Production of steel-copper resilient wire

FIELD: process engineering.

SUBSTANCE: invention relates to production of cables and can be used for production of naked conductors of higher flexibility and conductivity for application as conductors of choke, interchoke, intertrack jumpers and electric traction connectors of rail circuits and as connectors in electric power engineering. In production of steel-copper conductors with conductivity of 50-60% of copper conductors of the same cross-section are subjected before twisting to annealing in noncorrosive atmosphere at 630-700°C while twisting is executed under conditions that rule out twisting of steel-copper wired about their axes.

EFFECT: higher resilience at cyclic flexure and twisting in operation.

2 cl, 3 dwg

 

The invention relates to the field of cable production and can be used in the production of non-insulated wires with high elasticity and electrical conductivity for use as conductors throttle, microsling, megaputer jumpers and connectors electrical traction rail circuits of electrified Railways, and also for connecting elements in power systems.

A method of producing annealed stalemate wire, which comprises heating wire in coils up to temperatures of 550-580°C, holding at this temperature for 3-5 hours and subsequent cooling rate of 2-10 °C/min (see A. S. No. 2046720 SU, IPC 7 C21D 9/25, publ.15.11.1991).

The disadvantage of this invention is the proposed mode of annealing, which does not eliminate the work hardening steel base, obtained in the manufacture stalemating wires, such as drawing, due to partial recrystallization and allows to obtain a wire with sufficient elasticity.

Known technology for manufacturing bare wires stalemate that twisted of seven copper and twelve steel wires in the form of a rope, copper wire twisted with a pitch of 100-150 mm and steel wire - 150-200 mm (see us Pat. No. 2256251 EN, IPC 7 H01B 5/08, publ. 10.07.2005).

Known manufacturing technology Provo�and the electrical conductors and for Megrelishvili elements of railway tracks, containing the overlay to the Central core of the inner layer of steel wires, in versions with Nickel, zinc or chrome finish, and the outer braid of copper wires and steel with copper or Nickel-copper coating (see us Pat.№2179348 EN, IPC 7 H01B 5/08, publ. 10.02.2002 and Pat. No. 2185970 EN, IPC 7 B60M 1/30, publ. 27.07.2002, respectively).

The main disadvantage of manufacturing techniques and structures of these wires is that they are twisted of wires with very different strength and plastic properties of copper and steel. In conditions of cyclic alternating loads specific to rail connector, the braids of copper and steel wires will deform quite differently, which will considerably reduce the elasticity and reliability of the wire as a whole. Even partial destruction of the layer of copper wires will increase the electrical resistance of the wire in General and the inevitable burnout of a connector or jumper traction current.

A method for manufacturing adapted to the mounting rail journey bimetallic stalemating stranded wires, whereby the wires twisted in a stranded conductor of wire with a steel core and a copper sheath having a conductivity of not more than 50% of the copper wires of the same section, machined parts�Laut thermal annealing in a furnace or a large current at a temperature of 850-1080°C for at least 30 min (see Patent No. 2139799 EN, IPC 7 B60M 1/00, publ.20.10.1999).

The main disadvantage of this method of manufacture adapted for mounting, i.e. more flexible wires is that under this regime annealing stalemate wire completely lose their elastic properties, which reduces their flexibility and operational reliability in the composition of rail connector under cyclic alternating loads caused by the displacement of the rails during the passage of the composition.

In addition, annealing in this temperature range leads to rapid dissolution of the bimetal elements in each other, especially steel, copper, and, consequently, to a significant reduction in the conductivity of the copper layer and the wire as a whole. This fact, along with the conductivity stalemating wires wires not more than 50% of the copper significantly reduces the amount of limit the current load on the wire.

The closest to the claimed is a method of manufacturing stalemating elastic wires with high electrical conductivity, whereby the bimetallic wire with a steel core and a copper sheath conductivity 50-60% of the copper wires of the same section the amount of not less than sixty one wire recoil in multiwire conductor after stranding conductor is subjected to heat treatment and before the heat treatment megapro�dairy conductor is subjected to elastic-plastic bending in at least two mutually perpendicular planes at a value not less than its outer diameter, and heat treatment is performed by annealing at a temperature 720-820°C for 4-6 hours in non-oxidizing atmosphere, then cooling to 180-200°C in the same environment and final air cooling. In addition, stranded conductor twist of bimetallic wire, which is applied consistently no less than four layer with alternating directions of stranding (see Patent No. 2310250 EN, IPC 7 H01B 5/08, publ. 10.11.2007).

The main disadvantage of this method of manufacturing elastic, i.e., more flexible wires is that under this regime annealing twisted out of stalemating core wires is the sintering of the individual wires in the wires, which reduces their elasticity and wires in General lose their elastic properties that are important during installation and operation as part of the jumpers and connectors under cyclic alternating loads. The wires of this design are highly susceptible to mechanical damage, until the destruction, tearing wires, for example, travel machines. In addition, the twisted wires of not less than sixty-one wire has been inefficient technologically, especially in the manufacture of wires of small cross-sections, due to the reduction of the diameter of individual wires.

