In the process of laser segmentation, the pressure of auxiliary gas has a great influence on the segmentation results. The laser cutting machine concentrates into a high-density beam in the form of light, and the beam is transmitted to the working surface to generate enough heat to melt the material. In addition, the high-pressure gas coaxial with the beam directly removes the molten metal, so as to achieve the purpose of cutting, which shows that the laser cutting processing is essentially different from the machining of machine tools. Laser cutting machine the so-called laser cutting is the energy released when the laser beam irradiates the surface of the workpiece to melt and evaporate the workpiece, so as to achieve the purpose of cutting and carving. It has the characteristics of high precision, fast cutting, not limited to the limitation of cutting patterns, automatic typesetting, material saving, smooth incision, low processing cost, and will gradually improve or replace the traditional metal cutting process equipment. The auxiliary gas must have enough pressure to completely remove the waste residue generated by segmentation. Generally, when dividing a thicker workpiece, the air pressure should be reduced a little, and the residue adhered to the workpiece will destroy the segmentation edge.
Increasing the gas pressure can advance the segmentation speed, but after reaching a maximum value, continuing to increase the gas pressure will lead to a decrease in the segmentation speed. The laser cutting machine concentrates into a high-density beam in the form of light, and the beam is transmitted to the working surface to generate enough heat to melt the material. In addition, the high-pressure gas coaxial with the beam directly removes the molten metal, so as to achieve the purpose of cutting, which shows that the laser cutting processing is essentially different from the machining of machine tools. Laser cutting machine the so-called laser cutting is the energy released when the laser beam irradiates the surface of the workpiece to melt and evaporate the workpiece, so as to achieve the purpose of cutting and carving. It has the characteristics of high precision, fast cutting, not limited to the limitation of cutting patterns, automatic typesetting, material saving, smooth incision, low processing cost, and will gradually improve or replace the traditional metal cutting process equipment. Under high auxiliary gas pressure, the reason for the reduction of cutting speed can be attributed to not only the enhancement of the cooling effect of the hanging action zone by high gas flow velocity, but also the interference of intermittent shock wave in the gas flow to the cooling of the laser action zone. Uneven pressure and temperature in the air flow will cause changes in the density of the air flow field. Such a density gradient causes the refractive index in the field to change, thus drying up the focusing of beam energy, resulting in refocusing or beam divergence. This interference will affect the melting efficiency, and sometimes may change the pattern structure, resulting in the decline of cutting quality. If the beam divergence is too great. Making the light spot too large will even cause serious consequences of not being able to cut effectively.
In order to avoid the adverse reaction of high-speed gas flow to the segmentation performance, it can be envisaged to change the total pressure distribution in the gas flow. Due to this change in the gas flow pressure distribution, the melting process (Gu ò ch é ng) takes place in the central low-pressure area; The surrounding high-pressure area can be increased to enough momentum (impulse) to ensure more effective screening of slag. The laser cutting machine concentrates into a high-density beam in the form of light, and the beam is transmitted to the working surface to generate enough heat to melt the material. In addition, the high-pressure gas coaxial with the beam directly removes the molten metal, so as to achieve the purpose of cutting, which shows that the laser cutting processing is essentially different from the machining of machine tools. Because the intermittence of the high-pressure area will not interfere with the speed of light, the melting efficiency is also improved.