Three areas of laser power (overburned zone, defect free zone, dross zone)

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Inviato il 03 Agosto 2018, 04:29:08

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1. Over-burning zone: When the laser power is too large, the heat input is too large, so that the melting range of the workpiece is larger than the range that can be driven out by the high-pressure airflow, and the molten metal cannot be blown off by the airflow to generate over-burning.
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2. No defect area: that is, the laser power is in a suitable range, and the cutting effect at this time is good, which is called a defect-free area.

3. Slag slag area: When the laser power is too small, the heat is insufficient, the lower the temperature of the molten product near the lower edge, the higher the viscosity, so it cannot be blown off by the high pressure airflow and stays at the lower edge of the cutting surface to produce slag. . In severe cases, the incision cannot be cut.
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Third, the laser cutting machine cutting quality evaluation criteria
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The laser cutting of the cutting plate with a thickness of 2mm or more, the distribution of the roughness of the cutting surface is uneven, and varies greatly along the thickness direction. The change state has two characteristics:

1. The shape of the cutting surface is divided into two distinct parts. The upper part of the surface is smooth and smooth, the cutting stripe is neat and fine, and the roughness value is small; the lower cutting stripe is disordered, the surface is uneven, and the roughness value is large. The upper part has the direct action of the laser beam, and the lower part has the characteristics of molten metal scouring.

Whether it is continuous laser cutting or pulsed laser cutting, the cutting surface is shown with upper and lower parts. The difference is pulse laser cutting and the upper cutting strip has a corresponding relationship with the pulse frequency: the higher the frequency, the finer the stripe, the surface The roughness is smaller.

2. The surface roughness in the area of ​​the upper surface of the cut is substantially uniform and does not vary with height; while the surface roughness of the lower area varies with height, and the closer to the lower edge, the greater the surface roughness.

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