JPH0284495A - Method for plastic working and production of electrically conductive wire using the same method - Google Patents

Abstract

PURPOSE:To produce an electrically conductive wire suitable as power transmission lines, lead wires, etc., in a state of excellent work efficiency and safety by coating the surface of a nonferrous metal with a lubricating oil of a specific composition and subjecting the coated metal to plastic working using a die. CONSTITUTION:The surface of a nonferrous metal is coated with a lubricating oil prepared by blending a liquid polymer compound having preferably 300-50000cSt viscosity (at 40 deg.C) as a base oil with an additive consisting of animal or vegetable fats and oils and/or an aliphatic dicarboxylic acid. The resultant coated metal is then subjected to diameter reduction working using preferably a drawing die for draw working wires and then wire drawing working while forming a lubricating film with heat generated therefrom to produce the objective electrically conductive wire.

Description

[Detailed Description of the Invention] [Industrial Application Field] The present invention relates to a method for plastic working of nonferrous metals, and in particular, a method for manufacturing conductive wires for drawing power transmission lines, lead wires for electronic components, etc. by plastic working. Regarding.

[Prior Art] Wire materials such as power transmission lines and lead wires for electronic components, or composite conductive wires (hereinafter referred to as composite wires) in which non-ferrous metals such as copper and aluminum are coated on metal core wires, are wire materials such as power transmission lines and lead wires for electronic components. A wire rod of a predetermined size is manufactured by manufacturing a wire material by a known method such as warm extrusion or hot rolling, and reducing the diameter of the wire material using a wire drawing machine equipped with a drawing die. Industrially, conductive wires of predetermined dimensions are manufactured using a continuous wire drawing machine in which a plurality of wire drawing machines each having a drawing die are arranged on a line.

In the production of composite wires, since the deformation resistance of the core wire and the covering material are different, the cross-sectional area ratio of the core wire and the covering layer also changes as the wire is drawn. Therefore, the change in the cross-sectional area ratio between the core wire and the coating layer is predicted in advance, and the thickness of the coating layer of the wire material is determined in accordance with the change, and the wire is drawn.

Conventionally, in such wire drawing processing, liquid lubricants and powder-based lubricants have generally been used as processing lubricants.

As a liquid lubricant, the base oil is synthetic oil such as mineral oil or ester oil, or a mixture thereof, and various additives are added to it, such as "Petroleum Product Additives" (edited by Toshio Sakurai, Koshobo, May 1971). Some products contain oiliness improvers such as higher fatty acids and higher alcohols, as well as extreme pressure agents such as phosphorus, chlorine, and sulfur.

On the other hand, as the powder lubricant, metal soap powder such as calcium soap or sodium soap is used, and the powder is press-fitted between the wire material and the die to perform the wire drawing process.

For wire drawing of steel materials only, there is a lubricating oil (Japanese Patent Application Laid-open No. 1983-135198) in which gold 1'iC soap powder with a particle size of 100 μm or less is blended with polybutene. In addition, metal drawing lubricants containing paraffin wax, chlorinated paraffin, phosphite esters, or phosphate esters (Japanese Patent Application Laid-Open No. 153396/1982), oils or waxes, polymer dispersants, surfactants, etc. There is a lubricant dispersed in water (JP-A-55-147593).

[Problem to be solved by the invention] When drawing a wire using a continuous wire drawing machine, the diameter of the wire is reduced each time it passes through a drawing die, so it is necessary to increase the drawing speed toward the later stages. . The wire drawing speed in the final step may reach as high as 250 to 400 m/min.

Composite wires have strict requirements regarding the surface properties of the coating layer, uniformity of conductivity, etc. In particular, in order to keep the conductivity constant, the thickness of the coating layer is required to be uniform over the entire length of the conductive wire.

At the same time, the wire must have a good surface quality without "galling" caused by burning on the surface of the wire due to plastic working or "discoloration" due to deterioration of lubricating oil.

The surface quality of wire drawing is affected by the cross-sectional area ratio of the core wire and the coating layer, the shape of the drawing die, the drawing ratio, etc., but the influence of lubricants is especially large. However, speeding up is required.

To increase the speed of wire drawing, it is necessary to significantly improve the performance of lubricating oil.

In the past, various lubricants have been used to improve these problems, but no lubricant has been able to achieve both high speed wire drawing and good surface quality.

In general, lubricating oils with high viscosity are less likely to cause metal-to-metal contact and are effective in preventing seizure during wire drawing.

