When is the best time to adjust the focal length of a laser cutting machine? The distance between the laser focus and the cutting material. How many focal lengths does laser cutting equipment have? Different focal points often result in varying degrees of material cutting. It is very important to adjust the focal length of the fiber laser cutting machine reasonably. In fact, if the focus of the laser cutting board is not adjusted, it doesn't matter much. If laser cutting thick plates, the focus and speed have a significant impact on slag deposition. In general, if there is slag hanging, priority should be given to whether the air pressure is too low or too slow. If not, we need to adjust the frequency or correct optical path. We need to understand several focal lengths of fiber laser cutting machines.

Three types of fiber laser cutting machine focal lengths

When the focus of the fiber laser cutting machine is in the optimal position, the smallest cutting seam and the highest efficiency can achieve the best cutting results. The following are the focal lengths of three types of fiber laser cutting machines. Negative focal length (the cutting focus is located on the cutting material) is mainly used for cutting thick metal plates. The cutting range required for cutting thick plates with negative focal length is relatively large, resulting in insufficient oxygen delivered by the nozzle and reducing the cutting temperature. The cutting surface is relatively rough and not suitable for high-precision precision cutting.

Inner negative focal length

Fiber laser cutting machines are usually used to cut materials such as aluminum, aluminum alloys, and stainless steel. Cutting the surface according to the principle of focus, with a larger cutting amplitude, the fiber laser cutting machine has a large cutting airflow, high temperature, and slightly longer cutting perforation time. Therefore, this cutting method is mainly used for cutting materials with high hardness, such as aluminum or stainless steel (the cutting focus is located on the surface of the cutting material), and is usually used for cutting SPH and SPC, a focus positioning method suitable for materials. The focus of the 0 focal length cutting is close to the surface of the workpiece. Due to the different smoothness of the cutting surface, the upper surface is relatively smooth and the lower surface is relatively rough during cutting. This cutting focus positioning method needs to be determined based on the actual process requirements of the upper and lower surfaces.

It is very important to determine the focal position of the fiber laser cutting machine based on the actual situation, and a reasonable focal position can make the operation of the fiber laser cutting machine more reasonable.

Focus position relationship of fiber laser cutting machine: composed of the workpiece surface focus fiber laser cutting machine.

In this mode, the smoothness of the upper and lower surfaces of the workpiece varies. Generally speaking, the cutting surface near the focus is relatively smooth, while the lower surface far from the cutting focus is rough. This mode should be determined based on the process requirements of the upper and lower surfaces in practical applications.

Focus position relationship of fiber laser cutting machine: workpiece focus

This method is also known as positive focal length. When you need to cut stainless steel and aluminum steel plates, you usually use the mode of cutting points in the workpiece. However, one drawback of this method is that due to the focus being far from the cutting surface, the cutting amplitude is greater than the cutting point on the workpiece surface. At the same time, this mode requires a large cutting airflow, sufficient temperature, and slightly longer cutting and perforation time. Therefore, when the workpiece material you choose is mainly materials with higher hardness such as stainless steel or aluminum.