How to choose the nozzle of fiber laser cutting machine?

How to choose the nozzle of fiber laser cutting machine?

Nozzle is a very common wearing part on laser cutting machine, and it is also an important part of laser cutting. It is located at the bottom of the laser head, very close to the workpiece, and the focused laser and high-pressure air flow are emitted through the nozzle, so it plays a very important role in the cutting process. It can help the gas to be ejected quickly, can effectively prevent debris and other debris from bouncing upwards, thereby protecting the focusing lens, and can control the area and size of gas diffusion, thereby affecting the cutting quality of the laser cutting machine. How to choose the nozzle of fiber laser cutting machine?

1. Nozzle size:

The nozzle size is selected according to the thickness of the sheet metal cut by the user. The aperture of the nozzle controls the air flow and the shape of the air field, which is very important for the quality of the cut. Generally, when using a laser cutting machine to cut a thin plate less than 3mm, it is recommended to use a nozzle with a diameter of 1mm, and a nozzle with a thickness of 3mm or more is recommended to choose a nozzle with a diameter of 1.5. mm For cutting sheet metal larger than 10mm, a nozzle with a diameter of 2mm or larger is usually chosen.

2. Nozzle material:

For a good nozzle, the material must have high electrical conductivity and good thermal conductivity. Generally speaking, copper nozzles are better than brass ones and can ensure a good capacitive signal.

3. Nozzle machining accuracy:

A good laser head nozzle should have a concentricity of 0.03mm, and a nozzle with a size smaller than 1.0mm should have a concentricity of 0.02mm. The high-precision concentric nozzle can not only reduce the early debugging in the processing process, but also effectively prevent the high-energy laser from hitting the inner wall of the laser head, thereby avoiding damage to the laser head.

4. Nozzle surface smoothness and anti-oxidation treatment:

The smooth surface and good anti-oxidation treatment can effectively reduce the adhesion of the melt during the cutting process and prolong the service life of the nozzle.