However, since the viscous resistance of the lubricating oil is large, the temperature increases during wire drawing, and as a result, the viscosity of the lubricating oil decreases and seizure occurs. Furthermore, the mechanical strength of the wire material itself decreases due to the rise in temperature during wire drawing, so the wire drawing speed of 100 to 150 m/min is almost the limit for conventional lubricating oils.

In addition, the above-mentioned high-viscosity lubricants have poor handling and workability when replenishing, and if they scatter around and adhere to equipment surfaces or floors, their high viscosity can cause work clothes, shoes, etc. to become sticky. However, this also poses a problem from a work safety standpoint, such as workers getting caught in the wire drawing machine or falling over.

On the other hand, lubricants suitable for wire drawing of steel materials are not suitable for processing nonferrous metals, especially soft materials such as copper or aluminum, and are likely to cause seizures, surface cracks, etc. Surface cracking is a phenomenon that occurs when the frictional force between the non-ferrous fully bending material and the die is greater than the shear resistance of the material itself.

Furthermore, since these lubricants contain a large amount of metal soap, they have the drawback of discoloring the surface of processed products and lowering their commercial value.

A lubricating oil for plastic working of aminium has a viscosity of 171.
000c S t (40° C.) or higher can be used. However, as mentioned above, the higher the viscosity of the lubricating oil, the less likely it is that the material and die will seize.
Although wire drawing is possible even at a wire drawing speed of n, high viscosity lubricating oil poses problems in terms of workability and safety as described above.

As mentioned above, conventional wire drawing using lubricants has had its drawbacks for many years.

A first object of the present invention is to provide a method for plastic working of nonferrous metals.

A second object of the present invention is to provide a method for producing a conductive wire, in which a non-ferrous metal material or a wire material in which a core wire is coated with the non-ferrous metal material is subjected to high-speed wire drawing using a wire drawing machine equipped with a drawing die.

Another object of the present invention is to provide a method for manufacturing a conductive wire with excellent workability and safety.

[Means to solve the problem] The features of the present invention are as follows.

(1) A lubricating oil containing a liquid polymer compound as a base oil and an additive selected from animal and vegetable oils and fats or aliphatic dicarboxylic acids is applied to the surface of nonferrous metals, and plastic processing is performed using a die. A method for plastic working non-ferrous metals, characterized in that plastic working is performed while forming a lubricating film on the surface of the non-ferrous metal using heat generated by the process.

(2) Viscosity is 300 to 50,000 cSt (4
2. The method for plastic working of non-ferrous metals according to claim 1, wherein a liquid polymer compound at a temperature of 0° C.) is used as the base oil.

(3) On the surface of a wire material made of a non-ferrous metal or a wire material whose core wire is coated with a non-ferrous metal, a liquid polymer compound is used as a base oil, and an additive selected from animal and vegetable oils and fats or aliphatic dicarboxylic acids is blended with this. The wire is drawn while a lubricating film is formed on the surface of the non-ferrous metal by the heat generated by applying lubricating oil and passing it through a drawing die for wire drawing to reduce the diameter of the wire material. Method of manufacturing conductive wire.

(4) On the surface of a wire material made of a non-ferrous metal or a wire material whose core wire is coated with a non-ferrous metal, a liquid polymer compound is used as a base oil, and an additive selected from animal and vegetable oils and fats or aliphatic dicarboxylic acids is blended with this. A reaction film of the non-ferrous metal and the lubricating oil additive is formed on the surface of the non-ferrous metal by the heat generated by applying lubricating oil and passing it through a drawing die for wire drawing to reduce the diameter of the wire material. A method for manufacturing a conductive wire, characterized in that wire drawing is performed while the wire is being drawn.

(5) Viscosity is 300 to 50,000c St (40
The method for producing a conductive wire according to item (3) or item (4) above, characterized in that a liquid polymer compound having a temperature of 10°C (°C) is used as the base oil.

(6) Viscosity is 300 to 50,000 cSt (4
0°C) of one or more base oils selected from polybutene, polymethacrylate, polyisobutylene, ethylene-α-olefin copolymer, and polyalkylene glycol98
~75% by weight, and 2 to 25% by weight of an additive selected from animal and vegetable oils and fats or aliphatic dicarboxylic acids having 5 to 36 carbon atoms.
The method for producing a conductive wire according to item (3) or item (4) above, characterized in that a lubricating oil containing the following is used.

(7) The method for manufacturing a conductive wire according to any one of (3) to (6) above, wherein the nonferrous metal is copper or aluminum.

