There are various types of cutting machines, and the functions and characteristics of different types of cutting machines are different. CNC flame cutting machine is one of them. Many users report that they do not know how to debug flames when using CNC flame cutting machines. In fact, we only need to understand the specific characteristics of the normal flame of CNC flame cutting machines

The reduction zone is located outside the flame core, and the obvious difference from the flame core lies in its darkness. The reduction zone is composed of carbon monoxide and hydrogen gas, which are not completely burned by acetylene. The temperature of the reduction zone can reach about 3000 ℃. The external flame is a complete combustion zone located outside the reduction zone. It is composed of carbon dioxide, water vapor, and nitrogen, and its temperature varies between 1200 and 2500 ° C. Recommended reading: What is the workflow of CNC plasma cutting machines

Produce an oxidation flame in the presence of excessive oxygen. The flame core is conical in shape, with significantly shortened length, unclear contour, and dim brightness; Similarly, the reduction zone and external flames are shortened, and the flames appear purple blue. Sound is accompanied by sound, which is related to the pressure of oxygen. The temperature of an oxidation flame is higher than that of a regular flame. If oxidation flame is used for cutting, the cutting quality will be significantly reduced.

Generate a reducing flame in the presence of excessive acetylene. The flame core does not have a clear outline, and the end of the flame core has a green edge. According to the green edge, there is an excess of acetylene; The reduction zone is exceptionally bright, almost mixing with the flame core; The flames outside are yellow. When there is too much acetylene, it will start emitting black smoke because the acetylene combustion in the flame lacks the necessary oxygen

The energy of preheating flames is closely related to cutting speed and cutting quality. As the thickness of the workpiece to be cut increases and the cutting speed increases, the energy of the flame should also increase, but should not be too strong, especially when cutting thick plates, the reaction heat generated by metal combustion increases, and the cutting is strengthened. At this point, the preheating flame with excessive preheating capacity at the leading edge will cause the upper edge of the slit to melt and collapse. If the preheating flame is too weak, it will cause the steel plate to not obtain enough energy, which will reduce the cutting speed and even interrupt the cutting process. Therefore, the relationship between the intensity of preheating flame and cutting speed is mutually limiting.

Usually, CNC flame cutting machines use neutral flames to cut steel plates below 200mm to achieve better cutting quality. When cutting thick steel plates, preheating and cutting of the reducing flame should be carried out, as the flame of the reducing flame is relatively long and the length of the flame should be at least 1.2 times the thickness of the plate.