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Does the focus affect the cutting accuracy of the fiber laser cutting machine?

Does the focus affect the cutting accuracy of the fiber laser cutting machine?

 

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

1. After determining which focal length lens to use, the relative position of the focal point and the workpiece surface is particularly important to ensure the cutting quality. Due to the high power density at the focal point, in most cases, the focal position is just on the workpiece surface or slightly Below the surface. Therefore, to ensure that the relative position of the focus and the workpiece is constant during the entire cutting process is an important condition to obtain stable cutting quality. Sometimes the lens is heated due to poor cooling and the focal length changes, which requires us to adjust the focus in time position.

2. When the focus is in the position, the cutting slit is small and the efficiency is high, and the cutting speed of the fiber laser cutting machine can obtain good cutting results.

3. In most applications, the beam focus should be adjusted just under the nozzle, and 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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