JP2023180800A - Production system and production method of copper wire rod - Google Patents

Abstract

To produce a copper wire rod suitable for a conductor for a coil.SOLUTION: A production system 1 of a copper wire rod includes: an original wind roller 2 which supplies a DIP material produced by a dip forming method; a cleaning device 6 which cleans the DIP material; and a conform extrusion device 8 which performs conform extrusion of the DIP material. The cleaning device 6 cleans a surface of the DIP material through ultrasonic hot water cleaning. In the conform extrusion device 8, a coining roll pressure is controlled.SELECTED DRAWING: Figure 1

Description

The present invention relates to a copper wire manufacturing system and manufacturing method.

Conventionally, upcast materials and DIP materials have been known as representative examples of copper wire materials made of oxygen-free copper. "Upcast material" is a copper wire material manufactured by an upcast method in which molten copper is solidified in a mold and continuously pulled upward. "DIP material" is a copper wire material manufactured by a dip forming method in which molten copper is continuously solidified on the outer periphery of a core rod. In Patent Documents 1 and 2, conform extrusion is performed on an upcast material to achieve a processed structure that has excellent surface properties and is composed of fine crystal grains.

Japanese Patent Application Publication No. 2016-193450 Patent No. 6233634

However, even if conform extrusion is performed using upcast material, the copper wire material tends to have a slightly high hardness (characteristic value of 0.2% proof stress), and the copper wire material after conform extrusion is used as a winding conductor. When used as a material, the processing characteristics will be affected.
Therefore, the main object of the present invention is to provide a system and method for manufacturing a copper wire material that is flexible and has excellent processing characteristics and is suitable for use as a winding conductor.

According to one aspect of the present invention to solve the above problems,
a supply device that supplies DIP material by dip forming method; a cleaning device that cleans the DIP material;
and a conform extrusion device for conform extruding the DIP material,
A copper wire manufacturing system is provided, wherein the cleaning device performs ultrasonic hot water cleaning, steam cleaning, or water cleaning on the surface of the DIP material, and the conform extrusion device controls coining roll pressure. .

According to another aspect of the invention:
a step of preparing a DIP material by a dip forming method; a step of cleaning the DIP material;
and a step of conform extruding the DIP material,
In the step of cleaning the DIP material, the surface of the DIP material is subjected to ultrasonic hot water cleaning, steam cleaning, or water cleaning, and in the step of conform extruding the DIP material, coining roll pressure is controlled. A method of manufacturing a wire is provided.

According to the present invention, a copper wire material suitable for a winding conductor can be manufactured.

FIG. 1 is a diagram showing a schematic configuration of a copper wire manufacturing system. FIG. 1 is a diagram showing a schematic configuration of a conform extrusion device.

Hereinafter, a copper wire material and a method for manufacturing the same according to a preferred embodiment of the present invention will be described. In this specification, with respect to the description of "~" indicating a numerical range, the lower limit and upper limit are included in the numerical range.

[Copper wire material]
(1) Composition The constituent material of the copper wire is oxygen-free copper.
"Oxygen-free copper" refers to copper containing 99.96% by mass or more of Cu, with the remainder consisting of unavoidable impurities, and the total content of unavoidable impurities is preferably 0.03% by mass or less. Since the lower the oxygen content in oxygen-free copper, the better the conductivity, it is 0.001 mass % (10 mass ppm) or less, preferably 0.0005 mass % or less (5 mass ppm or less).

(2) Shape The copper wire can have various cross-sectional shapes that can be molded by conform extrusion.
For example, a round wire with a circular cross section has excellent workability during extrusion and tends to be a copper wire material with excellent surface properties, shape accuracy, and dimensional accuracy. In addition, copper wires with a rectangular cross section, especially rectangular copper wires with an aspect ratio (ratio of major axis to minor axis, major axis/minor axis) of 10 or less, and rectangular copper wires with an aspect ratio close to 1 such as squares. The copper wire may be rectangular, or may have an irregular cross section such as a polygon or an ellipse.

