For the flame cutting machine to achieve a good cutting effect, the adjustment of fire is very important. So how should the flame cutting machine make fire? Let's talk about how to adjust the fire today. In general, when using the flame cutting method, three cutting flames can be obtained by adjusting the ratio of oxygen and acetylene: neutral flame (ie, normal flame), oxidizing flame, and reducing flame.
The normal flame is characterized by the absence of free oxygen and activated carbon in its reduction zone. There are three distinct areas. The flame core has a sharp outline (close to a cylindrical shape). The composition of the flame core is acetylene and oxygen, and its ends have a uniform circular shape and a bright shell. The shell consists of red hot carbon dots. The temperature of the flame core reaches 1000°C. The reduction zone is outside of the flame core, and the apparent difference from the flame core is its darker brightness. The reduction zone consists of products of incomplete combustion of acetylene, carbon monoxide and hydrogen. The temperature in the reduction zone can reach around 3000°C. The outer flame is the complete combustion zone, located outside the reduction zone. It consists of carbon dioxide, water vapor, and nitrogen, and its temperature varies from 1200 to 2500°C.
The oxidizing flame is produced under the condition of excess oxygen. The flame core is conical, its length is obviously shortened, the outline is not clear and its brightness is dim; similarly, the reduction zone and the outer flame are also shortened and the flame is purple blue. , Accompanied by the sound of burning, the size of the sound and oxygen pressure, oxidation flame temperature is higher than the normal flame. If an oxidizing flame is used for cutting, the cutting quality will be significantly deteriorated.
The reduction flame is produced in excess of acetylene. The flame core has no obvious outline. The flame core has green edges at the end. Judging from this green edge, there is excess acetylene; the reduction area is unusually bright and almost The flame core is mixed; the outer flame is yellow. When too much acetylene is left, black smoke begins to occur because of the lack of oxygen necessary for acetylene burning in the flame.
The energy of the preheating flame is closely related to the cutting speed and incision quality. As the thickness of the workpiece is increased and the cutting speed is increased, the energy of the flame should also be enhanced, but it must not be too strong, especially when the thick plate is cut, the reaction heat generated by metal combustion increases, and the cutting is strengthened. Point the front of the preheating ability, then, a strong preheating flame will make the upper edge of the incision severe melting edge collapse. Too weak a preheating flame will make the steel plate not get enough energy, forcing the cutting speed to be reduced, or even causing the cutting process to be interrupted. Therefore, the relationship between the strength of the preheating flame and the cutting speed is mutually restricted.
In general, the use of a neutral flame for cutting steel sheets up to 200 mm gives better cutting quality. In the cutting of large thickness steel plates, the reduction flame should be used to preheat and cut because the flame of the reducing flame is longer and the length of the flame should be at least 1.2 times the thickness of the plate. This will make your cut better.
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