Textured cold-rolled steel sheet is formed by the roller rolling surface texturing processing, the steel industry roll hair technology development by three stages: (1) the sixties and seventies of the shot peening Texturing Technology (Shot blasting) (Figure 1.2) shows, the hard sand pill high-speed playing in the roll surface to achieve the roll surface texturing, dense pits punched in the roll surface. However, this texturing process noise, dust and the high power consumption. And the randomness of the hardness of the roll surface area, shot size and impact rate and impact angle, heterogeneity, it is difficult to control and repeatability bad defect, coupled with the high cost of processing, is now in the developed laser texturing technology and EDM texturing techniques replaced. ② the seventies and eighties spark Texturing Technology (Electron,-discharge texturing), the basic principle is to dip roll and graphite electrode on the insulating oil, the roller rotates, the pulse voltage is applied between the graphite electrode and the roll, under certain conditions discharge phenomenon between the electrode and the rolling roll breakdown discharge produced positive negative ions under the electric field to accelerate the role of, respectively, bombarding the surface of the roll and the electrode surface, pulse bombarding energy so that the roll of local temperature over its melting point, causing the roll surface partial melting or gasification . Pulse gap, no discharge phenomenon occurred, the original pulse discharge generated during the metal droplets in insulating oil spilled from the crater to the process of condensation, resulting in the roll surface to form a series of pits. The majority of steel prices is just that the morphology, uniformity, and to maintain than the shot peening texturing. However, such process exists roll life is short, high equipment maintenance, power consumption, maintenance inconvenience and serious oil pollution problem ③ recently before the birth of the laser hair technology (laser texturing), high energy density, high-repetition- fused form, the frequency of the pulse laser predetermined morphology and geometric distribution in the surface of the cold roll texturing roll rolling out high-quality cold-rolled sheet. Laser texturing and peening hair and EDM texturing advantages: high hardness of the roll, extend the service life can be increased by 12.5%, Kunming Iron and Steel Cold Rolling Mill trial showed that: in the past without the texturing processing temper mill work rolls roll changing period average of 200 tons / after laser hair treatment, the life cycle of up to 600 Dayton /; roll surface roughness uniform, controllable, can significantly improve the texturing plate deep drawability and Tu plating performance; laser texturing process, no noise, no pollution. Laser texturing in the field of international wool forward-looking and market prospects, the state attaches great importance to the technology, already included in the Eighth Five-Year Plan "period of key research topics. In the 1990s, China's industrial, scientific and university with a mechanical modulator, high-power Co2 laser equipment and high-power YAG laser with Q-switched equipment, hair treatment on the roll surface, and achieved good results. Laser texturing equipment is still far not reached the market-oriented, in part because of publicity is not enough, the vendors do not have depth and sufficient understanding of laser texturing compared to the advantages and disadvantages of the conventional texturing process. Laser texturing has been successfully applied to various types of cold-rolled sheet in China, precision strip steel and special steel strip production, domestic use of laser texturing equipment, large steel mill Baosteel, Wuhan, Kunming Iron and Steel, Jinan Iron and Steel, as the laser hair of the market matures, more and more small and medium sized steel mills will use laser texturing the new process. Competition is so fierce in the cold rolled sheet, laser texturing a lot of cold-rolled sheet manufacturers pointed out to stay alive. There are two main basis, the best one is the current quality of laser texturing plate. The number of cold-rolled steel, a senior expert, a division of Standard quality grade cold-rolled sheet of the next century. They believe that: a product is laser texturing plate, two types of products is a EDM texturing board; three categories of products other types of board. The correctness of this standard has been confirmed by Wuhan Iron and Steel, Kunming Steel, Jinan Steel and Tangshan built the dragon. Of our customers have laser hair of the board, including the coating performance, quality, including the deep-drawing performance significantly better than the quality of the board of the EDM texturing. The second basis is the lowest cost of the board of the world of laser hair, laser texturing process, compared to the EDM texturing process equipment price and operating costs are much lower, roll over the amount of steel doubled, reduce the consumption of the roll. Therefore, the use of laser texturing cold-rolled sheet for enterprises to reduce costs and enhance profit margins. 1.2 cold-rolled sheet used for? General cold-rolled sheet and wool board is the difference? Cold-rolled plates and hot-rolled plates corresponding to the difference between them not in the smelting process, but is rolling temperature, or the rolling termination temperature. The final rolling temperature is lower than steel the recrystallization temperature of cold-rolled steel. The easy rolling hot-rolled, high efficiency rolling of steel hot-rolled condition is easily oxidized, the product surface is black and gray dim. The cold rolling process in order to eliminate the work hardening intermediate annealing, so the cost is high, but the bright surface of cold rolled steel, good quality, high dimensional accuracy can be directly used for processed products. Cold-rolled strip is widely used, such as automobile manufacturing, electrical products, rolling stock, aerospace, precision instruments, food cans, etc.. Cold-rolled steel sheet has a special textured surface morphology has been widely applied in manufacturing. In forming process, the density of small pits on the textured steel store lubricant to improve lubrication conditions; textured surface coating and the steel surface contact area increases, the enhanced adsorption capacity of the paint. High value-added of textured cold-rolled steel. 2.2 laser hair of the principle of laser hair texturing gross roll and sheet (strip)