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Laser cutting machine focus position control technology
by：Transon
2020-10-27
Laser cutting is one of the advantages of high energy density beam, general 10 w/cm2.
Due to the energy density is proportional to the 4 / PI d2, so the focal spot diameter as small as possible, in order to produce a narrow kerf width;
At the same time focus spot diameter and is directly proportional to the depth of focus of the lens.
The smaller the focusing lens focal depth, focal spot diameter.
But the laser cutting machine cutting has splash, easy to get too close to the workpiece lens damage, so the general high power CO2 laser cutting machine widely used in industrial application of '5 ~ 7.
5 '('
127~190mm)
The focal length.
The actual focal spot diameter in 0.
1 to 0.
Between 4 mm.
For high quality cutting, the effective depth of focus and is cut and lens diameter and related materials.
With 5 'of lens cutting carbon steel, for example, the focal length of focal deeply + 2% range, namely around 5 mm.
So control focal point relative to the cut material on the surface of the position is very important.
Concern to the cutting quality and cutting speed, in principle, 6 mm of metal materials, focus on the surface;
6 mm carbon steel, focus on the surface;
Below the surface of 6 mm stainless steel, the focus is on.
Specific size determined by experiment.
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