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How to judge the quality of laser cutting metal? It is enough to look at these four points
- Mar 24, 2018 -

Laser cutting machines are often considered to have high cutting efficiency, better cutting quality, and are increasingly being applied to metal processing. However, the quality assessment of laser cutting has not yet achieved a unified standard internationally. Therefore, many people are not sure how to judge the quality of laser cutting machines when they are looking for laser cutting machines.

When using a laser cutting machine to process metal, the quality of the process is evaluated including the following:

Smooth cutting surface, less lines, no brittle fracture

When the laser is cutting the plate at a high temperature, the traces of the molten material do not appear in the cuts below the vertical laser beam, but rather they are ejected at the back of the laser beam. As a result, the curved lines are formed at the cutting edge, and the lines closely follow the moving laser beam. In order to correct this problem, lowering the feed rate at the end of the cutting process can greatly eliminate the formation of the lines.

Narrow slit width

The width of the cut generally does not affect the cutting quality. The cut width has an important effect only when a particularly precise outline is formed inside the part. This is because the cut width determines the minimum inner diameter of the outline. When the thickness of the plate increases, the cut width also increases. The increase. So you want to ensure the same high accuracy, regardless of the width of the incision, the workpiece in the laser cutting machine processing area should be constant.

Good slitting verticality, small heat affected area

When the thickness of the processed material exceeds 18 mm, the perpendicularity of the cutting edge is very important; when away from the focal point, the laser beam becomes divergent, and the cut broadens toward the top or bottom depending on the position of the focal point. The cutting edge is a few hundredths of a millimeter from the vertical, and the more vertical the edge, the higher the cutting quality.

Cutting material thermal effects

As a thermal cutting processing application equipment, it will inevitably cause thermal effects on the material during its use. Its manifestation mainly includes three aspects: a. heat affected area; b. depression and corrosion; c. material deformation

Among them, the heat-affected zone is laser cutting and is heated along the area near the incision. At the same time, the structure of the material itself changes. For example, some materials can harden. The heat-affected zone refers to the regional change in the internal structure due to high temperature.

The depressions and erosions have a detrimental effect on the surface of the cutting edge, affecting the appearance of the laser cutter. They appear to be cutting errors that should otherwise be avoided; in the end, if the cutting causes the component to heat rapidly, it will deform.

This is particularly important in fine processing because the outlines 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 the heating of parts and avoid distortion.