Our company's products are mainly carved and cut through the laser cutting machine. Today, let me introduce the magic machine to you.
Compared with the traditional oxygen acetylene, plasma cutting technology, laser cutting speed, narrow kerf, small heat affected zone, cutting edge, vertical cutting edge smooth, while the type of laser cutting materials, including carbon steel, stainless steel, alloy steel, wood, plastic, rubber, cloth, quartz, ceramic, glass, composite materials etc.. With the rapid development of market economy and the rapid development of science and technology, laser cutting technology has been widely applied in automobile, machinery, electric power, hardware and electrical appliances. In recent years, laser cutting technology is developing at an unprecedented speed, and is increasing at the speed of 15%~20% every year. Since 1985, China has increased by nearly 25% per year. At present, the overall level of laser cutting technology in China is quite different from that of advanced countries. Therefore, laser cutting technology in domestic market has broad prospects for development and huge application space, .
During laser cutting, the beam is focused on a small focus through the lens of the cutting head to achieve high power density at the focus. The cutting head is fixed on the Z axis. At this time, the heat input beam is far more than part of the heat is the material reflection, conduction or diffusion. The material quickly heated to melting and vaporization temperature, at the same time, a high speed air flow from coaxial or non coaxial side will melt and vaporization of the material is blown out, the formation of porous material cutting. With the relative motion of the focus to the material, the hole is made to form a continuous narrow slit that completes the cutting of the material .
At present, the external optical path of the laser cutting machine is mainly used in the flight optical system. The light beam from the laser generator passes through the mirror 1, 2, and 3 to the focus lens on the cutting head, and then the spot is formed on the surface of the material to be processed. The reflector 1 is fixed on the fuselage, and the reflector 2 on the cross beam moves along the X direction with the movement of the cross beam. The reflector 3 on the Z axis moves with the movement of the Z axis for Y direction. It is not difficult to see from the diagram that in the process of cutting, as the beam moves x to motion, the Z axis part moves Y direction, and the length of the optical path changes .
At present, because of the manufacturing cost of the civil laser generator, the laser beam has a certain divergence angle, which is "conical". When the "conical" height changes (equivalent to the length of the laser cutting machine), the area of the beam cross section of the focus lens is also changed. In addition, light also has the nature of wave. Therefore, diffraction phenomenon will inevitably occur. Diffraction will cause transverse propagation of light beam in the propagation process. This phenomenon exists in all optical systems, and can determine the theoretical limit values of these systems in performance. Because the Gauss beam is tapered and diffracted by the light wave, when the length of the optical path changes, the diameter of the beam acting on the lens surface changes at all times, which causes the change of focus size and focus depth, but it has little influence on the focus position. If the size of focus and the depth of focus change in continuous processing, it will have a great impact on processing. For example, the width of the cutting seam will be inconsistent, and the cutting power will not cut or burn the plate at the same cutting power.