CNC plasma cutting machine cutting range

Various plasma arc cutting process parameters directly affect the stability, cutting quality and effect of the cutting process. The main cutting specifications are briefly described below:

1. No-load voltage and arc column voltage

CNC plasma cutting machine power supply must have a high enough no-load voltage to easily ignite the arc and make the plasma arc burn stably. The no-load voltage is generally 120-600V, and the arc column voltage is generally half of the no-load voltage. Increasing the arc column voltage can significantly increase the power of the plasma arc, thereby increasing the cutting speed and cutting thicker metal sheets. The arc column voltage is often achieved by adjusting the gas flow and increasing the electrode retraction, but the arc column voltage cannot exceed 65% of the no-load voltage, otherwise the plasma arc will be unstable.

2. Cutting current

Increasing the cutting current can also increase the power of the plasma arc, but it is limited by the maximum allowable current. Otherwise, the plasma arc column will become thicker, the slit width will increase, and the electrode life will decrease.

3． gas flow

Increasing the gas flow can not only increase the arc column voltage, but also enhance the compression effect on the arc column, making the plasma arc energy more concentrated and the injection force stronger, thus improving the cutting speed and quality. However, if the gas flow rate is too large, the arc column will be shortened, the heat loss will increase, and the cutting ability will be weakened until the cutting process cannot proceed normally.

4. Electrode shrinkage

The so-called shrinkage refers to the distance from the electrode to the end face of the cutting nozzle. A suitable distance can make the arc well compressed in the cutting nozzle, and obtain a plasma arc with concentrated energy and high temperature for effective cutting. If the distance is too large or too small, the electrode will be severely burned, the cutting nozzle will be burned, and the cutting ability will be reduced. The amount of shrinkage is generally 8-11mm.

5． Cutting nozzle height

The height of the cutting nozzle refers to the distance from the end surface of the cutting nozzle to the surface of the workpiece being cut. This distance is generally 4~10mm. It is the same as the electrode indentation. The distance must be appropriate to give full play to the cutting efficiency of the plasma arc. Otherwise, the cutting efficiency and cutting quality will be reduced or the cutting nozzle will be burned out.

6． cutting speed

The above factors directly affect the compression effect of the plasma arc, that is, the temperature and energy density of the plasma arc. The high temperature and high energy of the plasma arc determine the cutting speed, so the above factors are related to the CNC plasma cutting machine cutting speed. On the premise of ensuring cutting quality, the cutting speed should be increased as much as possible. This not only improves productivity, but also reduces the deformation of the parts being cut and the heat-affected zone in the slit area. If the cutting speed is inappropriate, the effect will be opposite, and the residue will increase and the cutting quality will decrease.