How to control the fiber laser cutting quality
How to control the fiber laser 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 choice of lens focal length is an important issue. After the laser beam focusing, the spot size is proportional to the focal length of the lens. After the beam 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 disadvantage is that the depth of focus is very short and the adjustment margin is few, generally suitable for high-speed cutting of thin materials. Since the telephoto long lens has a wide focal depth, it is suitable for cutting thick workpieces as long as it has sufficient power density.
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.
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. Increasing the power density increases the cutting speed. The power density referred to here is not only to the laser output power, but also to the beam quality mode. In addition,the spot size after focusing, also have a large effect on laser cutting.
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 varies slightly when 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.
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