When choosing a laser cutting machine, in addition to looking at the price, the important thing is to look at the quality of the laser cutting machine. If the price is cheap and the quality is poor, it will bring more bad effects to the customer's production work. So how to check the quality of the laser cutting machine when choosing a laser cutting machine? The quality of the laser cutting machine is affected by various factors. In order to obtain the ideal cutting quality, each cutting parameter is limited to a narrow range. Relying on repeated experiments to find reasonable cutting parameters under different conditions is not only time-consuming and laborious, but also unable to respond to disturbance factors in the cutting process. How to quickly find better cutting parameters under different cutting conditions and keep them stable during the cutting process is particularly important. Therefore, it is necessary to study on-line detection and real-time control of laser cutting quality. The main indicators of high-quality laser cutting are no cutting defects and a small cutting surface roughness value. Therefore, the target of real-time inspection should be able to identify cutting defects and detect the information reflecting the roughness of the cutting surface. Among them, it is important to obtain the roughness information. The difficulty is also greater. In the detection of the roughness of the cutting surface, an important research result is to find that the dominant frequency of the pulsation spectrum of the optical radiation signal at the cutting front is equal to the frequency of the cutting fringe of the cutting surface, and the frequency of the cutting fringe is related to the roughness. The radiation signal is related to the roughness of the cut surface. The characteristic of this method is that the detection equipment and signal processing system are relatively simple, and the detection and processing speed is fast. Further research has shown that the consistency of the main frequency of the optical radiation signal at the cutting front and the fringe frequency on the cutting surface is limited to a smaller cutting speed. When the cutting speed is greater than a certain cutting speed, the main frequency of the signal disappears, and it can no longer be found. Any information related to cutting stripes. Therefore, only relying on the light radiation intensity signal of the cutting front has great limitations, and it is difficult to obtain valuable information on the surface roughness of the cutting machine at a normal cutting speed, especially the information of the roughness near the lower edge. The use of the visual sensor to monitor the cutting edge and spark shower images at the same time can obtain more comprehensive and rich information about the cutting defects and the roughness of the cutting surface. In particular, the shower of sparks ejected from the lower end of the slit has a close relationship with the quality of the lower edge of the cutting surface, and is an important source of information for obtaining the roughness of the lower edge of the cutting surface. The spectrum and main frequency of the optical radiation signal at the front of the laser cutting machine extracted are only related to the cutting fringes on the upper part of the cutting surface, and do not reflect the cutting fringes on the lower part, and no valuable information is obtained. Because the general cutting surface (except for the cutting of very thin plates) is divided into upper and lower parts, the upper cutting stripes are neat and fine, and the roughness is small; the lower cutting stripes are disordered, and the roughness is large. The roughness is a larger value. The detection signal only reflects the condition of the good quality area, not the condition of the lower quality, and the information of the near lower edge of the poor quality. It is unreasonable and unreliable to use it as a basis for cutting quality evaluation and control. Wuhan Gaoneng Laser Equipment Manufacturing Co., Ltd. is a high-tech enterprise integrating Ru0026D, production and sales of professional laser complete sets of equipment. Not only successfully developed laser equipment with advanced technology, but also used self-support import and export rights to promote products to more than 40 global markets including Hong Kong, South Korea, Vietnam, Malaysia, Thailand, Australia, the United States, Japan, Germany, the Netherlands, Jordan, etc. nation.