A kind of preparation method of aluminum alloy trapezoidal conductor

Abstract

The invention provides a method for preparing an aluminum alloy trapezoidal conductor, which includes a drawing step: using a non-sliding wire drawing machine to draw a trapezoidal single wire, using an aluminum alloy rod as the wire to release the wire, and sequentially drawing the trapezoidal single wire through each drawing group , the trapezoidal single wire is wound up by the coil. It also includes a stranding step: using a frame-type stranding machine to strand the trapezoidal conductor; during the stranding process of the frame-type stranding machine, the trapezoidal single wire passes through the orientation plate to ensure that the center line of the trapezoidal single wire faces the core wire, and then the trapezoidal single wire is pre-twisted. The twisting direction is opposite to the rotating direction of the frame stranding machine, and then each trapezoidal single wire and the core wire meet at the forming device to complete the twisting and form a stranded wire. The trapezoidal single wire drawn by this method has a stable structure, smooth and clean surface, and is not easy to break during the drawing process. The twisted trapezoidal conductor has less torsional stress and has better surface quality because it does not need to be pressed tightly, and the filling factor can reach more than 0.96.

Description

technical field [0001] The invention relates to the field of cable conductor manufacturing, in particular to a method for preparing an aluminum alloy trapezoidal conductor. Background technique [0002] The good mechanical and electrical properties of aluminum alloy power cables make it widely used in various fields of the national economy, such as ordinary residential buildings, high-rise buildings, elevators, large and small supermarkets, subways, etc., and can also be used in metallurgy, Steel, coke, coal mine, aerospace, military, paper and other industries. [0003] At present, the vast majority of aluminum alloy cable conductors are twisted by round aluminum alloy single wires, and there is a large gap between the formed conductor wires, which increases the outer diameter of the product and wastes the extruded around the conductor. Plastic, which reduces the bending performance of the conductor and affects the electrical properties of the conductor surface. Such as ...

AI Technical Summary

Problems solved by technology

[0003] At present, the vast majority of aluminum alloy cable conductors are twisted by round aluminum alloy single wires, and there is a large gap between the formed conductor wires, which increases the outer diameter of the product and wastes the extruded around the conductor. Plastic, which reduces the bending properties of the conductor and affects the electrical properties of the conductor surface

like figure 1 and figure 2 As shown, a small part of the trapezoidal conductor 6 of the aluminum alloy cable is formed by twisting the trapezoidal single wire 12 around the central round wire 40. Since the trapezoidal single wire 12 is a special-shaped wire, it is a trapezoid with a small arc surface 121 and a large arc surface 122. The process changes from circular to trapezoidal, resulting in poor surface quality and easy wire breakage, torsional stress will be generated during the stranding process, resulting in unstable structure, requiring compaction or annealing

[0004] The utility model patent with the application number 201420040683.9 describes a stranding machine. Using this stranding machine to strand a trapezoidal conductor will result in excessive stranding clearance and internal stress due to the reversal of the core angle when the trapezoidal conductor enters the forming device. The problem of too large, so a compression device is needed to further apply force to the twisted wire, but this will cause the deformation of the trapezoidal single wire, resulting in a decrease in the breaking force of the single wire

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