Fire adjustment method of the hottest flame cuttin

Fire adjustment method of flame cutting machine

how to adjust the fire of flame cutting machine generally speaking, when using flame cutting method, three kinds of cutting flames can be obtained by adjusting the proportion of oxygen and acetylene: neutral flame (i.e. normal flame), oxidation flame and reduction flame

the characteristic of normal flame is that there is no free oxygen and activated carbon in its reduction area, there are three obvious areas, and the flame core has a clear outline (close to cylindrical). The components of the flame core are acetylene and oxygen, and its end is a uniform circular and bright shell. The shell is composed of red hot carbon dots. The temperature of the flame core reaches 1000 ℃. The reduction zone is outside the flame core, and the obvious difference from the flame core is that its brightness is dark. The reduction zone is composed of carbon oxide and hydrogen, the products of incomplete combustion of acetylene, and the temperature in the reduction zone can reach about 3000 ℃. However, many people choose to reuse the outer flame, that is, the complete combustion zone, which is located outside the reduction zone. It is composed of carbon dioxide, steam and nitrogen, and its temperature changes between 1200~2500 ℃

the oxidation flame is produced in the case of excess oxygen. Its flame core is conical, the length is significantly shortened, the outline is not clear, and the brightness is dim from scratch; Similarly, the reduction zone and the outer flame are also shortened. The flame is purple blue, and there is a sound when burning. The size of the sound is related to the pressure of oxygen, and the temperature of the oxidation flame is higher than that of the normal flame. If the oxidation flame is used for cutting, the cutting quality will be significantly deteriorated

the reduction flame is produced in the case of excess acetylene, and its flame core has no obvious outline. There is a green edge at the end of its flame core. According to this green edge, it is judged that there is excess acetylene; The reduction area is unusually bright, almost mixed with the flame core; The outer flame is yellow. When there is too much acetylene, it starts to emit black smoke, because acetylene combustion in the flame lacks the necessary 11. Deformation measurement resolution: 0.001mm; Caused by oxygen

the energy of preheating flame is closely related to cutting speed and cutting quality. With the increase of the plate thickness of the workpiece to be cut and the acceleration of the cutting speed, the energy of the flame should also be enhanced, but "he said that it should not be too strong, especially when cutting thick plates, the reaction heat generated by metal combustion increases, strengthening the preheating ability of the front edge of the cutting point. At this time, too strong preheating flame will seriously melt and collapse the upper edge of the incision. If the preheating flame is too weak, the steel plate will not get enough energy, forcing the cutting speed to be reduced, and even interrupting the cutting process. Therefore, the relationship between the strength of preheating flame and cutting speed is mutually restricted

generally speaking, cutting steel plates below 200mm with neutral flame can obtain better cutting quality. When cutting large thickness steel plates, the reduction flame should be used to preheat the cutting, because the flame of the reduction flame is relatively long, and the length of the flame should be at least 1.2 times of the plate thickness. (end)