JP2009226419A - Method for producing copper or copper alloy wire rod and copper or copper alloy wire rod - Google Patents

Abstract

<P>PROBLEM TO BE SOLVED: To provide a method for producing an oxygen-free copper wire rod by which production cost is reduced, the oxidation of molten metal is prevented to obtain oxygen-free copper with an oxygen content of ≤10 ppm, and simultaneously, the generation of blow holes caused by the entanglement of bubbles upon pouring is reduced, thus surface defects upon rolling for wire drawing are reduced. <P>SOLUTION: A method for producing an oxygen-free copper or oxygen-free copper alloy wire rod is disclosed by which molten copper produced from a melting furnace is continuously introduced into a tundish through a gutter, the molten copper within the tundish is formed into an ingot by a belt and wheel type or twin belt type moving mold casting machine, and the ingot is continuously pulled out and is continuously rolled. The molten metal pouring part between a spout provided in the tundish and the casting machine is sealed with a seal gas containing a ≥90 vol.% hydrogen gas, and the concentration of oxygen is controlled to ≤10 ppm. <P>COPYRIGHT: (C)2010,JPO&INPIT

Description

  The present invention relates to a method for producing copper or a copper alloy wire, which is suitably used as a wire harness for automobiles, other signal wires or trolley wires, by continuously casting and rolling copper or a copper alloy using a moving mold. The present invention relates to a copper or copper alloy wire obtained by the method.

Since copper conductors used in generators such as motors and alternators are welded for the purpose of improving performance and reliability, oxygen-free copper that does not produce gas voids in the weld is used. In addition, as electronic devices become smaller, copper conductors are required to be thin, and oxygen-free copper having excellent ductility and workability has been used.
Examples of the method for producing oxygen-free copper include (1) dip forming method, (2) upcast method, and (3) horizontal continuous casting method. These production methods are all small-scale equipment, and it is easy to make the periphery of the molten copper into a non-oxidizing atmosphere, but there is a disadvantage that the cost is increased because of low productivity.

Therefore, a method for producing oxygen-free copper by a continuous casting and rolling method has been proposed (see, for example, Patent Document 1). Here, the molten copper pouring portion between the spout and the casting machine is covered with a reducing gas. Means are shown.
In addition, it is difficult to produce oxygen-free wire because it is difficult to produce oxygen-free wire by exposure to air while molten metal such as belt and wheel type with high production capacity reaches the rotary casting machine from the spout. It is disclosed that an outer cylinder is provided and a non-oxidizing gas is introduced into the pouring part to block ambient air, thereby producing an oxygen-free continuous bar (for example, see Patent Document 2).
Furthermore, a deoxidation tank is installed in the belt and wheel type continuous casting and rolling method, and the space inside the mold is made from the tip of the spout to the atmosphere of a flame of reducing gas such as butane gas and acetylene gas. A method for producing a copper wire and an oxygen-free copper alloy wire is known (see, for example, Patent Document 3).

JP 54-45628 A JP-A-10-249493 JP 2002-120050 A

  However, in the oxygen-free copper (alloy) wire rod by the continuous casting rolling method using the rotary moving mold described in Patent Document 1, when the molten copper is cooled and solidified to form an ingot, voids and cracks are formed in the ingot. There was a problem that the surface quality was deteriorated by generating and scratching the surface of the oxygen-free copper (alloy) wire during rolling. Further, Patent Document 2 does not show what kind of metal and non-oxidizing gas are, and aims to prevent oxidation due to air entrainment. Furthermore, paying attention to the hydrogen in the molten copper as a cause of voids and cracks generated in the ingot, a technique for performing a dehydrogenation process in the transfer process of the molten copper, and the hydrogen concentration of the oxygen-free copper wire to 1 ppm or less A technique for improving the surface quality of an oxygen-free copper wire is known. However, even if this technique is used, the generation of voids and cracks in the ingot is not completely eliminated, and the occurrence of scratches on the surface of the oxygen-free copper (alloy) wire during rolling is not suppressed so much. The surface quality of the oxygen-free copper wire remained poor.

