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Continuous rapid annealing process for brass-coated pure copper stranded wire high-speed rail through ground wire

A technology of through ground wire and rapid annealing, which is applied in the direction of improving process efficiency, manufacturing tools, improving energy efficiency, etc., can solve problems affecting processing and performance, coarsening of core material grains, etc. The effect of short time and fast heating speed

Pending Publication Date: 2022-04-22
UNIV OF SCI & TECH BEIJING +1
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

[0004] The present invention intends to provide a continuous and rapid annealing process for brass-clad pure copper stranded high-speed iron through-ground wires to solve the problem of grain coarsening of the core material caused by isothermal annealing during the processing of through-ground wires in the prior art and affect processing. and performance issues
[0006] The principle and advantages of this scheme are: in actual application, in this technical scheme, aiming at the problems existing in the isothermal annealing of the existing brass-clad pure copper stranded wire, the inventor has studied the annealing method, annealing temperature, heating power and feeding speed, etc. Comprehensive consideration from multiple angles

Method used

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  • Continuous rapid annealing process for brass-coated pure copper stranded wire high-speed rail through ground wire
  • Continuous rapid annealing process for brass-coated pure copper stranded wire high-speed rail through ground wire
  • Continuous rapid annealing process for brass-coated pure copper stranded wire high-speed rail through ground wire

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Experimental program
Comparison scheme
Effect test

experiment example 1

[0033] Experiment example 1: hardness experiment

[0034] The hardness of each embodiment and the brass and pure copper before and after proportional annealing was detected, and each group was tested in three parallel tests, the results were expressed as an average, and the hardness detection method was determined by using a microhardness tester, and the results were shown in Table 2.

[0035] Table 2

[0036]

[0037] From the data of Table 2, it can be seen that before annealing, the hardness of brass and pure copper is 239HV and 134HV, respectively, the annealing temperature, heating power and feeding speed of the embodiment of the present invention are reasonable, brass and pure copper are basically completely recrystallized, the hardness is significantly reduced, the gap between brass and pure copper hardness is reduced, which is conducive to the subsequent coordinated deformation of the two materials. In the opposite proportion 1, the annealing temperature, heating power a...

experiment example 2

[0038] Experiment example 2: Microstructure

[0039] Microstructure experiments were performed on brass and pure copper after annealing in Example 1 and proportion 1, the results were as follows Figure 1 、 Figure 2 as shown. thereinto Figure 1 For the microstructure after annealing of Example 1, the left side is brass, the right side is pure copper; Figure 2 It is a microstructure after annealing in proportion 1, with brass on the left and pure copper on the right. Figure 1 In the middle, brass and pure copper are basically completely recrystallized, and the tissue is uniform, in the proportion 1, after annealing, brass and pure copper only partial recrystallization occurs, the organization is uneven, there are a large number of small angle grain boundaries, the hardness drop is not obvious, and the annealing effect is poor.

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Abstract

The invention relates to the field of metal layered composite material processing, and discloses a continuous rapid annealing process for a brass-coated pure copper stranded wire high-speed rail through ground wire, which adopts rapid induction annealing under the conditions that the annealing temperature is 500-600 DEG C, the heating power is 80-200kW, the feeding speed is 1-20m / min, and air cooling is performed after forced air cooling is performed to be below 150 DEG C after heating. The medium-frequency induction heating power supply is adopted to improve the heating rate, the brass coating layer and the pure copper stranded wire are completely recrystallized at a high temperature within a short time, on one hand, grain coarsening of pure copper caused by a low recrystallization temperature is avoided, and on the other hand, the consistency of the annealing temperature of the wire is improved.

Description

Technical field [0001] The present invention relates to the field of metal layer composite material processing, specifically to a brass-coated pure copper stranded high-speed rail through the ground continuous rapid annealing process. Background [0002] As the grounding trunk line of the railway comprehensive grounding system, the railway through the ground line uniformly grounds the equipment along the railway line, eliminates the signal interference and safety hazards caused by the potential difference between different equipment, and is the key material to ensure the safety of railway traffic and realize the high-speed, heavy-duty and intelligent communication of the train. Railway through the ground line by excellent conductivity and flexibility of pure copper strand inner conductor and soil corrosion resistant to the outer protective sleeve composition, with the continuous development of railway technology, through the ground line of the outer protective sleeve from the or...

Claims

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Application Information

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IPC IPC(8): C21D9/52C21D1/26C21D1/42
CPCC21D9/52C21D1/26C21D1/42Y02P10/25
Inventor 雷宇刘新华谢建新
Owner UNIV OF SCI & TECH BEIJING
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