Testing standard for cutting quality of laser cutting machine
March 22, 2022
The quality of laser cutting machine mainly depends on its cutting quality, which is the most direct way to test the quality of equipment. For new customers, when purchasing equipment, they will be required to see the laser cutting machine proofing first. In addition to the cutting speed of the equipment, proofing depends on the cutting quality of the sample. How to see the cutting quality and what aspects should be paid attention to? Let's give you a detailed introduction. The following nine standards are indispensable.
The laser cutting section will form vertical lines, and 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 edge, 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.
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 towards the top or bottom according to the position of the focus. The cutting edge deviates from the vertical line by a few percent. The more vertical the edge is, the higher the cutting quality is.
3. Cutting width
Generally speaking, the notch width does not affect the cutting quality. Only when a particularly precise contour is formed inside the part, the cutting width has an important impact, 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 precision, no matter how large the notch width is, the workpiece should be constant in the processing area of the laser cutting machine.
When cutting thick plates at high speed, molten metal will not appear in the notch below the vertical laser beam, but will spray out at the back of the laser beam. As a result, the curved lines are formed at the cutting edge, and the lines closely follow the moving laser beam. In order to correct this problem, reducing the feed rate at the end of the cutting process can greatly eliminate the formation of lines.
Burr formation is a very important factor that determines the quality of laser cutting. Because burr removal requires additional workload, the severity and amount of burr can directly judge the quality of cutting.
6. Material deposition
The laser cutting machine touches a layer of special liquid containing oil on the surface of the workpiece before melting and perforation. During the cutting process, due to gasification and various materials are not used, the customer uses the wind to blow away the incision, but the upward or downward discharge will also form deposition on the surface.
7. Depression and corrosion
Depression and corrosion have an adverse effect 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
The laser is heated along the cut area. At the same time, the structure of the metal changes. For example, some metals harden. The heat affected area refers to the depth of the area where the internal structure changes.
If cutting causes the part to heat up sharply, it will deform. This is particularly important in fine machining because the contours and connecting pieces are usually only a few tenths of a millimeter wide. Controlling laser power and using short laser pulses can reduce component heating and avoid deformation