(8) Lubricating the surface of a wire material made of non-ferrous metal or a wire material whose core wire is coated with non-ferrous metal, using a liquid polymer compound as a base oil and an additive selected from animal and vegetable oils and fats or aliphatic dicarboxylic acids. The wire is coated with oil and passed through a drawing die for wire drawing, and the wire is drawn while forming a lubricating film on the surface of the non-ferrous metal using the heat generated by reducing the diameter of the wire. Two or more wires are twisted together. A method for manufacturing a conductive wire, characterized by combining.

(9) Lubricating the surface of a wire material made of non-ferrous metal or a wire material whose core wire is coated with non-ferrous metal, using a liquid polymer compound as a base oil and an additive selected from animal and vegetable oils and fats or aliphatic dicarboxylic acids. A reaction film of the non-ferrous metal and the lubricating oil additive is formed on the surface of the non-ferrous metal by the heat generated by applying oil and passing it through a drawing die for wire drawing to reduce the diameter of the wire material. A method for manufacturing a conductive wire, which comprises twisting two or more wires together.

Next, a method for manufacturing a conductive wire according to the present invention will be explained with reference to the drawings.

As shown in Figure 2, wire material-2 wound around supply 1
is guided by the first pulley 8, passes through the guide 3 of the wire drawing machine No. 1, applies lubricating oil 4 to the wire surface, and is reduced to the first stage wire diameter by the drawing die 5 and wire storage drum 7. is,
It is wound up on the drum 7.

Next, the wire is guided to the wire drawing machine NO12 by the next pulleys 8' and 8, and is reduced to the second stage wire diameter in the same manner as described above. This is then sequentially drawn to a predetermined wire diameter (No.
n) to be done.

Next, it is introduced into the processing chamber 9 and straightened through the straightening machine 1o, after which the lubricating oil adhering to the surface is removed using a solvent 11 and a rotating brush 12, and dried with an air blower 13. The dried conductive wire is wound around a winding drum 15 attached to a winding machine 14.

Next, the lubricating oil for wire drawing used in the present invention will be explained.

Lubricating oils include base oils and additives. Mineral oil can be considered as a common base oil. However, mineral oil has a viscosity index of 100 or less, and the rate of decrease in viscosity with respect to temperature rise is large. As a result, the adhesion force to the surface of the wire material is low, resulting in poor lubrication, which tends to cause seizure and breakage of the wire drawing material, making it impossible to draw the wire smoothly.Furthermore, if the drawing die temperature exceeds 120℃, such problems may occur. If mineral oil is used as the base oil, the wire drawing surface will discolor, so it is not suitable for high-speed wire drawing processing.

The present inventors have discovered that a liquid polymer compound as a base oil does not interfere with the excellent lubricating performance of the additives animal and vegetable oils and fats or aliphatic dicarboxylic acids, has a small decrease in viscosity with temperature rise, and has a low viscosity drop on the surface of the wire material. They discovered that it has excellent adhesion and heat resistance, leading to the present invention.

Examples of the liquid polymer compound include polybutyne, polymethacrylate, polyisobutylene, and ethylene-α-olefin copolymer.

The above-mentioned liquid polymer compound is a liquid polymer that can be synthesized by a known method, and its viscosity can be freely adjusted by changing its molecular weight or selectively blending compounds with different molecular weights.

As a base oil consisting of the liquid polymer compound.

From the viewpoint of wire drawing conditions, workability, handling, etc., 40℃
It is preferable that the viscosity is in the range of 300 to 50,000C8t.

Examples of additives (fJ lubricity improvers) to be added to the base oil include animal and vegetable oils such as hydrogenated castor oil, lard, linseed oil, soybean oil, hydrogenated tallow oil, and lanolin.

Similarly, aliphatic dicarboxylic acids have 5 to 5 carbon atoms.
36 is preferable 1 For example, glutaric acid, udipic acid,
pimelic acid, speric acid, azelaic acid, cepatic acid,
undecanoic acid, dodecanoic acid.

Examples include tridecane diic acid and dimer acid.

The blending amount of the animal and vegetable oil or fat or aliphatic dicarboxylic acid with respect to the liquid polymer compound that is the base oil is 2 to 25% by weight, preferably 5 to 20% by weight. If the amount of the animal or vegetable oil or fat or aliphatic dicarboxylic acid blended is less than 2% by weight, the effect of improving lubricity will be insufficient and seizure will easily occur during wire drawing. Further, even if the amount is more than 25% by weight, the anti-seizure effect will not be improved any further.

