JP2984274B2 - Method and apparatus for manufacturing composite wire - Google Patents

Description

DETAILED DESCRIPTION OF THE INVENTION [Industrial Application Field] The present invention effectively oxidizes a high-temperature metal wire when manufacturing a composite wire by processing a running metal wire while continuously heating the metal wire. The present invention relates to a method and an apparatus for producing a composite wire having a coating layer having a high bonding strength by preventing the composite wire.

[Background Art] When a composite wire is manufactured by covering a metal core wire with a different type of jacket metal, it is required that the bonding strength between the different types of metal is sufficiently high. Then, in order to manufacture a composite wire in which such dissimilar metals are firmly joined together, foreign substances on the surface of the metal core wire are removed, the surface is maintained in a clean state, and then the jacket metal is coated in a heated state. It is effective to do.
Therefore, as an example of an apparatus for performing such a manufacturing method, an apparatus having a configuration shown in FIG. 5 is known.

The apparatus shown in FIG. 5 includes a polishing device 2, a heating device 3, and a metal coating device 4. The outer peripheral surface of the metal core wire 1 is polished by the polishing device 2, then heated by the heating device 3, and heated. This is a device for producing a composite wire 5 by applying a metal coating to the metal core wire 1 by a metal coating device 4.

"Problems to be Solved by the Invention" However, in the conventional device shown in FIG. 5, the surface of the metal core wire 1 heated by the heating device 3 is oxidized before reaching the metal coating device 4. As a result, there is a problem that the bonding strength between the metal core wire 1 and the metal coating layer becomes insufficient because the metal coating layer is applied via the oxide film.

The present invention has been made in view of the above problems, and when forming a coating layer of a jacket metal on a metal wire to produce a composite wire, from heating the metal wire to coating the jacket metal. It is an object of the present invention to provide a method and an apparatus capable of effectively preventing oxidation of the surface of a metal wire between the wires and coating the coating layer with a high bonding strength to the metal wire to manufacture a composite wire. I do.

"Means for Solving the Problems" In order to solve the above problems, the method of the present invention comprises a block having an extrusion chamber into which a metal wire is fed, and a block attached to the extrusion chamber and fed to the extrusion chamber. A metal die that can pass through the inserted metal wire, and a jacket metal separately press-fitted into the extrusion chamber of the block and the metal wire, and coats the metal jacket around the metal wire passing through the die. An extruder having a press-fitting means, a protective pipe communicating with the extruder of the extruder and surrounding the metal wire before being fed into the extruder, and a heating device attached to the protective pipe And supplying an inert gas or a reducing gas to the inside of the protection pipe and the extrusion chamber by communicating with a position of the protection pipe in the vicinity of the extrusion chamber separated from the heating device, and toward the extrusion chamber side of the metal wire. Protection pipe in the direction opposite to the running direction And a gas supply device for flowing an inert gas or a reducing gas through the opening of the protection pipe to discharge the gas from the opening of the protection pipe, and heating the inside of the protection pipe to a desired temperature with a heating device to form a heating zone, The inert gas or reducing gas is supplied from the gas supply device to the inside of the protection pipe and the extrusion chamber, and the inert gas or reducing gas is discharged from the outside opening of the protection pipe. A gas flow is created toward the outer opening side, and from this state a metal wire is fed from the outer opening of the protective pipe and passed through the die of the extrusion chamber, and a jacket metal is pressed into the extrusion chamber to surround the metal wire. In which a coating layer made of a jacket metal is formed.

The apparatus of the present invention includes a block having an extrusion chamber into which a metal wire is fed, a die attached to the extrusion chamber and capable of passing through the metal wire fed into the extrusion chamber, and a jacket provided in the extrusion chamber of the block. A press-fitting means for press-fitting a metal and covering the metal wire around the metal wire passing through the die with a press-fitting means for forming a coating layer, and communicating with the extrusion chamber of the extrusion apparatus, A protective pipe surrounding the metal wire before being sent in,
A heating device attached to the protection pipe, and an inert gas or a reducing gas is supplied to the inside of the protection pipe and the extrusion chamber by being connected to a position near the extrusion chamber separated from the heating device of the protection pipe, A gas supply device for flowing an inert gas or a reducing gas into the protective pipe in a direction opposite to a traveling direction of the metal wire toward the extrusion chamber side to discharge these gases from an opening of the protective pipe. It is.

