Views: 39 Author: Site Editor Publish Time: 01-20-2022 Origin: Site
Nowadays, laser cutting machine has occupied the position of mainstream equipment in the market with its advantages of high cutting precision, narrow slit, smooth cutting surface and high efficiency. But sometimes the cutting efficiency and effect are not very good. At this time, we need to optimize the cutting process parameters of the laser cutting machine. Please see the analysis of Leapion laser below.
The selection and determination of laser cutting process parameters is the focus of the laser processing process. If the selection of process parameters is not good, the laser cutting effect will be seriously affected.
Laser power
cutting speed
focus position
Nozzle and Nozzle Height
pressure of auxiliary gas
There is an adjustable range for laser power, cutting speed, auxiliary gas pressure and defocus amount. And these undetermined parameters are not isolated, they are closely related to each other and to known parameters.
Fast cutting speed is one of the advantages of laser cutting machines, but the cutting speed is not as fast as possible. In the case of a certain laser power, it is necessary to select the appropriate cutting speed according to the cutting plate, so as to make the cutting surface beautiful and obtain high quality. For cutting workpieces, the following methods can be used to judge whether the cutting speed is appropriate, and then adjust the cutting speed:
1) Observe the cutting sparks
When the cutting speed is appropriate, the cutting sparks spread evenly from top to bottom;
When the cutting speed is too fast, the cutting spark will be inclined;
When the cutting speed is too slow, the cutting sparks gather together, do not spread and are small.
2) Observe the cut sheet
When the cutting speed is appropriate, the cutting surface presents a relatively smooth line, and no slag is produced in the lower half. When the cutting speed is too fast, it may not be able to be cut through, and the sparks will spray randomly; some areas can be cut through, but some areas cannot be cut through; the cutting section is slanted, and the lower part produces slag.
When the cutting speed is too slow, it will cause over-melting, the cutting section will be rough, and the kerf will become wider.
When cutting, the height of the nozzle is generally set at 0.3mm-0.8mm. If it is too low, the nozzle will easily collide with the surface of the workpiece. If it is too high, the concentration and pressure of the auxiliary gas will be reduced, resulting in a decrease in the cutting quality.
When perforating, in order to prevent the generated slag from falling back on the lens, the height of the nozzle can be appropriately raised.
We have shared the impact of the nozzle on the cutting effect in detail before. Interested friends can check it directly. I will not go into details here.
When laser cutting, the change of the defocus amount has a direct effect on the slit width. When the defocus amount Z=0, the slit width is the smallest, and the slit width will become wider whether the focus position is moved up or down.
Under a certain plate thickness and cutting power, there is an optimal range of defocusing amount. When the defocusing amount is within this range, the slit width is small and stable, and the cutting quality is high.
Earlier, we shared in detail the 3 focal positions in the laser cutting process, you can search and view directly.
1) Insufficient air pressure
When the gas pressure is insufficient, the slag produced by cutting cannot be removed, and it is not easy to penetrate, resulting in slag on the cutting surface; the cutting speed cannot be increased, which affects the cutting efficiency.
In general, when cutting thin plates at high speed, high air pressure is required to prevent slag from attaching to the back of the slit; when the material is thicker or the cutting speed is slow, the air pressure can be appropriately reduced.
2) The air pressure is too high
Increasing the gas pressure can improve the cutting speed to a certain extent, but excessive air pressure will actually reduce the cutting speed. This is because under high pressure, the excessively fast gas flow will enhance the cooling effect, and even interfere with the focusing of the beam energy, resulting in a decrease in cutting quality and efficiency.
At the same time, when the air pressure is too high, the cutting surface will be thicker and the kerf will be wider.
The above is a method for optimizing the main parameters that affect the quality of laser cutting. In actual laser cutting, there are many parameters that affect the quality of laser cutting.
For more information and content inquiries about laser cutting machines, please contact Leapion Laser directly.