The basis of the invention is development of a method of manufacturing stalemating wires, possessing�x increased elasticity along with high conductivity, in the composition of the jumpers and connectors while they are working in rail and electrical circuits under alternating bending and torsion stalemate Explorer that will improve their reliability and increase service life, and their design should provide a high resistance to mechanical stress and high technological efficiency of the manufacturing process of wires.

The problem is solved in that in the manufacture stalemating elastic conductor comprising a twist stalemating wires with electrical conductivity 50-60% of the copper wires of the same section in the multi-core by successive superposition of layers with alternating directions of twist, stilemedia wire before stranding in multi-wire conductor is subjected to heat treatment in the mode of annealing in non-oxidizing atmosphere at a temperature of 630-700°C, and the twisting is carried out in a mode that excludes the twisting stalemating wires around its axis in the process of twisting. In addition, twist stranded wire made from stalemating wires with bulk copper content in the range of 40-50% of the amount of not less than thirty-seven and a ratio of the pitch of the helix in the range of 10-20.

The invention is illustrated by drawings, where Fig.1 shows the scheme of technological process of manufacturing stalemating elastic �of delivery, Fig.2 shows a photograph of the planetary stranding machine, Fig.3 shows the graphical dependence of the efforts of the curve (elasticity) wire cross-section 70 mm2with a nominal conductivity of 50% to 90 deg. pre-heat-treated wires 61 (Fig.1) pre-heat-treated wires 37 (POS.2) and heat-treated 61 residential wire after stranding (POS.3) from the current value of annealing temperature, where the ordinate axis is marked values the efforts of the curve and the abscissa axis - the values of the current annealing temperature.

Wire telemetry elastic is made as follows.

Stylemenu wire consisting of a steel core and a copper sheath, receive multiple drawing from stalemate wire rod with durable steel and copper. After drawing stalemate wire to the desired diameter, it is subjected to heat treatment in the mode of annealing in a continuous furnace, the induction heating or the charging of the furnace 1 (see Fig.1) in non-oxidizing atmosphere in a vacuum or protective gas, with a pre-wound in coils or on spools. During heating in the temperature range of 630-700°C due to recrystallization of the steel structure increases the plasticity of the steel core and stalemates wire in General, as well as relaxation occurs inside�Rennie stress accumulated stalemate wire during the drawing process. Besides the mutual diffusion of atoms of iron and copper, which increases the strength of the connection of the core with the shell stalemate wire, which increases the number of alternating bends of the wire to fracture. The temperature of 630°C is sufficient for a complete recrystallization of the steel framework. In the temperature range of 630-700°C in the steel base stalemates wire structure is formed, which ensures the good plastic properties of the base and the elasticity of stranded wire in General. When heated above 700°C, the wire becomes so malleable that it can lead to high breakage of wire during twisting.

After complete cooling of the wire in a non-oxidizing atmosphere of a wire 2 is wound on the spool 3, which is installed in the nacelle of the rotor twisting machine 4. While the rotation of the rotors and the unwinding of the wire from the spools is consistent with the lay stranded wire wire. Received lived the 6 wire after stranding transported dostepny pulling unit 5 machine 4 is wound on the drum 7 by the receiving apparatus of the machine 4.

As a twisting machine 4 can be used cigar machine or planetary type with 100% otkrytki spools (see Fig.2), which excluded Zach�weft wire around its axis when twisting wire, eliminating raskruchennosti wire after twisting and improves the uniformity of its plastic properties along the length. After stranding in this mode in the wire be only a minor strain elastoplastic bending that occurs when applying braids. Residual bending stresses distributed over the cross section, when the alternating cyclic deformation of the wire in the jumpers and connectors, superimposed on the operating voltage, can increase the life of the elements of the track circuits to failure due to the greater elasticity of the wire.

Due to the preliminary heat treatment (annealing) stalemates wire with high conductivity and bulk copper content of 40-50%, in the absence of sintering of the wires in the layer is comparable to the elasticity of the wire can be obtained when the twist stranded wire of not less than thirty-seven wires. Comparable to more stranded wires elasticity provides a high plastic content of copper. The increase in the diameter of the wires and the decrease in their number with the same wire size will improve performance when drawing and stranding, and use constructively simpler torsion machine. In General, this technology increases the efficiency of the whole manufacturing process of the wire. Provo�and, twisted out of larger diameter wires are less prone to breakages of wires under mechanical action on the wire.

The obtained elastic telemetry wire further cut into dimensional segments and is used as a conductor in the manufacture of the throttle jumpers and connectors electrical traction, for example, the type of LCA and EMS.

