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Laser cutting machine controls cutting quality

First, the impact of focus position adjustment on cutting quality

Since the laser power density has a great influence on the cutting speed, the selection of the lens focal length is an important issue. After the laser beam is focused, the spot size is proportional to the focal length of the lens. After the beam is focused by the short focal length lens, the spot size is small, and the power density at the focus is high, which is good for material cutting. However, its shortcoming is that the depth of focus is very short and the adjustment margin is adjusted. Small, generally suitable for high-speed cutting of thin materials. Since the long focal length lens has a wide focal depth, it is suitable for cutting thick workpieces as long as it has sufficient power density. 7” cut off disc for metal ensuring a constant relative position of the focus to the workpiece during the entire cutting process is an important condition for obtaining a stable cutting quality. Sometimes, the lens is heated due to poor cooling and causes a change in focal length, which requires timely adjustment of the focus position. When the focus is in a better position, the slit is smaller and the efficiency is higher, and the better cutting speed can obtain better cutting results. In most applications, the beam focus is adjusted just below the nozzle. The distance between the nozzle and the surface of the workpiece is generally about 1.5 mm.

Second, the impact of cutting speed on cutting quality

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For a given laser power density and material, the cutting speed is in accordance with an empirical formula. As long as the threshold is above the pass threshold, the cutting speed of the material is proportional to the laser power density, ie increasing the power density increases the cutting speed. The power density referred to here is related not only to the laser output power, but also to the beam quality mode. In addition, the characteristics of the beam focusing system, that is, the spot size after focusing, also have a large effect on laser cutting.7” cut off disc for metal Especially for metal materials, the laser cutting speed can have a relative adjustment range while maintaining other process variables while maintaining a satisfactory cutting quality. This adjustment range is slightly thicker than when cutting thin metal. width. Sometimes, the slower cutting speed will also cause the hot melt material to be ablated to ablate the surface of the mouth, making the cut surface rough.

Third, the impact of laser output power on cutting quality

For a continuous wave output laser, the laser power size and mode will have an important impact on the cutting. In actual operation, it is often necessary to set a larger power to obtain a higher cutting speed, or to cut a thicker material. However, the beam mode (the distribution of the beam energy in the cross section) is sometimes more important, and the mode often changes slightly as the output power is increased. The modes are not consistent during the entire effective working life of the laser. The condition of the optics, subtle changes in the laser working mixture, and flow fluctuations all affect the mode mechanism.

In summary, although the factors affecting the laser cutting machine are more complicated, the cutting speed, focus position and laser output power are three important variables. In the cutting process, if the quality of the cut is found to be significantly worse, the factors discussed above should be checked first and adjusted in time.

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