Metal laser cutting machine in the processing of sheet metal will produce a lot of heat, under normal circumstances, the heat generated by the cutting will be spread along the cutting seam to the sheet metal being processed to be fully cooled. Metal laser cutting machine in the processing of small holes, the outside of the hole can be fully cooled, a single hole inside the small hole part is easy because the heat can be diffused in a small space, the heat is too centralized, thus causing overcooking, hanging slag and so on. In addition, in thick sheet metal cutting, the accumulation of molten metal on the surface of the material and the accumulation of heat generated by the perforation will cause the auxiliary airflow to be disorganized and the heat input to be excessive, thus triggering overfiring.

How to avoid overfiring when laser cutting sheet metal?

1. Add cooling points at the corners

When cutting sharp corners of sheet metal, it is easier to overheat the location is often in the sharp corners, overheating will cut the sharp corners into rounded, then you can add a cooling point in the sharp corners, pause at the sharp corners, blowing a little air.

2. Use a high power laser

Cutting carbon steel can use a higher power laser, the use of bright cutting process, can effectively avoid over-burning, and this cutting process can be cut out of burr-free, bright surface of the finished product.

3. Nitrogen cutting

In the sheet metal cutting with oxygen as the auxiliary gas, can be switched to use nitrogen to cut. Nitrogen cutting when the material is completely dependent on the laser energy melting, nitrogen blowing out the cut seam and to avoid inappropriate chemical reactions. The temperature in the melting point area is relatively low, and with the cooling and protection effect of nitrogen, the reaction is smooth and even, and the cutting quality is high. The section is delicate and smooth, with low surface roughness and no oxidized layer.

[4] Increase air pressure

In the use of fiber laser cutting machine processing aluminum alloy and stainless steel, the use of auxiliary gas is nitrogen or with air, in the cutting process will not occur burnt edges, but due to the high temperature of the material on the inside of the small holes, the inside of the hanging slag phenomenon will be more frequent. In this case, you can increase the pressure of the auxiliary gas to reduce burrs and slag hanging.