  By the way, when continuously casting oxygen-free copper or oxygen-free copper alloy with an oxygen content of 10 ppm or less by the belt-and-wheel method or twin-belt method that is a moving mold casting method, when the molten copper flows from the spout into the mold, Internal voids may form. In order to investigate the cause, casting was performed using butane as a reducing gas as the atmospheric gas in this space. It is confirmed that a small amount of carbon is attached to the inner surface of the void of the ingot obtained under these conditions. This is because the gas on the upper surface of the molten metal is entrained and pyrolytically decomposed. To be judged.

  In each patent document, there is a description that voids are formed by hydrogen and trace oxygen in the molten copper, but in pouring with a high-speed flow from the spout into the moving mold, it is close to the molten copper surface in the mold. Was newly found to entrain the gas in the melt. Therefore, non-oxidizing and reducing gases such as argon, nitrogen, and butane that are usually used as gas seals do not dissolve in the molten copper, and the gas is present in the molten copper as bubbles, and at the solidification interface. It is captured and remains. As described above, particularly in the case of a hydrocarbon-based gas such as butane, the entrained gas is thermally decomposed in the ingot, resulting in a void with carbon attached thereto. The voids to which the carbon adheres are extremely difficult to be pressure-bonded in the rolling process subsequent to the casting process, and eventually lead to surface defects and blisters in the enamel coating process, for example.

  Accordingly, the present invention is directed to continuous casting and rolling in order to reduce manufacturing costs in a method of manufacturing copper or copper alloy (hereinafter, “copper or copper alloy” may be abbreviated as “copper (alloy)”). This method prevents oxidation of the molten metal in the process and makes oxygen-free copper (alloy) with an oxygen content of 10 ppm or less, and at the same time, reduces the generation of voids due to entrainment of bubbles during pouring, and thereby the surface during drawing rolling An object of the present invention is to provide a method for producing an oxygen-free copper (alloy) wire that reduces defects and an oxygen-free copper (alloy) wire obtained thereby.

  The inventors have elucidated the new mechanism of void formation, and as an improvement, hydrogen is a gas that dissolves in molten copper compared to the conventional seal gas even if bubble entrainment of the seal gas occurs during pouring. I found out. Therefore, if hydrogen is used as a sealing gas when pouring from the spout, even if it is entrained in the molten metal, small bubbles are dissolved in the molten copper. And it turned out that hydrogen gas is discharged | emitted at the time of solidification of a molten copper, and only the fine bubble defect called a pinhole which is crimped | bonded by the rolling process following a casting process and lose | disappears is produced. The present invention has been made based on such findings. It has also been found that when the amount of oxygen in the molten copper supplied from the spout exceeds 10 ppm, this oxygen and the entrained hydrogen form water vapor due to a chemical reaction to form a large blowhole. . For this purpose, the oxygen content in the molten copper or alloy molten copper supplied from the spout needs to be 10 ppm or less.

That is, the present invention
(1) Copper or copper alloy molten copper produced from a melting furnace is continuously guided into a tundish through a tub, and the molten copper in the tundish is cast by a belt and wheel type or twin belt type moving mold. A method of producing oxygen-free copper or oxygen-free copper alloy wire that is continuously drawn from the casting machine and continuously rolled as it is, and is attached to the tundish. The molten metal pouring portion between the spout and the casting machine is sealed with a sealing gas which is a non-oxidizing gas containing 90% by volume or more of hydrogen gas, and the remainder does not substantially contain carbon, and the oxygen concentration is 10 ppm or less. An oxygen-free copper or oxygen-free copper alloy wire manufacturing method, characterized in that the copper or copper alloy wire is
(2) The oxygen-free copper alloy according to (1), wherein raw copper is melted in a melting furnace, deoxidation / dehydrogenation treatment is performed, and then an alloying element component is added to form the copper alloy molten copper. Manufacturing method of wire,
(3) A method for producing an oxygen-free copper wire according to (1) or (2), wherein a phosphorus compound is added into the tundish, and the temperature of the molten copper is adjusted to 1085 to 1100 ° C.
(4) Precipitation strengthening type in which the copper alloy contains 1.0 to 5.0% by mass of Ni, 0.25 to 1.5% by mass of Si, and the balance is composed of Cu and inevitable impurity elements The method for producing a copper alloy wire according to any one of (1) to (3),
(5) The copper alloy contains 0.2 to 2.0% by mass of Cr, and 0.02 to 1 at least one element selected from the group consisting of Ag, Mg, Mn, Zn, Sn and Fe The method for producing a copper alloy wire according to any one of (1) to (3), characterized in that the copper alloy wire is contained in an amount of 0.0% by mass and the balance is composed of Cu and inevitable impurity elements, and
(6) Copper or copper alloy wire produced by the method according to any one of (1) to (5),
Is to provide.

