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Fiber laser cutting machine automatic focusing technology – Graphic explanation

Fiber Laser Cutting Machine

When the fiber laser cutting machine is cutting different materials, the focus point of the laser beam should fall on different positions of the material as required. As shown below.

Therefore, when cutting different materials, the focus position of the laser cutting machine needs to be adjusted. In the previous laser cutting machines, manual focusing was generally used to adjust the focus. Nowadays, there are many manufacturers, The original focusing method was abandoned, the machine was improved, and automatic focusing was realized.

Fiber laser cutting machine

Someone might say here, isn’t it just changing the height of the cutting head? If the relative height of the cutting head and the material is high, the focus position of the focus is high, and the height of the laser cutting head is low, but the focus position is relatively low? What’s so difficult? The theory is like this, but in practice it is not so simple.

Like the picture below, we can see that the bottom of the laser cutting head is the nozzle. In the process of cutting the workpiece, the distance between the nozzle and the material is about 0.5-1.5mm. It is better to regard it as a fixed value, even if the height of the nozzle does not change, so we cannot adjust it by lifting the laser cutting head. Coke.

Fiber laser cutting machine

The focal length of the focusing lens cannot be changed, so the focus cannot be adjusted by changing the focal length of the focusing lens.

If we change the position of the focusing lens, the position of the focus will change: the position of the focusing lens drops, and the position of the focus drops. On the contrary, the opposite is true. This is indeed a way to adjust the focus of the laser cutting machine. This method requires the use of a drive motor to control the up and down of the focus lens.

There is also an automatic focusing method: before the laser beam enters the focusing lens, place a reflector lens with variable curvature| (also called adjustable lens), by changing the curvature of the reflector lens, you can change the reflection and divergence of the laser beam Angle, this will also change the position of the focus point. See below.

With the automatic focusing function, the processing efficiency of the laser cutting machine can be significantly improved: the perforation time of thick plates is greatly reduced; when processing workpieces of different materials and different thicknesses, the machine can automatically adjust the focus to the appropriate position quickly.

After the laser cutting machine is equipped with an automatic focusing function, the working efficiency of the laser cutting machine can be significantly improved. When processing workpieces of different thicknesses and materials, the machine can quickly adjust to a position suitable for this material.

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