Influence of Gas Factors on NC Plasma Cutting Machine

The fiber CNC plasma cutting machine will be affected by the outside world during the cutting process, such as the pressure of the auxiliary gas during the cutting process, which will have a great impact on the cutting results.

The air plasma cutting machine uses the heat of the high temperature plasma arc to locally melt (and evaporate) the metal at the incision of the workpiece, and uses the momentum of the high-speed plasma to remove the molten metal to form a processing equipment method of the incision. With different working gases, it can cut various metals that are difficult to cut by oxygen cutting.

1. The influence of gas pressure on the cutting speed of CNC plasma cutting machine

The CNC plasma cutting machine converts ordinary industrial electricity into a high-temperature plasma arc, uses the energy of the plasma arc to burn the steel plate, and uses the plasma flow to take away the residue to form a cutting method. Increasing the gas pressure can increase the cutting speed, but after reaching the maximum, continuing to increase the gas pressure will cause the cutting speed to decrease.

The reason why the cutting speed of CNC plasma cutting machine decreases under higher auxiliary gas pressure is not only the high airflow speed and the enhancement of the cooling effect of the suspended working area, but also the intermittent shock wave in the airflow has a negative effect on the cooling of the laser working area. Interference is also a major cause of reduced cutting speed.

2. The influence of airflow on the cutting quality of CNC plasma cutting machine

Uneven pressure and temperature in the airflow can cause changes in the flow field density. Such density gradients result in a change in the refractive index in the field, which interferes with the focusing of the beam's energy, resulting in refocusing or beam divergence. This interference affects the melting efficiency and may sometimes change the mode structure, which can lead to a decrease in the cutting quality of the CNC plasma cutting machine if the beam divergence is too large. If the light spot is too large, it will even cause serious consequences that the cutting cannot be carried out effectively.

In order to avoid the adverse effect of high-speed airflow on cutting performance, it can be imagined to change the total pressure distribution in the airflow. Due to this change in airflow pressure distribution, the melting process occurs in the central low-pressure area; the adjacent high-pressure areas can be increased to a sufficient impulse ( medium amount) to ensure more effective slag removal.

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