When laser cutting sheet metal parts, a lot of heat will be generated, and the heat will not be spread in time. In the processing of small holes, the metal laser cutting machine can be cooled on the outside of the hole. The small hole on the inside of the single hole is small because the heat can be diffused. The heat is too concentrated to cause excessive burning and slag. In addition, in the thick plate cutting, the molten metal accumulated on the surface of the material and the accumulation of heat can make the auxiliary air flow disorder and heat input too much, thus causing excessive burning, causing the phenomenon of burning edge.
So how to solve the problem of edge burning and slag hanging?
The solution for overburning when laser cutting carbon steel for small hole cutting. In the cutting of carbon steel with oxygen as the auxiliary gas, the key to solve the problem lies in how to restrain the production of oxidation heat. The method of auxiliary oxygen or delayed switching can be used to cut auxiliary air or nitrogen. This method can process small holes whose upper limit is 1/6 thick plate.
The pulse cutting condition of low frequency and high peak output power can reduce heat output and optimize cutting conditions. Setting the condition as a single pulse laser beam, high peak output and low frequency condition of high energy intensity can reduce the accumulation of molten metal on the surface of the material during the perforation and reduce the output of heat.
Solutions for laser cutting of aluminum alloy and stainless steel. The auxiliary gas used in the processing of such materials is nitrogen, which will not burn edges in cutting. However, due to the high temperature inside the small hole, the phenomenon of slag sticking in the inner side will be more frequent.
The solution to this problem is to increase the pressure of auxiliary gas. The conditions are set as high peak output and low frequency pulse conditions. When auxiliary gas is used in air, it will not burn as much as when nitrogen is used. However, it is easy to appear slag at the bottom. It is necessary to set the conditions for high auxiliary gas pressure, high peak output and low frequency pulse conditions.
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