JPH0612927A - Composite wire manufacturing method - Google Patents

Abstract

(57) [Abstract] [Purpose] To provide a method for manufacturing a composite wire, which improves the bondability between a metal core wire and a coated metal and can perform wire drawing without breaking. [Structure] After degreasing and pickling on the surface of the metal tape 12, a groove 26 having a regular triangular cross section is formed in the width direction 45
Make an angle of 10 ° and make 10 to the thickness of the metal tape 12.
At a depth of%, a plurality of lines are crossed with each other to form a mesh. The metal tape 12 is formed into a substantially tubular shape so as to surround the metal core wire 18 with the surface on which the groove 26 is formed inside. Next, after both edges of the metal tape 12 are brought into contact with each other and welded, the tubular metal tape 12 is reduced in diameter to
12 and the metal core wire 18 are drawn to form a composite.

Description

Detailed Description of the Invention

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a method for manufacturing a composite wire.

[0002]

2. Description of the Related Art Conventionally, as a continuous manufacturing method of a long product of a composite wire in which a metal different from the metal core wire is coated around the metal core wire, for example, a plating method of plating a coating material on the peripheral surface of the metal core wire. , And a metal tape is formed in a substantially tubular shape as a covering material around the metal core wire, and both edges thereof are brought into contact with each other and welded, and then wire drawing is performed to form a composite of the covering material and the metal core wire. The law is taking place.

The plating method is generally used in the production of copper-coated steel wire. However, in order to manufacture a copper-coated steel wire having high conductivity, it is necessary to increase the thickness of the covering material, but the plating method results in a large manufacturing cost.
On the other hand, according to the tape welding drawing method, a copper-coated steel wire having a thick coating material can be manufactured at a relatively low manufacturing cost.

In such a tape welding drawing method, in order to improve the bondability between the metal core wire and the metal tape and improve the wire drawability, the surface of the metal tape which is in contact with the metal core wire is polished by, for example, a metal brush. Various mechanical polishing and pickling are performed.

Of these, the mechanical polishing removes the scale adhering to the contact side surface of the metal tape. In addition, a new interface inside the metal tape not exposed to the oxide film by cutting the surface is exposed. Further, polishing causes work hardening in which the surface layer of the metal tape is hardened. After that, when the metal tape is formed into a substantially tubular shape and then subjected to wire drawing, a newly formed interface projects on the surface as the metal tape extends and adheres to the surface of the metal core wire. In particular, when work hardening occurs, the work hardened surface layer does not follow the elongation of the metal tape base material due to the reduced deformability. Therefore, a crack is preferentially generated in the cutting portion where the new interface is exposed, and the new interface easily projects. In order to improve the bondability between the metal core wire and the metal tape, it is important to increase the protrusion of the new interface as described above.

[0006]

However, in the conventional mechanical polishing, since the above-mentioned cutting portions are randomly formed in the polishing process, the direction, depth and distribution of the cutting portions become non-uniform. For this reason, when the longitudinal direction of the cutting part is substantially the same as the wire drawing direction of the composite wire, cracks are less likely to occur in the cutting part even if wire drawing is performed, and sufficient nascent interface protrusion is obtained. I can't. As a result, it is difficult to improve the bondability between the metal tape and the metal core wire. On the other hand, if the longitudinal direction of the cutting part is substantially perpendicular to the drawing direction of the composite wire, the cross-section cut when cutting in the width direction of the metal tape at the location where such a cutting part is formed. Since the area is smaller than other areas, the wire tends to be broken, for example, when wire drawing is performed. As described above, in the conventional method of manufacturing a composite wire to which mechanical polishing is applied, the metal core wire and the metal tape are
It is difficult to manufacture a composite wire by improving the bondability with the wire and performing wire drawing without causing a wire break.

The present invention has been made in view of the above points, and provides a method for producing a composite wire having good bondability between a metal core wire and a metal tape.

[0008]

DISCLOSURE OF THE INVENTION According to the present invention, a metal tape made of a metal different from a metal core wire is provided on one side with a width direction of 30 °.
A groove having an angle of -60 ° and having a substantially V-shaped cross section was formed to a depth of 5 to 25% of the thickness of the metal tape, and the metal tape was formed with the groove. Molded into a substantially tubular shape so as to surround the periphery of the metal core wire with the surface inside, and weld both edges of the metal tape by abutting each other, and then drawing the tubular metal tape and the metal core wire. Then, there is provided a method for producing a composite wire, which comprises compounding the metal core wire and the metal tape.

The present invention will be described in more detail below.

The metal core wire used in the method for producing a composite wire of the present invention is not particularly limited as long as it is a metal or the like generally used as a core wire, but for example, copper wire, steel wire, titanium wire. Can be used.

