What is overburning? Laser cutting machines generate a lot of heat when working sheet metal. Normally, the heat will spread inside the sheet metal along the cutting surface. Laser cutting machine in the small hole processing, the outside of the hole can be fully cooled, the small hole inside the hole part of the small diffusion space is small, the heat diffusion is not too concentrated and caused by overburning, hanging slag, etc. In addition, in thick plate cutting, the accumulation of molten metal on the surface during the perforation process and the high heat accumulation required for thick plate cutting can upset the auxiliary gases, resulting in increased heat, which can lead to overburning.
How to avoid overburning when laser cutting sheet metal? 1, add cooling point or use the ring cutting function in cutting with sharp corners of the plate, it is easy to overburn the position is often in the sharp corner, overburn will cut the sharp corner round, then you can add a cooling point at the sharp corner, stop at the sharp corner, blow air, can effectively avoid overburning phenomenon. Or the use of ring cutting function, at the sharp corner can avoid the slow speed caused by too much heat caused by overburning phenomenon.
2, the use of high power laser cutting carbon steel can use higher power laser, bright surface cutting process, can effectively avoid overburning, and this cutting process can cut out no burr, bright surface of the finished product. High power can effectively avoid overburning phenomenon.
3, using nitrogen cutting in sheet metal cutting with oxygen as an auxiliary gas, you can switch to using nitrogen to cut. When nitrogen is cut, the material is melted entirely by laser energy, and the nitrogen does not react easily with the sheet metal itself. The temperature of the melting point area is relatively low, coupled with the cooling and protective effect of nitrogen, the reaction is stable and uniform, and the cutting quality is high. The section is fine and smooth, the surface roughness is low, and no oxide layer.
4, increase the air pressure in the use of laser cutting machine processing aluminum alloy and stainless steel, the auxiliary gas is nitrogen or air, in the cutting will not occur burning, but because of the hole inside the material temperature is very high, the inner slag phenomenon will be more frequent. In this case, burrs and slag can be reduced by increasing the pressure of the auxiliary gas.
Post time: Mar-23-2023