse
2) EDM texturing process 
Fourth, the conclusion
In summary, through the comparison of the mechanisms and processes of the two technologies, it is not difficult to see that the EDM technology originates from the EDM technology in the 40s. The process parameters and factors that affect the effect of the texturing are numerous and extremely complex. , very random. Due to the limitations of its technical level, the reproducibility, retention, and wear resistance of its textural appearance all lag behind those of laser technology based on one of the four major inventions of the 20th century. The stability of the process above, and the electric sparks need to use a lot of electrolyte, pollution and energy consumption. In addition, the imported electric spark texturing equipment is 2-5 times more expensive than domestic CO2 laser texturing equipment. Therefore, it is not difficult for us to know that the new high-power CO2 laser texturing equipment will become the third generation of leading products in the metallurgical industry at home and abroad.