Meisar gantry cnc plasma cutting machine and cutting effection
Many user enterprises in the actual operation process will often appear a variety of problems, resulting in the actual cutting speed is limited, cutting too large, cutting surface uneven and other phenomena, to eliminate cnc plasma cutting machine itself mechanical failure and other factors, the user in the operation did not correctly set the plasma CNC cutting machine related parameters will also affect the actual cutting effect.
1. Cutting speed
The above factors directly affect the compression effect of the plasma arc, that is, affect the temperature and energy density of the plasma arc, and the high temperature and high energy of the plasma arc determine the cutting speed, so the above factors are related to the cutting speed. Under the premise of ensuring the quality of cutting, the cutting speed should be increased as much as possible. This not only increases productivity, but also reduces the amount of deformation of the cut part and the thermal impact area of the cut area. If the cutting speed is not suitable, the effect is reversed, and will increase the slag, the cutting quality is reduced.
2. Indentation of electrodes
The so-called internal shrinkage refers to the distance from the electrode to the end face of the cut mouth, the appropriate distance can make the arc in the cut mouth to get a good compression, to obtain energy concentration, high temperature of the plasma arc and effective cutting. Too large or too small distance, will cause the electrode serious burn, cut the mouth burned and reduce the cutting capacity. The indentation is generally 8-11mm.
3. Empty arc voltage and arc column voltage
Plasma cutting machine, must have a high enough empty load voltage, in order to easily lead the arc and make the plasma arc burning steadily. The empty voltage is generally 120-600V, while the arc column voltage is generally half the empty load voltage. Increasing the arc column voltage can significantly increase the power of the plasma arc, thus increasing the cutting speed and cutting a larger thickness of the metal sheet. Arc column voltage is often not reached by regulating the gas flow and increasing the shrinkage of the electrode, but the arc column voltage cannot exceed 65% of the empty load voltage, otherwise the plasma arc will be unstable.
4. Gas flow
Increasing the gas flow can not only increase the arc column voltage, but also enhance the compression of the arc column, so that the plasma arc energy is more concentrated, the injection force is stronger, thus improving the cutting speed and quality. However, the gas flow is too large, but will make the arc column shorter, the loss of heat increased, so that cnc plasma cutting machine cutting capacity weakened, until the cutting process can not be carried out normally.
5. Cutting nozzle height
The height of the cut is the distance from the end face of the cut to the surface of the cut workpiece. The distance is generally 4 to 10mm. It is the same as the shrinkage of the electrode, the distance should be appropriate in order to give full play to the cutting efficiency of the plasma arc, otherwise it will reduce the cutting efficiency and cutting quality or make the cut mouth burned.
