How to choose a suitable cutting nozzle when cutting with fiber laser cnc cutting machine?

The nozzle is an important part of the laser cutting machine. During the laser cutting process, the nozzle is responsible for maintaining the distance between the laser head and the workpiece, guiding the auxiliary gas to pass through the workpiece smoothly, and forming a high pressure at the nozzle outlet to speed up the cutting speed and take away The slag protects the internal lens of the laser head. The choice of nozzle directly determines the quality of laser cutting.


Types of nozzles: According to the different gases used, they are generally divided into single-layer nozzles and double-layer nozzles. Single-layer nozzles are used for melting and cutting, and nitrogen is used as auxiliary gas for cutting stainless steel, aluminum alloys, etc.; double-layer nozzles are used for oxidation cutting. Oxygen is used as auxiliary gas for cutting carbon steel.


Nozzle size selection: The diameter of the nozzle determines the shape of the airflow entering the incision and the gas diffusion area, which affects the stability of laser cutting. Theoretically, the thicker the workpiece, the larger the nozzle diameter should be, and the larger the gas pressure and flow rate, in order to cut the ideal processing surface. Generally speaking, Φ1mm nozzles are used for sheet thickness below 3mm, Φ1.5mm nozzles are used for 3-10mm, and Φ2mm or larger nozzles are used for sheets above 10mm.

What should I do if the nozzle is hot?


1. Check whether the cooling equipment is turned on, and turn on the cooling equipment;


2. Check whether the focusing optical path is correct, and adjust the focusing optical path;


3. Check whether the nozzle is blocked and clean the nozzle;


4. Avoid long-term continuous work, and let the equipment cool down regularly.


In summary, choosing the right nozzle has a decisive impact on the cutting quality of the laser cutting machine. We should choose an appropriate nozzle aperture according to the material and thickness of the workpiece; at the same time, we should maintain the nozzle regularly to avoid its heating phenomenon and ensure the stability of laser cutting.