How to determine the cutting focus when using a laser cutting machine?

How to determine the cutting focus when using a laser cutting machine? Shenyang laser cutting manufacturer explains to you:

1. Cutting focus on the surface of the workpiece: This method is also known as zero focal length and is commonly used for cutting workpieces such as SPC, SPH, SS41, etc. When using, the focus of the cutting machine is selected to be close to the surface of the workpiece. In this mode, the smoothness of the upper and lower surfaces of the workpiece is different. Generally speaking, the cutting surface close to the focus is relatively smooth, while the lower surface far away from the cutting focus appears rough. This mode should be determined according to the process requirements of the upper and lower surfaces in practical applications.

2. Cutting focus inside the workpiece: This method is also known as positive focal length. When the workpiece you need to cut is stainless steel or aluminum steel plate, the commonly used cutting point is inside the workpiece. But one disadvantage of this method is that due to the principle of focus cutting, the cutting amplitude is relatively larger than the cutting point on the surface of the workpiece. At the same time, this mode requires a larger cutting airflow, sufficient temperature, and slightly longer cutting and perforation time. So when you choose stainless steel or aluminum as the main material for the workpiece, choose materials with high hardness.

3. Cutting focus on the workpiece: This method is also known as negative focal length, because the cutting point of the laser cutting machine is not located on the surface or inside of the cutting material, but is positioned above the cutting material. This method is mainly used for cutting materials with high thickness. The reason why this method positions the focus above the cutting material is mainly because thick plates require a large cutting width, otherwise the oxygen delivered by the nozzle may be insufficient, resulting in a decrease in cutting temperature.

The main advantage of laser cutting machine cutting is that the energy density of the laser beam is high, so the focal spot diameter is as small as possible to produce narrow cuts. Because the smaller the focal depth of the focusing lens, the smaller the diameter of the focal spot. For high-quality cutting, the effective focal depth is also related to the lens diameter and the material being cut. Therefore, controlling the position of the focus relative to the surface of the material being cut is crucial.

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