The lubricating oil used in the wire drawing process of the present invention may contain oiliness improvers such as higher fatty acids and higher alcohols, phosphorus, chlorine, and sulfur-based extreme pressure agents, or metal soap powder, as necessary. can. Furthermore, water or the like can be added to the above lubricating oil to form an emulsion type lubricating oil. In this case, known emulsifiers can be added.

Furthermore, according to the present invention, a composite wire in which the core wire material of the composite wire is a superconducting material and the coating layer is made of a non-ferrous metal such as copper or aluminum can be similarly drawn at high speed.

In addition, although the present invention was mainly explained using the wire drawing method above, parts can be similarly formed by plastic working of general non-ferrous metals.

[Function] The lubricating oil used in the present invention has a small decrease in viscosity with temperature, is thermally stable, and has excellent adhesion to the material surface, so it forms a good lubricant film on the friction surface during plastic working ( form an oil film). In particular, a film formed by the reaction between the surface of the non-ferrous metal material and the animal/vegetable oil or aliphatic dicarboxylic acid that is an additive of the lubricating oil is formed on the plastically processed surface.
Because it has excellent lubrication performance, it prevents plastic processing seizure of nonferrous metals and facilitates plastic processing.

It is assumed that the reaction film is mainly caused by the reaction between the surface of the non-ferrous metal material and the additive due to frictional heat from the die during plastic working, forming a film of metal soap (Sakurai: Current status of lubricating oil additives) And the future: lubrication.

15, No. 6302-310.1970).

The metal soap film is effectively formed at the local contact area between the die and the material surface, and becomes a strong film.

Prevents "seizing" caused by direct contact between the die and the raw metal. Therefore, smooth plastic working is possible.

The effect is particularly great in wire drawing, and seizure does not occur even in unprecedented high-speed wire drawing.

[Example] EXAMPLES The present invention will be specifically described below with reference to Examples.

Examples 1 to 11 Using polyisobutylene of 40"C and a viscosity of 650 cSt as a lubricating base oil, 10% by weight of the oils and fats shown in Table 1 and aliphatic dicarboxylic acids were added and dissolved by heating to prepare lubricating oils. A composite wire material having a steel core and one surface coated with copper was drawn using a wire drawing machine shown in Fig. 1.A schematic diagram of the die part is shown in Fig. 3.

A composite wire material 1 wound around a supply 1 is guided by a guide 3, and while being dip-coated in lubricating oil 4, its diameter is reduced by a drawing die 5 equipped with a thermocouple 6, and then the material is reduced in diameter to a drum 7 attached to a wire drawing machine.
Wind it up.

Next, after the strain was corrected through a straightening machine 10 installed in the processing chamber 9, the lubricating oil adhering to the wire drawing surface was removed with a rotating brush 12 while spraying a trichloride solvent 11. After removing the solvent with an air blower 13, this was wound up with a winding drum 15 attached to a winder 14.

Visually check the surface after wire drawing! 11irI! I had it. In addition, the rising temperature of the drawing die [(temperature during processing)−(initial temperature)] was measured.

The results are shown in Table 1. The wire drawing process was performed under the following conditions.

Wire material: [Material coated with copper.

(Cu-steel wire rod) Die shape: Reduction angle 2 degrees Diameter 2
．． Conical die machining rate of 89mm bearing length 2mm: 20.4% (diameter 3.24mm)
2.89 Proverb ■ Wire drawing) Processing speed: 110m/
min Die temperature: room temperature 12°C Table O: Very good, Q: Good, Δ: On the verge of seizure, ×: Seizure Comparative Examples 1 to 7 The lubricating oils used in each comparative example are shown in Table 2, with parentheses The numerical value inside indicates the viscosity (C5t) at 40°C.

Table 2 Example 12 A composite wire material in which the surface of a steel core wire was coated with aluminum using a lubricating oil having the same composition as in Examples 1 to 11 was drawn using the wire drawing machine shown in FIG.

Table 3 shows the results of visual inspection of the surface properties (seizing and surface cracks) and die temperature rise after wire drawing.

Moreover, when the roughness of the wire surface after wire drawing was measured using a roundness measuring machine (EC-43 manufactured by Koita Research Institute), it was approximately ±2 μm in the circumferential direction.

In the same manner, the surface roughness of Comparative Example 2 (using polybutene) and Comparative Example 5 (using polybutene + calcium soap) was measured, and the surface roughness was about ±4 μm in both cases.

