How to cut good samples with laser cutting machine! Laser engraving machine manufacturer
In laser cutting machine, several key technologies must be mastered and solved for parts with high cutting accuracy or large thickness. Focus position control is one of them. One of the advantages of laser cutting is that the energy density of the beam is high, so the diameter of the focus spot should be as small as possible to produce a narrow slit. Because the smaller the focal depth of the focusing lens, the smaller the focal spot diameter. For high-quality cutting, the effective focal depth is also related to the lens diameter and the material to be cut. Therefore, the position of the control focus relative to the surface of the material to be cut is very important.
Because the laser power density has a great influence on the cutting speed, the selection of lens focal length is an important issue. After the laser beam is focused, the spot size is proportional to the focal length of the lens. After the beam is focused by the short focal length lens, the spot size is very small, and the power density at the focal point is very high, which is favorable for material cutting; However, its disadvantages are that the focal depth is very short and the adjustment margin is small, which is generally suitable for high-speed cutting of thin materials. As long focal length lens has wide focal depth, it is more suitable for cutting thick workpieces as long as it has sufficient power density.
After determining which focal length lens to use, the relative position of the focus and the workpiece surface is particularly important to ensure the cutting quality. Because of the high power density at the focus, in most cases, the focus position is just on the workpiece surface or slightly below the surface when cutting. In the whole cutting process, it is an important condition to ensure that the relative position between the focus and the workpiece is constant to obtain stable cutting quality.
