Laser cutting technology is an important technology in the field of laser processing. Judging the cutting quality of laser cutting machine is the best way to judge the performance of laser cutting equipment intuitively. How to judge the cutting quality of laser cutting machine and what are the criteria for judging the cutting quality of laser cutting machine?
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 the edge, but also affects the friction characteristics. In most cases, the roughness needs to be reduced as much as possible, so the shallower the texture, the higher the cutting quality.
2. Perpendicularity
How the thickness of sheet metal 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 toward the top or bottom according to the position of the focus. The cutting edge deviates from the vertical line by several millimeters. The more vertical the edge, the higher the cutting quality.
3. Cutting width and notch width
Generally speaking, the cutting quality is not affected. Only when a particularly precise profile is formed inside the part, the cutting width has an important impact. This is because the cutting width determines the minimum internal diameter of the profile. When the thickness of the plate increases, the cutting width also increases. Therefore, in order to ensure the same high accuracy, the workpiece should be constant in the processing area of the laser cutting machine no matter how large the incision width is.
4. Grain
When cutting thick plates at high speed, molten metal will not appear in the notch under the vertical laser beam, but will be sprayed out at the back of the laser beam. As a result, curved lines are formed on the cutting edge, and the lines closely follow the moving laser beam. In order to correct this problem, reduce the feed rate at the end of the cutting process, which can greatly eliminate the formation of lines.
5. Burr
The formation of burr is a very important factor that determines the quality of laser cutting. Because the removal of burr requires extra work, the severity and quantity 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 piercing. Gasified and various, the material does not need to be blown by the customer to remove the cut, but it will also form deposits on the surface when discharged upward or downward.
7. Dent and corrosion
Dents and corrosion adversely affect 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 along the vicinity of the incision is heated. At the same time, the structure of the metal changes. For example, some metals may harden. The heat affected area refers to the depth of the area where the internal structure changes.