Method for preparing contact wires and pole blanks

A technology for contacting wires and wire rods, which is applied in the direction of metal rolling, manufacturing extensible conductors/cables, root rods/rods/wires/strip conductors, etc., and can solve the problem of large volume and weight of the entire rod blank and long contact wires. , expensive and other issues, to achieve the effect of simplifying heat treatment, maintaining electrical conductivity, and good physical properties

Active Publication Date: 2009-06-03
CHINA RAILWAY CONSTR ELECTRIFICATION BUREAUGRP
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  • Abstract
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AI Technical Summary

Problems solved by technology

[0005] At present, although precipitation-strengthened copper alloy materials have been widely used in metallurgy and other industrial fields, they have not yet been practically applied to railway contact wires. The reason is that the contact wires are longer, so that the volume and weight of the whole rod blank are larger; The requirements for smelting equipment are very high, and the oxidation of alloy elements must be prevented; large-volume billets are not easy to be heated uniformly during solid melting, and the solid-melting effect is poor; large-volume copper alloy solid-melting furnaces are expensive

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  • Method for preparing contact wires and pole blanks

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preparation example Construction

[0026] Such as figure 1 as shown, figure 1 It is a schematic flow chart of the preparation method of the contact wire according to the present invention, which may specifically include the following steps:

[0027] Step 101: Smelting copper alloys (for example, copper-chromium-zirconium alloys, copper-silver-chromium alloys, etc.); various appropriate smelting methods can be used, and the content of impurities such as oxides should be as low as possible.

[0028] Step 102: preparing an oxygen-free casting rod; the oxygen-free casting rod can be prepared by means of vacuum melting method, shielding gas melting method, upward continuous casting or horizontal continuous casting.

[0029] Step 103: pretreatment; performing necessary cleaning or diameter reduction on the anaerobic cast rod.

[0030] Step 104: sending the billet rod into the extrusion machine for continuous hot extrusion, and rapidly cooling the extruded contact wire rod billet. The as-cast structure of the alloy...

Embodiment 1

[0036] 1) Non-vacuum melting copper-chromium-zirconium alloy. Copper-chromium alloy and copper-zirconium alloy are added in the form of master alloy. In the furnace, chromium element accounts for 0.6% of the total weight, zirconium accounts for 0.1%, magnesium accounts for 0.05%, and the rest is copper. Argon protection.

[0037] 2) Horizontal continuous casting to prepare oxygen-free casting rods.

[0038] 3) Clean the surface of the billet rod.

[0039] 4) Send the connected billet rods into the Kangfu extruder for continuous hot extrusion and cooling to obtain the contact wire rod billet.

[0040] 5) The billet is cold-rolled with a deformation of 45%.

[0041] 6) Carry out aging treatment at a temperature of 550° C. and keep warm for 2 hours.

[0042] 7) Cold drawing forming, multi-pass cold drawing according to the cross-sectional size of the contact wire, the deformation amount is 50%, and the tensile strength of the contact wire can reach more than 580MPa, and the e...

Embodiment 2

[0044] 1) Non-vacuum melting copper-silver-chromium alloy. Among them, the copper-chromium alloy is added in the form of an intermediate alloy, and the chromium element in the furnace accounts for 0.6% of the total weight, silver accounts for 0.1%, magnesium accounts for 0.05%, and the rest is copper.

[0045] 2) Horizontal continuous casting to prepare oxygen-free casting rods.

[0046] 3) Clean the surface of the billet rod.

[0047] 4) Send the connected billet rods into the Kangfu extruder for continuous hot extrusion and cooling to obtain the contact wire rod billet.

[0048] 5) The billet is cold-rolled with a deformation of 45%.

[0049] 6) Carry out aging treatment at a temperature of 480° C. and keep warm for 2 hours.

[0050] 7) Cold drawing forming, multi-pass cold drawing according to the cross-sectional size of the contact wire, the deformation amount is 45%, and the tensile strength of the contact wire can reach more than 580MPa, and the conductivity can reach...

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Abstract

The invention discloses a method for preparing high-strength high-conductivity contact wires and rod blanks. The method for preparing the contact wires comprises the following steps: melting and continuously casting to obtain precipitation strengthening type copper alloy oxygen-free wire rods; pre-treating the oxygen-free wire rods to obtain blank rods; loading the blank rods into an extruding machine to carry out continuous hot extrusion to obtain contact wire rod blanks, and cooling the extruded contact wire rod blanks; cold-rolling the contact wire rod blanks, and carrying out the aging treatment; and carrying out the multi-pass cold rolling to the contact wire rod blanks according to the pre-determined sectional dimension of the contact wires to obtain the contact wires. The method simplifies the problem of the heat treatment of the precipitation strengthening type copper alloy contact wire materials, the prepared contact wires have the advantage of fine grains, thereby not only ensuring higher mechanical strength, but also retaining ideal conductivity and good physical properties, and the length of the contact wires can meet the requirements for railway construction.

Description

technical field [0001] The invention relates to the technical field of power supply wires, in particular to a method for preparing a contact wire and a rod blank. Background technique [0002] Electrified railway contact wire is one of the power supply wires used in the worst working environment, and its performance directly affects the safe operation of high-speed trains. The high-speed railway contact wire has a large rated working tension, and is constantly impacted and rubbed by the pantograph during long-term operation, and needs to endure arc ablation, temperature changes and the influence of the environment. In this case, the contact wire is required to have high tensile strength, wear resistance, corrosion resistance, good high temperature softening resistance, and good electrical conductivity for energy saving requirements. These are only the required material properties of the wire itself. In practical application, issues such as wire production cost, large-lengt...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): H01B13/008H01B5/02B21C23/02B21B1/16B21C1/02
Inventor 张曙光郑斌王祖峰周力寇宗乾李学斌万传军孟宪浩侯晓俊张强
Owner CHINA RAILWAY CONSTR ELECTRIFICATION BUREAUGRP
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