EA017255B1 - Bimetal electrode wire, method of producing the same and device therefor - Google Patents

Abstract

The inventive result is aimed at improving the quality of bimetal electrode wire and simplified a device design for production therefor. The result is obtained by producing a bimetal electrode wire comprising a core made from a central aluminum conductor of circular section enveloped symmetrically by nickel conductors of circular section of the same diameter wherein the nickel conductors contact therebetween forming air spaces between them and the aluminum conductor along the wire. A device is also provided for producing a bimetal electrode wire comprising a shell with a rigidly fixed mandrel holder having an extended head part, along the perimeter channels are made arranged axially and communicated with a receiving cavity of the device for loading a billet of aluminum shell and a working chamber for pressing said billet to an aluminum yield state. A method is also provided for producing a bimetal electrode wire characterized in that the wire core is transferred through the device working chamber whereto, heated aluminum billet is fed to the receiving cavity for compaction, providing plastic deformation of aluminum to its yield state for applying on the core to form an aluminum shell.

Description

These technical solutions relate to the manufacture of wire, the design feature of which is that it has a core and a sheath located around it around the perimeter, made of a material that differs in physical properties from the core material. The wire is intended for use in mechanical engineering for spraying metal on the surface of machine parts in order to strengthen them.

Technical solutions also relate to methods for manufacturing said wire, wherein the features of the methods are the deposition and fixing of a layer of aluminum sheath on a core made of one or more wires twisted along the length. Technical solutions also relate to devices for implementing these methods, the devices being a working head that allows the wire core to move through it and to apply material to the surface of the core. Technical solutions also apply to metal forming.

The method and device for its implementation are intended for use in the field of metallurgy.

Known bimetallic wire containing located in the shell round in cross section, a core made of iron-chromium, iron-chromium-aluminum or nickel-chromium alloy, while the core is located in the shell (DR 3208283, 09/11/1999).

Known wire containing a core located in a metal layer of brass (KI 2338618, 11/20/2008). This wire is intended for reinforcing elastomeric materials.

A known wire containing a ferronickel core located in a metal layer of copper (NI 2354517, 05/10/2009). This wire is intended for use in electrovacuum and semiconductor devices.

A twisted wire product is known that contains a core made of several twisted wires and is located in a sheath that is made of a material that differs in physical properties from the physical properties of the core (NI 2075362, 03.20.1997).

Known wire structure (structure) containing made from one or more twisted wires of the core, located in the shell, which is made of spiral wound wires with a gap between them (KI 98119946, 06/27/2000).

Known methods for the manufacture of wire, each of which is characterized in that a sheath material is applied to the core of the wire made of at least one central core, for which the core is moved through the working chamber of the device used to apply the sheath to the core (KI 97113197, 10.01. 1999; 8I 1824779, 09/10/1996; NI 99101725, 11/27/2000; NI 2214311, 11/27/2000; KI 2099166, 12/20/1997; 8I 1807618, 06/27/1996; KI 2240355, 11/20/2004; NI 2162900, 02/10/2001 ; KI 2274536, 06/28/2004; KI 99103207, 04/10/2001; KI 2338618, 02/10/2006; KI 2354517, 05/10/2009).

Of the known methods close to the claimed is a method of manufacturing a nickel-aluminum wire, characterized in that on the core of the wire, which is made of several cores, the wire sheath is fixed, for which one of the sheath layers is formed of aluminum and the wire sheath is fixed on the core using means heating and melting the components of the wire (KI 2274536, 06/28/2004), as well as a method of manufacturing a wire, characterized in that they form a composite wire blank, evayut it to a temperature and plastically deform the billet components to a predetermined wire size (NO 2354517, 10.05.2009).

Known technical solutions to the problems of manufacturing stranded wires, each of which contains a working chamber, means for supplying a component of a wire, for example, a core of a wire, and means for supplying a second component to the chamber for making a sheath of wire (NI 2179500, 07.17.2000; NI 2086380, 08/10/1997; KI 2274536, 06/28/2004; 8I 622390, 08/30/1978; NI 97113197, 01/10/1999; 8I 1824779, 09/10/1996; NI 2214311, 11/27/2000; 1R 8142710, 04.06.1996; 1R 7236962, 12.09 .1995; 1Р 6234059, 08/23/1994; I8 2005178000, 08/18/2005; 1Р 2000301227, 10/31/2000; I8 2001030027, 10/18/2001; EP 0794026, 09/10/1997; EP 0523022, 01/13/1993).

