The cutting speed range of the portable CNC cutting machine can be selected according to the equipment description or determined by experiment. Because of the thickness, material, melting point, thermal conductivity and surface tension after melting, the cutting speed is also corresponding. Variety. When the cutting speed is too low, because the cutting point is the anode of the plasma arc, in order to maintain the arc itself, the anode freckles or the anode area must find the conduction current around the slit closest to the arc, and at the same time the diameter of the jet More heat is transferred, so that the slit is widened, and the material melted on both sides of the slit is extracted and solidified at the bottom edge, forming a dross that is difficult to clean, and the upper edge of the slit is rounded due to excessive melting by heating.
It can be seen that good cutting quality and cutting speed are inseparable. When the speed is low, the arc will even go out because the slit is too wide.
The cutting range of the portable CNC cutting machine mainly shows that the cutting speed can be improved moderately, the cutting quality can be improved, that is, the slit is slightly narrowed, the surface of the slit is flatter, and the deformation can be reduced, and the cutting speed is too fast, so that the cutting line energy is lower than The required amount, the jet in the slit can not immediately blow off the melted cut melt to form a large rear drag, accompanied by the slag hanging on the slit, and the surface quality of the cut is degraded.