[Operation] Due to the configuration in which the metal wire passing through the inside of the protective pipe is covered with the inert gas or the reducing gas in the heating zone, the heated metal core wire moves to the subsequent process without being oxidized. For this reason, a favorable bonding state with the jacket metal can be obtained in a subsequent process of manufacturing the composite wire by coating the metal wire with the jacket metal in the extruder. Here, the flow of the gas so as to oppose the running direction of the metal wire prevents the inflow of air at the entrance of the protection pipe and efficiently removes the oxidizing gas adsorbed on the metal surface and brought into the protection pipe. This is for better removal. Furthermore, since the inside of the protection pipe is completely replaced with the inert gas by reversing the running direction of the metal wire and the flowing direction of the gas, the oxidation of the metal wire is prevented.

FIG. 1 shows an embodiment of the apparatus of the present invention.
In the figure, reference numeral 10 denotes a heating device, and 11 denotes a friction drive type extrusion device (processing device).

The heating device 10 is a device for forming a heating zone 12 therein, and is a device for heating a metal wire 13 passing through the heating zone 12.

The friction drive type extrusion device 11 is an extrusion device called a conforming device, and is engaged with a drive wheel 16 having a groove 15 on the outer periphery and a part of the outer periphery of the drive wheel (press-fitting means) 16. And a fixed shoe block 17.

And the groove 15 of the drive wheel 16 and the fixed shoe block
A pipe 18 is formed by the inner wall surface of the pipe 17, and an extrusion chamber 19 communicating with the pipe 18 is formed inside the fixed shoe block 17. Further, a draw-in hole 20 is formed in the fixed shoe block 17 to communicate with the extrusion chamber 19, and a mandrel 21 and a die 22 are installed in the extrusion chamber 19 at a position coaxial with the draw-in hole 20.

On the other hand, beside the friction drive type extrusion device 11, a heating device 10
Is provided with a protection pipe 23 that passes through the heating zone 12 and communicates with the drawing hole 20 of the fixed shoe block 17. Also,
The fixed shoe block 17 has an air supply passage 24 leading to the inlet hole 20.
A supply device 25 for supplying an inert gas such as nitrogen gas or argon gas or a reducing gas such as hydrogen gas or carbon monoxide is connected to the air supply passage 24.
These gases can be blown from 25 into the protective pipe 23 through the air supply passage 24 and the inlet hole 20.

Next, a case where a composite wire (Al-coated steel wire) is manufactured by implementing the method of the present invention using the apparatus shown in FIG. 1 will be described.

In order to manufacture a composite wire such as an Al-coated steel wire, first, the heating device 10 is operated to heat the heating zone 12 to a predetermined temperature, and an inert gas or an inert gas and A mixed gas of gas is blown, and a jacket metal (Al) 26 is supplied to the pipeline 18 of the fixed shoe block 11.

Subsequently, a metal wire 13 such as a steel wire is prepared. The metal wire 13 is processed by a surface cleaning device such as a polishing device, and then sent to the protection pipe 23.

While the metal wire 13 moves through the protective pipe 23 in the heating zone 12, the metal wire 13 is heated to a predetermined temperature. The heated metal wire 13 passes through the protection pipe 23 and the lead-in hole 20, passes through the mandrel 21, and passes through the die 22. Further, the jacket metal 26 supplied to the pipe 18 is moved by the drive wheel 16 to the extrusion chamber 19.
When the metal wire 13 passes through the die 22, the outer circumference of the metal wire 13 is covered with a jacket metal 26,
A composite wire (Al-coated steel wire) 30 composed of 13 and the coating layer 27 is obtained.

Meanwhile, while the metal wire 13 is inserted into the protection pipe 23 and travels inside the protection pipe 23 and the inside of the drop-in hole 20, the protection pipe 23
A gas such as an inert gas is a metal wire inside the inlet hole 20.
It is flowing in the opposite direction to the running method of 13. Therefore metal wire 13
Even if is heated in the heating zone 12, the surface of the metal wire 13 does not oxidize. Therefore, the metal wire 13 having a clean surface can be sent to the extrusion chamber 19 without being oxidized. Furthermore, the gas introduced into the protection pipe 23 naturally enters the extrusion chamber 19 together with the metal wire 13, so that the oxidation of the metal wire 13 can be prevented until immediately before the coating of the jacket metal 26. Therefore, since the jacket metal 26 is applied to the metal wire 13 having a clean surface,
The composite wire 30 having the coating layer 27 having a high bonding strength with respect to 13 can be manufactured.

By the way, when the metal wire 13 enters the protection pipe 23, the metal wire 13 tries to draw the surrounding air into the inside of the protection pipe 23, but flows inside the protection pipe 23 in the direction opposite to the running direction of the metal wire 13. The blowing gas blows off the air and prevents the air from flowing into the protection pipe 23. Furthermore, since the relative speed between the metal wire 13 and the gas is improved by reversing the traveling direction of the metal wire 13 and the gas flow direction, it is possible to reliably cover the periphery of the metal wire 13 with an inert gas or a reducing gas. Yes, metal wire 13
Can reliably be prevented from being oxidized.

