The quality of the cutting effect of CNC flame cutting machine depends largely on the mastery of adjustment technology. The cutting gas used in CNC flame cutting machine is different. When cutting carbon plates of different thicknesses, the flame temperature should also be controlled to consider the cutting speed.

CNC flame cutting machine can obtain different cutting flames according to different adjustment methods, thereby obtaining different cutting effects. By adjusting the ratio of oxygen to acetylene, it is generally divided into three types of flames: normal flame, oxidation flame and reduction flame. The characteristics of these three types of cutting flames are different. Generally, ordinary flames can be used to obtain better cutting quality when cutting steel plates of 200 mm or less. When cutting large thickness steel plates, since the flame of the reduction flame is relatively long, the reduction flame should be preheated and cut, and the length of the flame should be at least 1.2 times the thickness of the steel plate.

1. Normal flame

Conventional fire adjustment technology The characteristic of the conventional flame is that there is no free oxygen and activated carbon in the reduction zone. There are three different zones, and the flame core has a clear outline near the cylinder. The composition of the flame core is acetylene and oxygen, and its end is uniformly round and shiny. The shell is composed of red hot carbon spots. The temperature of the flame core reaches 1000°C. The reduction zone is outside the flame core, and its obvious difference from the flame core is its darkness. The reduction zone is composed of carbon monoxide and hydrogen that are not completely burned by acetylene, and the temperature of the reduction zone can reach about 3000°C. The external flame is a complete combustion zone, which is located outside the reduction zone. It is composed of carbon dioxide, water vapor, nitrogen, and the temperature varies between 1200 and 2500°C.

The neutral flame we are talking about here is the state of a normal CNC cutting machine, but in actual operation, the success of adjustment is only the final result. In fact, the possibility of oxidation flame and reduction flame is still relatively high.

Second, oxidation flame

In the case of excessive oxygen, an oxidizer flame will be generated. The flame core is conical, the length is significantly shortened, the outline is unclear, and the brightness is dim. Similarly, the reduction zone and the external flame are shortened, and the flame is purple-blue. The sound is accompanied by sound, and the sound is related to the pressure of oxygen. The temperature of the oxidation flame is higher than that of the normal flame. If you use oxidation flame cutting, the cutting quality will be greatly reduced.

3. Reduction flame

When acetylene is excessive, a reduction flame will be produced. The flame core has no obvious outline, and there is a green edge at the end of the flame core. Excessive acetylene is judged based on the green edge. The reduction zone is abnormally bright, almost flame. The flame outside is yellow. When there is too much acetylene, it starts to smoke because the flame lacks the necessary oxygen when acetylene burns.

The energy of the preheating flame seriously affects the cutting speed and cutting quality. The preheating flame is too weak, which is not enough for the steel plate to obtain sufficient energy, and is forced to reduce the cutting speed, and even causes the cutting process to be interrupted; the preheating flame is too strong, the reaction heat generated by the combustion of the metal increases, and the preheating ability of the leading edge of the cutting edge is enhanced, which will cause the upper edge of the gap to melt and collapse severely, especially when cutting thick plates. The preheating flame intensity and cutting speed system are mutually restricted. As the thickness of the workpiece to be cut increases and the cutting speed increases, the energy of the flame should also increase with the thickness of the sheet.