Focus affects the cutting accuracy of fiber laser cutting machines

Focus affects the cutting accuracy of fiber laser cutting machines

The influence factor of the cutting quality of fiber laser cutting machine——focus position adjustment

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 The influence factor of the cutting quality of fiber laser cutting machine——focus position adjustment, because the density of laser power has a great influence on the cutting speed, the choice of lens focal length is also an important issue. The spot size after laser beam focusing is proportional to the focal length of the lens. After focusing by a short focal length lens, the spot size is small, and the power density at the focus is very high, which is very advantageous for material cutting; but its disadvantage is that the depth of focus is short and the adjustment margin is small, which is generally suitable for high-speed cutting of thin materials. Since the telephoto long lens has this wide depth of focus, as long as the density of sufficient power is sufficient for cutting thick workpieces.

 
The relative position of the focus to the surface of the workpiece after determining which focal length lens is used is especially important for ensuring 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 at the surface of the workpiece or slightly at the surface. The following. Therefore, ensuring the constant position of the focus and the workpiece during the whole cutting process is an important condition for obtaining a stable cutting quality. Sometimes the lens is heated due to poor cooling and causes a change in the 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 efficiency is the highest. The best cutting speed of the fiber laser cutting machine can get the best cutting result.
 
In most applications, the beam focus should be adjusted just below the nozzle. The distance between the nozzle of the fiber laser cutting machine and the surface of the workpiece is generally about 1.5mm.

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