For laser cutting, the evaluation of its processing quality mainly includes the following principles:

1. Smooth cutting, no stripe, no brittle fracture

When the metal laser cutting machine cuts thick plates at high speed, molten metal will not appear in the incision below the vertical laser beam, but will spray out at the rear of the laser beam. As a result, curved lines are formed at the cutting edge, and the lines closely follow the moving laser beam. To correct this problem, reducing the feed rate at the end of the cutting process can greatly eliminate the formation of lines.

2. The slit width is narrow, which is mainly related to the diameter of the laser beam spot

Generally speaking, the cutting width of metal laser cutting machine does not affect the cutting quality. The cutting width has an important impact only when a particularly precise contour is formed inside the part. This is because the cutting width determines the inner diameter of the contour. When the thickness of the plate increases, the cutting width also increases. Therefore, in order to ensure the same high accuracy, the workpiece in the processing area of the laser cutting machine should be constant regardless of the width of the cut.

3. Good perpendicularity of cutting seam and small heat affected zone

Generally, the metal laser cutting machine mainly focuses on the processing of materials below 5MM, and its section perpendicularity may not be the main evaluation factor, but for high-power laser cutting, when the thickness of the processed material exceeds 10mm, the perpendicularity of the cutting edge is very important. When away from the focus, the laser beam becomes divergent, and the cutting becomes wider towards the top or bottom according to the position of the focus. The cutting edge deviates several millimeters from the vertical line. The more vertical the edge is, the higher the cutting quality is.

4. No material combustion, no molten layer formation, no large slag

The slagging of metal laser numerical control cutting machine is mainly reflected in the deposition and section burr. The material deposition is due to a layer of special oil containing liquid on the surface of the workpiece before the laser cutting starts to melt and pierce. Gasified and various, the material does not need to be blown away by the customer, but the upward or downward discharge will also form deposits on the surface. The formation of burr is a very important factor that determines the quality of laser cutting. Because the removal of burr requires additional work, the severity and quantity of burr can directly determine the quality of cutting.

5. The cut surface is rough plated, and the size of surface roughness is the key to measure the surface quality of laser cutting

In fact, for the metal laser cutting machine, the cutting section grain and the roughness are directly related, and often the poor cutting performance of the section grain will directly lead to the high roughness. But considering the difference in the causes of the two different effects, we generally analyze the processing quality of the metal laser CNC cutting machine separately. The laser cutting section will form vertical lines. The depth of the lines determines the roughness of the cutting surface. The shallower the lines, the smoother the cutting section. Roughness not only affects the appearance of the edges, but also affects the friction characteristics. In most cases, it is necessary to reduce the roughness as much as possible, so the shallower the grain, the higher the cutting quality.

6. Heat effect of cutting material

As an application equipment of thermal cutting processing, metal laser cutting machine is bound to cause thermal impact on metal materials during use, which mainly includes three aspects: ① thermal impact area; ② Depression and corrosion; ③ Material deformation. The heat-affected area refers to the area near the incision heated during laser cutting. At the same time, the structure of the metal changes. For example, some metals will harden. The heat affected area refers to the depth of the area where the internal structure changes; However, depression and corrosion have adverse effects on the surface of the cutting edge and affect the appearance. They appear in the cutting error that should be avoided in general; Finally, if the cutting causes sharp heating of the part, it will deform. This is particularly important in fine machining, because the contour and connecting piece here are usually only a few tenths of a millimeter wide. Control of laser power and use of short laser pulses can reduce the heating of parts and avoid deformation.