Relationship between voltage and current control of plasma cutting machine

Voltage and current control and influence of CNC plasma cutting machine

The advantages of CNC plasma cutting machines are the fast cutting speed, small slits and wide cutting range, which is very attractive for most companies, but when the equipment is actually used after purchase, it will A variety of problems have been encountered, resulting in limited cutting speed, excessive kerf, and uneven cutting. In addition to the mechanical failure of the plasma CNC cutting machine, the user does not correctly set the relevant parameters of the plasma CNC cutting machine in use, which is also one of the important factors affecting the actual cutting effect. CNC plasma cutting is different from traditional flame cutting. Because of the need to introduce plasma power supply accessories, it is especially important to control the relevant parameters of the power supply. Below Xuzhou Yahong CNC equipment manufacturing plant will have problems in voltage and current control of CNC plasma cutting machine . Come and find out, there are some shortcomings, please forgive me.

The plasma cutting power supply must have a high enough no-load voltage to easily induce arcing and stabilize the plasma arc. 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, thereby increasing the cutting speed and cutting a larger thickness of the metal sheet. The arc column voltage is often not achieved by adjusting the gas flow rate and increasing the electrode internal shrinkage, but the arc column voltage cannot exceed 65% of the no-load voltage, otherwise the plasma arc will be unstable.

Increasing the cutting current also increases the power of the plasma arc, but it is limited by the large allowable current, otherwise the plasma arc column becomes thicker, the slit width increases, and the electrode life decreases.