(3) Size Copper wire can take various sizes.
For example, an example of a copper wire material is one having a cross-sectional area of about 4 to 150 ^mm.sup.2 . When the copper wire material is a round wire, for example, the wire diameter is about 3 to 13 mm. When the copper wire material is rectangular, for example, it has a thickness of about 1 to 8 mm and a width of about 5 to 35 mm.
Since the copper wire according to this embodiment has high elongation and excellent workability, it is possible to manufacture irregularly shaped wires such as rectangular wires by rolling, for example, without wire drawing. Therefore, by using a copper wire having a cross-sectional area within the above range, it is possible to manufacture a deformed wire such as a rectangular wire having a large cross-sectional area. The copper wire according to this embodiment has high elongation without additional heat treatment such as softening treatment even when the cross-sectional area is 100 mm ² or less, or even 90 mm ² .

(4) Electrical conductivity The copper wire material is made of oxygen-free copper and has high electrical conductivity. The conductivity is 100% IACS or more, preferably 101% IACS or more.

(5) Mechanical properties Copper wire material not only suppresses the so-called blistering phenomenon and has excellent surface properties, but also has excellent mechanical properties. In particular, the copper wire of this embodiment has excellent 0.2% proof stress at room temperature. For example, in a rectangular shape with a cross section of 2 mm x 5 mm, the 0.2% proof stress is 55 to 65 MPa, and in a rectangular shape with a cross section of 3 mm x 12 mm, the 0.2% proof stress is 0.2% proof stress at room temperature. The .2% yield strength is 60 to 70 MPa, and it tends to be softer than the case of conform extrusion of oxygen-free copper upcast material.
Since the copper wire material of this embodiment has such mechanical properties, it is suitable for severe bending processing.

[Copper wire manufacturing system, conform extrusion device, and copper wire manufacturing method]
(1) Copper wire manufacturing system FIG. 1 is a diagram showing a schematic configuration of a copper wire manufacturing system 1.
As shown in FIG. 1, a copper wire manufacturing system 1 is a so-called production line for copper wire, and includes an original winding roller 2, a straightening device 4, a cleaning device 6, a conform extrusion device 8, and a winding roller 10. These are arranged in this order along the conveyance direction of the copper wire.
A copper wire material to be subjected to extrusion processing is wound around the original winding roller 2. The copper wire is a so-called base material, and oil is attached to the surface as a residue. The original winding roller 2 is a supply device for supplying copper wire to each device after the straightening device 4. The straightening device 4 is a device that improves the straightness of the copper wire. The cleaning device 6 is equipped with an ultrasonic cleaning function, and is designed to clean the surface of the copper wire. The cleaning device 6 may have a steam cleaning function or a simple water cleaning function instead of the ultrasonic cleaning function. The conform extrusion device 8 is a device that introduces a copper wire into a space formed by a wheel, a shoe, and an abutment, and extrudes it using a die. The winding roller 10 is a device that winds up a copper wire.
In a copper wire manufacturing system 1, a copper wire is unwound from a former winding roller 2, straightened into a straight line by a straightening device 4, surface cleaned by a cleaning device 6, and forcibly extruded by a conform extrusion device 8. The film is then wound up by a winding roller 10.

(2) Conform extrusion device FIG. 2 is a diagram showing a schematic configuration of the conform extrusion device 20.
As shown in FIG. 2, the conform extrusion device 20 has a rotatably supported disc-shaped wheel 22, and an annular groove is formed on the circumferential surface of the wheel 22. A shoe 24 that covers a part of the groove is installed on the outside of the wheel 22 along the circumferential direction of the wheel 22, and functions as a lid that covers the part of the opening of the groove. An abutment 26 and a die chamber 28 are installed inside the shoe 24. An abutment 26 is installed at a predetermined position in a region of the groove of the wheel 22 covered by the shoe 24, and a die 30 is housed in a die chamber 28.

In the conform extrusion device 20, an extruded material (cast material) is introduced into a space surrounded by the concave groove of the wheel 22, the shoe 24, and the abutment 26, and the material accumulated in that space is extruded through the die 30. There is.
Specifically, when the extruded material is inserted into the groove of the rotating wheel 22, the extruded material is sequentially drawn into the above-mentioned space by the frictional force between the wheel 22 and the extruded material. The rotation speed of wheel 22 is preferably 8-10 rpm. Since the extruded material drawn into the space is substantially closed by the groove, the shoe 24, and the abutment 26, extrusion pressure is generated. Due to this extrusion pressure, the constituent materials of the extruded material flow into the material reservoir area of the die chamber 28 (the area surrounded by the groove, the abutment 26, and the die 30), and the flowing material is molded into the desired shape by the die 30. Extruded wire rods can be produced by extrusion. During extrusion, debris (burr) 32 is discharged from between the circumferential surface of the wheel 22 and the opposing surface of the circumferential surface of the abutment 26.

