Preparation method of molded line used for stranded conductor

Abstract

The invention relates to the improvement of the preparation method of the molded line used for a transmission stranded conductor, and is characterized by comprising the following steps: firstly reducing deformation by multiple round broaching; carrying out normal temperature roll to form a molded line with a needed shape when approximating to the area of the needed molded line; and finally carrying out one molded line mold reforming. The invention realizes the optimal process combination of preparing molded line conductor in batch, the wire breaking frequency is greatly reduced, fundamentally no broken wire exists in the experiment, the production rate is high, and the efficiency is high, the production efficiency can be increased by at least more than 20%. In the same way, when aluminum ladder-shaped or Z-shaped molded lines are prepared, the production rates can respectively reach 11 m / s and 9-10 m / s; the prepared molded line has good surface quality, no burr, bright and clean large-length surface and no defects of hemmed edge, crackle, rag, delamination and the like, not only can save equipment investment, but also can save preparation energy consumption.

Description

technical field [0001] The invention is an improvement to a method for preparing a molded wire for a stranded conductor for power transmission, and relates to a method for preparing a molded wire conductor with high production efficiency, low wire breakage and good surface quality of the obtained conductor. Background technique [0002] In order to reduce the outer diameter of the stranded conductor and increase the filling factor of the stranded conductor, one method is to use non-circular wire conductors to twist. Shaped wires for stranded conductors for power transmission are basically copper or aluminum with good plasticity. Due to their relatively good plasticity and relatively thin diameter (usually no more than 5mm in diameter), the industry is used to drawing with multi-pass special-shaped molds. Formed wire conductors are obtained by step-by-step deformation, that is, copper rods or aluminum rods are deformed step by step through multi-pass (usually 7-10) special-sh...

AI Technical Summary

Problems solved by technology

Shaped wires for stranded conductors for power transmission are basically copper or aluminum with good plasticity. Due to their relatively good plasticity and relatively thin diameter (usually no more than 5mm in diameter), the industry is used to drawing with multi-pass special-shaped molds. Formed wire conductors are obtained by step-by-step deformation, that is, copper rods or aluminum rods are deformed step by step through multi-pass (usually 7-10) special-shaped molds to form the required shape. Wire conductors, unchanged so far

Because the copper or aluminum used to draw the conductor has high purity in order to improve the electrical conductivity, but its tensile strength is low (much lower than steel), and it is drawn with a thin diameter. In order to prevent the drawing deformation For breaking, the deformation amount of each pass must be controlled. Usually, the deformation area ratio of each die is set at 1.15-1.2 times, resulting in more deformation and drawing passes, and it cannot be drawn with high strength (high strength is easy to break). Furthermore, due to the unequal deformation around the shape conductor deformation, it is also easy to cause wire breakage in the drawing process, and it is difficult to pass through the mold after the wire breakage, so the drawing speed is slower and the production efficiency is lower. Trapezoidal or Z-shaped Take aluminum profile wire as an example, the drawing speeds are only 5 m / s and 2-3 m / s respectively; secondly, due to uneven deformation, a large amount of metal swarf accumulates at the mouth of the drawing die, causing the surface of the drawn profile to easily appear. Burrs and roughness not only affect the performance and appearance of the conductor, but also easily cause broken wires during drawing, which will increase corona and increase transmission power consumption during use; moreover, the number of drawing passes is not only low in production efficiency, but also in the preparation high energy consumption

In addition, uneven deformation can easily lead to wear of the drawing die, and the manufacturing cost of the special-shaped drawing die is relatively high, which also increases the drawing cost

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