1、 Relationship between nozzle and cutting quality:

The impact on cutting quality when the nozzle center is different from the center of the laser beam:

1) The impact on the cutting section is uneven when spraying cutting gas, making it easier for the cutting section to have molten stains on one side and not on the other side. The impact on cutting thin plates below 3mm is relatively small. When cutting plates above 3mm, the impact is relatively serious, sometimes making it impossible to cut.

2) It affects the quality of sharp corners. When cutting workpieces with sharp corners or small angles, it is easy to produce local over melting. When cutting thick plates, it may not be possible to cut.

3) It affects perforation, which is unstable during perforation and difficult to control the time. Penetration of thick plates can cause over melting, and the penetration conditions are not easy to grasp, which has a small impact on the perforation of thin plates.

Effect of laser cutting nozzle on cutting quality and selection of nozzle aperture

2、 Selection of nozzle aperture:

The aperture of the nozzle is φ 1.0mm、 φ 1.5mm、 φ 2.0mm、 φ 2.5mm、 φ 3.0mm, etc. Currently, nozzle aperture is commonly used φ 1.5mm、 φ Two types of 2mm. The difference between the two is:

1) Sheets up to 3mm: Use φ 1.5mm, the cutting surface will be thinner; use φ 2mm, the cutting surface will be thicker, and there will be easily molten stains at the corners.

2) Thick plates above 3mm: Due to high cutting power, the heat dissipation time will be prolonged, and the cutting time will also increase. use φ 1.5mm, small gas diffusion area, unstable in use. use φ 2mm, with a large gas diffusion area and a slow gas flow rate, it is relatively stable during cutting.

3) Diameter φ A 2.5 mm aperture can only be used for cutting thick plates above 10 mm. In summary, the size of nozzle aperture has a serious impact on cutting quality and perforation quality. Currently, laser cutting is commonly used φ 1.5mm、 φ Nozzle with a diameter of 2mm.

Therefore, when selecting a larger nozzle aperture, the relative protection of the focusing lens will be poorer, as the possibility of sparks splashing from the molten material during cutting and bouncing upward is high, resulting in a shorter lens life.

The concentricity of the center of the nozzle and the laser is one of the important factors for cutting quality. The thicker the workpiece being cut, the greater its impact. Therefore, it is necessary to adjust the concentricity of the nozzle center and the laser to obtain a better cutting section.

Note: When the nozzle undergoes deformation or there are molten stains on the nozzle, the impact on cutting quality is the same as described above. Therefore, the nozzle should be placed carefully to avoid deformation. Any molten stains on the nozzle should be promptly cleaned. The quality of the nozzle requires high accuracy during manufacturing and requires correct installation methods. If various conditions need to be changed during cutting due to poor quality of the nozzle, the nozzle should be replaced in a timely manner.