In practical operation , the optimum cutting speed range can be determined according to the equipment description or test . However , because of the thickness of the workpiece to be cut, the material is different ( such as copper, stainless steel, galvanized sheet, aluminum, carbon steel and other ferrous and non-ferrous metals ) , the melting point , the thermal conductivity and the surface tension after melting , the cutting speed of the CNC plasma cutting machine is correspondingly changed. The main performances are as follows:
1.Plasma CNC cutting machine in the modest increase in cutting speed can improve the quality of incision, the incision slightly narrowed, incision surface is more smooth, while reducing deformation.
2.When the cutting speed of plasma cutting machine is too fast to make the cutting line energy is lower than the desired value, the jets in the kerf can not quickly blow away the melted cutting melt to form a larger amount of trailing drag along. It will lead to incision dross and the cutting surface quality decline.
3.When the plasma cutting machine is too low in cutting speed, since the cutting point is the plasma arc anode, in order to maintain the stability of the arc itself, the anode spot or anode region must find the conduction current in the vicinity of the slit near the arc. Besides, the more radial heat transfer to the jet, so that the incision widening, both sides of the incision melted material gathered in the bottom edge and solidified to form a hard to clean dross, and the upper edge of the incision due to heat melting too much to form a rounded corner.