Copper-magnesium alloy strand production process thereof

Abstract

A twisted CuMg alloy wire used as the messenger cable and sling of contact network for electrified railway contains Cu (greater than 99%) and Mg (0.45-0.55%), and is made through smelting CuMg alloy to prepare intermediate alloy, smelting intermediate alloy, conticasting to obtain rod blank, cold rolling, drawing, rewinding and twisting. Its advantages are high strength, small cross-section area, light weight, and high current carrying performance, over load power, thermal stability and elasticity.

Description

Technical field: [0001] The invention relates to a copper-magnesium alloy stranded wire and a production process thereof. Applied to high-speed electrified railway catenary as catenary cable and suspension string. Background technique: [0002] At present, in the electrification construction of railways, the current-carrying force cables and hanging strings are made of galvanized iron wire, some are made of aluminum-clad iron (steel) wire, some are made of copper-clad steel, and some are made of hard pure copper. make. They each have many shortcomings. Now it is described as follows: [0003] 1. The stranded wire is made of galvanized wire. The galvanized layer is easily corroded and rusted in the atmosphere. , Workers need to work suspended in the air, therefore, the labor intensity of replacement and maintenance is high, the maintenance cost is high, and the conductivity is also poor, which affects the safe operation of the train. has been gradually eliminated. [00...

AI Technical Summary

Problems solved by technology

However, there are also problems such as poor mechanical properties of aluminum and poor corrosion resistance in alkaline or acidic environments. In order to prevent electrochemical corrosion between copper and aluminum, the contact network structure is complicated and other problems affect its use.

[0005] 3. Copper-clad steel wire is used to make stranded wire. Although it has high tensile strength, the elasticity of the load-bearing cable is poor, and the surface hardness of the single wire is low. During the construction and setting-out process, the phenomenon of copper scraping and steel leakage is easy to occur. Partial discharge during overcurrent

Therefore, it also affects its normal use

[0006] 4. Copper stranded wire made of hard pure copper has poor mechanical strength and thermal dynamic impact resistance, so it is necessary to use a stranded wire with a larger cross-section and poor corrosion resistance.

The large cross-section copper stranded wire is heavy in weight, high in cost, poor in elasticity, low in strength, low in allowable operating temperature, poor in current carrying performance, small in overload capacity, and poor in thermal stability.

It is difficult to adapt to the requirements of the catenary of the high-speed electrified railway as the suspension string of the catenary cable

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