According to the present invention, the hydrogen gas that is the sealing gas is a gas that can be dissolved in the molten copper, so even if it is caught in the molten metal when pouring the molten copper from the spout, it dissolves in the molten copper and has very small bubbles. Is only generated. The hydrogen gas is discharged when the molten copper is solidified, resulting in minute bubble defects called pinholes, but hydrogen is easy to diffuse into the solid due to its small atomic weight, and is rolled in a hot rolling process that is continuously applied after casting. As a result, the internal pressure of the pinhole is increased, so that hydrogen diffuses into the ingot, and finally the pinhole can be extinguished by pressure bonding.
By using a gas containing 90% by volume or more of hydrogen gas as a sealing gas around the spout and the pouring part and containing substantially no carbon, it is non-oxidizing and reducing, and at the same time prevents oxidation of the molten metal. As described above, the generation of voids due to entrainment of bubbles during pouring can be reduced. Thereby, the surface defect at the time of a drawing line can be reduced, the amount of peeling can be reduced, and the yield is improved. Moreover, the occurrence of hitting defects in the enamel application process can be reduced.
Therefore, a high-quality copper or copper alloy wire can be obtained, and can be manufactured in a large amount and at a low cost in a short time. As an example of the result, it is possible to supply a large amount of wire harnesses and trolley wires that are less expensive than conventional ones.

Next, a method for producing an oxygen-free copper (alloy) wire by continuous casting and rolling using the moving mold of the present invention will be described. In the manufacturing method of the present invention, a belt & wheel type or twin belt type moving mold casting machine is used.
About the manufacturing method of the copper alloy wire of this invention, with reference to drawings, the various examples of embodiment which concerns on this invention are demonstrated. In addition, in each figure, the same code | symbol is attached | subjected to the same element and the overlapping description is abbreviate | omitted.

FIG. 1 is an explanatory view showing an example of all steps of the manufacturing method according to the present invention. The method for producing an oxygen-free copper (alloy) wire according to the present invention, for example, as shown in FIG. 1, is obtained by melting molten copper in a reducing atmosphere using a shaft furnace 1 to obtain molten copper. The molten copper is continuously led into the tundish 3 through the trough 2. The molten copper in the tundish 3 is poured into a belt & wheel type movable mold casting machine 8 constituted by a belt 6 and a wheel 7 which are rotated by a turn roll, and cooled and solidified to form an ingot 9. The mass 9 is continuously withdrawn from the mold. In a state where the temperature of the solidified ingot 9 is not lowered as much as possible (preferably 900 ° C. or more), rolling is performed to a predetermined wire diameter with a continuous rolling mill 10 (two-way roll method, preferably three-way roll method), The drawn wire 11 is used. The rough drawn wire 11 is wound as it is, or further rolled by a wire drawing machine 12 shown in FIG. In FIG. 1, the installation of the wire drawing mill 12 is arbitrary.
The moving mold casting machine is not limited to the so-called belt & wheel type moving mold composed of the belt 6 and the wheel 7 shown in FIG. Expression transfer molds can be used.