The metal tape used in the present invention is
It is made of a metal different from the metal core wire. For example, oxygen-free copper strips, aluminum strips, copper annealing tapes, copper alloy tapes, stainless tapes, and titanium tapes can be used.

A large number of grooves are formed on one surface of such a metal tape. The groove is 30 ° from the width direction of the metal tape.
It is formed so as to form an angle of -60 °. The formation angle of the groove is limited to the range of 30 ° to 60 °, and when the formation angle of the groove is less than 30 °, the groove is close to parallel to the width direction of the metal tape. Therefore, the cross-sectional cross-sectional area obtained by cutting the finally obtained composite wire at right angles to the longitudinal direction is
This is because the size becomes very small depending on the cut portion, and therefore, for example, when the wire drawing treatment described below is performed, the composite wire may be broken at the portion having a small cross-sectional cross-sectional area. On the other hand, when the formation angle of the groove exceeds 60 °, the groove becomes nearly parallel to the longitudinal direction of the metal tape. For this reason, when the wire drawing treatment is performed, tension mainly acts on the groove in the longitudinal direction, so that the groove is less likely to be cleaved and a sufficient new interface projection cannot be obtained.

The groove is formed to have a substantially V-shaped cross section. If the cross-section of the groove is roughly square or circular, the inner surface of the groove that protrudes on the surface after wire drawing will have corners and roundness, so the protruding new interface will be flat. It is not preferable because it is difficult to become.

The depth of the groove is in the range of 5 to 25% of the wall thickness of the metal tape. When the groove depth exceeds 25% of the wall thickness of the metal tape, a gap is generated between the metal core wire and the metal tape in the composite wire after the wire drawing treatment, Since the ratio becomes too small, it is easy to cause wire breakage. On the other hand, when the depth of the groove is less than 5% with respect to the thickness of the metal tape, the newly-developed interface is less projected and the effect of the present invention cannot be sufficiently exhibited.

A large number of such grooves can be formed, for example, on one surface of the metal tape in parallel to each other and in the same direction. In order to project more new interfaces, it is preferable that the distance between adjacent grooves is as small as possible. Further, it is preferable that a large number of grooves intersect each other so as to form a mesh shape.

Prior to forming the groove as described above, the surface of the metal tape is preferably degreased and pickled to clean the surface of the metal tape. The surface of the metal core wire is preferably similarly subjected to degreasing and pickling treatment.

The metal tape as described above is formed into a substantially tubular shape so as to surround the periphery of the metal core wire with the surface having the groove formed inside. Then, both edges of the metal tape are brought into contact with each other and welded. After this, a tubular metal tape, for example,
After the diameter is reduced by a rolling device, for example, wire drawing is performed using a drawing die to composite the metal core wire and the metal tape. At this time, the groove is split along with the extension of the metal tape, and the new interface exposed on the inner surface of the groove is projected onto the surface of the metal tape and joined to the surface of the metal core wire. As a result, the metal core wire and the metal tape are firmly joined.

[0018]

According to the method of manufacturing a composite wire of the present invention, a groove is formed in advance on one surface of a metal tape to expose a clean new interface having no oxide film. Then, a metal tape is formed into a substantially tubular shape with the surface in which the groove is formed inside, and both edges of the metal tape are brought into contact with each other and welded, and then the tubular metal tape is drawn. , The groove is cleaved and the new interface is projected on the surface of the metal tape. As a result, the metal core wire and the metal tape are bonded via the extremely clean new interface, and the bondability between the two is improved.

Further, since the groove is formed at a predetermined angle with respect to the metal tape and has a predetermined depth, the new interface is easily projected by the wire drawing process and the cross section of the composite wire is cut. The area can be controlled to be substantially uniform. Thereby, the bondability between the metal core wire and the metal tape is remarkably improved, while it is possible to prevent the drawability of the composite wire from being lowered due to the formation of the groove.

[0020]

The case of producing a copper-coated steel wire to which the method for producing a composite wire of the present invention is applied will be described in detail below with reference to the drawings.

FIG. 1 is an explanatory view showing an example of manufacturing equipment used in the method for manufacturing a composite wire of the present invention.

Reference numeral 11 in the drawing denotes a metal tape supply device for supplying the metal tape 12. The metal tape 12 has a wall thickness of 1 m
An oxygen-free copper strip with a width of m and a width of 30.5 mm. The metal tape 12 supplied from the metal tape supply device 11 is fed to the degreasing tank 13
Then, the surface of the metal tape 12 was degreased with trichloroethylene. Then, the metal tape 12
Was introduced into the pickling apparatus 14, and the surface of the metal tape 12 was pickled.

