The laser cutting machine cuts different workpieces on the workpiece surface, requiring different focus modes. The laser focus is above the surface of the workpiece being cut
When cutting stainless steel with air and nitrogen, the negative focus is generally selected, and the laser focus is below the surface of the workpiece being cut. This mode is mainly used for cutting thick materials.
The performance advantage of the laser cutting machine can be brought into play only by selecting the appropriate focus cutting method. The reason why the cutting focus is placed on the cutting material is that the cutting range required for thick plates is large, otherwise the oxygen delivered by the nozzle is prone to oxygen deficiency, resulting in a decrease in cutting temperature.
The position of the focal point. In this mode, because the focus is far away from the cutting surface of the cutting material, the cutting range is larger than the cutting point on the workpiece surface, and the required cutting air flow is larger and the temperature is higher, which has an impact on the window and cutting section of the plate. The cutting perforation time is slightly longer. When the focus is zero focus, the laser focus is generally selected as the positive focus when cutting carbon steel plates on the workpiece surface, Therefore, when the workpiece material is high hardness material such as stainless steel or aluminum.