Examples 13 to 38 A lubricating oil obtained by heating and dissolving the base oil, fat, and aliphatic dicarboxylic acid shown in Table 4 was heated to 15 to 17°C using the same wire drawing machine as in Example 2 to produce aluminum coated steel I! The material was wire-drawn, and the die temperature rise and the properties of the wire-drawing surface were investigated.

The results are shown in Table 4.

From the results shown in Table 4, when the amount of oil or fat or aliphatic dicarboxylic acid is less than 2% by weight, the die temperature rises rapidly. Moreover, the wire drawing surface is on the verge of seizure. If the blending amount exceeds 20% by weight, the improvement in properties tends to be saturated.

Example 39 Using the same aluminum-coated steel wire material as in Example 2, a lubricating oil containing 10% by weight of lanolin and polybutene with a viscosity of 2oO to 300,000C8t at 40°C was used at a processing rate of 20 using the wire drawing machine shown in Figure 1. %, and the relationship between the viscosity of the base oil and the temperature rise of the die was measured. The results are shown in Figure 4.

When the viscosity becomes 300 cSt or less, the die temperature rise increases. In addition, when drawing was stopped once and wire drawing was performed again, the wire sometimes broke. On the other hand, when the temperature exceeds 35,0000cSt, the die temperature begins to rise, and the amount of lubricating oil taken out increases, resulting in a single head. It tends to adhere to wire drawing machines, winding drums, floors, etc.

The viscosity of the lubricating oil is important from the viewpoint of workability and safety, especially the ease of handling when replenishing the lubricating oil.

It is up to about 50,000 cSt.

Example 40 Ethylene α with 40'Cl71 viscosity of 31.0OOC8t
Using a lubricating oil consisting of 90% by weight of olefin copolymer and 10% by weight of lanolin, an aluminum-coated steel wire material with a diameter of 8.4 mm was drawn in 11 steps using a continuous wire drawing machine shown in Figure 2. and evaluated its practical performance. Table 5 shows the processing conditions, surface properties after wire drawing, and the cross-sectional ratio of the core wire to the coating layer.

As can be seen from the results in Table 5, extremely good surface properties were exhibited and smooth wire drawing could be performed. Further, the cross-sectional ratio of the core wire to the coating layer was in the range of 34°8 to 36.0%, which was extremely good. Furthermore, when the lubricating oil that had adhered to the wire drawing surface after the 11th step was washed with TriClene solvent 11 and rotating brush 12 in the processing chamber 9 in FIG. It was possible to completely remove the lubricating oil.

Example 41: After the wire drawing process in #11 of Table 5, the attached lubricating oil was cleaned using Triclean. Example 41 The aluminum-coated conductive wire obtained in Example 40 (wire diameter
. I was able to get twisted wire.

Note that it is even more effective to use the lubricating oil during the wire stranding work.

Examples 42 to 52 and Comparative Examples 8 to 14 Ring-shaped aluminum material A2218(0) (JIS-H400) with diameter 63 mm x inner diameter 12 mm x thickness 12 mm shown in Fig.
]: Based on 400°C.

A lubricating oil having the same composition as in Examples 1 to 11 and Comparative Examples 1 to 7 was applied to the surface of the sample (2 hours → slow cooling to room temperature), and plastic working was performed at a processing speed of 40 pieces/min. 2000 parts having the shape shown in the figure were molded.

Table 6 shows the surface condition of the molded product. As is clear from the table, the processed products according to the present invention exhibited excellent surface properties without occurrence of burn-in or the like.

No. table O: Very good, 0: Good, Δ: On the verge of seizure.

X: Seizure [Effects of the Invention] According to the plastic working method of the present invention, non-ferrous metals can be plastic worked without seizure etc., and the surface properties of the parts after processing are also extremely excellent. We can provide quality non-ferrous fully bent parts.

It also has excellent seizure resistance even during high-speed wire drawing.

In addition, since it has high lubricity, high-speed wire drawing and high-speed wire stranding can be performed smoothly, and it is excellent in improving the quality and productivity of conductive wires.

Furthermore, according to the wire drawing method of the present invention, it is possible to provide a composite conductive wire that is sufficiently compatible with the conductivity (constant coating thickness).

Since the lubricating oil used in the wire drawing process of the present invention has a low viscosity,
It is also excellent in workability and work safety.

