Usually, the cutting speed range of the CNC plasma cutting machine can be selected according to the equipment instructions or determined by experiments, when the CNC plasma cutting machine is at a very low cutting speed.
However, due to the thickness of the workpiece to be cut, different materials (such as copper, stainless steel, galvanized sheet, aluminum, carbon steel and other ferrous and non-ferrous metals) melting point, thermal conductivity and surface tension after melting and other factors, so CNC The cutting speed of the plasma cutting machine also has corresponding changes, which are mainly expressed as the following points:
1. When the cutting speed of the CNC plasma cutting machine is moderately increased, the quality of the incision can be improved, that is, the incision is slightly narrowed, the appearance of the incision is smoother, and the deformation can be reduced at the same time.
2. When the cutting speed of the CNC plasma cutting machine is too fast, the cutting line energy is lower than the required value, and the jet in the slit cannot quickly blow off the molten cutting melt, resulting in a large amount of back drag. The slag hangs on the incision, and the surface quality of the incision decreases.
3. When the cutting speed of the CNC plasma cutting machine is too low, since the cutting place is the anode of the plasma arc, in order to maintain the stability of the arc itself, the anode spot or anode area must find the conduction current near the slit closest to the arc. At the same time, it will transfer more heat to the radial direction of the jet slow-moving wire, so the incision is widened, and the molten material on both sides of the incision gathers and solidifies at the bottom edge, forming slag that is not easy to clean, and the upper edge of the incision is numerically controlled. Plasma cutters have rounded corners due to excessive heating and melting.
The arc may even be extinguished due to the wide cut. It can be seen that good cutting quality and cutting speed are inseparable.
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