During the laser segmentation process, the pressure of the assist gas has a large effect 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, and the high-pressure gas coaxial with the beam directly removes the molten metal, thereby achieving the purpose of cutting. It shows that the laser cutting process is essentially different from the machining of the machine tool. Laser cutting machine The so-called laser cutting is the energy released when the laser beam is irradiated onto the surface of the workpiece to melt and evaporate the workpiece to achieve the purpose of cutting and engraving. It has high precision, fast cutting, not limited to cutting pattern limitation, and automatic typesetting saving. Materials, smooth cuts, low processing costs, etc., will gradually improve or replace the traditional metal cutting process equipment. The auxiliary gas must have sufficient pressure to completely remove the waste generated by the splitting. Generally, the air pressure is reduced a little when the thicker workpiece is divided, and the residue stuck to the workpiece will break the dividing edge.
Increasing the gas pressure can divide the speed in advance, but after reaching a maximum value, continuing to increase the gas pressure will cause a decrease in the dividing 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, and the high-pressure gas coaxial with the beam directly removes the molten metal, thereby achieving the purpose of cutting. It shows that the laser cutting process is essentially different from the machining of the machine tool. Laser cutting machine The so-called laser cutting is the energy released when the laser beam is irradiated onto the surface of the workpiece to melt and evaporate the workpiece to achieve the purpose of cutting and engraving. It has high precision, fast cutting, not limited to cutting pattern limitation, and automatic typesetting saving. Materials, smooth cuts, low processing costs, etc., will gradually improve or replace the traditional metal cutting process equipment. Under the high auxiliary gas pressure, the reason for the decrease of the cutting speed can be attributed to the high airflow speed and the enhancement of the cooling effect of the hanging action zone, and may also be the interference of the intermittent shock wave existing in the airflow to the cooling of the laser action zone. Uneven pressure and temperature in the gas stream can cause changes in the airflow field density. Such a density gradient causes a change in the index of refraction in the field, thereby focusing the focus of the beam energy, causing refocusing or beam divergence. This interference can affect the efficiency of the melting, and sometimes it can change the mode structure, resulting in a drop in the quality of the cut if the beam diverges too much. To make the spot too large can even cause serious consequences of not being able to cut effectively.
In order to avoid the adverse reaction of the high-speed airflow to the splitting performance, it is conceivable to change the total pressure distribution in the gas flow. Due to this change in the gas pressure distribution, the melting process takes place in the central low-pressure zone; and the adjacent high-pressure zone around it can be increased to Sufficient momentum 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, and the high-pressure gas coaxial with the beam directly removes the molten metal, thereby achieving the purpose of cutting. It shows that the laser cutting process is essentially different from the machining of the machine tool. Since the intermittent nature of the high pressure zone does not interfere with the speed of light, the melting efficiency is also improved.