Sheet metal processing, which accounts for one-third of metal processing, is widely used in almost all walks of life. The cutting process of sheet metal (thickness of metal sheet below 6mm) is nothing more than plasma cutting, flame cutting, shearing machine , stamping, etc. Among them, laser cutting has emerged and developed vigorously in recent years. Laser cutting has fast speed, high energy density and flexibility. Whether it is in terms of accuracy, speed or efficiency, it is an excellent choice for the sheet metal cutting industry. In a sense, laser cutting machines have brought a technological revolution to sheet metal processing. Laser cutting has fast speed, high energy density and softness. Whether it is in terms of accuracy, speed or efficiency, it is an excellent choice for the sheet metal cutting industry. As a precision machining method, laser cutting can cut almost all materials, including 2D or 3D cutting of thin metal sheets. The laser can be focused into a very small s pot, which can perform micro and precision processing, such as processing of micro slits and micro holes. In addition, it does not need a tool for processing, which belongs to non-contact processing and has no mechanical deformation. Some traditionally difficult to cut or low-quality plates can be easily solved after encountering laser cutting. Especially in the cutting of some carbon steel plates, laser cutting has an unshakable position.