At the same time, in I8 2001030027 a device for manufacturing a wire is presented, containing the working head of the machine, in the case of which there is a means for applying a sheath to the core of the wire, which is formed by crimp rollers from two workpiece tapes wrapped around the core, designed to make the wire sheath.

EP 0523022 discloses a surface treatment device for a wire, which comprises a housing and a channel for passing the wire located therein, a working chamber for treating the wire with a pressure agent, an agent shaper.

EP 0794026 discloses a composite wire manufacturing apparatus comprising a housing with a working chamber for passing through it a core of a wire and applying a sheath of two crimped Cu-Ζη-полос strips to the core of the sheath.

1P 2000301227 presents a device containing a matrix with an inlet conical hole and a calibration hole, a first hollow guide for the blank to be applied to the core of the wire material, and a second hollow guide for another blank of the material.

I8 2005178000 presents a device for making wire, comprising a housing, media

- 1 017255 for supplying the core of the wire with a guide channel, means for receiving the finished wire, a chamber located between said means, communicated through the feed channel with means for moving the blanks for the wire sheath into the chamber.

In £ P 8142710 a device for applying a sheath to a wire core is provided, comprising a housing, cavities for supplying sheath material to the working chamber, a calibrating hole in the matrix, and an outlet channel.

In £ P 7236962 a device for manufacturing a wire is presented, comprising a housing with a receiving chamber for feeding and melting the workpiece, a channel in the housing for dragging a core through it, and a working chamber in communication with the receiving chamber.

£ 6,234,059 discloses a device for applying material to a core of a wire, comprising a housing with a receiving cavity for introducing into the housing a blank of material for forming a sheath, a guide channel for supplying a core, a channel cone entering a conical opening of the receiving channel to adjust the clearance between the cone and tapered hole.

Of the known technical solutions, the device (VI 2086380), which contains a line for the manufacture of wire, including a roll forming mill with stands and a batcher for feeding the wire component to the workpiece, a reduction unit to obtain the final wire, is close to the device for manufacturing wire presented in this description wire size, drawing drum, rolling stand with rolls, installed behind the feeder-dispenser, a tubular profile with a device for closing it and a double three-roll stand. This line has a relatively complex structure. These shortcomings adversely affect the quality of the wire.

The technical solution (KP 2274536) has the same drawback, which contains a working chamber in the form of a die, a shaper, a sealant and means for supplying wire components that are interconnected.

The results of the technical solutions presented in this description are to improve the quality of the bimetallic electrode wire, simplify the design of the device for its manufacture and simplify the management of the device.

The indicated result was obtained by a bimetallic electrode wire, which is characterized in that it contains a core made of a central aluminum core of circular cross section, around which nickel conductors of circular cross section of equal diameter are symmetrically located in contact with it, while the nickel conductors contact with each other to form air cavities £ 1 between them and an aluminum core along the wire, the diameter of each core is from 0.8 to 0.85 mm, nickel wires are twisted in a spiral with a pitch of 1 twist along the length 30-50 mm of wire, and the core of the wire is located in a continuous sheath made of aluminum and having a circular cross section in cross-section, the aluminum content in the wire being 27.16-28.0%, and nickel within 72.8 -72.0%.

In a bimetallic electrode wire, the sheath covers the core with the formation of air cavities between it and nickel conductors with an area of £, and the outer diameter of the sheath of the wire with the indicated core diameter is 3.07-3.18 mm.

The area £ 1 of each air cavity of the wire in its cross section is selected depending on the diameter of the core and on step 1 of the strand twisting, with £ 1 = (0.1-0.2) P, where P is the area of each core in its cross section .

A device for manufacturing a bimetallic electrode wire is provided, which comprises a housing with a rigid holder fixed therein, having a widened head, at the periphery of which there are channels arranged in the axial direction of the holder and communicated with the receiving cavity of the device for loading the aluminum blank and the working chamber designed for pressing said preform to a state of fluidity of aluminum, a mandrel for supplying a core is fixed in the holder a wire having a stepped hole coaxial with the holder hole and communicated with it, while the matrix is fixed in the housing with the possibility of its axial movement by means of a stop bolt, having a conical hole coaxial with the mandrel hole, which is in communication with the central hole of the stop bolt movably mounted in a small cartridge, which is movably mounted in the central hole of a large cartridge.