In addition, the gas used to prevent the oxidation of the metal wire 13 is preferably a reducing gas such as nitrogen gas, an inert gas such as an argon gas, or a hydrogen gas or carbon monoxide.
When hydrogen gas is used as the reducing gas, there is a risk of explosion. Therefore, it is preferable to use a mixed gas obtained by adding a small amount of hydrogen gas to an inert gas.

Further, in the configuration shown in FIG.
Although the gas supply passage 24 is formed in this embodiment, the gas supply device 25 and the end of the protection pipe 23 may be connected by a gas supply pipe P shown by a two-dot chain line in FIG. 1 to supply gas.

FIG. 2 shows another example of the structure of the protection pipe, in which a throttle section is provided at the opening on the entrance side of the protection pipe 33 into which the metal wire 13 is inserted.
34 is formed.

When the throttle portion 34 is formed at the end of the protection pipe 23 in this manner, the gas flow velocity inside the protection pipe 33 increases inside the throttle portion 34 as shown in FIG. As described above, when the gas flow velocity increases inside the constricted portion 34, the metal wire 13
At the same time, the air that is going to flow into the inside of the protection pipe 33 can be blown out more completely, and the oxidation prevention effect is more excellent.

FIG. 3 shows still another example of the structure of the protection pipe 23. In this example, a tapered cap member 35 is attached to an end of the protection pipe 23 on the inlet side. Even in such a configuration, the same effect as the configuration shown in FIG. 2 can be obtained.

FIG. 4 shows a ram extrusion type coating apparatus (extrusion apparatus) 39 according to the present invention.
This is an example in which the present invention is applied to the following.

In this example, an extrusion chamber 40 is formed inside a cylinder block 41, a mandrel 43 and a die 44 are installed on the side wall of the cylinder block 41 so as to sandwich the extrusion chamber, and a protection pipe 45 is connected to the side wall of the cylinder block 41. It is configured. In this example, the protection pipe 45
An air supply passage 46 that communicates with the gas supply device 25 is connected to a part of the peripheral wall. Although omitted in the drawings, the extrusion chamber
A ram (press-fitting means) is provided above 40 so that the jacket metal 26 can be pressed toward the extrusion chamber 40 by the pushing force of the ram.

The other structure is the same as the structure shown in FIG. 1, and the composite wire 50 can be manufactured by forming the covering layer 49 while preventing oxidation by the apparatus having the structure shown in FIG.

The air supply passage 46 for sending gas around the metal wire 13 may be connected to the protective pipe 45 as in this example,
It is desirable to connect as close to the extrusion chamber 40 as possible.

"Effect of the Invention" As described above, the method of the present invention is to form a coating layer by coating the jacket metal after heating the metal wire, when manufacturing a composite wire, cover the metal wire with a protective pipe, In order to send the inert gas or reducing gas in the protective pipe in the direction opposite to the running direction of the metal wire, send it to the subsequent process without oxidizing the metal wire even if the metal wire is heated in the heating zone Can be. Therefore, when the metal wire is coated with another jacket metal in a later step, coating with high bonding strength can be performed. Further, since the gas is sent in the direction opposite to the running direction of the metal wire, the relative speed between the metal wire and the gas is improved, and there is an effect that air near the metal wire can be reliably removed. Further, since the gas introduced into the protection pipe is blown out from the opening on the inlet side of the protection pipe into which the metal wire is inserted, the inflow of air from the inlet side of the protection pipe can be prevented, thereby effectively preventing oxidation. Furthermore, since the gas introduced into the protective pipe naturally enters the extrusion chamber together with the metal wire, the oxidation of the metal wire can be prevented until immediately before the coating of the jacket metal.

