Standard for measuring the quality of laser cutting machines
The laser cutter focuses the laser light emitted from the laser into a high power density laser beam through the optical path system. The laser beam is irradiated onto the surface of the workpiece to bring the workpiece to a melting point or boiling point, while the high-pressure gas coaxial with the beam blows away the molten or vaporized metal. The roughness laser cutting section forms vertical grains, and the depth of the grains determines the roughness of the cutting surface. The shallower the grain, the smoother the cutting section. Roughness not only affects the appearance of the edges, but also affects the friction characteristics. In most cases, the roughness must be minimized, so the shallower the grain, the higher the cutting quality.
2. Verticality. Sheet thickness exceeds 10
When mm is used, the perpendicularity of the cutting edge is very important. When away from the focus, the laser beam becomes divergent and the cut widens to the top or bottom depending on the position of the focus. The cutting edge differs from the vertical by a few millimeters, and the higher the edge perpendicularity, the higher the cutting quality.
3. Cutting width The cutting width generally does not affect the cutting quality. The cutting width will only have an important effect when a particularly precise contour is formed inside the part, because the cutting width determines the minimum internal longitude of the contour, and when the thickness of the sheet increases, the cutting The width will also increase. Therefore, in order to ensure the same high precision, the workpiece should be constant in the processing area of the laser cutting machine regardless of the gap width.
4. Lines. When the slab is cut at a high speed, molten metal does not appear in the slit below the vertical laser beam, but is ejected on the back side of the laser beam. As a result, curves are formed at the cutting edges, and these curves closely follow the moving laser beam. To correct this problem, reducing the feed rate at the end of the cut can greatly eliminate the formation of lines.
5. Glitch. A fiber laser cutting machine uses a fiber laser generator as a light source for a laser cutting machine. The fiber laser is a new type of fiber laser that is newly developed in the world to output a high energy density laser beam, which is concentrated on the surface of the workpiece, so that the area irradiated by the ultrafine focus spot on the workpiece is instantly melted and vaporized, and the spot is moved by the numerical control mechanical system. Automatic cutting is achieved by illuminating the position. The formation of burrs is a very important factor in determining the quality of laser cutting, because the removal of burrs requires extra work, so the severity and quantity of burrs can be visually judged.
6. Material Deposition The laser cutting machine encounters a special layer of oily liquid on the surface of the workpiece and then begins to melt and stamp. During the cutting process, customers use wind to remove the cuts due to gasification and the use of various materials, but the upward or downward discharge also forms deposits on the surface.
7. Depression and corrosion. Indentation and corrosion can adversely affect the surface of the cutting edge and affect its appearance. They appear in cutting errors that should normally be avoided.
8. Heat affected zone In the laser cutting, the area near the slit is heated. At the same time, the structure of the metal has also changed. For example, some metals will harden. The heat affected zone refers to the depth of the area where the internal structure changes.
9. Deformation If the part is sharply heated by cutting, it will be deformed. The laser cutter focuses the laser light emitted from the laser into a high power density laser beam through the optical path system. The laser beam is irradiated onto the surface of the workpiece to bring the workpiece to a melting point or boiling point, while the high-pressure gas coaxial with the beam blows away the molten or vaporized metal. This is especially important in precision machining because the contours and connectors are typically only a few tenths of a millimeter wide. Controlling laser power and using short laser pulses can reduce part heating and avoid distortion.