In the device, the central hole of the large chuck is coaxial with the hole of the holder, while it has a threaded connection to the body, the small chuck is connected by a threaded hole to the large chuck, the stop bolt is threaded to the small chuck, and the flat matrix is connected to the small chuck by screws through the pressure ring installed in annular protrusion of the matrix, and has a cylindrical hole coaxial with the conical hole of the matrix, and the ends of the large cartridge, small cartridge and thrust bolt have faceted heads, the dimensions of which Hang away from the body.

The working chamber is formed by the gap between the conical recess made in the matrix holder and the cone made on the end of the mandrel, the matrix is flat and located in the central hole of the matrix holder with the possibility of its longitudinal movement due to rotation

- 2 017255 of a faceted head of a persistent bolt and exceptions of its rotation around its own axis.

A method for manufacturing a bimetallic electrode wire is provided, characterized in that the core of the wire, made of a central aluminum core, around which a plurality of nickel conductors are twisted together in a spiral, are moved through the working chamber of the device according to claims 4-6, and fed into the receiving cavity of the aforementioned device, the aluminum blank heated to a temperature of from 400 to 600 ° C, and pressed in the working chamber by pressure, which provides plastic deformation of aluminum to its fluid state and for application to the core to form an aluminum sheath.

In the method, during the movement of the core of the wire through the working chamber, the aluminum pressing force is reduced or increased to control the density of the aluminum sheath of the wire, the speed of movement of the core of the wire in the device and the speed of exit of the wire from it, and when applying an aluminum sheath covering the core with the formation of air cavities located between the sheath and the veins of the core, additionally regulate the cross-sectional area of each air cavity.

In FIG. 1 shows a bimetallic electrode wire in its cross section;

in FIG. 2 is a diagram of a strand of wire strands;

in FIG. 3 - embodiment of the wire;

in FIG. 4 - a device for the manufacture of bimetallic electrode wire in longitudinal section;

in FIG. 5 is a section AA in FIG. 4;

in FIG. 6 is a view B in FIG. 4;

in FIG. 7 - the relative position of the mandrel and the flat matrix in the working position of the device;

in FIG. 8 - the location of the core of the wire in the device before starting to work before pressing the aluminum billet;

in FIG. 9 - the location of the wire and its core in the device during its operation in the process of pressing an aluminum billet;

in FIG. 10 - the location of the finished wire and its core in the device after pressing an aluminum billet;

in FIG. 11 is a diagram of a production line for manufacturing wire as part of a device for twisting a core, a device for making wire, a press, and scissors.

The bimetallic electrode wire (Fig. 1) contains a core made of a central aluminum core 1 of predominantly circular cross section, around which a plurality of nickel cores 2 are arranged symmetrically, which also have a predominantly circular cross section. Cores 2 are included in the design of the core of the wire.

The aluminum core 1 is in contact with all the nickel cores 2, and the latter are in contact in such a way that air cavities 3 are formed between the cores 1 and 2, extending along the wire. The diameter b of each core 1 or 2 in this example wire is in the range from 0.8 to 0.85 mm, while the diameter of core 1 is equal to the diameter of each core 2.

Cores 1 and 2 (FIG. 2) in the operating position shown in FIG. 1, twisted together in a spiral and represent a cord with a pitch of 1 twist along the length of the wire in the range from 30 to 50 mm with the specified diameter of cores 1 and 2. The optimal value of the pitch ΐ of twist is 1 = 44.4 mm for cores of the core of the wire with each diameter veins equal to 6 = 0.82-0.83 mm. In this case, the diameter of the finished wire is obtained in the range of 3.10-3.18 mm with an aluminum content in the range of 27.16 to 28.0% and a nickel content in the range of 72.84 to 72.0%.

The core of the wire is located in a continuous sheath 4, which is made of aluminum and in cross section has a predominantly circular outer surface. The shell covers the core in such a way that air cavities 5 are formed between it and the cores 2. The area ί of each air cavity 5 in its cross section is selected in the range ί = (0,0-0,4) Ρ, where P is the area of the core 1 or 2 in its cross section. In this example, the wire with the specified core diameter 1 and 2, the outer diameter of the sheath 4 of the wire corresponding to the diameter of the wire is in the range from 3.07 to 3.18 mm In FIG. 3 shows a variant of the wire at ί = 0 for the case when the air cavities 5 (Fig. 1) are completely filled with aluminum and the wire does not have these cavities.

