Laser cutting of sheet metal parts will produce a lot of heat, which is not diffused in time, resulting in edge burning. In the processing of small holes by fiber laser cutting machine, the outside of the hole can be cooled, but the small hole on the inside of the hole has a small space for heat diffusion, and the heat is too concentrated, resulting in overburning, slag hanging, etc. In addition, in thick plate cutting, the molten metal accumulated on the surface of the material during perforation and the heat accumulation will make the auxiliary air flow disordered and the heat input too much, resulting in over burning and edge burning.
Fiber laser cutting machine
1、 Solution to overburning during carbon steel processing:
In carbon steel cutting with oxygen as auxiliary gas, the key to solve the problem is how to prevent the generation of oxidation reaction heat. The method of auxiliary oxygen during perforation and then switching to auxiliary air or nitrogen for cutting can be adopted. This method can process small holes in 1/6 thick plates. The pulse cutting condition with low frequency and high peak output power can reduce the heat output, which is conducive to the optimization of cutting conditions. Setting the conditions as single pulse laser beam, high peak output of energy intensity and low frequency conditions can reduce the accumulation of molten metal on the material surface and reduce the output of heat during the perforation process.
2、 Solutions for processing aluminum alloy and stainless steel with fiber laser cutting machine:
In the processing of such materials, the auxiliary gas used is nitrogen, and edge burning will not occur in the cutting. However, due to the high temperature of the material inside the small hole, the phenomenon of slag hanging inside is also relatively frequent. The solution: increase the pressure of the auxiliary gas, and set the condition to the pulse condition of high peak output and low frequency. When using air for auxiliary gas, as when using nitrogen, overburning will not occur, but slag is easy to appear at the bottom. It is necessary to set the conditions as high auxiliary gas pressure, high peak output and low-frequency pulse conditions.