How does the laser cutting machine realize bright surface cutting?

How does the laser cutting machine realize bright surface cutting?

In the process technology of the laser cutting machine, the section of carbon steel can be cut very smoothly to achieve a "mirror surface" effect, commonly known as "bright surface cutting". Bright surface cutting is mainly used for medium-thickness carbon steel. Bright surface cutting cannot be achieved if the steel plate is too thin or too thick.

How to cut the bright surface?

First, we must control the cutting speed. Too fast cutting speed will result in incomplete burning of the material and the workpiece cannot be cut through, while too slow speed will result in excessive burning and melting and deformation of the workpiece. On the premise of ensuring the workpiece, the cutting speed should be increased as much as possible.

Second, adjust the nozzle height. The height of the nozzle will affect the beam quality, oxygen purity and gas flow direction. When the nozzle is lower, the beam quality is better. The higher the oxygen purity, the smaller the gas flow direction. Therefore, the height of bright surface cutting should be adjusted as low as possible.

Third, adjust the cutting air pressure. During the oxygen cutting of carbon steel, the combustion of the material will release a lot of heat, so the oxygen pressure should not be too high. Generally speaking, the lower the air pressure in the cutting range, the brighter the cut section. However, in order to ensure cutting stability, a certain percentage is usually increased on the basis of the cutting air pressure.

Fourth, adjust the cutting power. For plates of different thicknesses, the greater the thickness, the higher the power required.

Fifth, adjust the size of the cutting focus. The beam ejected from the nozzle of the fiber laser has a certain diameter. When cutting the bright surface, the nozzle usually used is smaller. If the focus is too large, it will cause the nozzle to become hot and affect the cutting quality and stability. In severe cases, it may even directly damage the nozzle. Therefore, it is necessary to find the maximum focus value that the nozzle size can withstand, and then adjust it.

Sixth, choose the nozzle size. The smaller the half of the nozzle, the brighter the cut section and the better the effect.