The outline of another example of the equipment configuration up to the moving mold casting machine in the wire manufacturing method for continuous casting and rolling according to the present invention will be further described with reference to FIG.
The apparatus shown in FIG. 2 is a preferable embodiment for producing a copper alloy wire, and further includes a holding furnace 15, a deoxidation / dehydrogenation unit 16, induction heating from the shaft furnace 1 to the moving mold casting machine 8 in FIG. This is an example in which a furnace 17 and an addition device 18 are provided.
In the shaft furnace 1, the raw material copper is melted at 1090 to 1150 ° C., and the molten copper is discharged from the shaft furnace 1 through the trough 2 to the holding furnace 15, and then retained in the holding furnace 15 at 1100 to 1200 ° C. The molten copper inside is discharged to the deoxidation / dehydrogenation unit 16 and the induction heating furnace 17 through the trough 2. Thereafter, in the induction heating furnace 17, the alloy element component is added from the adding device 18, adjusted to have a predetermined alloy composition, and melted.

  When a molten metal is used among the above-mentioned copper alloys, for example, the Corson alloy molten metal contains Si having a high affinity with oxygen, so that the oxygen potential in the molten copper is in a very low state. Conversely, the hydrogen potential in copper is high. Therefore, in the case of such a copper alloy, it is preferable to dehydrogenate the molten copper in the induction heating furnace in advance. Further, oxides having poor wettability with the molten alloy are adsorbed and removed by bubbles bubbled from the porous plug 19. In order to prevent oxidation of an element having a high affinity with oxygen such as Si in the molten copper, the upper space of the basket 2 is preferably covered with an inert gas or a reducing gas. However, even if a small amount of oxide is involved in the ingot, there is a risk of causing defects such as surface defects and disconnection of the obtained wire product.

In the deoxidation treatment, for example, granular charcoal is placed in the deoxidation treatment section, covered with an inner lid, heated with a gas burner, and the inside of the deoxidation / dehydrogenation unit 16 and when the charcoal becomes red-hot, the molten copper is supplied from the holding furnace 15. Take out the hot water. While the molten copper passes through the deoxidation treatment section, oxygen in the molten copper reacts with the granular charcoal to form carbon dioxide gas, which floats in the molten copper and is released.
The dehydrogenation treatment can be performed by a degassing means for bringing the molten copper into contact with the non-oxidizing gas by passing it around the soot held in the non-oxidizing gas atmosphere. Alternatively, the dehydrogenation treatment may be performed by a method of blowing an inert gas or a reducing gas into the molten copper, a method of blowing the same gas using a rotor, a method of refluxing the molten copper in a vacuum, or the like. Dehydrogenation may be performed after the deoxidation treatment or simultaneously with the deoxidation treatment. In addition, it adjusts so that the oxygen concentration in the pure copper molten metal or alloy molten metal of the tundish 3 may be 10 ppm or less.
The molten copper from the induction heating furnace 17 is continuously transferred into the tundish 3 through the trough 2, and the molten metal 5 is sealed with gas to the belt & wheel type moving mold casting machine 8 to spout 4. Pour hot water and solidify. When sealing with a sealing gas containing 90% by volume or more of hydrogen gas with respect to molten copper containing oxygen exceeding 10 ppm, a large steam-induced blowhole is formed by a chemical reaction between the entrained hydrogen gas and oxygen in the molten copper. Is done.

In the method for producing an oxygen-free copper (alloy) wire of the present invention, for example, copper phosphide (hereinafter abbreviated as CuP) is added to the molten copper in the tundish 3, and the temperature of the molten copper in the tundish 3 is set. The temperature is adjusted to 1085 to 1100 ° C, more preferably 1085 to 1095 ° C. At this time, the added CuP is preferably in a granular form of about 2 mmφ so as to be easily dissolved and diffused in the molten copper.
The reason why the phosphorus compound is added to the molten copper in the tundish 3 is to deoxidize the molten copper, to dehydrogenate it, and to reduce voids in the ingot. This is because the phosphorus compound remains to improve the strength of the crystal grain boundaries and reduce cracks in the ingot. Furthermore, the temperature of the molten copper in the tundish 3 is adjusted to 1085 to 1100 ° C. because the dehydrogenation of the molten copper by the phosphorus compound and the strength improvement of the crystal grain boundary of the ingot are remarkably expressed, and the ingot This is because even when the phosphorus content is as low as 10 ppm or less, the generation of voids and cracks in the ingot is reduced, and the surface of the oxygen-free copper wire during rolling is less likely to be damaged.

