Judging the cutting quality of the laser cutting machine is the most intuitive way to determine the performance of the laser cutting equipment. Here, the special magnesium laser lists some of the nine criteria for determination.
1. Roughness. Laser cutting section will form vertical lines, the depth of the lines determines the roughness of the cutting surface, the more shallow 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.
2. Perpendicularity. How the thickness of the sheet metal exceeds 10mm, the verticality of the cutting edge is very important. Moving away from the focal point, the laser beam becomes divergent, and the cut widens toward the top or bottom, depending on the location of the focal point. The cutting edge deviates from the vertical line by a few millimeters. The more vertical the edge, the higher the cutting quality.
3. Cutting width. The width of the cut generally does not affect the quality of the cut, and 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 inner diameter of the contour, and when the thickness of the plate increases, the cutting width also increases. So want to ensure the same high precision, regardless of the width of the cut, the workpiece in the laser cutting machine processing area should be constant.
4. Textures. When cutting thick plates at high speed, the molten metal will not appear in the incision below the vertical laser beam, but will be ejected at the rear of the laser beam. As a result, a curved line is formed at the cutting edge, and the line closely follows the moving laser beam. In order to correct this problem, the feed rate is reduced at the end of the cutting process, which can greatly eliminate the line formation of the line.
5. Burr. The formation of burrs is a very important factor in determining the quality of laser cutting. Because the removal of burrs requires additional work, the severity and amount of burrs can intuitively judge the quality of cutting.
6. Material deposition. The laser cutting machine touches a special oil-containing liquid on the surface of the workpiece before starting to melt the perforation. Gasified and various, the material does not need to be blown off by the customer with wind, but discharged upward or downward will also form deposits on the surface.
7. Dents and corrosion. Dents and corrosion adversely affect the surface of the cut edge, affecting the appearance. They appear in cutting errors that should generally be avoided.
8. Heat-affected zone | In laser cutting, the area along the vicinity of the cut is heated. At the same time, the structure of the metal changes. For example, some metals can harden. The heat affected zone refers to the depth of the area where the internal structure changes.
9. Deformation, if the cutting makes the part heat up sharply, it will deform. This is particularly important in fine machining, since the contours and webs here are usually only a few tenths of a millimeter wide. Controlling the laser power and using short laser pulses can reduce component heating and avoid distortion.