Relationship between cutting focus and material of metal laser cutting machine:
1. The cutting focus is on the workpiece surface
This method also becomes 0 focal length. When using, the focus of the cutting machine is selected close to the workpiece surface. The smoothness of the upper and lower surfaces of the workpiece in this mode is different. Generally speaking, the cutting surface close to the focus is relatively smooth, while the lower surface 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. The cutting focus is on the workpiece
In this way, we also become negative focal length, because the cutting point is not located on the surface of the cutting material or inside the cutting material, but located above the cutting material. This method mainly uses materials with high cutting thickness. The reason why this method focuses on the top of the cutting material is mainly because the thick plate needs a large cutting range, otherwise the oxygen delivered by the nozzle is very likely to be insufficient, resulting in the reduction of the cutting temperature. But one disadvantage of this method is that the cutting surface is relatively rough, which is not suitable for high-precision cutting.
3. Cutting focus is inside the workpiece
This method also becomes positive focal length. When the workpiece you need to cut is stainless steel or aluminum steel plate, the mode of cutting point in the workpiece is often used. However, one disadvantage of this method is that due to the focus principle, the cutting amplitude is relatively larger than that of the cutting point on the workpiece surface. At the same time, the cutting air flow required in this mode is larger, the temperature is sufficient, and the cutting perforation time is slightly longer. So when you choose the material of the workpiece mainly stainless steel or aluminum, choose it when the lamp is hard.