Propezi Liquid Wire Drawing And Rolling Process Of Aluminum Wire
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Propezi liquid wire drawing and rolling process of aluminum wire
The process of rolling aluminum wire from aluminum raw material is directly followed by the casting process, so that the heat energy in the casting process can be used for hot rolling. Propezi liquid wire drawing came into being when high productivity and high production capacity were required, with a production rate of up to 12.5 t/h.
The molten aluminum is cast on a wheel according to the Propezi principle. The molten aluminum flows into the space between the trapezoidal grooves of the wheel and the endless rotating belt, where it solidifies. The production line is typically simple in design. The wheel diameter may be 2600 mm, and the cross-sectional area of the trapezoidal rod is 4400 mm². The completely solidified but still hot rod is fed into a hot rolling mill with multiple supports in series, where it is rolled into the required shape and size, for example, those alloy wires for electrical use may have diameters of 9.5 mm, 12.0 mm, 15.0 mm and 18.5 mm.
As soon as the aluminum bar leaves the casting wheel, it is first straightened and then cut into sections of a certain length. Then the burrs are removed and the surface is cleaned by sieving (planing) and brushing. The original hot rolling mill has 12 to 17 stands, each with 3 wheels arranged in a star shape, with an angle of 60° between every 2 stands, which can prevent widening. The triangle-triangle configuration and triangle-hexagon configuration are also very stable in practice, with an elongation of 1.09 to 1.30 per stand. This elongation is set by the gear ratio of the stand, because all stands are driven by the same motor. The internal tension must be kept very low. For stable operation, there is a formula: Vi*Ai=(1.0/1.03)*Vi-1*Ai-1
Here Ai is the cross-sectional area of the i-th stand and Vi is the speed of the stand. The use of emulsion for lubrication and cooling can keep the wear of the rotor and related parts and the oxidation of the raw material during rotation within a small range.
In the most recent equipment, the hot rolling mill is divided into a type of rolling mill, which consists of four independently rotating rollers with different horizontal and vertical rotation axes (mounted on 2 high racks), and is followed by 10-12 racks at the end. This makes it easier to adjust the machine in actual use to suit the needs of rolling special alloys. Heat conductors are installed upstream and downstream of the separation part of the machine, so that the metal temperature can be controlled and the temperature of the melt can be derived. A cooling stage may be added after the cleaning step. The aluminum wire is placed in a cooling container after continuous rolling to cool. In the most modern manufacturing processes, this cooling program can be adjusted at a certain stage to adapt to different alloys, different cross-stages and different speeds. The coil configuration is designed to be 3600kg/roll.
