How to solve the arc instability of plasma cutting machine
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If the arc instability of plasma CNC cutting machine will reduce the cutting quality of the cutting machine, resulting in uneven cutting, it will also lead to the reduction of the life of the relevant components of the control system. The arc instability is caused by the absence of a dedicated grounding tool, insulation on the surface of the workpiece, and serious grounding of long-term aging. Special grounding tools should be used, and check whether any insulators affect the ground wire and the surface of the workpiece and avoid the use of aging. The grounding wire has a large-scale power supply facility at the site where the work is to be performed. The internal main component failure of the cutting machine will cause the input AC voltage to be too low.
Working pressure lower than the manual pressure will reduce the discharge speed of the plasma arc, the input air flow is less than the specified value, can not form high-energy, high-speed plasma arc, resulting in poor cutting quality and impenetrable, pay attention to observe before use Air compressor output pressure display does not meet the requirements to adjust. When the CNC plasma cutting machine is working, the high-frequency oscillator excites the gas between the electrode and the inner wall of the nozzle, generates high-frequency discharge, and partially ionizes the gas to form a small arc. This small arc hand compresses the air and ejects it from the nozzle. Ignite the plasma arc, which is the main task of the spark generator. If the input air pressure exceeds 0.45 MPa, an excessively large air flow after the formation of the plasma arc will blow off the concentrated arc column, which will disperse the energy of the arc column and weaken the cutting strength. When using, check whether the air compressor is properly adjusted and whether the pressure of the air compressor and the air filter regulator is out of regulation. Such as rotary air filter pressure reducing valve adjustment switch, indicating that there is no change in the air filter pressure reducing valve failure, need to replace the pressure or overhaul air compressor.
Improper installation of the nozzles, lack of tightening of the threads, improper adjustment of the cutting position, and the fact that the cooling moments that require water cooling do not pass the flowing cooling water and frequent arcing, can cause premature nozzle damage. According to the technical requirements of cutting the workpiece, properly adjust the gear position of the equipment, check whether the torch nozzle is installed firmly, circulate the cooling water in advance, and adjust the distance between the cutting moment and the workpiece according to the thickness of the workpiece.
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