Method for preparing aluminium alloy trapezoidal conductor

Abstract

The invention provides a method for preparing an aluminium alloy trapezoidal conductor, and includes: a drawing step in which a non-sliding wire drawing machine to draw trapezoidal single wires, uses an aluminium alloy rod material as wires to perform paying off, the aluminium alloy rod material passes through each drawing group in sequence and is drawn into trapezoidal single wires, and the trapezoidal single wires are rolled by a wire coil; a stranding step in which a frame type stranding machine is used to strand a trapezoidal conductor, in a stranding process of the frame type stranding machine, a center line of the trapezoidal single wires is guaranteed to be toward a core wire through a directional disc, then the trapezoidal single wires are pre-twisted, a pre-twisting direction is opposite to a rotation direction of the frame type stranding machine, and then each trapezoidal single wire and the core wire converge in the position of a molding device, thereby completing stranding, and forming a stranded conductor. The trapezoidal single wires drawn according to the method have stable structures and smooth and clean surfaces, and wires are not easy to break in a drawing process. The trapezoidal conductor formed by stranding has relatively small torsional stress, and has relatively good surface quality since compacting treatment is not needed, and a filling coefficient can be higher 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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