For fiber laser cutting machine 6000w processing, the evaluation of its processing quality mainly includes the following principles:
1. Smooth cutting, no stripes, no brittle fracture;
2. The slit width is narrow, which is mainly related to the size of the laser beam spot diameter;
3. Good verticality of the slit and small heat affected zone;
4. No material combustion, no melting layer formation, no large slag;
5 notch surface roughness, the size of surface roughness is the key to measure the quality of laser cutting surface.
In addition to the above principles, the state and final forming of the molten layer in the process directly affect the above evaluation indexes of machining quality.
Laser cutting surface roughness mainly depends on the following three aspects:
1. The inherent parameters of the cutting system, such as spot mode, focal length, etc.;
2. Adjustable process parameters in the cutting process, such as power, cutting speed, auxiliary gas type and pressure, etc.;
3. Physical parameters of processed materials, such as laser absorption rate, melting point, viscosity coefficient of molten metal oxides, surface tension of metal oxides, etc.In addition, the thickness of the workpiece also has a great influence on the quality of the laser cutting surface.Relatively speaking, the smaller the thickness of the metal workpiece, the higher the roughness grade of the cutting surface.