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Some knowledge of laser cutting

When buying laser cutting machines, many people first consider how many w laser cutting machines can meet their needs, but in fact, when you deeply understand laser cutting, you can give yourself the answer.

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Today, Lei Yu Xiaobian will tell you the principle of laser cutting, cutting technology and thickness.

01 laser cutting principle

The basic principle of laser cutting is: gather the laser on the material, locally heat the material until it exceeds the melting point, and then blow the molten metal away with coaxial high-pressure gas or metal vapor pressure. With the relative linear movement between the beam and the material, the hole is continuously formed into a very narrow slit.

02 servo system

In the large format laser engraving machine , the processing height in different places is slightly different, resulting in the deviation of the material surface from the focal length. In this way, the size of the light spot gathered in different places is different, the power density is also different, and the laser cutting quality at different cutting positions is very inconsistent, which can not meet the quality requirements of laser cutting. The cutting head adopts a servo system, which can ensure that the height of the cutting head is consistent with the cutting material, so as to ensure the cutting effect.

03 auxiliary gas

Auxiliary gas suitable for the material to be cut must be added during the cutting process. In addition to blowing away the slag in the slit, the coaxial gas can also cool the surface of the processed object, reduce the heat affected zone, cool the focusing lens, and prevent smoke and dust from entering the lens seat to pollute the lens and cause the lens to overheat. The selection of gas pressure and type has a great influence on cutting. Common gases are: air, oxygen, nitrogen.

04 cutting process

The cutting process is related to the following factors: laser mode, laser power, focus position, nozzle height, nozzle diameter, auxiliary gas, auxiliary gas purity, auxiliary gas flow, auxiliary gas pressure, cutting speed, plate speed and plate surface quality.

It should be recognized that the accuracy of laser cutting machine is not only related to the equipment itself, but also related to external factors. When using the laser cutting machine, we should set and adjust the relevant parameters of the equipment according to the specific processing materials and the quality requirements of users, such as power, focus position, cutting speed, auxiliary gas, etc., in order to meet the product accuracy requirements of users.


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