How to determine the cutting focus position of laser cutting machine

by:VENTECH     2022-02-17

Guide: One of the advantages of laser cutting is that the energy density of the beam is high, so the focal spot diameter will be as small as possible in order to produce extremely tiny slits. Because the smaller the focal depth of the focusing lens, the smaller the diameter of the focal spot. For high-quality, high-precision cutting, the effective focal depth is also related to the lens diameter and the material to be cut, so it is very important to control the position of the focus and the surface of the material to be cut.



We analyze the cutting focus from the following three aspects to make different choices due to different materials and requirements.


1. The cutting focus is on the surface of the workpiece


This method also becomes 0 focal length, which is generally used when cutting workpieces such as SPC, SPH, SS41, etc. When using, the focus of the cutting machine is selected close to the surface of the workpiece. In this mode, the upper and lower surfaces of the workpiece are smooth The degree is different. Generally speaking, the cutting surface close to the focus is relatively smooth, while the lower surface far away from the cutting focus appears rough. This mode should be determined according to the process requirements of the upper surface and the lower surface in the actual application.


2, the cutting focus is inside the workpiece


This method also becomes a positive focal length. When the workpiece you need to cut is stainless steel or aluminum steel plate, the mode that the cutting point is inside the workpiece is often used. But one disadvantage of this method is that due to the focus principle of cutting the surface, the cutting width is relatively larger than the cutting point on the surface of the workpiece. At the same time, the cutting airflow required in this mode is larger, the temperature is sufficient, and the cutting and piercing time is slightly longer. So when you choose the material of the workpiece is mainly stainless steel or aluminum with high hardness, choose it.


3. The cutting focus is 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 or inside the cutting material, but located above the cutting material. This method mainly uses and cuts high-thickness materials. The reason why the focus is positioned above the cutting material in this way is mainly because the thick plate requires a large cutting width, otherwise the oxygen delivered by the nozzle is very likely to be insufficient and cause the cutting temperature to drop. But one disadvantage of this method is that the cutting surface is relatively rough, which is not practical for high-precision cutting.


Falilei provides you with a variety of laser cutting machines and laser processing services, allowing you to easily solve cutting and processing problems. If you have any questions, you can contact us and we will have a professional engineer to answer you in detail for free. Consultation hotline:


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