The so-called heat-affected zone means that during the processing, it is heated along the area near the laser cut, resulting in a certain change in the structure of the metal, which causes the metal to harden. The presence of heat-affected areas is disadvantageous for laser cutting, especially for the smoothness of the surface of the sheet metal and the edge. In addition to causing hardening of the metal, the heat-affected zone may cause dents and corrosion on the edge of the metal, which may cause errors in the actual processing. For the laser cutting machine, especially in the precision machining process, the slight change will lead to the error of the precision of the sheet metal part, which directly affects the processing quality.
What factors affect the accuracy of the laser cutting machine?
Laser cutting surface roughness mainly depends on the following three aspects:
1 inherent parameters of the cutting system, such as spot mode, focal length, etc.;
2 adjustable process parameters during the cutting process, such as power size, cutting speed, auxiliary gas type and pressure;
3 physical properties of the processing materials, such as the absorption rate of the laser, the melting point, the viscosity coefficient of the molten metal oxide, the surface tension of the metal oxide, and the like.
In addition, the thickness of the workpiece also has a large effect on the quality of the laser cut surface. Relatively speaking, the smaller the thickness of the metal workpiece, the higher the roughness level of the cutting surface, so choosing a suitable laser cutting machine has a positive effect on improving production efficiency.
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