The quality of a laser cutting machine depends on its cutting quality. This is the most direct way to check the quality of the equipment. For new customers, when purchasing equipment, they will be required to look at the laser cutting machine for proofing. In addition to proofing the cutting speed of the equipment, that is to see the cutting quality of the sample, so how to look at the cutting quality, what aspects should be paid attention to? Here's a detailed introduction to everyone.
The laser cutting section will form vertical lines. The depth of the lines determines the roughness of the cutting surface. The lighter the lines, the smoother the cutting surface.
Roughness affects not only the appearance of the edges, but also the friction characteristics. In most cases, it is necessary to reduce the roughness as much as possible, so the shallower the texture, the higher the cutting quality.
If the thickness of the sheet metal exceeds 10mm, the verticality of the cutting edge is very important. When away from the focal point, the laser beam becomes divergent, and depending on the position of the focal point, the cut becomes wider toward the top or bottom.
The cutting edge is a few millimeters away from the vertical line. The more vertical the edge, the higher the cutting quality.
3. Cutting width:
The cut width generally does not affect the cutting quality. Only when a particularly precise contour is formed inside the part, the cutting width has an important effect, because the cutting width determines the minimum inner warp of the contour;
As the thickness of the sheet increases, so does the cutting width. Therefore, we want to ensure the same high accuracy, regardless of the width of the cut, the workpiece should be constant in the processing area of the laser cutting machine.
When cutting thick plates at high speeds, molten metal does not appear in the cuts under the vertical laser beam, but instead sprays out at the rear of the laser beam.
As a result, curved 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.
The formation of burrs is a very important influencing factor in determining the quality of laser cutting. Because the removal of burrs requires additional work, the severity of the burrs and the amount of burrs can intuitively judge the quality of the cut.
6. Material deposition:
The laser cutting machine encounters a special oily liquid on the surface of the workpiece before it begins to melt the perforations.
During the cutting process, because the gasification and various materials are not used, the customer uses wind to remove the cut, but the upward or downward discharge will also form a deposit on the surface.
7. Depression and corrosion:
Sinking 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:
In laser cutting, the area near the cut is heated. At the same time, the structure of the metal changes. For example, some metals will harden. The heat affected area refers to the depth of the area where the internal structure changes.
If the cutting heats the part sharply, it will deform. This is particularly important in fine machining, where the contours and webs are usually only a few tenths of a millimeter wide.
Controlling laser power and using short laser pulses can reduce component heating and avoid distortion.
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