After that, the metal tape 12 was passed between the rolling rolls 15 and 16 having protrusions corresponding to the grooves formed on the surface of the metal tape 12 on the peripheral surface, and groove processing was performed. The protrusion formed on the circumferential surface of the rolling roll 15 has a mesh shape in which a plurality of protrusions intersect with each other, and each protrusion is formed with respect to the rotation direction of the rolling rolls 15 and 16. Formed at an angle of 45 °. Such protrusions are formed on the rolling roll 16. Thus, as shown in FIGS. 2A and 2B, grooves 26 having an angle α of 45 ° with respect to the width direction of the metal tape 12 intersect with each other to form a mesh shape on one surface of the metal tape 12. Formed. The cross-sectional shape of the groove 26 is a substantially equilateral triangle, and the depth t of the groove 26 is t.
Was 0.1 mm. By such groove processing, the groove 26
A clean new interface having no oxide film was exposed on the inner surface of the.

On the other hand, a metal core wire 18 made of a steel wire having a diameter of 6.0 mm was introduced into the degreasing tank 19 from the metal core wire supplying device 17, and the peripheral surface was degreased in the same manner as the metal tape 12.

The metal tape 12 and the metal core wire 18 are introduced into the molding apparatus 20, and as shown in FIG.
The metal tape 18 is arranged so that the surface on the side where the groove 26 is formed faces the metal core wire 18 and surrounds the metal core wire 18 as shown in FIGS. 3B and 3C. 12 was formed into a pipe shape.

Next, the metal tape 12 and the metal core wire 1
8 is introduced into the TIG welding machine 21, and as shown in FIG.
As shown in (D), both edges of the metal tape 12 were brought into contact with each other and welded. The metal tape 12 was welded in an argon gas atmosphere (flow rate of 10 liters / minute) with a diameter of 3.2 in order to prevent oxidation of the welded portion and smooth the weld bead.
It was performed by TIG welding using a mm electrode rod.

After that, the metal tape 12 and the metal core wire 1
8 was introduced into the rolling device 22, and the metal tape 12 formed into a tubular shape was subjected to a diameter reduction process. Next, the metal tape 12 and the metal core wire 18 are passed through a drawing die 23 to have a diameter of 1 mm.
Wire drawing was performed up to mm to obtain a copper-coated steel wire 24 as shown in FIG. During this wire drawing process, a diffusion heat treatment was performed several times during the process so that the metal core wire and the covering material were joined together. The obtained copper-coated steel wire 24 was wound on a composite wire winding device 25.

According to the method for manufacturing the copper-coated steel wire 24 as described above, the groove 26 is cleaved during wire drawing, and the new interface exposed on the inner surface of the groove 26 projects to the surface so that the metal core wire 18 is formed.
Join with the surface of. As a result, the metal core wire 18 and the coated metal 24a are firmly combined. Further, since the groove 26 is formed at an angle of 45 ° with respect to the width direction of the metal tape 12, the cross-sectional sectional area when the metal tape 12 is cut in the width direction is always substantially uniform. Further, it is possible to prevent the tensile strength of the copper-coated steel wire 24 from being lowered, and it is possible to perform wire drawing up to a diameter of 1 mm without breaking the wire.

In order to confirm the effect of the present invention, the grooves 26 are formed in the width direction of the metal tape 12 at 0 ° and 20 °, respectively.
Angles of °, 30 °, 45 °, 60 °, 70 ° and 90 ° (hereinafter referred to as groove forming angles) are formed, and the cross-sectional shape is an equilateral triangle, and the depth is relative to the wall thickness of the metal tape 12. 1
Samples 1 to 6 were manufactured as described above using the metal tape formed so as to be 0%. In addition, using a metal tape whose surface is mechanically polished with a metal brush,
Sample 7 was manufactured in the same manner as described above. At this time, the diameter of each sample when it was able to be drawn without breaking (hereinafter referred to as the reached wire diameter during wire drawing) was examined. In addition, the diameter 1.0mm
Bending tests were conducted to evaluate the bondability of the wires that could be drawn up to this point. The results are shown in Table 1. In Table 1, those that can be bent 10 times or more are marked (circle), and those that are less than 10 times are shown as the number of times.

[0030]

[Table 1] As is clear from Table 1, the groove formation angle is 30 ° to 60 °.
In Samples 3 to 5, the bondability between the metal tape 12 and the metal core wire 18 is improved, and the cross-sectional cross-sectional area when the metal tape 12 is cut in the width direction is always substantially uniform. It is hard to break, and it can be drawn to a diameter of 1 mm without breaking, and the metal tape 12 did not peel even when it was bent 10 times or more in the bending test.

