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Four aspects of laser cutting quality judgment
Sep 25, 2018

Mastering the laws of various process factors in the processing of laser cutting machine on the quality of the machined surface, we can find ways to improve the surface quality of the process measures and improve the quality of the machined surface. For laser cutting processing, the quality of processing is mainly evaluated as follows:

1. Smooth cutting surface, less grain, no brittle fracture

When the laser cuts the sheet at a high temperature, the trace of the molten material does not appear in the slit below the vertical laser beam, but instead is 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, the feed rate is reduced at the end of the cutting process, which greatly eliminates the texture.

2. The slit width is narrow. This is mainly related to the diameter of the laser beam spot, depending on the quality of the laser tube.

The width of the cut generally does not affect the quality of the cut, and the cut width has an important effect only when a particularly precise profile is formed inside the part. This is because the cutting width determines the minimum internal warp of the contour. As the thickness of the sheet increases, the cutting width also increases. Therefore, to ensure the same high precision, regardless of the width of the slit, the workpiece should be constant in the processing area of the laser cutting machine.

3. The slit has good verticality and the heat affected area is small.

When the thickness of the processed material exceeds 18 mm, the perpendicularity of the cutting edge is very important. When away from the focus, the laser beam becomes divergent. Depending on the position of the focus, the cut widens towards the top or bottom and the cut edge deviates from the vertical line. The more vertical the edge, the higher the cutting quality.

4. Cutting material heat effect

As a hot-cut processing application device, it is bound to have a thermal impact on the material during use. Mainly reflected in three aspects:

A. heat affected zone.

The heat-affected zone refers to the area in the laser cutting that is heated along the vicinity of the slit. At the same time, the structure of the material itself changes. For example, some materials harden. The heat-affected zone refers to a regional change in the internal structure that changes due to high temperatures.

B. depression and corrosion.

The depressions and corrosion are adversely affecting the surface of the cutting edge and affect the appearance of the laser cutting machine. They appear in cutting errors that should normally be avoided.

C. material deformation.

If the cutting causes the part to heat up sharply, it will deform. This is especially important in fine machining because the contours and tabs here 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.

Four aspects of laser cutting quality judgment

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