The so-called heat-affected region refers to the region heated along the laser incision in the process, leading to a certain change in the structure of the metal, which will lead to the hardening of the metal.
The presence of heat affected area is unfavorable for laser cutting, especially for the surface and edge smoothness of sheet metal.
In addition to metal hardening, the heat affected area will also lead to metal edge sag and corrosion, which may lead to errors in the actual processing.
As for laser cutting machine, especially in the process of precision machining, subtle changes will lead to errors in the precision of sheet metal parts, directly affecting the processing quality.
Laser cutting surface roughness mainly depends on the following three aspects:
(1) natural parameters of the cutting system, such as spot mode, focal length, etc.;
(2) cutting process adjustable process parameters, such as power, cutting speed, auxiliary gas type and pressure, etc.;
(3) processing material physical parameters, such as the laser absorption rate, melting point, melt metal oxide viscosity coefficient, metal oxide surface tension.
In addition, the thickness of the workpiece also has a great impact on the surface quality of laser cutting.
Relatively speaking, the smaller the thickness of the metal workpiece, the higher the roughness level of the cutting surface, so choosing an appropriate laser cutting machine has a positive role in promoting the production efficiency.