As a concrete example of the method of manufactured telemetry elastic wire with a diameter of 70 mm2made of 61 heat-treated stalemates wire with a diameter of 1.20 mm with a shell of copper grade M2 volumetric content of 52%, and wire with a diameter of 70 mm, made of 37 wires with a diameter of 1.55 mm with a shell of copper grade MC volumetric content of 48%. The wire had a nominal conductivity of 50% of the copper wire of the same diameter through the use of different brands of copper. Stylemenu wire in-line wire drawing mill wound steel coils with a capacity of 800-900 kg, which is loaded into a special mould of heat-resistant steel with a sand paddle, lid, and a pipe for supplying non-oxidizing gas atmosphere. As a non-oxidizing gas atmosphere used carbon dioxide, which was filed in the muffle from the cylinder at a predetermined rate for a pre-purge of the muffle and during the whole time of annealing and cooling to 80-100°C. Muffles p�was placed into a shaft furnace PSS 10.20-12 and within 5 hours was heated to temperatures of 600, 630, 650, 680 and 700°C with subsequent cooling. After cooling muffles up to 80-100°C with spools of wire were removed from the muffle for further cooling to a temperature of 20°C in air. After cooling, the copper jacket was the color from copper to dark red.

The wire from the coils were rewound on the spool planetary stranding machine KVR 18+24/500 (see Fig.2). In the first pass of lay of the wires of the 61 wire braided core construction 1+6+12 (wires) with multiplicity of steps of strand: 19 (1 Powel) and 14 (2 Powel). In the second pass on this core can put two layer - structure 18+24 (wires) with multiplicity of steps of twisting: 11 (3 Powel) and 11 (4 Powel).

In the first pass of lay of the wires of 37 wires braided core construction 1+6 (wires) with a multiplicity of pitch 20 (1 Powel). In the second pass on this core can put two layer - structure 12+18 (wires) with multiplicity of steps of twisting: 14 (2 Powel) and 11 (3 Powel).

Twist the wires on all the braids were carried out at 100% otkrytki spools.

From the wires 70 mm2of twisted wires, annealed at different temperatures, one cut dimensional samples of length 200 mm for measuring the force of bending at 90 degrees. (elasticity) and 1500 mm for the manufacture of the connector EMSEV 70-1500. The test results of the elasticity of the wires are shown in plot form in Fig.3.

When�Eden in Fig.3 shows the dependence, the effort of bending wires decreases monotonically from 0.25 to 0.20 kN 37 kN for wire and from 0.24 to 0.18 kN 61 kN for wire wire in the entire temperature range of conducting annealing incoming wires in the wire and thus improves its elasticity. The force value for bending wires should not exceed 0.25 kN, provided that a document NB zht TST 120-2003 "Jumpers throttle, which regulates the settings of the jumpers.

The sample connectors type EMSEV 70-1500 with wire 61 and wire 37 wire cross-section 70 mm2according to test results meet all the technical requirements NFTH 30.004-2010.

During annealing twisted stranded wire at higher temperatures in the range of 720-800°C force bending with increasing temperature in the beginning of the range decreases, but only slightly from 0.23 to 0.22 kN kN, and then starts to increase and goes beyond acceptable values. The study of the annealed cores shows that an increasing number of sintered wires. This leads to loss of elasticity.

In addition, for the manufacture stalemate wire of small cross-sections, for example 50 mm2for strands of wire, the wire 61 in the line drawing of mill stretch stylemenu wire to a diameter of 1.02 mm For conductors of the same cross section of 37 wires required wire diameter of 1.35 mm, th� improve the productivity of the drawing line 1.75 times and to simplify the technology of the subsequent process of twisting.

Connectors with wires from wires 37 that are installed in the track circuits, less susceptible to mechanical damage (e.g., from brushes snow machines) than with wires from wire 61, due to the larger diameter wires included in the wire construction.

1. A method of manufacturing stalemating elastic conductor comprising a twist stalemating wires with electrical conductivity 50-60% of the copper wires of the same section in the multi-core by successive superposition of layers with alternating directions of lay, characterized in that stalemate wire before stranding in multi-wire conductor is subjected to heat treatment in the mode of annealing in non-oxidizing atmosphere at a temperature of 630-700°C and their subsequent twisting is carried out in a mode that excludes the twisting stalemating wires around its axis in the process of twisting.

2. A method according to claim 1, characterized in that the twist stranded wire made from stalemating wires with bulk copper content in the range of 40-50% of the amount of not less than thirty-seven and a ratio of the pitch of the helix in the range of 10-20.



 

Same patents:

FIELD: electricity.

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EFFECT: method allows provision of high-quality composite cores; production of high-temperature aluminium wires for overhead transmission lines on the basis of such cores having improved mechanical strength, flexibility, twisting; increase of operating temperature for overhead transmission lines; 2-3 times increase of capacity for overhead transmission lines, minimum sagging of transmission lines.

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5 cl

Electric cable // 2256969

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EFFECT: enhanced capacitance of working load on cable pair.

1 cl, 4 dwg, 1 tbl

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