On the other hand, the groove forming angles are 0 ° and 20 °.
In Samples 1 and 2, the groove 26 is nearly horizontal to the width direction of the metal tape 12, and therefore, there is a portion where the cross-sectional area is remarkably reduced depending on the portion to be cut. Therefore, before drawing to a diameter of 1.0 mm. The wire was broken at the stage. In addition, the groove formation angle is 7
Samples 6 and 7 having 0 ° and 90 ° were able to be drawn to a smaller diameter than Sample 8 using the metal tape whose surface was treated by mechanical polishing, but the groove 26 had the metal tape 12 thereon. Since it is almost parallel to the longitudinal direction of the wire, the groove 26 is hard to be broken during wire drawing, and the newly formed interface cannot be sufficiently projected, so that the bondability between the metal tape 12 and the metal core wire 18 cannot be sufficiently improved, and the diameter is up to 1 mm. Was able to wire drawing,
In the bending test, sufficient bondability was not obtained.

Next, when the groove forming angle is 45 °, the groove 2
The depth of 6 is 3, 5, 2 with respect to the thickness of the metal tape 12.
Using the metal tape changed to 0, 25 and 30%,
Samples 8 to 11 were manufactured in the same manner as described above, and the drawability during wire drawing and the bondability were examined. The results are also shown in Table 1.

Samples 4 and 8 to 10 including the sample 4 prepared above, in which the depth of the groove 26 is within the range of 5 to 25% of the wall thickness of the metal tape 12, have a sufficient protrusion of the new interface. As a result, the wire can be drawn to a diameter of 1 mm without breaking the wire, and sufficient bondability is shown in the bending test. On the other hand, in the sample 12 in which the depth of the groove 26 is 30% of the wall thickness of the metal tape 12, the groove 26 is too deep, and therefore the cross-sectional cross-sectional area of the metal tape 12 becomes small, so that the tensile strength is The wire was broken when it was drawn to a relatively low and relatively large diameter. Further, the depth of the groove 26 is such that the metal tape 12
Sample 13 having a thickness of 5% of the thickness of No. 1 had no groove processing effect because the groove 26 was too shallow, and wire drawing was possible up to a diameter of 1.0 mm, but sufficient bondability was not obtained in the bending test. .

In this embodiment, the case of producing a copper-coated steel wire has been described, but the same applies to the production of a composite wire in which other dissimilar metals such as aluminum-coated steel wire and aluminum-coated copper wire are combined. It can be effective.

[0035]

As described above, according to the method of manufacturing a composite wire of the present invention, a groove for making a new interface project is formed on the surface of the metal tape to be joined with the metal core wire. The bondability with the metal core wire is remarkably improved, and the mechanical strength is maintained by forming the groove at a predetermined angle and depth. As a result, the bondability and wire drawability are improved, there is no risk of disconnection during wire drawing, and industrially high-quality composite wire can be efficiently produced, which is a remarkable effect.

[Brief description of drawings]

FIG. 1 is an explanatory view showing an example of manufacturing equipment used in a method for manufacturing a composite wire of the present invention.

FIG. 2 (A) is a plan view showing a metal tape used in the method for producing a composite wire of the present invention, and FIG. 2 (B) is BB ′ in (A).
Sectional drawing of the metal tape cut | disconnected along the line.

3 (A) to 3 (E) are explanatory views each showing a step of compounding a metal core wire and a metal tape in the method for manufacturing a composite wire of the present invention.

[Explanation of symbols]

11 ... Metal tape supply device, 12 ... Metal tape, 13,
19 ... Degreasing tank, 14 ... Pickling treatment device, 15, 16 ... Rolling roll, 17 ... Metal core wire supplying device, 18 ... Metal core wire, 2
0 ... Forming device, 21 ... TIG welding machine, 22 ... Rolling device,
23 ... Drawing die, 24 ... Composite wire, 26 ... Groove.

 ─────────────────────────────────────────────────── ─── Continuation of front page (72) Inventor Hidemichi Fujiwara 2-6-1, Marunouchi, Chiyoda-ku, Tokyo Furukawa Electric Co., Ltd.

Claims (1)

[Claims] 1. A groove having an angle of 30 ° to 60 ° with the width direction and having a substantially V-shaped cross section is formed on one side of a metal tape made of a metal different from the metal core wire in the wall thickness of the metal tape. The metal tape is formed to have a depth of 5 to 25%, and the metal tape is formed into a substantially tubular shape so as to surround the periphery of the metal core wire with the surface having the groove formed inside, and both edges of the metal tape. After abutting against each other and welding, the tubular metal tape and the metal core wire are drawn to form a composite of the metal core wire and the metal tape.