In the processing technology of the medium-high power 4000w fiber laser cutting machine, the section of carbon steel can be cut very smoothly to achieve a “mirror surface” effect, which we call “bright surface cutting”. Of course, the bright surface cutting is first used for medium and thick carbon steel, and the carbon steel plate is too thin or too thick to achieve bright surface cutting. So how to achieve bright surface cutting?
1. Control the cutting speed
Fiber laser cutting machine cutting speed too fast can easily lead to incomplete burning of the carbon steel plate and unable to cut through the carbon steel, while too slow speed will lead to excessive burning and melting and deformation of the carbon steel. Therefore, under the premise of ensuring that the carbon steel is not deformed, the cutting speed should be increased as much as possible to achieve rapid penetration.
2. Adjust the cutting air pressure
When carbon steel undergoes oxygen cutting, the combustion of the material will release a lot of heat, so the oxygen pressure cannot 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 amount of blocking air pressure is generally increased.
3. Adjust the nozzle height
The height of the nozzle will affect the beam quality, oxygen purity and gas flow direction. The lower the nozzle, the better the beam quality. The higher the oxygen purity, the smaller the gas flow direction. Therefore, the nozzle height should be adjusted as low as possible for bright surface cutting.
4. Adjust the cutting focus
The beam ejected from the nozzle of the fiber laser has a certain diameter. When cutting the bright surface, the nozzle generally 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 can even directly cause damage to the nozzle. Therefore, it is necessary to find out the maximum focus value that the nozzle size can bear, and then adjust it.
5. Adjust the cutting power
Regarding plates of different thicknesses, the greater the thickness, the higher the required power. On the contrary, the smaller the thickness, the lower the required power. Therefore, the power should be adjusted according to the actual thickness of the plate to achieve the best cutting power.
Of course, the use of laser cutting machines to cut sheets to achieve bright surface cutting is definitely not limited to these factors. This requires our operators to practice in actual operation, gradually improve the cutting process, and cut out bright surface craftwork.
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