Another area ί1 of the air cavity 3 in the cross section of the wire depends on the diameter of the cores 1 or 2 of the wire and on the pitch ΐ of the twisting of the cores (Fig. 2). The smaller the diameter of the core 1 or 2 and the smaller the pitch ΐ of the strand twisting, the smaller the area ί1 of the air cavity 3. This area is within пределах1 = (0.10,2) P, where P is the area of the core 1 or 2 in its transverse cross section, variable depending on the diameter of the 6 wires. This diameter is within the above ranges.

It should be noted that the area ί1 of the air cavity 3 is of great importance when melting the wire and spraying its particles during metallization of the surfaces of machine parts and for this embodiment, the optimal value of the cross-sectional area ί1 of the air cavity is 1/12 of the cross-sectional area P of the core 1 or 2.

A device for manufacturing a bimetallic electrode wire is provided, implements

- 3 017255 the above described method of manufacturing wire.

A device for manufacturing a bimetallic electrode wire (Fig. 4) comprises a housing 6 with a holder 7 fixed therein, having an expanded head portion 8, on the periphery of which channels 9 are arranged along the perimeter, located in the axial direction of the holder. In the holder 7, a mandrel 10 is fixed, having an axial hole 11 located on the axis 12 of the hole 13 of the holder 7. The holes 11 and 13 are interconnected. The axial hole 11 is made stepped and the first stage 14 of the hole 11 has a smaller diameter in comparison with the diameter of the second stage 15 of this hole.

A flat matrix 16 is fixed in the housing with a conical hole 17 made therein, which is in communication with the central hole 18 of the stop bolt 19, movably mounted in the small cartridge 20, which, in turn, is movably mounted in the central hole 21 of the large cartridge 22. The large cartridge represents a large-sized bolt having a faceted head at the end 23. The hole 21 of the large cartridge is located on the axis 12 of the body holder. The holes of the stop bolt 19, small cartridge 20 and large cartridge 22 are made through, located on the axis 12 of the device. On the outer surfaces of the thrust bolt 19, small and large cartridges 20 and 22, on the inner surface of the small and large cartridges and in the housing 1, a thread is made.

The end of the small cartridge 20 has a faceted head 24. The end of the thrust bolt 19 has a faceted head 25. The dimensions of the faceted heads 23, 24 and 25 are reduced to the side of the housing 6. The large cartridge 22 is screwed into the thread of the housing. Small cartridge 20 is screwed into the internal thread of the large cartridge. The stop bolt 19 is screwed into the internal thread of the small cartridge 20.

The flat matrix 16 is made flat in order to prevent its rotation in the device around its own axis. The matrix is connected to the small cartridge 20 by a clamping ring 26, which is connected to the small cartridge by screws 27. For this, the flat matrix 16 has protrusions 28, in which the compression ring 26 abuts in the pressed position of the ring against the protrusions 28. The flat matrix 16, in addition to the conical hole 17 has a cylindrical hole 29 located in a small segment (FIG. 7), in communication with holes 17, 11 and 13.

The device comprises a working chamber 30, which in the longitudinal section of the device has a V-shaped contour and is a conical recess, round in shape. The chamber 30 is located between the surface 31 of the conical recess, which is made in the matrix holder 32, and the surface of the cone 33, which is made on the end of the mandrel 10. The matrix 16 is located in the Central hole of the matrix holder 32 with the possibility of movement in this hole of the matrix 16. The matrix is called flat because which has narrow and wide sides, while the latter are located horizontally. The clamping ring 26 is located between the matrix holder 32 and the end face of the large cartridge 22.

The aluminum blank 34 in the form of a separate checker has a circular cross-sectional shape (Fig. 6) and is located in the receiving cavity 35 of the device, which is made in the housing 1, and also has a circular shape corresponding to the shape of the blank 34. The receiving cavity 35 of the device has a rounded portion 36 at the bottom, in the form such as that shown in FIG. 4. The receiving cavity 35 is in communication with the cavity of the working chamber 30 through the channels 9 of the holder 7.

The wire in the described device is made in two ways, one of which is the way to use the finished core 37 (Fig. 11) of a wire made of cores 1 and 2, which is made on another device, in particular on a twisting machine 38. This path provides that the twisting the machine is not connected to device 39.

