How to judge the cutting quality of laser cutting machine?

Laser Cutting is to focus the laser light emitted from the laser into a high-power density laser beam through the optical path system. The laser beam irradiates the surface of the workpiece to make the workpiece reach the melting point or boiling point, and the high-pressure gas coaxial with the beam blows away the molten or vaporized metal. As the relative position of the beam and the workpiece moves, the material will eventually form a slit, so as to achieve the purpose of cutting. So how should we judge the cutting quality of Laser Cutting Machine? Let's take a look at these nine standards together!

1. Roughness

The laser cutting section will form vertical lines. The depth of the lines determines the roughness of the cut surface. The shallower the lines, the smoother the cut section. Roughness not only affects the appearance of the edge, but also affects the friction characteristics. In most cases, it is necessary to minimize the roughness, so the shallower the texture, the higher the cutting quality.

2. Verticality

If the thickness of the sheet metal exceeds 10mm, the verticality of the cutting edge is very important. When away from the focus, the laser beam becomes divergent, and the cut becomes wider toward the top or bottom depending on the position of the focus. The cutting edge deviates from the vertical line by a few hundredths of a millimeter. The more vertical the edge, the higher the cutting quality.

3. Cutting width

Generally speaking, the cutting width does not affect the cutting quality. The cutting width has an important effect only when a particularly precise contour is formed inside the part. This is because the cutting width determines the minimum inner warp of the contour. When the thickness of the sheet increases, the cutting width also changes. The increase. Therefore, in order to ensure the same high accuracy, no matter how large the width of the incision is, the processing area of the workpiece in the laser cutting machine should be constant.

4. Grain

When cutting thick plates at high speed, the molten metal will not appear in the cut below the vertical laser beam, but will spray out at the rear 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, reducing the feed rate at the end of the cutting process can greatly eliminate the formation of lines.

5. Burr

The formation of burrs is a very important factor that determines the quality of laser cutting. Because the removal of burrs requires extra work, the severity and amount of burrs can intuitively judge the quality of the cutting.

6. Material deposition

The cnc laser cutter first hits a layer of special oily liquid on the surface of the workpiece before it starts to melt and perforate. Vaporization and various, the material does not require the customer to use the wind to remove the incision, but the upward or downward discharge will also form a deposit on the surface.

7. Depression and corrosion

Concavity and corrosion have an adverse effect on the surface of the cut edge and affect the appearance.

8. Heat Affected Zone

In laser cutting, the area near the incision is heated. At the same time, the structure of the metal changes. 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 cutting causes the part to heat up sharply, it will deform. This is particularly important in fine machining, because the contours and connecting pieces here are usually only a few tenths of a millimeter wide. Controlling the laser power and using short laser pulses can reduce parts heating and avoid deformation.