Aluminum or aluminum alloy conductor twisting and compressing process for cables

Abstract

The invention provides an aluminum or aluminum alloy conductor twisting and compressing process for cables. The aluminum or aluminum alloy conductor twisting and compressing process comprises the following steps of: twisting aluminum or aluminum alloy single wires along the traction direction of the aluminum or aluminum alloy single wires; and compressing the twisted aluminum or aluminum alloy single wires by a compression roller, wherein a layer of twisting layer is formed after the aluminum or aluminum alloy single wires are twisted once and compressed by means of the compression roller, the subsequent twisting layer is twisted on the basis of the fore twisting layer, and the twisting direction of the last twisting layer is the same as that of the second last twisting layer. According to the aluminum or aluminum alloy conductor twisting and compressing process, the twisting directions of the outermost two layers of twisting layers are the same, the compression roller is combined with a nano diamond composite coating compression die, the phenomena of surface burrs of compressed round aluminum conductors, more aluminum scraps and wire fracture are prevented, the influence of alcohol which is continuously dripped for lubricating and cooling on the residual water inside or on the surface of the conductors is eliminated, the volume resistivity of the twisted and compressed cables is reduced by 0.5 to 2.0 percent, the production cost is saved, and the social benefit is higher.

Description

technical field [0001] The invention relates to a twisting and pressing process of aluminum or aluminum alloy conductors for cables, in particular to a round pressing process in which aluminum or aluminum alloy conductors for cables are combined with pressing rollers and nano-diamond composite coating pressing dies. Background technique [0002] At present, the twisting and compacting process of aluminum or aluminum alloy conductors for wire and cable is basically the same as that of copper conductors, especially the circular compacting process, which adopts regular concentric single-wire stranding and uses circular drawing dies. Pull out layered compaction process. This compacting process is very mature for copper conductors. After twisting and compacting, the surface is bright, burr-free, and precise in size; but for aluminum conductors, the mechanical properties and surface finish of aluminum monofilaments are much worse than copper monofilaments. , In addition, when a...

AI Technical Summary

Problems solved by technology

[0005] 1) It still adopts regular concentric single-wire stranding, and the stranding direction of each layer is opposite. This method will aggravate the mutual extrusion of the single wires to a certain extent, increase the irregular deformation of the single wires, and increase the conductor excessive The friction resistance of the circular compression drawing die, and to a certain extent, aggravated the internal grain breakage and lattice distortion of the aluminum wire, reducing its electrical conductivity;

[0006] 2) Adopt dripping alcohol lubrication and cooling process, because no matter how high the purity of alcohol is, the problem of water content cannot be avoided, and water staying inside or on the surface of the aluminum conductor will have a certain impact on product quality;

[0007] 3) The use of two circular compression drawing dies on the same stranded wire layer only solves the problem of repairing the broken wire of the aluminum conductor, and does not solve the problem of broken wire from the source, because only a single round pull wire is used mold, it is impossible to avoid wire breakage

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