Since the cost of nitrogen and oxygen is higher than that of compressed air, and the price of nitrogen and oxygen rises year by year, the use of air as a cutting aid gas can greatly reduce the production cost, and the range is about -half. In addition, since the air itself contains about 20% of oxygen, it can compensate for the deficiency of oxygen and nitrogen to some extent. It is very economical and practical to use compressed air instead of nitrogen cutting, which is saved in one year.
At the cost of gas, it is enough to buy 3 high-quality laser-specific integrated air compressors. Therefore, the use of compressed air as an auxiliary gas cutting is becoming more and more common, which has also led to the rise of the market for laser cutting special air compressors.
The choice of the size of the air compressor supporting the calender cutting machine as the auxiliary gas should be determined according to the design of the laser cutting head used in the laser cutting machine to assist the gas pressure and the nozzle size, so that the best air compressor can be obtained. Matches with the laser cutter. At present, laser cutting machines that require compressed air of 1.6 MPa or more mainly use piston compressors, but the development of piston compressors is relatively slow due to the reliability and quality constraints. Piston air compressors are relatively easy to obtain high pressure, but piston air compressors are noisy, have a lot of wearing parts, and do not handle oil wells. Therefore, piston air compressors are not recommended below 1.6MPa. Below 1.6MPa, it is generally recommended to use a screw air compressor, and then choose a suitable cold dryer and precision filter.
The compressor should be a permanent magnet variable frequency motor, which can keep the pressure supply stable and ensure the best cutting effect.
With the development of laser cutting machine power from low power to medium power to high power and super power, the pressure requirements of air compressors for laser cutting machines have increased from the initial 8 bar to 13 bar two years ago. The 16bar is still growing further towards 20~30bar. Therefore, it is necessary to develop a small-flow high-pressure screw air compressor with a rated discharge pressure of 2.0 MPa.
Compressed air quality has a very direct impact on the quality of metal laser cutting. The size and stability of the gas pressure will affect the cutting effect. Laser cutting machine users are generally equipped with four-stage filtration or even five-stage filtration, in order to better protect the service life of the laser cutting machine.