⑴ Good cutting quality ① The laser cutting incision is thin and narrow, both sides of the slit are parallel and perpendicular to the surface, and the dimensional accuracy of the cut parts can reach ±0.05mm. ② The cutting surface is smooth and beautiful, with a surface roughness of only tens of microns. Even laser cutting can be used as the last process. No mechanical processing is required, and the parts can be used directly. ③ After the material is laser cut, the width of the heat-affected zone is very small, and the performance of the material near the cutting seam is almost unaffected. The deformation of the workpiece is small, the cutting accuracy is high, the geometry of the cutting seam is good, and the cross-sectional shape of the cutting seam is relatively regular. rectangle. The comparison of laser cutting, oxyacetylene cutting and plasma cutting methods is shown in Table 1. The cutting material is 6.2mm thick low carbon steel plate. ⑵ High cutting efficiency Due to the transmission characteristics of laser, laser cutting machines are generally equipped with multiple CNC worktables, and the entire cutting process can be fully CNC controlled. During operation, just by changing the CNC program, it can be used for cutting parts of different shapes, and can perform both two-dimensional and three-dimensional cutting. ⑶ Fast cutting speed: Using a 1200W laser to cut a 2mm thick mild steel plate, the cutting speed can reach 600cm/min; cutting a 5mm thick polypropylene resin plate, the cutting speed can reach 1200cm/min. Materials do not need to be clamped during laser cutting. ⑷ Non-contact cutting: There is no contact between the cutting torch and the workpiece during laser cutting, and there is no tool wear. To process parts of different shapes, there is no need to change the "tool", just change the output parameters of the laser. The laser cutting process has low noise, small vibration and no pollution. ⑸ There are many types of cutting materials. Compared with oxyacetylene cutting and plasma cutting, there are many types of laser cutting materials, including metals, non-metals, metal-based and non-metal-based composite materials, leather, wood and fibers. However, different materials show different laser cutting adaptability due to their different thermophysical properties and laser absorption rates. Using CO2 laser, the laser cutting performance of various materials is shown in Table 2. Most laser cutting machines are controlled by CNC programs or made into cutting robots. As a precision processing method, laser cutting can cut almost all materials, including two-dimensional or three-dimensional cutting of thin metal plates. In the field of automobile manufacturing, cutting technology for spatial curves such as car roof windows has been widely used. Volkswagen of Germany uses a 500W laser to cut body sheets with complex shapes and various curved parts. In the aerospace field, aerospace parts processed by laser cutting include engine flame barrels, titanium alloy thin-walled casings, aircraft frames, titanium alloy skins, wing stringers, tail panel panels, helicopter main rotors, and space shuttle ceramics. Insulation tiles, etc. Laser cutting and forming technology is also widely used in the field of non-metallic materials. Such as silicon nitride, ceramics, quartz, etc.; flexible materials, such as cloth, paper, plastic plates, rubber, etc.