On the other hand, the apparatus of the present invention covers the metal wire after heating the metal wire to form a coating layer by forming a coating layer.When manufacturing a composite wire, the metal wire is covered with a protective additional pipe, and the metal wire is placed in the protective pipe. Since the inert gas or the reducing gas can be sent in the direction opposite to the traveling direction of the metal wire, the metal wire heated in the heating zone can be sent to the subsequent process without being oxidized. For this reason, when manufacturing a joining line by coating a metal wire with another jacket metal in a later process, a composite wire having a high joining strength between the metal wire and the jacket metal can be manufactured. In addition, since gas is sent in the direction opposite to the running direction of the metal wire and the relative velocity between the metal wire and the gas is improved, there is an effect that air near the metal wire can be reliably removed to prevent oxidation. Furthermore, since the gas introduced into the protection passage can be blown out from the opening on the inlet side of the protection pipe into which the metal wire is inserted, it is possible to prevent the inflow of air from the inlet side of the protection pipe, thereby further improving the oxidation prevention effect. Can be assured. Furthermore, since the gas introduced into the protective pipe naturally enters the extrusion chamber together with the metal wire, the oxidation of the metal wire can be prevented until immediately before the coating of the jacket metal. In addition, a gas supply device is connected to a position near the extrusion chamber that is separated from the heating device of the protection pipe, and an inert gas or a reducing gas is supplied from the extrusion chamber side to the heating device into the protection pipe and the extrusion chamber toward the heating device. This prevents a problem that the heated gas comes into contact with the extrusion chamber and unnecessarily heats the extrusion chamber, and the temperature of the extrusion chamber can be easily and precisely controlled.

[Brief description of the drawings]

FIG. 1 is a cross-sectional view showing one embodiment in which the apparatus of the present invention is applied to a friction drive type extruder, FIG. 2 is a cross-sectional view showing another example of the inlet end of a protective pipe, and FIG. FIG. 4 is a cross-sectional view showing another example of the structure of the inlet side end of the protective pipe, FIG. 4 is a cross-sectional view showing an embodiment in which the apparatus of the present invention is applied to a ram extrusion coating apparatus, and FIG. FIG. 10 ... heating device, 11 ... friction drive extrusion device, 12 ... heating zone, 13 ... metal wire, 23, 33, 45 ... protection pipe, 24 ... air supply hole, 25 ... gas supply device, 26 ... jacket metal, 27, 49 ... coating layer, 30, 50 ... composite wire, 39 ... ram extrusion type coating equipment.

Continued on the front page (72) Inventor Hiroaki Iwayama 9-1, Futaba-cho, Numazu-shi, Shizuoka Fujikura Electric Wire Inside Numazu Plant Co., Ltd. (72) Inventor Makoto Nagashima 9-1, Futaba-cho, Numazu-shi, Shizuoka Fuji Electric Wire Numazu, Ltd. Inside the factory (56) References JP-A-49-126508 (JP, A) JP-B-60-18571 (JP, B2)

Claims (2)

(57) [Claims] 1. A block having an extrusion chamber into which a metal wire is fed, a die attached to the extrusion chamber and capable of passing through the metal wire fed into the extrusion chamber, and a metal die provided in the extrusion chamber of the block. An extruder including press-fitting means for press-fitting the jacket metal separately from the wire and coating the jacket metal around the metal wire passing through the die to form a coating layer; and an extrusion chamber of the extrusion apparatus. A protective pipe surrounding the metal wire before being sent to the extrusion chamber in communication with the heating pipe, a heating device attached to the protection pipe, and a position of the protection pipe near the extrusion chamber separated from the heating apparatus. While supplying an inert gas or a reducing gas into the protection pipe and the extrusion chamber, and flowing an inert gas or a reducing gas into the protection pipe in a direction opposite to a traveling direction of the metal wire toward the extrusion chamber. These from the opening of the protective pipe Using a gas supply device for discharging the gas, the inside of the protection pipe is heated to a desired temperature by a heating device to form a heating zone, and an inert gas or an inert gas is supplied from the gas supply device to the inside of the protection pipe and the extrusion chamber. A reducing gas is supplied, these gases are discharged from the outer opening of the protective pipe, and a gas flow is formed in the protective pipe from the extrusion chamber side of the protective pipe to the outer opening side of the protective pipe. Is fed from the outside opening of the protective pipe and passed through the die of the extrusion chamber, and a jacket metal is pressed into the extrusion chamber to form a coating layer made of the jacket metal around the metal wire. Manufacturing method of composite wire. 2. A block having an extrusion chamber into which a metal wire is fed, a die attached to the extrusion chamber and capable of passing through the metal wire fed into the extrusion chamber, and a jacket provided in the extrusion chamber of the block. A press-fitting device for press-fitting a metal, and press-fitting means for coating a jacket metal around a metal wire passing through a die to form a coating layer; and A protection pipe surrounding the metal wire before being fed, a heating device attached to the protection pipe, and a protection pipe connected to a position in the vicinity of the extrusion chamber separated from the heating device and extruded into the protection pipe. An inert gas or a reducing gas is supplied into the chamber, and an inert gas or a reducing gas flows into the protection pipe in a direction opposite to a running direction of the metal wire toward the extrusion chamber, and the gas flows through the opening of the protection pipe. Gas to discharge gas Composite wire manufacturing apparatus characterized by comprising; and a supply unit.