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 burrs is a very important factor that determines the quality of laser cutting. Because the removal of burrs requires additional work, the severity and amount of burrs 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. It is gasified and various. The material does not need to be blown away by the customer with wind, but the upward or downward discharge will also form deposits on the surface.
7. Dents and corrosion. The depression and corrosion have adverse effects on the surface of the cutting edge and affect the appearance. They appear in cutting errors that should normally be avoided.
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 the 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.