We may encounter burning edge problem when using metal laser cutting machine in processing. Do you know why this occurs and how to solve it?

Metal laser cutting machines generate a lot of heat when processing sheet metal. Under normal circumstances, the heat generated by cutting will spread along the slit into the processed sheet metal to be cooled. In the processing of the small hole of the metal laser cutting machine, the outside of the hole can be cooled, and the small hole portion inside the single hole is small in space due to heat diffusion, and the energy is too concentrated to cause overburning and drossing. In addition, in the slab cutting, the molten metal accumulated on the surface of the material and the accumulation of heat generated during the perforation may cause the auxiliary airflow to be disordered and the heat input to be excessive, thereby causing overburning.

Solution:

1. Solution for over-burningproblem of metal laser cutting machine in the cutting of carbon steel holes: In the cutting of carbon steel with oxygen as the auxiliary gas, the key to solving the problem is how to prevent the heat of oxidation reaction. A method of assisting oxygen during perforation and switching to assist air or nitrogen for cutting may be employed. This method can process small holes in 1/6 thick plates. Pulse cutting conditions with low frequency and high peak output power have the feature of reducing heat output and contributing to optimization of cutting conditions. The condition is set to a single-pulse laser beam, a high peak output with high energy intensity, and a low frequency condition, which can reduce the accumulation of molten metal on the surface of the material during the perforation process and reduce the heat output.

2. Solution of metal laser cutting machine in aluminum alloy and stainless steel cutting: In the processing of such materials, the auxiliary gas used is nitrogen, no burning edge occurs during cutting, but the temperature of the material inside the small hole very high, the internal slag phenomenon will be more frequent. The solution is to increase the pressure of the auxiliary gas and set the condition to a high peak output, low frequency pulse condition. The auxiliary gas uses air as well as when nitrogen is used. It does not burn too much, but it is easy to slag at the bottom. It is necessary to set the conditions to high auxiliary gas pressure, high peak output, and low frequency pulse conditions.