The second way (Fig. 11) of the manufacture of wire is the way of its production on the line, which is made as part of the device 39 for making wire, twisting machine 38, press 40, scissors 41 and receiving device 42. All these parts of the line are interconnected mechanically and electrically and interact with each other by means of the automatic control unit 43, which is connected electrically with the drives of these parts of the line. As a receiving device 42, a bobbin for winding wire into a coil (upper position in FIG. 11) or a tray (lower position in FIG. 11) can be used. The finished wire coated with an aluminum sheath 4 on core 37 is shown at 44 (FIGS. 9, 10).

In the presented line, it is significant that the drive of the device for manufacturing wire is absent, since the movement of the core 37 of the wire and the wire itself during its manufacture is carried out by the pressure of the press 40 on the aluminum blank 34 (Fig. 4). The movement of all working bodies of the production line, twisting machine drives and scissors is coordinated with the operation of the press drive through the specified control unit.

A method of manufacturing a wire and the operation of the device for making wire are as follows. If the device for manufacturing the core of the wire and the scissors are installed separately from the device for manufacturing the wire, then first they perform the operation of twisting the nickel cores 2 of the wire around the longitudinal axis of the core 37 of the wire or around the core 1 as conventionally shown in FIG. 2. By twisting, the core 37 of the wire is made of cores 1 and 2.

Set the gap 8 between the end face of the cone 33 (Fig. 7) and the end face of the flat matrix 16, respectively

- 4 017255 vii with the required thickness of the sheath 4 of the wire, while the specified gap is carried out by moving the matrix in the axial direction of the device. To do this, the faceted head 24 of the stop bolt 19 is rotated to the corresponding side and the matrix 16 is moved in a predetermined direction in the hole of the matrix holder 32. After this, the end part of the core 37 of the wire is placed in the working chamber 30 of the device as shown in FIG. 8, and the end of the core is located in the conical hole 17 of the flat matrix 16.

An aluminum billet 34 (FIG. 4), heated to a temperature of 400-600 ° C., is fed into the cavity 35 of the device and a billet is pressed in this cavity by pressure P (FIG. 5) to a state of fluidity of the aluminum billet. The pressure is carried out by the press 40. In this case, aluminum in a plastic state is pressed out of the cavity 35 when pressed and under pressure passes through the channels 9 into the working chamber 30 of the device. Further, from the working chamber through the gap between the end of the cone 33 and the end of the flat matrix 16, aluminum in its fluid state falls on the surface of the core 37 of the wire, envelops the core and twisted in a spiral core 2 core. From the specified pressure P, ductile aluminum is extruded together with the finished wire through the gap to the cavity of the conical hole 17, since the pressure acts on the wire in its axial direction. The wire moves through the working chamber 30, the flat matrix 16 and through the hole 18 of the stop bolt 19 towards the faceted head 25 of the bolt. Then the wire comes out through the hole 18 of the thrust bolt 19 (Fig. 10).

The process of applying aluminum to the core 37 of the wire and the process of forming aluminum shell 4 on the core 37 of the wire is carried out until the termination of the pressing of aluminum in the cavity 35 of the device. In this case, the finished wire at the entrance to the conical hole 17 is calibrated by this hole and leaves the device through the central hole of the stop bolt 19 to the outside, where it is wound onto a drum in a bay or cut into segments of a given length (Fig. 11).

During operation of the device control the operation of the device. This control is represented by a control method that comprises the steps of feeding the core of the wire 37 into the working chamber 30 of the device (Fig. 8), supplying softened aluminum to the chamber 30 by pressing the workpiece 34 (Fig. 4) through the receiving cavity 35 of the device, and the workpiece is pressed to a state of fluidity of aluminum. A feature of the control method is that in the process of extruding aluminum and the core 37 of the wire from the working chamber 30 (Fig. 8) to the side of the hole 18, while moving the core of the wire through the working chamber, the pressing force P of aluminum in the receiving cavity 35 and the working cavity is reduced or increased. chamber 30, reduce or increase the density of the aluminum sheath 4 of the wire, the speed of movement of the core 37 of the wire through the working chamber 30 of the device and the speed of exit from it of the finished wire. Simultaneously with this decrease or increase in pressure P on the workpiece 34 (Fig. 4) in the receiving cavity 35, the cross-sectional area ί (Fig. 1) of each air cavity 5 of the wire located between its sheath 4 and the cores 2 of the core is regulated.

After pressing the first preform 34, a second preform is fed into the receiving cavity, and upon completion of the manufacture of wire 44 (FIG. 10), its end, including core 37, and the finished wire section shown in FIG. 10 to the left of the core 37 is left in the device. In this case, the aluminum that is present in the working chamber 9 hardens.

