The cutting principle of the CNC flame cutting machine is exactly the same as that of the ordinary "gas cutting" hand-held cutting machine, that is, first use the oxygen block flame to burn the incision of the steel piece to be cut to the point of red heat, and then blow into the high-pressure pure oxygen flow to make the cut piece The parts burn violently in the oxygen, melt into liquid, and then are washed away by the air flow, so as to achieve the purpose of cutting. The cutter is the main tool for gas cutting. The difference between a cutting torch and a welding torch is that the cutting torch has a pure oxygen injection tube and multiple nozzles, and the rest of the structural principles are basically the same as the welding torch.
When using the CNC flame cutting machine, turn on the acetylene gas switch first, and then slightly turn on the oxygen switch. After ignition, adjust the oxygen supply to make the oxyacetylene gas a neutral flame. When cutting, first use this oxyacetylene flame to burn the point to be cut to red hot, and then turn off the high-pressure pure oxygen flow switch to make the metal burn violently in the oxygen flow and melt into liquid. Then, move the cutting gun along the line to be cut, cutting through the metal. When cutting, there are requirements for the inclination angle of the cutting gun, cutting speed, oxygen pressure, etc. The inclination of the cutting gun is mainly related to the thickness of the workpiece. When cutting 5~20mm thick steel plate, the torch should be perpendicular to the workpiece without tilting. When the knife is placed straight, the better the quality of the knife, the smaller the cutting opening. When cutting workpieces with a thickness less than 5mm, forward cutting can be used. When cutting workpieces with a thickness greater than 30mm, the torch should be tilted backwards. After the cutting is completed, move the torch and turn the torch one by one to the cutting direction perpendicular to the workpiece. When the cut reaches the head, tilt the cutting gun slightly inward until the cut is complete. The cutting speed depends on the thickness of the workpiece. The thinner the workpiece, the faster the cutting speed and vice versa. The oxygen supply pressure is also related to the thickness of the cutting workpiece. If the oxygen supply is insufficient, it must not penetrate; if the pressure is too high, it will cause a waste of oxygen. After completion, first turn off the high-pressure oxygen gas flow switch, then turn off the acetylene gas switch, and then turn off the oxygen gas switch after the acetylene flame is blown out.