Fire adjustment techniques and commonly used gases for CNC flame cutting machines
The CNC flame cutting machine is a kind of large-thickness plate cutting equipment that is currently more commonly used. However, due to the characteristics of flame cutting, the cutting quality often fails to meet the standard. This is actually related to the adjustment of the cutting machine. Normally, as long as the flame is adjusted correctly, The cutting quality can be guaranteed. The following is a compilation of the flame adjustment techniques and common gases of the CNC flame cutting machine for your reference.
1. Commonly used gas for adjusting the flame of CNC flame cutting machine
The fire adjustment of the CNC flame cutting machine mainly relies on the combustion gas, mainly oxygen, acetylene, coal gas, natural gas, etc., and the specific fire adjustment method is to adjust their ratio. Oxygen is necessary for the combustion of combustible gas in order to achieve The ignition temperature of the steel provides the required energy; in addition, oxygen is necessary for the combustion of the steel after it has been preheated to the ignition point. Among other commonly used flammable gases, some manufacturers will use MAPP, namely: methane + ethane + propane.
Generally speaking, gas with fast burning speed and high burning value is suitable for thin plate cutting; combustible gas with low burning value and slow burning speed is more suitable for thick plate cutting, especially steel plates with a thickness of 200mm or more, such as gas or natural gas When cutting, the ideal cutting quality will be obtained, but the cutting speed will be slightly reduced. In comparison, acetylene is much more expensive than natural gas. However, due to resource issues, acetylene gas is generally used in actual production. It is only considered when cutting large and thick plates while requiring high cutting quality and sufficient resources. Use natural gas.
Cutting 300m thick flame cutting machine (for wind power)
2. Fire adjustment skills of CNC flame cutting machine
The adjustment of the flame of the CNC flame cutting machine is mainly realized by controlling the low pressure oxygen valve and the acetylene valve. In the face of different thicknesses, adjusting the ratio of oxygen to acetylene will choose different flames, mainly neutral flame, reducing flame and oxidizing flame , And the neutral flame and reducing flame are mainly used for cutting, because the size of these two flames can meet the cutting energy of the plate, and the oxidizing flame cannot meet the cutting requirements due to the short length and low energy.
1, the adjustment of cutting plates below 200mm
The neutral flame is mainly used when cutting plates below 200mm. Because the neutral flame oxygen and acetylene are fully combusted, the inner flame has a certain degree of reducibility and can obtain better cutting quality. The ratio of oxygen to acetylene is 1:1.2. The main trick is to bring the neutral flame to the lower limit, and the temperature of the neutral flame is higher at this time.
2, the adjustment of cutting large thickness steel plate
When cutting large-thickness steel plates, the reduction flame is generally used for preheating cutting, because the reduction flame contains free carbon and excessive hydrogen, and the flame is relatively long, which can achieve the purpose of cutting thick plates. The adjustment technique is to use The ratio of oxygen to acetylene is less than 1, and the flame length is at least 1.2 times the plate thickness.
3, adjustment of preheating flame
The size of the preheating flame seriously affects the cutting speed and cutting quality. The preheating flame is too weak to get enough energy for the steel plate, and the cutting speed is forced to reduce, even causing the cutting process to be interrupted; if the preheating flame is too strong, the reaction heat generated by the metal combustion increases, and the preheating ability of the cutting point front Strengthening will severely melt and collapse the upper edge of the incision, especially for cutting thick plates. The relationship between the strength of the preheating flame and the cutting speed is mutually restricted. As the thickness of the workpiece to be cut increases and the cutting speed increases, the flame should also increase with the increase of the plate thickness.
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