1. Cutting 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 is it located inside the cutting material, but is located above the cutting material. This method is mainly used with cutting materials with high thickness. The reason why the focus of this approach is on the cutting material is mainly due to the need for thicker cuts of the thick plate, otherwise the oxygen delivered by the nozzle is extremely prone to cause insufficient and the cutting temperature is reduced. However, one of the disadvantages of this approach is that the cutting surface is rough and not very practical for high-precision cutting.
2 cutting focus inside the workpiece
This method also becomes a positive focal length. When you need to cut the workpiece is stainless steel or aluminum steel plate commonly used cutting point in the workpiece inside the model. However, one disadvantage of this method is that, because the focal principle cuts the surface, the cutting width is relatively larger than the cutting point at the surface of the workpiece. At the same time, the required cutting airflow in this mode is large, the temperature is sufficient, and the cutting perforation time is slightly longer. So when you choose the workpiece material is mainly stainless steel or aluminum material hardness of the material used when the choice.
3 cutting focus on the workpiece surface
This method also becomes 0 focal length, which is commonly used when SPC, SPH, SS41 and other workpieces are cut. When using, the focus of the cutter 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 not the same. The cutting surface that is close to the focal point is relatively smooth, while the lower surface that is distant from the cutting focal point appears rough. This mode should be based on the process requirements of the upper and lower surfaces in practical applications.
In summary, we use the laser cutting machine to process different workpieces and need to use different focus modes correspondingly, which can give full play to the performance advantages of the laser cutting machine.