Note that the abutment 26 includes a convex portion having an outer circumferential shape roughly corresponding to the inner circumferential shape of the groove, and a pedestal portion integrally formed with the convex portion (not shown).
The convex portion is fitted so as to block a portion of the groove of the wheel 22 in the circumferential direction as described above. The convex part is a part of the concave groove so that when the convex part is fitted into the concave groove, a U-shaped gap is provided between the tip of the convex part and its vicinity and the bottom of the concave groove and its vicinity. dam up. During extrusion, this gap is always filled with a part of the extruded material, and the surplus is discharged as the above-mentioned waste 32.
The protrusion is arranged such that one surface of the pedestal, specifically, the opposing surface extending from the root of the protrusion to the side edge of the pedestal, faces the circumferential surface of the wheel 22.

Extruded materials generate heat due to frictional heat and deformation heat during extrusion. Therefore, a high temperature state (for example, 300° C. or higher) can be achieved automatically without using a separate heating means. The high temperature increases the plastic workability (extrudability) of the extruded material, making continuous extrusion possible. By separately preparing cooling means and heating means and adjusting the temperature of the die chamber 28 (dice 30), a desired extrusion state can be obtained.

As described above, in the conform extrusion device 20, when the extruded material (cast material) is introduced into the space surrounded by the concave groove of the wheel 22, the shoe 24, and the abutment 26, the coining roll is introduced immediately before the extruded material is introduced into the space. It is designed to control pressure.
Specifically, as shown in FIG. 2, a coining roll 34 that can be raised and lowered is installed at a portion facing the concave groove of the wheel 22 of the conform extrusion device 20, and the rolling amount of the coining roll 34 can be controlled. .

(3) Copper wire manufacturing method The copper wire manufacturing system 1 is used in the copper wire manufacturing method.
First, a DIP material is prepared by dip-forming copper wire, and the DIP material is fed from the original winding device 2 to subsequent devices, and passed through the straightening device 4, cleaning device 6, and conform extrusion device 8. It is wound up with a winding device 10.
During this time, the DIP material is straightened into a straight line by the straightening device 4.
Thereafter, the surface of the DIP material is cleaned by a cleaning device 6 to remove surface residue.
In the cleaning step, the surface of the DIP material is preferably cleaned with ultrasonic hot water.
Thereafter, the DIP material is conform extruded using a conform extrusion device 8.
In the conform extrusion step, coining roll pressure is controlled. Control of the coining roll pressure can be realized by adjusting the height of a holding member (not shown) that holds the coining roll 34, and preferably the height of the holding member is +3 mm from the normally set height. More preferably, it is set to +1 to +3 mm. For example, when the height of the holding member is set to +3 mm, the coining roll pressure is high (the amount of coining reduction is large), and when the height of the holding member is set to +5 mm, the coining roll pressure is low (the amount of coining reduction is small).

In the conform extrusion process, the gap (shoe gap g) created between the wheel 22 and the die chamber 28 (abutment 26) is set to a specific range.
The shoe gap g refers to the gap between the circumferential surface of the wheel 22 (the surface extending from the opening edge of the groove to the circumferential edge of the wheel 22) and the surface of the abutment 26 that faces the circumferential surface, and is greater than 0.50 mm. .Less than 30mm.
By setting the shoe gap g within this range, it is possible to produce an extruded wire rod with few defects such as blistering and excellent surface properties, as shown in the examples described later. Furthermore, when the extruded wire is subjected to wire drawing and rolling to produce a rectangular winding conductor (flat wire), this winding conductor has few defects such as blistering and has excellent surface properties. .
By setting the shoe gap g to more than 0.50 mm, the extrusion pressure that restrains the extruded material is eased, making it difficult to trap foreign matter, allowing the foreign matter to be sufficiently discharged as scrap 32, and making it difficult to form a foreign matter layer. It is thought that the blistering phenomenon caused by this becomes less likely to occur. In other words, a sufficient discharge path for foreign matter can be secured.
On the other hand, it is thought that by setting the shoe gap g to less than 1.30 mm, the extruded material can be appropriately restrained and extruded, making it difficult for foreign matter to be drawn in, making it difficult to form a foreign matter layer, and making it difficult for the swelling phenomenon to occur. It will be done.
The shoe gap g is preferably 0.75 mm or more and 1.25 mm or less, more preferably 0.80 mm or more and 1.20 mm or less, and 0.85 mm or more and 1.15 mm or less. Adjustment of the shoe gap g can be easily performed, for example, by adjusting the thickness of an adjustment member disposed between the pedestal and the storage part provided in the shoe 24 and accommodating the pedestal of the abutment 26. The adjusting member is, for example, a plate material, and by changing the number of plate members, the thickness of the adjusting member can be adjusted.

