The difference between single and double nozzles for laser cutting machines? How to choose the right nozzle?

On the question of single-layer or double-layer nozzle single-layer laser nozzle is used for melting cutting, that is, using nitrogen as an auxiliary gas, cutting stainless steel and aluminum plate, etc. with a single-layer laser nozzle. Double-layer laser nozzle is generally used for oxidation cutting, that is, the use of oxygen as an auxiliary gas, cutting carbon steel with a double-layer laser nozzle.

On the issue of nozzle aperture selection

Different aperture nozzles are mainly used for different thickness of the plate cutting, thin plate on the use of a smaller spray hole, thick plate on the use of a larger spray hole. Nozzle apertures are: 0.8, 1.0, 1.2, 1.5, 1.8, 2.0, 2.5, 3.0, 3.5, 4.0, 4.5, 5.0, etc., and the most used: 1.0, 1.2, 1.5, 2.0, 2.5, 3.0, which is the most commonly used 1.0, 1.5, 2.0 three. The orifice diameter of the nozzle controls the flow of gas and the shape of the gas field, which is very important for the quality of the cut. The general use of laser cutting machine for thin plate cutting below 3mm, it is recommended to use 1mm diameter size nozzle, while the thickness of more than 3mm is recommended to choose 1.5mm diameter size nozzle. Cutting more than 10mm of sheet metal, the general choice of nozzle diameter of 2mm or more.

Nozzle quality from those aspects to see

First: look at the material, a good nozzle, the material must be a high conductivity, good thermal conductivity. General purple copper material nozzle will be better than brass material to ensure a good capacitive signal.

Second: look at the processing accuracy: a good laser head nozzle, its concentricity to reach 0.03mm, and the size of the nozzle below 1.0mm, concentricity is to reach 0.02mm. high-precision concentricity of the nozzle can not only reduce the processing of the pre-commissioning, more effective to avoid high-energy laser hit the laser head wall, so as to avoid damage to the laser head. Nozzle center and the laser's center is not the same axis, the impact on the cutting quality: 1) affect the cutting section, when the cutting gas in the jet, resulting in uneven gas volume, so that the cutting section is more likely to appear on one side of the melt stains, the other side of the phenomenon is not, on cutting the thin plate below 3mm, it has less impact, in cutting more than 3mm plate, its impact is more serious, sometimes resulting in the inability to cut. 2) Affect the quality of sharp corners, when cutting workpieces with sharp corners or small angles, it is easy to produce local over-melting phenomenon, when cutting thick plates, it may not be able to cut. 3) Affect the perforation, it is not stable when perforating, the time is not easy to control, the perforation of thick plates will cause over-melting, and the perforation conditions are not easy to master, the perforation of thin plates has less impact.

Third: look at the surface finish and anti-oxidation treatment: a clean surface and good anti-oxidation treatment can effectively reduce the adhesion of molten material during the cutting process, extending the life of the nozzle.

Laser cutting machine single-layer nozzle and laser double-layer nozzle difference.

Single-layer laser nozzle for melting cutting, that is, using nitrogen as an auxiliary gas, cutting stainless steel and aluminum plate, etc., with specifications are 1.4-3.0mm single-layer laser nozzle.

Double-layer laser nozzle is generally used for oxidation cutting, that is, the use of oxygen as an auxiliary gas, used to cut carbon steel, with a specification of 1.5-3.0 double-layer laser nozzle.

Laser cutting nozzle how to choose?

1, the size of the nozzle: according to the thickness of the metal plate cut by the user, the choice of nozzle size. The aperture of the nozzle controls the flow of gas and the shape of the gas field, which is very important for the quality of the cut. The general use of laser cutting machine for thin plate cutting below 3mm, it is recommended to choose 1mm diameter size nozzle, while the thickness of more than 3mm is recommended to choose 1.5mm diameter size nozzle. Cutting more than 10mm sheet metal is, generally choose the diameter of 2mm or more nozzle.

2, nozzle material: good nozzle, the material must be high conductivity, good thermal conductivity. General purple copper material nozzle will be better than brass material to ensure a good capacitive signal.

3, the processing accuracy of the nozzle: a good laser head nozzle, its concentricity to reach 0.03mm, and the size of the nozzle below 1.0mm, concentricity is to reach 0.02mm. high-precision concentricity of the nozzle can not only reduce the processing of the pre-commissioning, more effective to avoid high-energy laser hit the laser head wall, so as to avoid damage to the laser head.

4, the nozzle surface finish and anti-oxidation treatment: clean surface and good anti-oxidation treatment can effectively reduce the melt adhesion during the cutting process, extending the service life of the nozzle.