Many companies use plasma cutting machines. Although CNC plasma cutting machines have the characteristics of fast cutting speed and small slitting during the cutting process, many user companies often have various problems in the actual operation process, leading to actual cutting speeds. Limited, slicing too large, not cut the surface, etc., to exclude the plasma cutting machine itself mechanical failure and other factors, the user company is not properly set in the operation of the plasma CNC cutting machine related parameters will also affect the actual cutting effect, directly affect the plasma arc The compression effect, which affects the temperature and energy density of the plasma arc, and the high temperature and high energy of the plasma arc determine the cutting speed. Therefore, the experience of producing and selling products summarizes some factors that may cause these errors.
The following factors are all related to the cutting speed. In the premise of guaranteeing the cutting quality, 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 parts and the heat affected zone of the kerf area. If the cutting speed is not suitable, the effect is reversed, and the sticky slag will increase and the cutting quality will decrease.
1. No-load voltage and arc-column voltage plasma cutting power supply must have a sufficiently high no-load voltage for easy arc ignition and stable plasma arc ignition. The no-load voltage is generally 120-600V, and the arc-column voltage is generally half of the no-load voltage. Increasing the voltage of the arc column can significantly increase the power of the plasma arc, which can increase the cutting speed and cut a larger thickness of sheet metal. The arc-column voltage is often not reached by adjusting the gas flow and increasing the internal shrinkage of the electrode, but the arc-column voltage cannot exceed 65% of the no-load voltage, otherwise the plasma arc will be unstable.
2. The increase of the cutting current and 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 kerf width will increase, and the electrode life will decrease.
3. Increased gas flow rate The gas flow rate can not only increase the voltage of the arc column, but also enhance the compression of the arc column to make 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 become shorter and the loss of heat will increase, which will weaken the cutting ability until the cutting process is not performed properly.
4. The amount of shrinkage in the electrode The so-called shrinkage is the distance from the electrode to the end surface of the cutting nozzle. The proper distance can make the arc well compressed in the cutting nozzle and obtain an energy-concentrated, high-temperature plasma arc for efficient cutting. If the distance is too large or too small, the electrode may be severely burned, the cutting nozzle burned, and the cutting ability may be reduced. The inner shrinkage generally takes 8-11mm.
5. Cutting nozzle height Cutting nozzle height refers to the distance from the cutting nozzle face to the surface of the workpiece being cut. The distance is generally 4~10mm. It is the same as the internal shrinkage of the electrode, and the distance must be appropriate to fully exert the cutting efficiency of the plasma arc, otherwise the cutting efficiency and the cutting quality will be reduced or the cutting nozzle will be burned.
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