JPS61154777A - Production of cored wire - Google Patents

Abstract

PURPOSE:To improve joining property and compounding ratio by plating preliminarily a metal of the same kind to the surface of a core wire then filling an inert gas into the formed pipe and subjecting the same to seam welding. CONSTITUTION:The core wire plated with the metal of the same kind as a metallic tape (a) is cleaned and is then introduced into a forming device 5, by which the metallic tape (a) is formed around the core wire (b). The tape (a) is subjected to seam welding by a welding device 6. The inert gas is filled from an inert gas supply device into the pipe formed in such a manner, by which TIG welding is executed. The wire is further passed through a cooler 7, a rolling device 8 and dies 9, 10 by which the cored wire C is obtd. The joining property and compounding ratio of the wire C are improved by the formation of the cored wire C to 1-5mm core diameter and 0.2-2mm tape thickness and the use of the inert gas.

Description

Detailed Description of the Invention [Industrial Field of Application] The present invention relates to a method for manufacturing a composite wire in which a metal core wire is coated with different metals, and in particular has excellent bondability between the core wire and the coating layer, and a composite wire with a low composite ratio ( This facilitates the production of composite wires with a large diameter (core wire diameter/composite wire diameter).

[Conventional technology]

In general, methods for manufacturing composite wire include a casting method in which dissimilar metals are cast into a metal pipe and this is drawn on the wire drawing side, a tube drawing method in which a dissimilar metal rod is inserted into a metal vibrator and the wire is drawn, The plating method in which the surface of the core wire is plated with dissimilar metals, and the tape welding drawing method in which dissimilar metal tape is formed into a pipe shape around the metal core wire, the butt portions are seam welded, and then the wire is processed are known. There is. Since the casting method and the tube drawing method cannot continuously produce long products and are expensive, the plating method and tape welding drawing method are mainly used.

(Problems to be Solved by the Invention) The above plating method is suitable for continuous production of composite wires with a small composite ratio, but is not suitable for manufacturing composite wires with a large composite ratio, and has the drawback of high cost. be. In addition, the tape welding drawing method is suitable for the continuous production of composite wires with a high composite ratio, but the bonding between the core wire and the coating layer is insufficient, and the coating layer may peel off during the wire drawing process after composite, or bulge breakage may occur. On the other hand, there are problems such as the core wire being easily broken. In other words, wire drawing with dies is used to reduce the diameter of metal tape after seam welding, but since a straight line is required until joining,
The clearance between the core wire and the pipe during seam welding is reduced, and the joint is performed in one drawing process. Furthermore, as the clearance is increased, a method is used in which caterpillar pulling machines are arranged in multiple stages and the parts are drawn one by one. Therefore, the former is susceptible to joint failure due to the influence of the core wire, and the latter has the drawback that the manufacturing process is long and is difficult to put into practical use. Has there been any attempt at diffusion bonding the core wire and coating layer?In order to diffusion bond dissimilar metals, the surfaces of the core wire and metal tape must be cleaned and mechanically polished. In addition, it is necessary to fully activate the wheat by polishing (in order to prevent surface oxidation of the wheat, it must be kept in a completely non-oxidizing atmosphere until bonding, which requires a large amount of construction work. Not only that, but the heat treatment for diffusion bonding requires high temperatures and long hours due to dissimilar metals; for example, bonding steel wire and copper tape requires 8
It is necessary to perform heat treatment at 00C or higher for 5 or more stations.

Means for Solving Problem C] In view of this, the present invention has been developed as a result of various studies, and it is possible to easily manufacture a composite wire that has excellent bonding properties between the core wire and the FM layer and has a particularly thick composite ratio. This is a newly developed manufacturing method in which a dissimilar metal tape is formed into a pipe shape around a metal core wire, the butt portions are seam welded, and the diameter is reduced to avoid joining. It is characterized by plating the same type of metal as the metal tape, filling the formed pipe with inert gas, and seam welding.

