There are two types of laser cutting technology: One is a pulsed laser for metal materials. The second is continuous laser for non-metallic materials, the latter is an important application area of laser cutting technology.
Several key technologies of laser cutting machines are integrated technologies of light, machine and electricity. The parameters of the laser beam, the performance and accuracy of the machine and the CNC system in the laser cutting machine directly affect the efficiency and quality of the laser cutting. Especially for parts with high cutting precision or large thickness, the following key technologies must be mastered and solved:
Focus position control technology
One of the advantages of laser cutting is that the energy density of the beam is high, typically 10 W/cm2. Since the energy density is inversely proportional to the area, the focal spot diameter is as small as possible to produce a narrow slit; and the focal spot diameter is also proportional to the focal depth of the lens. The smaller the focal depth of the focusing lens, the smaller the focal spot diameter. However, the cutting has a splash, and the lens is too close to the workpiece to damage the lens. Therefore, the industrial focus of the high-power CO2 laser cutting machine is widely used in the industrial range of 5〃~7.5〃〞 (127~190mm). The actual focal spot diameter is 0.1~0.4. Between mm. For high-quality cutting, the effective depth of focus is also related to the lens diameter and the material to be cut. For example, a carbon steel is cut with a 5 lens, and the depth of focus is within +2% of the focal length, that is, about 5 mm. The focus is important relative to the position of the surface of the material being cut. Considering the cutting quality, cutting speed and other factors, in principle 6mm metal material, the focus is on the surface; 6mm carbon steel, the focus is above the surface; 6mm stainless steel, focus Below the surface, the specific dimensions are determined experimentally.