Electric aluminum round billet rolling production process

1. Strictly control the chemical composition of aluminum liquid in the furnace The content of Fe and Si in the aluminum liquid composition increases, the resistivity increases, the tensile strength increases, and the elongation decreases. The content of Fe and Si decreases, the tensile strength decreases, and the elongation rate increases. Therefore, the content must be strictly controlled. In the selection of primary aluminum, Si is preferably not more than 0.08% and w(Fe)/w(Si)=1.5 to 2.0. Before the casting, the aluminum liquid is refined, and the powder refining agent is blown into the aluminum liquid by high-purity nitrogen gas. The refining agent should be evenly distributed into the aluminum liquid as much as possible to facilitate degassing and slag removal. 40 to 60 minutes. When necessary, add a proper amount of Al-Ti-B refiner to ensure the compactness of the cast slab and increase the internal structural quality of the cast slab.

2. Adding filtration device to the continuous casting ingot in the gating system, that is, placing two ceramic filter plates in the filter bag, placing them horizontally and placing them vertically, changing the original glass cloth filter to foam ceramic filter plate; using longer The flow cell minimizes the number of injections of molten aluminum; the nozzle changes from a tilt position equivalent to ten-and-a-half times to a horizontal position equivalent to twelve; and a conduit is used to conduct the flow between the flow cell and the tundish. In this way, the molten aluminum can smoothly enter the crystallization chamber without turbulence and turbulence, and the oxide film on the surface of the molten aluminum in the flow cell and the tundish is not broken, and the aluminum liquid is re-inhaled and oxidized to prevent the oxide film from entering the casting cavity. New slag inclusions are formed; the gating system adopts a new type of integral structure for knotting, and the refractory material is strong and durable, eliminating the secondary pollution of the molten aluminum by the refractory materials in the past. In the casting process, the three elements of casting temperature, casting speed and cooling conditions are strictly controlled. The temperature of the molten aluminum is generally controlled at 730°C to 740°C, the casting temperature is 700°C to 710°C, and the casting speed is 0.20 to 0.22m/s. At 0.1 to 0.3 MPa, the cooling water temperature is not higher than 40°C. 3, continuous rolling hot metal has a higher plasticity, low deformation resistance, so you can use less energy to get a larger deformation. The rolling speed, rolling temperature and process lubrication of the continuous rolling mill during rolling are the three elements that guarantee the quality of the aluminum rod. During rolling, the rolling parameters must be adjusted timely and reasonably according to the conditions of the casting slab to ensure the quality of the aluminum rod. Rolling Temperature Rolling temperature is too high will cause the low melting point of the internal melting of the billet resulting in overheating of the rolling piece, high temperature brittle fracture and sticky aluminum roll, aluminum rod surface scars; rolling temperature is too low, the billet deformation easily lead to plugging According to actual experience, it is appropriate to control the ingot billet temperature at 480-520°C before rolling. Rolling speed Rolling speed directly affects the production efficiency and mechanical properties of aluminum rods. Under the condition that the chemical composition of the aluminum rod and the production cooling conditions are constant, when the rolling speed is high, the thermal effect is large, hot brittleness occurs, the tensile strength of the aluminum rod is reduced, the rolling piece is easy to break, and the aluminum rod resistance is low when the rolling speed is low. Tensile strength increases, but the rolling effect is not good. Generally, the rolling speed is controlled at 0.18~0.22m/s, and the final rolling speed is controlled at about 6m/s.

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