Does the focus affect metal laser cutting machine accuracy?

Does the focus affect metal laser cutting machine accuracy? Yes.  focus position adjustment is one of the important factors.It affects the cutting quality of metal laser cutting machine.

The density of metal laser power has a great influence on the cutting speed.

The choice of lens focal length is also very important .

After focusing of the laser beam. The spot size is proportional to focal length of the lens.

After the short focal length lens focus the beam. the spot size is small.and the power density at the focus is very high. It is very advantageous for material cutting;

But its disadvantage is : the focus depth is very short. The adjustment width is small. Generally suitable for high-speed cutting of thin materials. Since the long focal length lens has such a wide focal depth. As long as the density of sufficient power is sufficient for cutting thick work pieces.

focus affect metal laser cutting machine accuracy?

Find best focus position

The relative position of the focus to the surface of the workpiece .after determining which focal length lens to use. is particularly important. to ensure the quality of the cut. Since the power density is highest at the focus. in most cases, the focus position at the time of cutting is just below the surface of the workpiece .or slightly below the surface. Therefore, throughout the cutting process.ensuring a constant relative position of the focus and the workpiece  is  important  .for obtaining a stable cutting quality. Sometimes the lens is hot due to poor cooling .and causes a change in focal length. which requires us to adjust the focus position in time.

When the focus is in the best position, the slit is the smallest and the most efficient.and the best cutting speed of the fiber laser cutting machine can obtain the best cutting result.

Distance between the nozzle and sheet surface

In most applications,we should adjust the focus of the beam  just below the nozzle. The distance between the nozzle of the fiber laser cutter .and the surface of the work piece generally about 1.5 mm.

The above is the focus of the impact of the accuracy of the metal laser cutting machine.I hope this article can help everyone.

More questions just let us know.
Jill from XT LASER
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