Small accessories play a big role, the correct choice and use of laser cutting nozzle

Laser head nozzle in the laser cutting process, through the collection of capacitive signals, through the ceramic ring will be transmitted to the signal processor, so as to maintain the laser cutting machine in the cutting process of the laser head to the workpiece distance tracking, guide the gas smoothly through the workpiece being cut, and in the nozzle outlet attachment to form a high pressure, speed up the cutting speed, take away the slag, to protect the internal lens of the laser head.

The coaxiality of the nozzle exit hole and the laser beam is one of the important factors affecting the quality of the cut, especially when the thicker the workpiece is cut, it has a greater impact. Therefore, the concentricity of the nozzle center and the laser must be adjusted to obtain a better cutting section.

When the nozzle center and the laser beam center are different axes

The effect on the cutting quality

1. The cutting gas is emitted from the nozzle center and acts on the cut sheet. According to the positive and negative direction of the X-axis and Y-axis, respectively, the laser spot can be divided into four areas, when the laser is not in the center of the nozzle, prone to inconsistent effect of the four sections, such as carbon steel thick plate small nozzle cutting, some surface bright surface effect, some surface stripes coarse, or even hanging slag or cut constantly.

2. 10,000 watts cutting carbon steel bright surface effect, are currently using a small nozzle combined with high focus process, the laser is not in the center of the nozzle, slightly easy to cause the nozzle heat, affecting the follow-through, can not be stable processing, serious direct burn nozzle.

Nozzle and laser beam coaxiality

Commissioning method

Nozzle

Type

General laser cutting nozzle is divided into single and double layers, single layer nozzle for melting cutting, that is, using nitrogen as an auxiliary gas, usually used for cutting stainless steel, aluminum, brass, etc.; double layer nozzle is generally used for oxidation cutting, that is, using oxygen as an auxiliary gas, usually used for cutting carbon steel.

Nozzle

Size selection

Nozzle diameter size determines the shape of the airflow into the notch, gas diffusion area, gas flow rate, which affects the removal of molten material, cutting stability. The higher the gas flow into the kerf, the higher the speed, and the proper position of the workpiece in the gas stream, the better the ability of the jet to remove the melt.

Users choose the nozzle size according to the power of the laser used and the thickness of the sheet metal to be cut. Theoretically, the thicker the sheet, the larger the nozzle should be used, the higher the proportional valve setting pressure and the higher the flow rate to ensure the pressure in order to cut a normal section effect.

Different power

Nozzle selection

Laser power ≤ 6000W

cutting carbon steel, nozzle specifications for the general diameter of double-layer S1.0 ~ 5.0E.

cutting stainless steel, the choice of ordinary specifications single-layer nozzle.