1. Cutting the focus on the workpiece
In this way, we also become a negative focal length because the cutting point is not located on the surface of the cutting material nor inside the cutting material, but rather above the cutting material. This method mainly uses materials with high cutting thickness. The reason why this method is positioned above the cutting material is mainly that the slits required for the thick plates are large, otherwise, the oxygen delivered by the nozzles is extremely likely to cause insufficient defects and the cutting temperature is lowered. One disadvantage of this approach, however, is that the cut surface is rough and not very useful for high precision cuts.
2. Cutting the focus inside the workpiece
This method also becomes a positive focal length. When you need to cut a workpiece that is stainless steel or aluminium steel, the pattern of cutting points inside the workpiece is often used. However, one disadvantage of this method is that the cutting surface is larger than the cutting point on the surface of the workpiece due to the focus principle. At the same time, the cutting airflow required in this mode is large, the temperature is sufficient, and the cutting perforation time is slightly longer. Therefore, when the material of the workpiece you choose is mainly stainless steel or aluminium material, the hardness of the material is selected.
3. Cutting the focus on the surface of the workpiece
This method also becomes 0 focal lengths, which is commonly used in the cutting of SPC, SPH, SS41 and other workpieces. When used, the focus of the cutting machine is selected close to the surface of the workpiece. The smoothness of the upper and lower surfaces of the workpiece in this mode is different. The near-focus cutting surface is relatively smooth, while the lower surface away from the cutting focus appears rough. This mode should be based on the process requirements of the upper and lower surfaces in the actual application.
In summary, we use laser cutting machine to process different workpieces, which need to use different focus modes, which can give full play to the performance advantages of laser cutting machine.