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Attention should be paid to the preheating of CNC flame cutting machine

Anyone who uses a CNC flame cutting machine knows that preheating in flame cutting is very important. The process of gas cutting in the CNC flame cutting machine is that a jet of pure oxygen (at least 99.5%) is ignited and burned on the surface of the workpiece. The heating flame starts this process by heating the starting point of the workpiece to be cut to the ignition temperature.

The combustion is started by delivering cutting oxygen. Due to the increase in heat, the combustion continues rapidly in the adjacent workpiece. The moving torch cuts a slit. The burning molten material is blown away by the kinetic energy of the cutting oxygen jet. The following conditions must be completed when cutting:

(1) The ignition temperature of the material must be lower than its melting temperature.

(2) To exclude the generated metal oxide, the melting temperature of the oxide must be lower than the melting point of the material.

(3) Continuously maintain the ignition temperature at the cutting point. The heat loss is compensated by the heating flame. Both non-alloy plates of steel with a carbon content of less than 0.3% and low alloy steel with a carbon equivalent of more than 0.4% can be cut after preheating. As the proportion of metal elements increases, the cutting process will become more and more difficult. For this reason, materials such as chrome steel-nickel or silicon metal, cast steel, etc. Have no special precautions and are not suitable for oxygen cutting. These materials should be processed by other methods—a method for thermal cutting.

During the preheating process, the length of the preheating time can be increased or decreased according to the actual preheating situation. Similarly, the modified warm-up time will be memorized. The next warm-up will be preheated according to the modified warm-up time.