The reason why the phosphorus content in the ingot is 1 to 10 ppm is that if the phosphorus content is less than 1 ppm, voids and cracks in the ingot obtained by cooling and solidifying molten copper cannot be reduced, and oxygen is not present during rolling. This is because scratches on the copper wire surface are likely to occur, and the surface quality deteriorates. This is because if the phosphorus content exceeds 10 ppm, the electrical conductivity of the oxygen-free copper wire obtained by further cold-working the oxygen-free copper wire becomes less than 98%.
The reason for setting the temperature of the molten copper in the tundish 3 to 1085 to 1100 ° C. is that the molten copper may be solidified if the temperature is lower than 1085 ° C. When the temperature exceeds 1100 ° C., the phosphorus compound causes Dehydrogenation of molten copper and improvement in strength of crystal grain boundaries of the ingot cannot be fully expressed, and the generation of voids and cracks in the ingot where the molten copper is cooled and solidified increases, and oxygen-free copper during rolling This is because scratches on the surface of the wire are likely to occur.

The method for producing an oxygen-free copper (alloy) wire of the present invention is a method in which a molten copper in a tundish is poured from a spout attached to a moving mold casting machine, and cooled and solidified to form an ingot. The belt & wheel type moving mold casting machine will be described with reference to FIG. 3, and the double belt type moving mold casting machine will be described with reference to FIG.
The belt & wheel type moving mold casting machine 8 shown in FIG. 3 is composed of a belt (not shown) and a wheel 7, and the cooled belt is pressed against the outer periphery of the wheel on which the mold is formed by a support roller. It is rotating. A twin-belt type moving mold casting machine 8 shown in FIG. 4 casts between two cooled rotating belts 6.
The molten metal 5 is injected into the moving mold casting machine from the spout 4 attached to the tundish. In the present invention, the molten metal pouring part A between the spout and the casting machine (the part surrounded by the dotted line in FIGS. 3 and 4). ) Seal gas by spraying with seal gas.
The seal gas to be used is a non-oxidizing gas containing 90% by volume or more of hydrogen and the balance substantially not containing carbon such as nitrogen and argon. The hydrogen concentration is preferably 95% by volume or more, more preferably 98%. It is a volume% gas.

The copper (alloy) wire manufacturing method of the present invention is applied to pure copper or a copper alloy, but as an example of the copper alloy, a precipitation strengthened copper alloy such as a Corson alloy is preferable.
Here, as a representative example of the present invention, a manufacturing method in which a Corson alloy (Cu—Ni—Si based copper alloy) is applied will be described below. However, in the case of a precipitation strengthening type copper alloy, the same method can be applied to other alloy systems. Can be manufactured.
For example, a Corson copper alloy generally contains 1.0 to 5.0 mass% Ni, 0.25 to 1.5 mass% Si, and the remainder contains Cu and inevitable impurity elements. It is.
The reason for prescribing the Ni content to 1.0 to 5.0% by mass is to improve the strength, and when the high temperature quenching is performed on the rough drawn wire immediately after continuous casting rolling (the state after the solution treatment (solution) This is to obtain a rough drawn line in a state close to that). If it is less than 1.0% by mass, sufficient strength cannot be obtained. If it exceeds 5.0% by mass, it becomes difficult to obtain a solution state or a state close to that even if high-temperature quenching is performed immediately after continuous casting rolling. The content of Ni is preferably 1.5 to 4.5% by mass, more preferably 1.8 to 4.2% by mass.
Moreover, the reason for prescribing Si to 0.25 to 1.5% by mass is to improve the strength by forming a compound with Ni, and similarly to Ni, high-temperature quenching is performed on the rough drawn wire immediately after continuous casting and rolling. This is because a rough drawn line in a solution state or a state close thereto can be obtained when it is performed. If it is less than 0.25% by mass, sufficient strength cannot be obtained, and if it exceeds 1.5% by mass, it becomes difficult to obtain a solution state or a state close thereto even if high-temperature quenching is performed immediately after continuous casting rolling. The content of Si is preferably 0.35 to 1.25% by mass, and more preferably 0.5 to 1.0% by mass.

