Evaluation criteria for cutting quality of laser cutting machine

For laser cutting of plates with a thickness of more than 2mm, the distribution of the roughness of the cutting surface is uneven and varies greatly along the thickness direction, with two characteristics:

1. The cutting surface morphology is divided into two distinct parts. The surface of the upper part is flat and smooth, the cutting stripes are neat and fine, and the roughness value is small; The lower part has disordered cutting stripes, uneven surface and large roughness value. The upper part is characterized by direct action of laser beam, while the lower part is characterized by erosion of molten metal.

Whether it is continuous laser cutting or pulse laser cutting, the cutting surface shows upper and lower parts. The difference is that pulse laser cutting has a corresponding relationship between the upper cutting stripes and the pulse frequency: the higher the frequency, the finer the stripes, and the smaller the surface roughness.

2. The surface roughness in the upper area of the cutting surface is generally uniform and does not change with the height; The surface roughness of the lower area varies with the height. The closer to the lower edge, the greater the surface roughness duty.