That is, as shown in FIG. 1, the present invention provides a feeding device (1), (
After cleaning the surface through the degreasing and cleaning devices (3) and (3'), the metal tape (a) is introduced into the forming device (5) through the determining device (4), and the width of the metal tape (a) is determined.
is formed into a pipe shape around the core wire (b), and then the butt portions of the metal tape (-) are seam-welded using the welding device (b). Inside the pipe molded by the molding device (5) is a width determining device (4) and a molding device (5).

As shown in (b), the gas injection pipe (14) of the inert gas supply device (13) is filled with inert gas, and the welding device (5) is welded using a known TIG welding device,
The injection section (14) guides the core wire (b) while injecting inert scum through the core wire (b) inside.

In this way, a metal tape was formed into a pipe shape around the core wire (b) and seam welded (twisted, cold f!
) colder,! After the J1 roll is rolled, it is rolled from the welded state shown in FIG. 3(a) to the reduced diameter state shown in FIG. It is pressed into the pushing die (9) by the feeding force of the roll, and the diameter is reduced as shown in Fig. 1 (c).
, and then pass it through a drawing die (10) to draw and join the composite wire shown in Figure 1, 2), and then pass it through a drawing device (10).
1), the composite wire (C) is taken up by the winding device (12).

[Function] By plating the same type of metal as the metal tape on the surface of the core wire, the present invention becomes a composite of the same type of metal, and the bonded surface requires only degreasing and cleaning, and mechanical R11 polishing is not necessarily required. It may be simple enough to prevent oxidation due to welding heat, and even in the case of diffusion bonding, temperature and time conditions similar to those of normal annealing are sufficient. In addition, the present invention reduces the diameter of the pipe after welding by rolling it with a grooved roll and passing it through two dies: a pushing die and a handling die, so it is possible to increase the clearance between the core wire and the pipe during welding, and to ensure a sound The welded state can be maintained and the line length required for diameter reduction can be shortened.

Therefore, it is desirable to use a metal wire with a diameter of 1 to 5 mm as the core wire and a metal tape with a thickness of 0.2 to 2 mm as the tape.If the core wire diameter is less than 1#, it will be substantially difficult to join, If the thickness exceeds 0.05, the rigidity of the core wire increases and has a negative effect on welding, and the tape thickness exceeds 0.
If it is less than 2m, there will be frequent welding defects and it will be difficult to press fit into the indentation die, and if it exceeds 2111111, forming
Welding becomes difficult. Also, the composite ratio of the joined composite wire is 0.
2 to 0.8 is desirable; if the composite ratio is less than 0.2, the core wire is likely to break during subsequent processing (,0,
If the diameter exceeds 8, it will be disadvantageous in terms of cost compared to the conventional METS 4i'A. [Example] Copper METS 1 with diameters of 0, 6 to 5, and 5 mm - steel wire and plate thickness of 0.1 to 2.2m oxygen-free copper strip (plate r125mm
The thick copper-coated steel wires shown in Table 1 were manufactured using the above method.

As shown in Figure 1, the copper-plated steel wire and the oxygen-free copper strip were first cleaned in a trichlorethylene degreasing tank, and then the oxygen-free copper strip was slit to a width of 21 mm using a width setting device, and then inserted into a forming device. It was molded into a pipe shape with an outer diameter of 7 mm. The copper-plated steel wire has an outer diameter of 6 mm and a wall thickness of 0.2 m, as shown in Figure 2.
The argon gas is passed through the molding device through an argon gas injection tube made of a stainless steel tube, and the injection tube injects argon gas into the molded vibrator at a rate of IJ/min to prevent oxidation of the weld and to smooth the inner weld bead due to internal pressure. We aim to
High frequency TIG welding was performed on the butt portions of the pipes. Welding was carried out using a Trikune electrode rod with a diameter of 2.4 mm, the welding current was varied from 150 to 300 A depending on the thickness of the oxygen-free copper strip, and the bipulse current ratio was kept constant at 15%.

After welding the pipe in this way, it is immediately cooled with water and dried with an air wiper, then continuously rolled to reduce its diameter with grooved rolls, and further pressed and handled to form copper-plated 14WA and oxygen-free copper strips. Two pipes were joined together to form a composite line.

In addition to examining the welding condition of these composite wires, the diameter o,
The wire drawability up to 5 mm and the electrical conductivity after wire drawing were investigated. These results are also listed in Table 1.