Further, the copper alloy may contain 0.1 to 1.0% by mass of at least one element selected from the group consisting of Ag, Mg, Mn, Zn, Sn, P, and Fe. It is because the strength is excellent when these metal elements are contained in an amount of 0.1 to 1.0% by mass. If the amount is less than 0.1% by mass, the effect is not sufficiently exhibited. If the amount exceeds 1.0% by mass, it is difficult to obtain a solution state or a state close to that when high-temperature quenching is performed on the rough drawn wire immediately after continuous casting rolling. It becomes. The content of these elements is preferably 0.11 to 0.8% by mass, more preferably 0.12 to 0.6% by mass.
Furthermore, in the copper alloy, a part of the Ni content or in some cases the whole may be replaced with Co. In this case, Ni and Co are contained in a total amount of 1.0 to 5.0 mass% (preferably 1.5 to 4.5 mass%). Co exhibits the same effect as Ni in terms of forming a compound with Si, and contributes to strength improvement.

  Moreover, as an example of the copper alloy to which the method for producing a copper alloy wire according to the present invention is applied, in addition to the above-mentioned Corson alloy, 0.2 to 2.0% by mass of Cr (preferably 0.3 to 1.5%). A copper alloy composed of Cu and unavoidable impurity elements, and 0.2 to 2.0 mass% (preferably 0.3 to 1.5 mass%) of Cr, Containing 0.02 to 1.0% by mass (preferably 0.05 to 0.8% by mass) of at least one element selected from the group consisting of Ag, Mg, Mn, Zn, Sn and Fe, and the balance Copper alloy composed of Cu and inevitable impurity elements.

  The rough drawn wire obtained from the continuous rolling mill is quenched by a cooling device located at a high temperature of 600 ° C. or higher, preferably 650 ° C. or higher. According to the manufacturing method of the present invention, it is possible to manufacture a roughly drawn wire in a solution state, and a solution treatment (for example, a heat treatment step such as holding at 900 ° C. for 30 minutes) that is essential in the conventional manufacturing method. It can be omitted, and sufficient intermetallic compound can be deposited in the aging process.

  According to the continuous casting and rolling using the moving mold casting machine of the present invention, the oxygen-free copper wire is obtained at a low cost, with a good surface quality, and by further cold working the oxygen-free copper (alloy) wire. Can produce an oxygen-free copper (alloy) wire having a high conductivity of 98% or more.

Next, the present invention will be described in more detail based on examples, but the present invention is not limited thereto.
In general, copper or copper alloy wire having an oxygen concentration of 10 ppm or less is said to have sufficient properties as a wire if the average number of surface defects is 2 / 10,000 m (φ2.6 mm line) or less. Yes. This example demonstrates that the wire obtained in the present invention has this property.

(Example)
By the continuous casting and rolling method using the rotary moving mold (belt and wheel type) shown in FIG. 1, electrolytic copper metal is melted in a CO atmosphere in a shaft furnace 1, and the obtained molten copper is tundished through a trough 2. 3 led continuously. When the molten copper is a copper alloy, as shown in FIG. 2, the alloy components are added from the adding device 18 and mixed and melted in an induction heating furnace, and the molten copper (alloy) temperature in the tundish is in the range of 1085 to 1150 ° C. did. Molten copper (alloy) in the tundish 3 was poured from a spout 4 attached to the tundish 3 into a rotary moving casting machine composed of a belt 6 and a wheel 7. At that time, hydrogen gas, mixed gas, and inert gas shown in Table 1 were sprayed at 10 L / min as a seal gas to the pouring part around the spout. The hydrogen gas used in Examples Nos. 2 to 4 has a purity of 99.99% or more.
The ingot 9 is cooled and solidified to form an ingot 9, which is continuously drawn out from the mold and continuously rolled by the continuous rolling machine 10 as it is, and a copper rough wire or copper alloy rough wire (φ8 mm) 11 having an oxygen concentration of 10 ppm or less. Was produced at 20 tons / hour. The surface of this rough drawing wire was peeled off by 100 μm, and then drawn to φ2.6 mm with a wire drawing machine 12 to obtain an oxygen-free copper wire 13. This wire 13 was wound around a pallet 14.

