It is believed that many people played a game when they were young, that is, lighting paper or leaves with magnifying glass and the heat of the sun. We all know that we must adjust the appropriate focus at this time to maximize the use of the sun’s energy to ignite objects.
Similarly, when the optical fiber laser cutting machine is cutting, the cutting quality will be different with different focal lengths.
Therefore, in order to improve the cutting quality of the optical fiber laser cutting machine, it is very important to reasonably adjust the focal length of the optical fiber laser cutting machine.
However, how should the focal length of the optical fiber laser cutting machine be adjusted?
Let’s get to know:
When the focus of the optical fiber laser cutting machine is in the best position, the cutting result can be the best with the smallest kerf and the highest efficiency.
Different laser focus positions correspond to different roughness of the cutting surface. The adjustment of the focus position for optimizing the cutting quality of the optical fiber laser cutting machine is determined by the fact that the cutting focus is located on the cutting material:
1. Negative focal length
Negative focus (the cutting focus is on the cutting material) is mainly used when cutting metal plates with high thickness.
The negative focus cutting thick plate requires a large cutting range, and the oxygen delivered to the nozzle is insufficient to reduce the cutting temperature. The cutting surface is relatively rough, which is not suitable for high-precision precision cutting.
2. Internal negative focal length
Internal negative focal length (the cutting focus is inside the cutting material) is usually applied to optical fiber laser cutting machine in cutting aluminum, aluminum alloy, stainless steel and other materials.
Cut the surface according to the focus principle, and the cutting amplitude is larger than the cutting point on the workpiece surface. In this mode, the air flow is large, the temperature is high, and the cutting and piercing time is slightly longer.
Therefore, this cutting method is mainly used in cutting materials with high hardness such as aluminum or stainless steel.
3. 0 Focus
0 focal length (the cutting focus is on the surface of the cutting material) is usually a focus positioning method applicable to cutting SS41, SPH, SPC and other materials.
The focus of 0 focal length cutting is close to the workpiece surface. Because the upper and lower smoothness of the cutting surface is different, the upper surface is relatively smooth while the lower surface is relatively rough when cutting.
This method of cutting focus positioning needs to be determined according to the actual process requirements of the upper and lower surfaces.
It is very important to determine the focus position of the optical fiber laser cutting machine according to the actual situation. Only a reasonable focus position can maximize the use of laser energy and make the optical fiber laser cutting machine work more reasonably.