来源：http://www.bahaihub.com 发布时间：2019-12-03 14:39:33
Aluminum alloy profiles such as aluminum alloy plates must have enough high temperature during melting to ensure that metal elements such as aluminum alloy plates are completely melted and dissolved. If the heating temperature is too high, the melting speed will be accelerated, which shortens the time of harmful interaction between metal, furnace gas and furnace lining. The production practice shows that rapid heating speeds up the melting of the furnace charge, shortens the melting time, and improves the production efficiency and quality.
But on the other hand, it is easy to overheat when the temperature is too high, especially when the flame reflecting furnace is used for heating, the gun body directly contacts the furnace charge, and with the strong heat added to the molten or semi molten metal, it is easy to cause the gas to melt into the human body. At the same time, the higher the temperature is, the faster the metal reacts with furnace gas and lining, which will lead to the loss of metal and the decrease of melt quality. Overheating will not only absorb a lot of gas, but also make the solidified ingot grain structure coarser, increase the tendency of ingot crack, and affect the properties of the alloy. Therefore, in the melting process, the melting temperature should be well controlled to prevent the melt from overheating.
But low melting point is meaningless in practice. Therefore, in actual production, it is not only necessary to prevent the melt from overheating, but also to accelerate the melting of the melt and shorten the melting time of the melt. The control of melting temperature is very important. Most factories adopt rapid smelting after fast feeding at high temperature, which makes the semi-solid and semi-liquid metal exposed to strong furnace gas and flame in a short time, reduces the oxidation and combustion loss of metal, and reduces the suction of melt. When a layer of liquid metal appears after the furnace charge is calcined, in order to reduce the local overheating of the melt, the melt temperature should be appropriately reduced, and the stirring should be strengthened in the smelting process to promote the heat transfer of the melt. In particular, it is necessary to control the melting temperature of the R charge which is about to melt completely. Because metal or alloy has latent heat of melting, the temperature will rise when all the charges melt. If the melting temperature is controlled too high, the metal in the whole molten pool will overheat. In production practice, the main reason for melt overheating is improper temperature control.
The actual melting temperature should be selected according to the melting temperature of alloy elements such as aluminum plate. Different alloys have different melting points, i.e. for alloys with different compositions, the temperature at which the solid starts to melt (called solid temperature) and the temperature at which the solid completely melts (called liquid temperature) are also different. In both temperature ranges, metals are semi-liquid and semi-solid.
The above is the temperature control of aluminum alloy plate in melting process shared by the aluminum coil manufacturer. For more information, please visit http://www.jndclyxgs.com