The metal laser cutting machine will generate a lot of heat when processing sheet metal. Under normal circumstances, the heat generated by cutting will diffuse along the kerf into the processed sheet metal to be fully cooled. In the processing of small holes in the metal laser cutting machine, the outside of the hole can be sufficiently cooled, but the small hole inside the single hole is likely to cause overburning, slagging, etc. because of the small space for heat diffusion and excessive heat energy. In addition, in the cutting of thick plates, the molten metal accumulated on the surface of the material and the heat accumulation generated during the piercing will cause the auxiliary airflow to be turbulent, and the heat input will be too much, which will cause overburning.
How to avoid overburn when laser cutting sheet metal?
1. Corner position plus cooling point
When cutting sharp-corner metal sheets, the location where overburning is more likely to occur is often at the sharp corners. Overburning will cut the sharp corners into a round shape. At this time, add a cooling point at the sharp corners and stop at the sharp corners. Click, blow.
2. Use high power laser
When cutting carbon steel, a higher power laser can be used. The bright surface cutting process can effectively avoid over-burning, and this cutting process can cut finished products with no burrs and bright cut surfaces.
3. Cutting with nitrogen
In sheet metal cutting with oxygen as the auxiliary gas, nitrogen can be used for cutting. When nitrogen cutting, the material completely relies on laser energy to melt, and nitrogen blows out the slit and avoids inappropriate chemical reactions. The temperature in the melting point area is relatively low, coupled with the cooling and protection of nitrogen, the response is stable and uniform, and the cutting quality is high. The section is fine and smooth, the surface roughness is low, and there is no oxide layer.
4. Increase the air pressure
When the fiber laser cutting machine is used to process aluminum alloy and stainless steel, the auxiliary gas used is nitrogen or air. There will be no burnt edges during the cutting process. However, due to the high temperature of the material inside the small hole, the slagging phenomenon on the inside will be reduced. More frequently. In this case, burrs and dross can be reduced by increasing the pressure of the auxiliary gas.
The above is how to avoid the overburn phenomenon during laser cutting. More knowledge will continue to be updated for you.