[Brief explanation of the drawing]

Fig. 1 is a schematic diagram of the wire drawing machine, Fig. 2 is a schematic diagram of the continuous wire drawing machine, Fig. 3 is a schematic diagram of the die section of the wire drawing machine, and Fig. 4 is the rise of the die when wire is drawn by the method of the present invention. A curve diagram showing the relationship between temperature and viscosity. Figure 5 is a cross-sectional diagram of the aluminum material before plastic working.
FIG. 6 is a cross-sectional view of the part after plastic working. 1-m-supply, 2-m-wire material, 3-m-
Guide, 4-m-lubricating oil, 5-11 drawing die,
6--Thermocouple, 71--Wire drawing machine drum, 8-
-One pulley, 9--processing chamber, 10-m-straightening machine,
11-11 solvent, 12--rotating brush, 13-
m-air blow 14-winding machine, 15-m-winding drum, 16--load cell. ---1 row i゛ section 1 layer oil spinning for dents (XI03 cSt/4o"C)

Claims (9)

[Claims] (1) A lubricating oil containing a liquid polymer compound as a base oil and an additive selected from animal and vegetable oils and fats or aliphatic dicarboxylic acids is applied to the surface of nonferrous metals, and plastic processing is performed using a die. A method for plastic working non-ferrous metals, characterized in that plastic working is performed while forming a lubricating film on the surface of the non-ferrous metal using heat generated by the process. (2) The method for plastic working of non-ferrous metals according to claim 1, characterized in that a liquid polymer compound having a viscosity of 300 to 50,000 cSt (40°C) is used as the base oil. (3) On the surface of a wire material made of a non-ferrous metal or a wire material whose core wire is coated with a non-ferrous metal, a liquid polymer compound is used as a base oil, and an additive selected from animal and vegetable oils and fats or aliphatic dicarboxylic acids is blended with this. The wire is drawn while a lubricating film is formed on the surface of the non-ferrous metal by the heat generated by applying lubricating oil and passing it through a drawing die for wire drawing to reduce the diameter of the wire material. Method of manufacturing conductive wire. (4) On the surface of a wire material made of a non-ferrous metal or a wire material whose core wire is coated with a non-ferrous metal, a liquid polymer compound is used as a base oil, and an additive selected from animal and vegetable oils and fats or aliphatic dicarboxylic acids is blended with this. A reaction film of the non-ferrous metal and the lubricating oil additive is formed on the surface of the non-ferrous metal by the heat generated by applying lubricating oil and passing it through a drawing die for wire drawing to reduce the diameter of the wire material. A method for manufacturing a conductive wire, characterized in that wire drawing is performed while the wire is being drawn. (5) The method for manufacturing a conductive wire according to claim 3 or 4, characterized in that a liquid polymer compound having a viscosity of 300 to 50,000 cSt (40°C) is used as the base oil. (6) Polybutene, polymethacrylate, polyisobutylene with a viscosity of 300 to 50,000 cSt (40°C),
98 to 75% by weight of one or more base oils selected from ethylene-α-olefin copolymers and polyalkylene glycols, and 2 to 25% of additives selected from animal and vegetable oils and aliphatic dicarboxylic acids having 5 to 36 carbon atoms. Claim 3 or 4, characterized in that a lubricating oil containing % by weight is used.
2. Method for manufacturing a conductive wire as described in Section 1. (7) The method for manufacturing a conductive wire according to any one of claims 3 to 6, wherein the nonferrous metal is copper or aluminum. (8) Lubricating the surface of a wire material made of non-ferrous metal or a wire material whose core wire is coated with non-ferrous metal, using a liquid polymer compound as a base oil and an additive selected from animal and vegetable oils and fats or aliphatic dicarboxylic acids. The wire is coated with oil and passed through a drawing die for wire drawing, and the wire is drawn while forming a lubricating film on the surface of the non-ferrous metal using the heat generated by reducing the diameter of the wire. Two or more wires are twisted together. A method for manufacturing a conductive wire, characterized by combining. (9) Lubricating the surface of a wire material made of non-ferrous metal or a wire material whose core wire is coated with non-ferrous metal, using a liquid polymer compound as a base oil and an additive selected from animal and vegetable oils and fats or aliphatic dicarboxylic acids. A reaction film of the non-ferrous metal and the lubricating oil additive is formed on the surface of the non-ferrous metal by the heat generated by applying oil and passing it through a drawing die for wire drawing to reduce the diameter of the wire material. A method for manufacturing a conductive wire, which comprises twisting together two or more wires that have been drawn together.