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Copper-chromium-zirconium alloy contact wire and production technique thereof

A production process and contact wire technology, applied in the direction of metal/alloy conductors, conductive materials, conductive materials, etc., can solve the problems of difficulty in meeting the high strength and high conductivity requirements of catenary wires, and the inability to continuously produce rods.

Active Publication Date: 2018-02-27
CENTURAY TECH CO LTD
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

High-strength copper-magnesium alloy contact wire is the most widely used product for high-speed electrified railways, but affected by the strengthening mechanism of copper-magnesium alloy, its tensile strength and electrical conductivity are inversely proportional, so copper-magnesium alloy contact wire will be difficult to meet the increasing The development of electrified railways requires high-strength and high-conductivity catenary wires
[0004] Most traditional copper-chromium-zirconium alloys use large-diameter ingots for horizontal extrusion. Due to the limitation of the size of the extrusion cylinder, the weight of a batch of rods can only be controlled within 200 kg, and it is impossible to continuously produce materials that meet the production length of the contact line. Rods (the production length of the contact wire is determined by the anchor section of the station line, and the required weight of a single rod is mainly concentrated in the range of 1-2 tons), and the conductivity of the contact wire produced by the above-mentioned rods is usually concentrated at about 70% IACS, and the tensile strength The strength is usually less than 500MPa, which is difficult to meet the needs of today's rapid development of electrified railways

Method used

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  • Copper-chromium-zirconium alloy contact wire and production technique thereof

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Experimental program
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Effect test

Embodiment 1

[0032] a. raw material preparation;

[0033] b. Upward continuous casting: using cathode copper plate, copper-chromium master alloy and copper-zirconium master alloy as raw materials for upward continuous casting, the temperature of copper liquid is controlled at 1200-1300°C, the single root speed is controlled at 100kg / h, and the cooling water of the crystallizer enters and exits The water temperature difference is 8-10°C, the diameter of the upper casting rod is 25mm, where ω(Cr)=0.72%, ω(Zr)=0.06%;

[0034] c. CONFORM continuous extrusion: tooling mold and preheating material preheating temperature 650 ℃, heat preservation 2h, extrusion gap controlled at 0.6mm, extrusion ratio controlled at 2.6, extrusion rod diameter 36mm, rod billet feed line speed controlled at 5m / min;

[0035] d. The first cold processing: use cold rolling equipment or drawing equipment to cold-roll the above-mentioned 36mm extruded rod to 28mm, the total cold processing amount> 40%, take up the w...

Embodiment 2

[0043] a. raw material preparation;

[0044] b. Upward continuous casting: use cathode copper plate, pure chromium, and pure zirconium as raw materials for upward continuous casting. The temperature of copper liquid is controlled at 1300-1400°C, and the single lead speed is controlled at 80kg / h. Ensure that Cr and Zr elements are evenly dissolved into the copper matrix. The temperature difference between the inlet and outlet of the crystallizer cooling water is 8-10°C. The diameter of the upward casting rod is 30mm. It is covered with graphite particles or graphite flakes. The thickness of the covering agent is greater than 15mm. Pass inert gas protection to avoid contact between copper water and air, where ω(Cr)=0.68%, ω(Zr)=0.07%;

[0045] c. CONFORM continuous extrusion: the preheating temperature of tooling mold and preheating material is 650℃, heat preservation for 2h, the extrusion gap is controlled at 0.6mm, the extrusion ratio is controlled at 2.6, the diameter of t...

Embodiment 3

[0054] a. raw material preparation;

[0055] b. Upward continuous casting: use cathode copper plate, pure chromium, and pure zirconium as raw materials for upward continuous casting. The temperature of copper liquid is controlled at 1300-1400°C, and the single root speed is controlled at 70kg / h. Ensure that Cr and Zr elements are evenly dissolved into the copper matrix. The temperature difference between the inlet and outlet of the crystallizer cooling water is 8-10°C. The diameter of the upward casting rod is 20mm. It is covered with graphite particles or graphite flakes. The thickness of the covering agent is greater than 15mm. Pass inert gas protection to avoid contact between copper water and air, where ω(Cr)=0.15%, ω(Zr)=0.01%;

[0056] c. CONFORM continuous extrusion: tooling mold and preheating material preheating temperature 500 ℃, heat preservation 2h, extrusion gap is controlled at 0.4mm, extrusion ratio is controlled at 1.8, extrusion rod diameter is 40mm, rod bi...

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Abstract

The invention discloses a copper-chromium-zirconium alloy contact wire and a production technique thereof. The copper-chromium-zirconium alloy contact wire is composed of copper, chromium, zirconium and inevitable impurity elements according to the set mass percentages. In preparation, the main technique comprises the steps of raw material preparation, up-drawing continuous casting, CONFORM continuous squeezing, primary cold machining, solution treatment, secondary cold machining, aging treatment and finished product drawing. According to the copper-chromium-zirconium alloy contact wire manufactured by the technique and materials, the matching of the contact wire raw materials is reasonably adjusted, the ratio of all element components in the contact wire is adjusted, and the special production technique is combined so that a high-strength high-conductivity contact wire product can be produced, wherein the weight of one single contact wire product is larger than two tons, the IACS electrical conductivity of the contact wire product is 75-90%, and the tensile strength of the contact wire product is 550-700 MPa; and the requirement of current electric railway high-speed development can be better met.

Description

technical field [0001] The invention relates to the technical field of electric cables, in particular to a copper-chromium-zirconium alloy contact wire and a production process thereof. Background technique [0002] With the rapid development of electrified railways, the requirements for catenary wire are getting higher and higher. It is required that the catenary wire has high strength and high conductivity at the same time. The high strength of the wire can increase the safety and stability of the train operation, and the high conductivity can save the loss of electric energy during transmission. [0003] At present, the contact wires used in electrified railway catenary mainly include four materials: pure copper, copper-silver alloy, copper-magnesium alloy, and copper-tin alloy. Among them, the conductivity of pure copper contact wire and copper-silver alloy contact wire is 97%IACS, and the tensile strength range is 350-380MPa, which are mostly used in subway projects; ...

Claims

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Application Information

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IPC IPC(8): C22C9/00C22C1/03C22F1/08H01B1/02
CPCC22C1/03C22C9/00C22F1/002C22F1/08H01B1/026
Inventor 金良赞詹国立刘科杰赵金伦宋卫星
Owner CENTURAY TECH CO LTD
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