Low tin-copper alloy contact wire for electric railway and manufacturing method thereof

A technology for electrifying railways and tin-copper alloys, which is used in cable/conductor manufacturing, electrical components, metal/alloy conductors, etc., to achieve the effects of low production cost, good machinability and high softening temperature

Active Publication Date: 2011-06-08
沈阳北恒新材料有限公司
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

At present, copper-silver alloy contact wires are mainly used to meet the normal speed of electrified railways in China, but because of their high production costs, poor machinability, and short service life, they are no longer in line with the current national policy of building a conservation-oriented society.

Method used

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  • Low tin-copper alloy contact wire for electric railway and manufacturing method thereof

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Experimental program
Comparison scheme
Effect test

Embodiment 1

[0029] Low-tin-copper alloy contact wire for electrified railways and its manufacturing method:

[0030] A low-tin-copper alloy contact wire billet rod with a diameter of φ28mm is produced by continuous casting and rolling process. Wherein the tin is added to the upper part of the downflow tank with a quantitative adding device with a diameter of φ6mm. Finally, after hot rolling, the section will be 2300mm 2 The cast bar is hot-rolled into a Φ28mm billet rod, and its hot-processing passes can be 4 to 8 times, and the pass processing rate is 18.5-23.5% per pass, the total hot-working rate is 73.26%, and the hot-rolling temperature is 750-830 ℃, the grain size is 0.015-0.018mm, hot rolling is enough to change the as-cast grain size of the alloy metal, but it lays a good foundation for the subsequent cold working rate to improve the performance index.

[0031] Put high-purity cathode copper into the vertical melting furnace, the fuel is natural gas, control the temperature of t...

Embodiment 2

[0035] Add 35 tons of high-purity cathode copper to the vertical melting furnace. When the temperature of the holding furnace rises to 1140°C to 1150°C, the atmosphere in the furnace is guaranteed to be slightly reduced, and production begins. The molten liquid metal flows into the ladle continuously through the lower chute, and metal tin wire is added in the lower chute at a weight percentage of 0.097% by wire feeding method, and the amount added is synchronized with the casting speed. Sampling and analysis showed that casting and rolling started after the tin content was qualified. The temperature of the ladle was controlled at 1100-1120°C, the casting speed was 750rpm, and the cooling water pressure was 0.08-0.25Mpa. After cooling and solidification, the billet was formed. The casting cross-section was trapezoidal. Cross-sectional area 2300mm 2 . The casting slab is sent into a rolling mill with a running speed of 750rpm for four consecutive rolling passes, and the rolling...

Embodiment 3

[0037] A low-tin-copper alloy contact wire billet rod with a diameter of φ28mm is produced by continuous casting and rolling process. Wherein the tin is added to the upper part of the downflow tank with a quantitative adding device with a diameter of φ6mm. Finally, after hot rolling, the section will be 2300mm 2 The hot-rolled cast bar is Φ28mm billet rod, the number of hot-working passes is 4-8 times, the processing rate of each pass is 18.5-23.5%, the total hot-working rate is 73.26%, and the hot-rolling temperature is 750-830°C. The grain size is 0.015 ~ 0.018mm. Hot rolling is enough to change the as-cast grain size of the alloy metal, but it lays a good foundation for the subsequent cold working rate to improve the performance index.

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Abstract

The invention relates to a low tin-copper alloy contact wire for an electric railway, which is a tin-copper alloy comprising the following components in parts by weight percent: 0.06-0.97% of tin, less than or equal to 0.10% of impurities and balance of copper. In the manufacturing method of the invention for protecting the low tin-copper alloy contact wire, cast bars the sectional areas of whichare 2300mm<2> are used as initial raw materials, and the cast bars are machined by hot rolling for 4-12 times to obtain intermediate blank rods the diameters of which are 25-32mm; the machining rate in each time is 12-25%; and the low tin-copper alloy contact wire comprises the following materials in parts by weight percent: 0.06-0.08% of tin, less than or equal to 0.10% of impurities and the balance of copper. The low tin-copper alloy contact wire fills up the domestic blank, has excellent comprehensive performance indexes and has better economic value and social value.

Description

technical field [0001] The invention relates to non-ferrous metal processing design and processing technology, in particular to a low-tin-copper alloy contact wire for electrified railways and a manufacturing method thereof. Background technique [0002] Today, my country's electrified railway construction has entered a period of rapid development. At present, copper-silver alloy contact wires are mainly used to meet the normal speed of electrified railways in China, but because of their high production costs, poor machinability, and short service life, they are no longer in line with the current national policy of building a conservation-oriented society. [0003] People expect to obtain a low-tin-copper alloy contact wire for electrified railways with better technical effects and a manufacturing method thereof. Contents of the invention [0004] The object of the present invention is to provide a low-tin-copper alloy contact wire for electrified railway and its manuf...

Claims

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): H01B1/02H01B5/02H01B13/00B60B1/12C22C9/02
Inventor 张敏陈绍华逯富君青木明王恒波李玉刚罗兴盛付坚
Owner 沈阳北恒新材料有限公司
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