1、 Working principle of laser cutting machine
The laser cutting machine requires a pressurized gas source as its power during operation. The commonly used auxiliary gases include oxygen, nitrogen, compressed air, and sometimes argon. According to gas pressure, it can be divided into high-pressure gas and low-pressure gas.
With the demand for the thickness and efficiency of cutting plates, the pressure of compressed air has also increased from 1.25 MPa to 1.3 MPa, and even reached 2.0 MPa to 3.0 MPa. Currently, 1.6 MPa compressed air is mainly used in the market.
2、 Influence of compressed air containing oil on laser cutting equipment
Compressed air can be provided directly with an air compressor, which is easier to obtain compared to oxygen and nitrogen, and is very cheap. Although the air contains only about 20% oxygen, and the cutting efficiency is far less than that of oxygen cutting, the cutting ability is close to that of nitrogen, and the efficiency of air cutting is slightly higher than that of nitrogen cutting. Using compressed air instead of nitrogen for cutting is an economical and practical option.
The quality of compressed air has a very direct impact on the quality of laser cutting. Compressed air contains water mist and oil. If it is not treated thoroughly and high-pressure sprayed onto the lens surface of the laser cutting head, it will seriously affect the transmission of the laser beam, disperse the focus, cause the product to become opaque and produce waste products. If it is a high-power laser cutting machine, as long as the surface of the protective mirror or nozzle is adhered with a tiny oil film or water mist, it may also cause high-energy laser emission to burn the laser head. Due to the fact that the price of laser heads for ultra high-power laser cutting machines is above 10000 yuan, and most compressed air cannot handle the oil and moisture in the compressed air very well. Even if new machines can meet this requirement, with the use of equipment, the effect of oil gas separation becomes worse, and the oil content in the compressed air will also become larger, bringing uncertainty to the use. Therefore, most users of high-power laser cutting machines are not willing to take the risk of using compressed air as an auxiliary gas.
3、 Obtaining oil-free compressed air
In compressed air, the removal of water is relatively easy. Only matching refrigerated dryers and filters need to be configured to meet the requirements. However, compressed air without oil is much more difficult. If you choose an oil free engine, it undoubtedly increases the purchase cost of users. In addition, it is difficult for an oil free engine to meet such high pressure.
"Oil free" compressed air is produced using a non oil free compressor, that is, using a conventional lubricated compressor to obtain compressed air, which is then processed by a rear end oil removal device to obtain oil free compressed air. ".
This configuration handles moisture and dust particles in the compressed air, and more importantly, purifies the gaseous oil in the compressed air to avoid contamination of the lens of the laser cutting equipment.
4、 Usage effect
This combination of micro-oil screw and purification device has good applications in some electronic, food, photovoltaic and other conditions that require no oil. After follow-up tracking in the use of matching laser cutting machines, the effect of use has also met customer expectations.
Any new product or technology is constantly developed and improved in practice, and the associated technologies must also keep pace with the times and adapt to new requirements.