Analysis of Power Supply Specifications of CNC Plasma Cutting Machine

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Speaking of CNC plasma cutting machine, its power supply is playing a decisive role. It not only can effectively improve the cutting effect and quality of the cutting machine, but also can save the purchase cost of the CNC cutting machine in the long-term interest.
CNC plasma cutting machine is a new type of thermal cutting equipment. Its working principle is to use the heat of high-temperature plasma arc to locally melt (and evaporate) the metal at the notch of the workpiece, and remove the molten metal to form an incision by the momentum of high-speed plasma. A processing method.
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 internal shrinkage of 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 effective 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 is generally taken as 3. Cutting height The cutting height is the distance from the end of the cutting nozzle 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 cutting quality will be reduced or the cutting nozzle will be burned.
4. Various factors above the cutting speed directly affect the compression effect of the plasma arc, that is, the temperature and energy density of the arc of the CNC cutting machine. The high temperature and high energy of the plasma arc determine the cutting speed. Therefore, all the above factors are Cutting speed related. 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 appropriate, the effect is reversed, and the sticky slag will increase, and the cutting quality will decrease.
Plasma cutting machine is widely used in automobiles, locomotives, pressure vessels, chemical machinery, nuclear industry, general machinery, engineering machinery, steel structures and other industries!
5. Increasing the cutting current 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.
6. Increased gas flow The gas flow can both increase the arc-column voltage and enhance the compression of the arc column, making the plasma arc energy more concentrated and the jetting force stronger, thereby increasing 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.
The work place and working environment of CNC plasma cutting machines are comparatively bad and metal dust is relatively large. Therefore, the machine must be thoroughly cleaned and maintained. The person responsible should be responsible for the lubrication, repair and maintenance of the equipment!
CNC plasma cutting machine has the characteristics of fast cutting speed, small slitting, etc. in the cutting process, but many user companies often have various problems in the actual operation process, leading to the actual cutting speed is limited, the slotting is too large, the cutting surface Incomplete phenomenon, to exclude the factors such as CNC flame cutting machine mechanical failure, user companies in the operation is not properly set plasma CNC cutting machine related parameters will also affect the actual cutting effect, the following will be the actual use of experience to summarize the impact of CNC plasma cutting machine cutting The effect of various aspects of the factors, and the majority of users of the company to exchange some hope that the following summary can help the relevant user companies, in the actual use of the process to adjust the use of equipment in order to achieve the best cutting results.
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