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How to choose auxiliary gas for laser cutting machine equipment?

Views:2     Author:heyu     Publish Time: 2020-05-21      Origin:Leapion fiber laser cutting machine

How to choose auxiliary gas for laser cutting machine equipment?

The laser cutting machine needs to be equipped with auxiliary gas, mainly oxygen, nitrogen and air. When processing the workpiece, the fiber laser cutting machine will be irradiated by the laser focus spot, the irradiated area will be melted and vaporized instantaneously, and then the spot irradiation position will be moved by the CNC equipment system to realize automatic cutting.

1. Compressed air.

Air is suitable for cutting aluminum plates and galvanized steel plates. To a certain extent, it can reduce oxide films and save costs. Generally, it is used when the cutting plate is relatively thick and the requirements on the cutting end surface are not too high.

2. Nitrogen.

Nitrogen is an inert gas, which prevents oxidation of the cutting end of the product when cutting and prevents burning (it is easy to occur when the sheet is thick. Nitrogen can be selected for products that require high cutting end and are not exposed to the outside.

3, oxygen.

It acts as a combustion aid, it can increase the speed and thickness of the cutting. Oxygen is suitable for thick plate cutting, high speed cutting and thin plate cutting, such as some large carbon steel plates and some thick carbon steel plate structural parts. Oxygen can be used. Increasing the gas pressure can increase the cutting speed, but after reaching a set value, continuing to increase the gas pressure will cause the cutting speed to decrease.

At high auxiliary gas pressure, the reason for the reduction in cutting speed can be attributed to the high In addition to the enhancement of the cooling effect of the airflow and the effect area, the intermittent shock wave in the airflow may interfere with the cooling of the laser area. The uneven pressure and temperature in the airflow will cause changes in the airflow field density.

Such a density gradient causes the refractive index in the field to change, which Focusing, causing refocusing or beam divergence. This interference will affect the melting efficiency, and may sometimes change the mode structure, resulting in a decrease in cutting quality. If the beam diverges too much, making the light spot too large may even cause serious consequences that the cutting cannot be performed effectively.

Application of auxiliary gas:

1. Compressed air: It is widely used in the processing of some sheet metal chassis cabinets and other products.

2. Nitrogen: processing of some decorative industries, aerospace and other parts;

The laser cutting machine uses different auxiliary gas to cut different materials. The pressure and required flow rate of the auxiliary gas vary with the thickness of the cutting material.

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The data are for reference only


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