To restart the device in operation, it is first preheated to soften the aluminum in the working chamber and, further, the described operation cycle of the device is repeated.

It should be noted that essentially in this description in accordance with FIG. 1 and 3, two wire options are shown. The device and methods allow adjusting the pressing force P of the workpiece 34, as well as adjusting the gap to (Fig. 7) to obtain a different wire shape, including at least two of these options, the first of which is a wire with a smooth round surface and air cavities 5 between the cores wire (Fig. 1), the second option is with a smooth round surface without air cavities 5 between the veins of the wire (Fig. 3). A third version of the wire is also possible - with a corrugated outer surface, when the sheath 4 repeats the outer shape of a core 37 made of several cores (not shown), while there are no air cavities in this third version of the wire and from the inside the sheath 4 of the wire is obtained in a form identical to the shape shown in FIG. 3.

Claims (8)

CLAIM 1. Bimetallic electrode wire, characterized in that it contains a core made of a central aluminum core of circular cross section, around which nickel cores of circular cross section of diameter equal to the core are in contact with it with the formation of air cavities ί1 between them and the aluminum core along the wire, the diameter of each core is from 0.8 to 0.85 mm, the nickel cores are twisted in a spiral with a pitch ΐ of twist along the length of the wire, equal to 30-50 mm, and the heart a continuous wire located in the shell, made of aluminum and having a circular shape in cross-section, wherein the aluminum content in the wire is 27,16-28,0%, and nickel - 72,84- within 5 017 255 72.0%. 2. Bimetallic electrode wire according to claim 1, in which the shell covers the core with the formation between it and the nickel cores air cavities of area G, while the outer diameter of the wire sheath at the specified diameter of the core is 3.07-3.18 mm. 3. Bimetallic electrode wire according to claim 1, in which the area 1'1 of each air cavity of the wire in its cross section is selected depending on the diameter of the core and on step 1 of stranding the cores, while P = (0.1-0.2) B, where B is the area of each core in its cross section. 4. Device for the manufacture of bimetallic electrode wire according to claims 1-3, characterized in that it includes a housing with a rigid holder fixed in it, having a head extended part, on the periphery of which along the perimeter there are channels arranged in the axial direction of the dual holder and communicated with the receiving cavity of the device for loading the billet of the aluminum casing and the working chamber intended for pressing the said billet to the aluminum fluidity state, in the holder there is a mandrel for supplying the wire core with a stepped hole coaxial to the hole of the holder and communicating with it; in this case, the matrix is fixed in the housing with the possibility of its axial movement through a stop bolt having a tapered hole coaxial with the hole of the mandrel, which is connected with the central hole of the stop bolt movably mounted in cartridge, which is movably mounted in the center hole of the large cartridge. 5. The device according to claim 4, in which the central hole of the large cartridge is coaxial with the hole of the holder, while it has a threaded connection with the housing, a small cartridge is connected by a threaded hole with a large cartridge, a stop bolt is threaded with a small cartridge, and a flat matrix is connected to a small chuck screws through a clamping ring installed in the annular protrusion of the matrix, and has a cylindrical hole coaxially with the conical hole of the matrix, and the ends of the large cartridge, small cartridge and stop bolt have faceted heads measures that reduce in the direction of the housing. 6. The device according to claim 4, in which the working chamber is formed by a gap between a conical recess made in the die holder and a cone formed at the end of the mandrel, the matrix is flat and located in the central hole of the die holder with the possibility of its longitudinal movement due to the rotation of a faceted thrust head bolt and exclude its rotation around its own axis. 7. A method of manufacturing a bimetallic electrode wire according to any one of claims 1 to 3, characterized in that the core of the wire, made of a central aluminum core, around which a plurality of nickel cores twisted together in a spiral, is moved through the working chamber of the device according to claim 4 -6, is fed into the receiving cavity of the above-mentioned device, the aluminum billet, heated to a temperature of from 400 to 600 ° C, and pressed it in the working chamber with pressure, providing plastic deformation of aluminum to its fluid state It can be applied to the core to form an aluminum shell. 8. The method according to claim 7, wherein during the movement of the wire core through the working chamber, the pressing force of aluminum is reduced or increased to control the density of the aluminum sheath of the wire, the speed of movement of the core of the wire in the device and the speed at which the wire leaves it, covering the core with the formation of air cavities located between the shell and the core cores, additionally regulate the cross-sectional area of each air cavity.