Commonly used laser cutting machines are: SJ-2500 CNC laser cutting machine, using CO2 continuous laser, output power is 450-500w, processing sheet thickness zui is 6mm, feed rate is 5-20cm/min, GFQ1-150 Type CO2 laser welding and cutting machine, output power 90-150w, carbon steel, alloy steel, stainless steel, etc. with a thickness of about 1mm, and can cut quartz, ceramic glass, plastic, template, cardboard with a thickness of 10mm or less. Non-metallic materials such as rubber. Laser cutting head 1. Selection of laser cutting process parameters (1) Light speed mode For laser cutting, the fundamental mode light speed can be focused into a smaller spot to achieve high power density (two orders of magnitude higher than multimode beam). The cut metal should be circularly polarized with a fundamental beam. (2) Laser power and cutting speed The laser power depends on the material, thickness and cutting speed. The higher the power, the higher the cutting speed. When the power is constant, the cutting speed can be reduced with the thickness. (3) Lens focal length and defocusing lens The focal length of the lens is small, the power density after beam focusing is high, but the depth of focus is not large, suitable for high-speed cutting of thin parts; the focal length is large, the power density is low, but the depth of focus is large, which can be used for cutting Thick workpiece. The distance between the focus and the surface of the workpiece—the amount of defocus also has an effect on the width of the slit. The value of the Zui is 1/3 of the thickness below the surface of the workpiece. Inappropriate defocusing will significantly increase the kerf width. (4) Auxiliary gas type and flow rate Oxygen as an auxiliary gas can generate a large amount of heat due to intense oxidation reaction, which is advantageous for increasing the cutting speed and thickness. When argon is used as the auxiliary gas, there is no oxidation, and the edge of the slit is clean, but the lower edge is prone to slag and is difficult to remove. As the oxygen flow increases, the kerf width will decrease. The pulse cutting has a very small slit width and is suitable for precision cutting of complex shaped workpieces. (5) Polarization direction The laser polarization direction is modulated by an appropriate reflection or refraction mirror, and the width of the laser-cut kerf in different directions of pigs will be significantly different, but when laser cutting non-metal and high-suction materials, this effect is not presence. (6) Nozzle The shape and size of the nozzle are also important parameters that affect the cutting quality, pressure distribution and cutting speed. Different cutting machine nozzle shapes are also different. The specific shape and parameters are generally determined by trial cutting. (7) The distance from the nozzle to the surface of the workpiece The nozzle opening is too close to the surface of the workpiece, which affects the dispersing ability of the splashing and cutting slag, but the nozzle opening is too far from the surface of the workpiece, which also causes unnecessary energy loss. Generally, the distance between the workpiece and the nozzle opening is 1-2 mm. The cutting of the profiled workpiece mainly relies on the automatic height adjustment device to constant the distance from the nozzle opening to the workpiece.