Different focus modes are required for cutting different workpieces on the workpiece surface of laser cutting machine. The laser focus is above the cutting workpiece surface
When cutting stainless steel with air and nitrogen, the negative focus is generally selected, and the laser focus is below the surface of the cutting workpiece. This mode is mainly used to cut thick materials.
Only by choosing the appropriate focus cutting method can the performance advantages of the laser cutting machine be brought into play. The main reason for putting the cutting focus on the cutting material is that the thick plate needs a large cutting range, otherwise the oxygen delivered by the nozzle is prone to lack of oxygen, resulting in the reduction of cutting temperature.
Position of focus. 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, the laser focus is on the surface of the cutting workpiece, and the positive focus is generally selected for oxygen cutting carbon steel plate, Therefore, the workpiece material is selected when stainless steel or aluminum and other materials with high hardness are selected.
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