The Importance Of Air Pressure in The Operation Of Laser Cutting Machines
Many people may not know that when the laser cutting machine is in operation, the pressure of its auxiliary gas will have a great impact on the cutting quality of the equipment, which causes many people to ignore this effect, and the cutting quality of the equipment is always problematic. So the following editor will talk about the importance of the air pressure to the equipment.
The auxiliary gas must have enough pressure to be able to remove the waste generated by laser cutting. Generally, when cutting thicker workpieces, the air pressure should be reduced a bit. The residues sticking to the workpiece will damage the cutting edge.
Increasing the gas pressure of the laser cutting machine can increase the laser cutting speed, but after reaching a certain value, continuing to increase the gas pressure will cause the cutting speed to drop. Under high auxiliary gas pressure, the reason for the decrease in cutting speed can be attributed to the high air velocity and the enhancement of the cooling effect of the action area, and it may also be the interference of the intermittent shock wave existing in the airflow on the cooling of the laser action area. The uneven pressure and temperature in the airflow will cause changes in the density of the airflow field. Such a density gradient results in a change in the refractive index in the field, thereby constricting the focus of the beam energy, causing refocusing or beam divergence. This interference will affect the melting efficiency, and sometimes may change the mode structure, resulting in a decrease in cutting quality, if the beam diverges too much. To make the light spot too large may even cause serious consequences that cannot be effectively cut.
In order to avoid the adverse reaction of the high-speed airflow to the cutting performance of the laser cutting machine, it is conceivable to change the total pressure distribution in the airflow. Due to this change in the airflow pressure distribution, the melting process takes place in the central low-pressure zone; and the adjacent high-pressure zone around it It can be increased to sufficient momentum (impulsive force) to ensure more effective removal of slag. Since the intermittent nature of the high-pressure zone will not interfere with the speed of light, the melting efficiency is also improved.
So when you use a laser cutting machine, you must pay more attention to the influence of air pressure, so as to better improve the cutting quality of the equipment.
