In the Jinan building materials market, laser cutting power density has a significant impact on cutting speed, and the selection of lens focal length is an important issue. The size of the light spot is positively correlated with the focal length of the lens after the laser beam is focused. After focusing with a short lens focal length lens, the size of the laser spot is not large, and the power at the focal point is very high, which is very helpful for cutting raw materials.
The relationship between the focal length of the lens and the position of the workpiece surface is crucial for ensuring cutting quality. Because the power at the focal point is very high, in many cases, the cutting area is only on the surface of the material or slightly below the surface. Ensuring that the relationship between the focal point and the workpiece position does not change is an important condition for achieving stable drilling quality in all drilling processes. Sometimes, due to poor cooling, the camera lens can be heated, causing changes in the focal length of the lens. Therefore, it is necessary to promptly correct the focal length of the lens.
In most applications, the focus of light is adjusted below the nozzle. The distance between the nozzle and the material surface is generally around 1.5mm. Generally speaking, the cutting of raw materials requires assistance with the vapor body. The main challenges include assisting with gas types and working pressure. In general, the direction of assisting gas injection is the same as the direction of laser injection to ensure that the lens is not contaminated and to blow away the slag at the bottom of the cutting area. For non-metallic materials and other metal composite materials, use compressed gas or rare gas to eliminate melting and evaporation of raw materials, while suppressing excessive ignition in the cutting area.
For most metal laser cutting, the active gas (usually O2) reacts with molten steel to form an air oxidation chemical reaction, which can increase the cutting rate by 1/3-1/2. Air pressure is a very important factor in ensuring the assistance of the steam body. When cutting thin materials quickly, a frontal cyclone is required to avoid slag sticking on the opposite side of the wound (hot slag sticking to the product workpiece can also damage the cutting edge). When the thickness of raw materials increases or the cutting rate slows down, the standard air pressure should be adjusted appropriately. To avoid frost on the plastic cutting edge, a relatively low standard air pressure should be used for cutting.