How to find the focal position of the fiber laser cutting machine?

1. Focus on the surface of the plate

This method also becomes 0 focal length. When using, select the cutting machine focus close to the workpiece surface. The smoothness of the upper and lower surfaces of the workpiece is different in this mode. Generally speaking, the cutting surface close to the focus is smoother, while the cutting surface far from the cutting focus is relatively smooth. The lower surface appears rough. This method should be determined according to the process requirements of the upper and lower surfaces in practical applications.

2. Focus on the inside of the plate

This also becomes a positive focal length. When the workpiece to be cut is stainless steel or aluminum steel plate, the mode in which the cutting point is inside the workpiece is often used. However, one disadvantage of this method is that due to the focusing principle, the cutting width is relatively larger than the cutting point on the surface of the workpiece. At the same time, the cutting airflow required for this method is large, the temperature is sufficient, and the cutting and perforation time is slightly longer. Therefore, when selecting the workpiece material, stainless steel or aluminum with higher hardness is mainly used.

3. Focus on the plate

In this way, we also have a negative focal length, because the cutting point is neither on the surface of the cut material nor inside the cut material, but above the cut material. This method is mainly used for cutting high-thickness materials. The reason for positioning the focus above the cutting material is mainly because thick plates require a larger cutting width, otherwise the oxygen delivered by the nozzle is likely to be insufficient and the cutting temperature will drop. However, one disadvantage of this method is that the cutting surface is relatively rough, which is not practical for high-precision cutting.

In short, the focus position should vary depending on the cutting material.

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CO2 Laser Cutting Machine