The extrusion speed and the temperature of the die chamber 28 can be appropriately selected depending on the size of the extruded material (cast material) and extruded wire. For example, the extrusion speed (m/min) may be 7 m/min or more, 9 m/min or more, and further 11 m/min or more. The temperature of the dice chamber 28 can be adjusted by separately providing heating means and cooling means, and examples thereof include 250° C. or more and 450° C. or less, and further 300° C. or more and 400° C. or less.

According to the present embodiment described above, the surface of the DIP material is subjected to ultrasonic hot water cleaning and the coining roll pressure is controlled at a constant level in the conform extrusion process, so that the coining roll pressure is controlled to a constant level, so that the surface of the DIP material is cleaned using copper suitable for the winding conductor while suppressing the blistering phenomenon. A wire rod can be manufactured (see Examples below).

(1) Preparation of samples Prepare an oxygen-free copper upcast material and a DIP material with a circular cross section of approximately 11 to 12 mm in diameter, and use the manufacturing system shown in Fig. 1 and the conform extrusion device shown in Fig. 2 to The cast material and the DIP material were conformally extruded to have a rectangular cross section and the sizes listed in Table 1.
Here, the coining roll pressure of the conform extrusion device was also controlled (the height of the holding member of the coining roll was set to +5 mm or +3 mm).

(2) Evaluation of sample A test piece was prepared according to JIS Z 2241, and the 0.2% proof stress was measured. A commercially available tensile tester was used for the measurement. Here, the gauge length GL was set to 250 mm.
At the same time, the appearance of the sample was observed to confirm the presence or absence of a swelling phenomenon.
Table 1 shows the measurement results and observation results.

(3) Summary As shown in Table 1, when comparing Samples 1 and 3 with Samples 2 and 4, the upcast material had a high 0.2% proof stress value although there was no swelling phenomenon. On the other hand, the DIP material had a low 0.2% proof stress value and was soft, and the swelling phenomenon was improved by controlling the coining roll pressure.
From the above, in order to manufacture copper wire suitable for winding conductors, it is useful to perform ultrasonic hot water cleaning on the surface of the DIP material in the cleaning process and to control the coining roll pressure to a constant level in the conform extrusion process. I understand.

1. Copper wire manufacturing system 2. Original winding roller (supply device)
4 Straightening device 6 Cleaning device 8 Conform extrusion device 10 Take-up roller 20 Conform extrusion device 22 Wheel 24 Shoe 26 Abutment 28 Dice chamber 30 Dice 32 Scrap 34 Coining roll

Claims (4)

a supply device that supplies DIP material by dip forming method; a cleaning device that cleans the DIP material;
and a conform extrusion device for conform extruding the DIP material,
The cleaning device performs ultrasonic hot water cleaning, steam cleaning, or water cleaning on the surface of the DIP material,
A copper wire manufacturing system, wherein the conform extrusion device controls coining roll pressure. The copper wire manufacturing system according to claim 1,
A production system for copper wire, characterized in that in the conform extrusion device, coining roll pressure is controlled by a coining roll reduction amount. a step of preparing a DIP material by a dip forming method; a step of cleaning the DIP material;
and a step of conform extruding the DIP material,
In the step of cleaning the DIP material, the surface of the DIP material is subjected to ultrasonic hot water cleaning, steam cleaning, or water cleaning,
A method for producing a copper wire material, characterized in that in the step of conform extruding the DIP material, coining roll pressure is controlled. In the method for manufacturing a copper wire according to claim 3,
A method for producing a copper wire rod, characterized in that in the step of conform extruding the DIP material, coining roll pressure is controlled by a coining roll reduction amount.

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