The auxiliary processing gases of metal CNC fiber laser cutting machine are air, oxygen and nitrogen. Each gas has suitable metal cutting materials, and the metal CNC fiber laser cutting machine improves the cutting quality by injecting auxiliary gas. This is the case with some fine CNC plasma cutting machine. Today, Jinan Rebound CNC Machine Co., Ltd. mainly introduces the influence of air as an auxiliary cutting gas on metal CNC fiber laser cutting machine.

Scope of use of air as auxiliary gas

01. Carbon steel plate/Q235 plate

When using air as an auxiliary gas for cutting, after the thickness of the plate exceeds 1.5mm, a certain burr will be generated on the cutting section, but the generated burr is not sharp, and the paper will not be scratched during the scratch test. For different power and different types of vibrators, the maximum thickness that air can cut as an auxiliary gas varies.

02. Stainless steel plate/SUS304 plate

When air is used as an auxiliary gas for cutting, a yellow oxide layer will be produced on the cut section.

03. Aluminum plate/A1050 plate and aluminum alloy plate/5052 plate

When cutting with air as the auxiliary gas, the cutting burr will be reduced compared to nitrogen.

The effect of air as auxiliary gas on cutting

01. For carbon steel plate

When air is used as an auxiliary gas for cutting, the section of the part will produce small burrs, but the burrs are not sharp and can be applied to parts that do not require high burrs.

02. For stainless steel plate

Because air is used as an auxiliary gas, the cutting surface of the material will be oxidized after being processed by the metal CNC fiber laser cutting machine, which will cause the oxide to produce defects such as slag inclusions and pores in the weld bead during the welding of the cut section, which will affect the quality of the weld and lead to The strength of the welded part decreases. Therefore, when using air as an auxiliary gas to complete the cutting of parts and then welding them, it is necessary to grind the oxide layer on the cross-section of the welded part to improve the welding quality. In addition, the section will be oxidized after cutting, resulting in a yellow oxide layer, which will have an impact if the part is an appearance part. The oxide layer also affects welding, and the oxide layer must be polished before welding.

03. For aluminum plate and aluminum alloy plate

Using air as the auxiliary gas can reduce the cutting burr. If nitrogen is used, the cutting burr will be larger.

Requirements for air supply device with air as auxiliary gas

When using air as an auxiliary gas for cutting, the air pressure needs to be 0.9MPa. Considering the pressure level of the air compressor produced by the manufacturer, a screw air compressor with a rated working pressure of 1.26MPa and a flow rate of 2.3m3/min should be selected. Special attention should also be paid to the quality of compressed air, to ensure that the dryness of the air reaches 99% and the moisture content is less than 1/100. Therefore, the filter elements in the compressed air pipeline must use reliable quality brand products, and pay special attention to replacing the filter element in time; at the same time, when choosing a dryer, because there are currently two types of regenerative adsorption dryers and refrigerated dryers on the market These two types of dryers have their own characteristics, but if the requirements of long time, less maintenance and air supply stability are considered, it is recommended to choose a regenerative adsorption dryer. Finally, when selecting the diameter of the compressed air pipeline and the pressure reducer, the flow and pressure of the output gas of the compressor must be satisfied, so as to ensure the stability of the pressure when using compressed air. In addition, the permanent magnet variable frequency screw air compressor has been sold in the market. Compared with the current non-variable screw air compressor, this air compressor can save up to 50% of electricity, which can further reduce the cutting of metal CNC fiber laser cutting machine. cost.