In metal laser cutting machine for cutting precision or thickness of large parts, how to improve the work efficiency?
Focus position control is one of them. One of the advantages of laser cutting is the high energy density of the beam, so the focal spot diameter is as small as possible in order to produce a narrow slit. Because the smaller the focal depth of the focusing lens is, the smaller the focal spot diameter is. For high-quality cutting, the effective focal depth is also related to the lens diameter and the material being cut. It is therefore important to control the position of the focus relative to the surface of the material being cut.
Since laser power density has a great influence on cutting speed, the selection of lens focal length is an important problem. The size of the spot after laser beam focusing is proportional to the focal length of the lens. The size of the spot after laser beam focusing by a short focal length lens is very small, and the power density at the focus is very high, which is favorable for material cutting. But its disadvantage is that the focal depth is very short, the adjustment allowance is small, generally suitable for high-speed cutting thin materials. Because the long lens has a wide focal depth, as long as it has enough power density, it is suitable for cutting thick workpiece.
After deciding what kind of lens length to use, the relative position of focus and workpiece surface is very important to ensure the cutting quality. Due to the high power density at the focus, in most cases, the focus position is just at the surface of the workpiece, or slightly below the surface.
In the whole cutting process, it is an important condition to obtain stable cutting quality to ensure the relative position of focus and workpiece is constant. Sometimes, the lens works due to poor cooling and heating, resulting in a change in focal length, which requires timely adjustment of the focus position. When the focus is in the right position, the slit is small, the efficiency is high, and the cutting speed can obtain good cutting results. In most applications, the beam focus is adjusted just below the nozzle.
Improve the efficiency of laser cutting machine must also be in the premise of safe production, which is also every enterprise must master. In this way, we can create more value for the enterprise. Do a good job of safe operation, reduce unnecessary losses to the enterprise.