The wire drawability is 3.5 mt* in diameter during processing.2.
5Wm+.

1. Softening heat treatment was performed at 500°C for 30 minutes at Os.

As is clear from Table 1, the thickness is between 0.2 and 2 mm.
Invention method Nα1 using a bare copper strip and a core wire with a diameter of 1 to 5 mm
In the composite wires according to No. 1 to 17, the bond between the oxygen-free copper strip and the copper-plated decoy was good, and the wire could be drawn to a diameter of 0.5 mm. Also, the conductivity of this copper 'N fll wire is 44.
3-96.4% lAC3, composite ratio 0.20-0.79
The finished product was in good condition with no wrinkles in the coating layer or breaks in the core wire.

On the other hand, in Comparative Methods ~018-19 in which the thickness of the oxygen-free copper strip was less than 0.2 mm, there were many pinholes in the welded piece, and the coating layer buckled during indentation wire drawing. In addition, the thickness of the oxygen-free copper strip is 2
Comparative methods No. 024 to 25, which exceeded mm, were difficult to form into small-diameter pipes, were not stable during welding, and failed to yield good composite wires.

Furthermore, comparative method Nos. 19 to 20 where the diameter of the core wire exceeds 5 mm
Due to the high rigidity of the core wire, many troubles occurred during pipe forming, welding, and rolling, and in Comparative Method No. 22 to 23, where the core wire diameter was less than 1 mm, sufficient pressure was applied between the core wire and the formed/welded pipe. No, good bonding is not achieved,
The core wire broke during wire drawing.

Although the production of copper-covered wire has been described above, copper-covered aluminum wire and aluminum-covered steel wire can also be easily produced in the same manner.

[Function of the Invention] As described above, the present invention has industrially significant effects in that the core wire and the coating layer can be easily bonded, and a composite wire with a high composite ratio can be manufactured using compact equipment.

[Brief explanation of drawings]

Figure 1 is an explanatory diagram of the production line of the present invention, and Figure 2 is (
A) and (B) show the inert dregs feeding system, (A) is a side view, (B) is a cross-sectional view taken along the Δ-A' line from t to (A), and Figure 3 (A) is a side view. . (b), (c), and (d) show the diameter reduction state in each process of the manufacturing line, so (a) is a cross-sectional view of the welding process,
(B) is a cross-sectional view of the rolling process, (C) is a cross-section 14 of the pushing die process, and (-) is a cross-sectional view of the pulling die process. a... Metal tape b... Core i♀C...
- Composite wire 1... Tape supply device 42... Core wire supply device 3.
... Degreasing cleaning device 4... Width determining device 5...
Forming device 6... Welding device 7... Cold W
Device 8... Rolling device 9... Pushing die 1o... Drawing die 11... Taking-off device 12... Winding device 13... Inert gas supply device 14... Gas injection pipe agent Patent attorney Kiyoshi Minoura. Figure 1

Claims (4)

[Claims] (1) In the manufacture of composite wires, in which a dissimilar metal tape is formed into a pipe shape around a metal core wire, the butt portions are seam welded, and then the tape is joined by reducing the diameter, the surface of the core wire is preliminarily coated with a tape of the same type as the metal tape. A manufacturing method for composite wire that is characterized by plating metal, filling the formed pipe with inert gas, and seam welding. (2) The composite according to claim 1, in which the diameter is reduced by using a grooved roll in the diameter reduction process, and then the diameter is reduced by press-fitting into a pushing die provided at the exit of the final roll, and then joining by passing through a drawing die. Method of manufacturing wire. (3) Diameter 1 to 5 plated with the same type of metal as the metal tape
Claim 1 or claim 1, which uses a core wire of 1.0 mm in diameter and a metal tape with a thickness of 0.2 to 2 mm to form a composite wire with a composite ratio (core wire diameter/composite wire diameter) of 0.2 to 0.8. A method for manufacturing a composite wire according to item 2. (4) A method for manufacturing a composite wire according to claim 1, 2 or 3, in which a copper-clad steel wire is used as the core wire and a copper tape is used as the metal tape.