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Preparation method of high-conductivity copper conductor for railway electric power continuous lines

A high-conductivity, copper-conductor technology, applied in conductors, conductive materials, conductive materials, etc., can solve problems such as difficulty in improving, and achieve the effect of improving conductivity, ensuring purity, and avoiding pollution

Inactive Publication Date: 2018-06-29
GENERAL RESEARCH INSTITUTE FOR NONFERROUS METALS BEIJNG +2
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

[0003] In order to overcome the bottleneck problem that it is difficult to improve the conductivity of copper conductors for railway power through-lines prepared by the up-casting + rolling / drawing process and continuous casting and rolling process, the present invention proposes a high-conductivity railway power through-wire Preparation method of copper conductor

Method used

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Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0023] Put the electrolytic ultra-pure copper plate into the electron beam melting furnace, vacuumize the furnace body and the gun chamber, and the vacuum of the gun chamber is 1.5×10 -4 Pa, the vacuum in the furnace is 1×10 -3 Pa; an ingot with a diameter of Φ200mm was obtained by electron beam smelting. Remove and polish the surface defects of the ingot, put it into a heating furnace protected by an inert gas such as argon, and heat it. When heated to 600 °C, hold it for 3.5 hours and then carry out water-sealing extrusion. The preheating temperature of the extrusion die is 500 °C. The speed is 100mm / s, one die has two outputs, the diameter of the extruded bar is 9mm, and the extrusion ratio is 247. The extruded bar is continuously extruded by water sealing on a continuous extruder, the rotation speed of the extruding wheel is 9r / min, and the extruded rod is extruded into a Φ3mm wire, and the extrusion ratio is 10. Then, it is drawn to Φ1.2mm on a multi-die drawing machine...

Embodiment 2

[0025] Put the electrolytic ultra-pure copper plate into the electron beam melting furnace, vacuumize the furnace body and the gun chamber, and the vacuum of the gun chamber is 2×10 - 4 Pa, the vacuum in the furnace is 1.1×10 -3 Pa; an ingot with a diameter of Φ250mm was obtained by electron beam smelting. Remove and polish the surface defects of the ingot, put it into a heating furnace protected by an inert gas such as argon, and heat it. When heated to 650°C, hold it for 4 hours and then perform water-sealing extrusion. The preheating temperature of the extrusion die is 500°C, and the extrusion speed is It is 80mm / s, one die has two outputs, the diameter of the extruded bar is 12mm, and the extrusion ratio is 217. The extruded bar is continuously extruded by water sealing on a continuous extruder, the rotation speed of the extruding wheel is 7r / min, and the extruded rod is extruded into a Φ6mm wire, and the extrusion ratio is 5.4. Then, it is drawn to Φ3mm on a multi-die ...

Embodiment 3

[0027] Put the electrolytic ultra-pure copper plate into the electron beam melting furnace, vacuumize the furnace body and the gun chamber, and the vacuum of the gun chamber is 2×10 - 4 Pa, the vacuum in the furnace is 1.1×10 -3 Pa; ingots with a diameter of Φ300mm were obtained by electron beam smelting. Remove and polish the surface defects of the ingot, put it into a heating furnace protected by an inert gas such as argon, and heat it. When heated to 700 °C, hold it for 4.5 hours and then perform water-sealing extrusion. The preheating temperature of the extrusion die is 500 °C. The speed is 60mm / s, one die has three outputs, the diameter of the extruded bar is 14mm, and the extrusion ratio is 153. The extruded bar is continuously extruded by water sealing on a continuous extruder, the rotation speed of the extruding wheel is 6r / min, and the extruded rod is extruded into a Φ6.8mm wire, and the extrusion ratio is 5. Then, it is drawn into Φ2.6mm on a multi-die drawing mac...

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Abstract

The invention relates to a preparation method of a high-conductivity copper conductor for railway electric power continuous lines, and belongs to the technical field of nonferrous metal conductor processing formation, copper alloy preparation and cable manufacturing. The method utilizes vacuum electron beam melting to purify a copper melt in order to greatly reduce the content of hydrogen, oxygenand nitrogen elements and eliminate oxides, nitrides and other inclusions, so ultrahigh purity and high cleanness of copper are achieved. One-mold and multiple-product water seal extrusion and water seal continuous extrusion are adopted to avoid oxidation pollution to the surface of the copper conductor in the hot working process, two-stage extrusion severe plastic deformation is performed to refine the microstructure and improve the plasticity of copper, and subsequent drawing processing is performed without annealing to make the total drawing deformation reach 75% or above. The highly-pure and highly-clean copper conductor for railway electric power continuous lines is obtained in the invention, has an oxygen content of below 5 ppm and a conductivity of 100.5 to phi 105% IACS.

Description

technical field [0001] The invention belongs to the technical fields of non-ferrous metal conductor processing and forming, copper alloy preparation and cable manufacturing, and relates to a preparation method of a high-conductivity copper conductor for railway power feed-through wires, in particular to a high-conductivity copper conductor for railway power feed-through wires. Preparation. Background technique [0002] The railway power feed-through line provides power for railway electrical loads including signal systems, production departments, stations, water supply systems, and living. Its power supply reliability directly affects the normal and safe operation of the railway transportation system, as well as the normal work of various railway departments. With the rapid development of railway systems, higher requirements are placed on the electrical conductivity of railway power feedthroughs. The copper stranded core is the conductor part of the railway power feed-throu...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): C21D1/26C21D9/52C22B9/22H01B1/02
CPCC22B9/228C21D1/26C21D9/52H01B1/026
Inventor 郭胜利李德富樊建中王斌晓赵鲁彬王亚彬王宁郑晓庆李成胤郑桂林
Owner GENERAL RESEARCH INSTITUTE FOR NONFERROUS METALS BEIJNG
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