Dec 31, 2018
Several key technologies of laser cutting machine are the integrated technology of light, machine and electric integration. The parameters of laser beam, the performance and precision of machine and CNC system in laser cutting machine directly affect the efficiency and quality of laser cutting.
Especially for parts with high cutting accuracy or larger thickness, the following key technologies must be mastered and solved: 1. Focus position Control technology: one of the advantages of laser cutting is the high energy density of the beam, which is generally 10W/cm2. Because the energy density is proportional to the 4/ΠD2, the focus spot diameter is as small as possible in order to produce a narrow cut seam, while 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 diameter of the focal spot. But cutting has a splash, the lens is too close to the workpiece to damage the lens, so the general high-power CO2 laser cutting machine industrial applications widely used 5〃~7.5〃"(127~190mm) focal length. The actual focus spot diameter is between 0.1~0.4mm. For high quality cutting, the effective focal depth is also related to lens diameter and cut material. For example, with a 5〃 lens cut carbon steel, coke deep focal length within +2% range, that is, about 5mm. Therefore, it is important to control the focus relative to the position of the surface of the cut material. Concerned about cutting quality, cutting speed and other factors, in principle 6mm of metal materials, focus on the surface, 6mm of carbon steel, focus on the surface, 6mm of stainless steel, focus under the surface. The specific dimensions are determined by the experiment.