How to check the quality of metal laser cutting? See the following nine standards.
1. Roughness
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 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 lines, the higher the cutting quality.
2. Verticality
The perpendicularity of cutting edge is very important when the thickness of sheet metal exceeds 10mm. When away from the focus, the laser beam becomes divergent, and the cutting becomes wider toward the top or bottom according to the location of the focus. The cutting edge deviates from the vertical line by several millimeters. The more vertical the edge is, the higher the cutting quality is.
3. Cutting width
Generally speaking, the cutting width does not affect the cutting quality. Only when a particularly precise contour is formed inside the part can the cutting width have an important impact. This is because the cutting width determines the minimum internal diameter of the contour. When the plate thickness increases, the cutting width also increases. Therefore, in order to ensure the same high accuracy, no matter how wide the incision is, the workpiece in the processing area of the laser cutting machine should be constant.
4. Texture
When cutting thick plates at high speed, molten metal will not appear in the incision below the vertical laser beam, but will spray out at the back of the laser beam. As a result, bent 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.
5. Burrs
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 amount of burr can directly determine the quality of cutting.
6. Material deposition
Before the laser cutting machine starts to melt and perforate, it first touches a layer of special oily liquid on the surface of the workpiece. During the cutting process, due to gasification and various materials are not used, the customer blows the cut with wind, but the upward or downward discharge will also form deposits on the surface.
7. Depressions and corrosion
The depression and corrosion have adverse effects on the surface of the cutting edge and affect the appearance. They occur in cutting errors that should be avoided in general.
8. Heat affected area
In laser cutting, the area near the incision is heated. At the same time, the structure of metal changes. For example, some metals harden. The heat affected area refers to the depth of the area where the internal structure changes.
9. Deformation
If cutting causes sharp heating of the part, it will deform. This is particularly important in fine machining because the profile and connecting piece here are usually only a few tenths of a millimeter wide. Controlling the laser power and using short laser pulses can reduce the heating of components and avoid deformation.
