With the increasingly fierce competition in the laser pen processing industry, how to improve efficiency and reduce costs has become a concern of most users. The fiber laser cutting machine has the advantages of fast cutting speed, small material deformation and high processing precision, and has become the mainstream of the market. The application of high power lasers greatly improves the efficiency of laser processing. The extreme cutting speed of the thin plate has been able to challenge the control limit of mechanical properties, and the cutting process of the medium and heavy plate is also constantly breaking.
The above table shows the speed comparison of stainless steel nitrogen cuts for different power laser pointer cutters. It can be seen that for stainless steel cutting, the higher the laser power, the faster the cutting speed.
The cutting aid gases commonly used in fiber laser cutting machines are oxygen, nitrogen and air. However, since the cost of nitrogen and oxygen is higher than the cost 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.
Oxygen is mainly used for carbon steel cutting. The principle is that oxygen reacts with the metal to release a large amount of heat of oxidation. At the same time, a certain pressure will blow out oxides and slag from the reaction zone, thereby forming a gap in the metal. Since the oxidation reaction occurring during the laser pen cutting process generates a large amount of heat, much electric energy is not required, but the sharp corners are easily overheated.
Nitrogen is mainly used to cut stainless steel and aluminum plates, and it can also cut carbon steel plates of a certain thickness. The higher the power, the greater the thickness of the carbon steel that can be cut. Nitrogen cutting relies on the energy of the laser to melt the metal, blowing away the melt under high pressure and ensuring that unreasonable chemical reactions are avoided during this period. In stainless steel and aluminum sheet cutting, a relatively bright cross-section effect can be obtained with a sharper corner effect.
The air itself is present in the atmosphere, compressed into a gas storage tank by an air compressor, then filtered, cooled and dried to remove water and oil from the air. The principle of air cutting is similar to that of nitrogen, but because the air contains about 20% oxygen, it can compensate for the deficiency of oxygen and nitrogen to some extent.
From top to bottom: 12mm stainless steel nitrogen cutting section, 12mm stainless steel air cutting section, 12mm stainless steel air cutting and polishing section. Compared to nitrogen cutting, the air cutting section is darker but does not slag. After polishing, this part can also achieve a brighter effect.