An eddy current testing machine (eddy current testing machine, manufactured by Nihon Felster Co., Ltd.) was installed on the die exit side when drawing φ2.6 mm, and surface defects were measured. Table 1 below shows the results of examining the number (average per 10000 m) of the eddy current flaw testing machine, in which the signal level exceeding the allowable value was judged as a harmful defect. The oxygen content of the wire drawing (or rough drawing wire) was also measured with an oxygen analyzer (manufactured by LECO Japan Co., Ltd.), and the results are summarized in Table 1.
In Table 1, OFC is pure copper having an oxygen concentration of 10 ppm or less (oxygen-free copper: equivalent to JIS C1020), and TPC is pure copper having an oxygen concentration exceeding 10 ppm (tough pitch copper: equivalent to JIS C1100).

  As is apparent from Table 1 above, when a non-oxidizing gas containing 90% by volume or more of hydrogen gas as a sealing gas and the balance containing substantially no carbon is used, a conventional inert gas or reducing gas is used. Compared with the one used, the surface defects of the obtained wire were greatly reduced, and it became clear that the wire was of good quality.

It is a schematic explanatory drawing which shows an example of all the processes of the manufacturing method which concerns on this invention. It is a schematic explanatory drawing of the other example which shows the process to the belt & wheel type moving mold casting machine of the manufacturing method of this invention. It is the cross-sectional schematic explaining the molten metal pouring part to the belt & wheel type moving mold casting machine used by this invention. It is the cross-sectional schematic explaining the molten metal pouring part to the twin belt type moving mold casting machine used by this invention.

Explanation of symbols

1 Shaft furnace 2 樋
DESCRIPTION OF SYMBOLS 3 Tundish 4 Spout 5 Molten metal 6 Belt 7 Wheel 8 Moving mold casting machine 9 Ingot 10 Continuous rolling mill 11 Rough drawing wire 12 Wire drawing mill 13 Wire drawing material 14 Pallet 15 Holding furnace
16 Deoxidation / dehydrogenation unit High-concentration molten copper production furnace 17 Induction heating furnace 18 Addition device 19 Porous plug 20 Ceramics filter A Molten metal pouring part

Claims (6)

  The copper or copper alloy molten copper produced from the melting furnace is continuously guided into the tundish through the trough, and the molten copper in the tundish is injected into a belt & wheel type or twin belt type mobile mold casting machine. A method of producing an oxygen-free copper or oxygen-free copper alloy wire rod that is cooled and solidified into an ingot, continuously drawn from the casting machine and continuously rolled as it is, and a spout attached to the tundish; Copper with an oxygen concentration of 10 ppm or less, where the molten metal pouring part between the casting machines is sealed with a sealing gas which is a non-oxidizing gas containing 90% by volume or more of hydrogen gas, and the remainder does not substantially contain carbon. Alternatively, a method for producing oxygen-free copper or oxygen-free copper alloy wire characterized by using a copper alloy wire.   2. The production of an oxygen-free copper alloy wire according to claim 1, wherein raw material copper is melted in a melting furnace, deoxidation / dehydrogenation treatment is performed, and then an alloy element component is added to form the copper alloy molten copper. Method.   3. The method for producing an oxygen-free copper wire according to claim 1, wherein a phosphorus compound is added to the tundish, and the temperature of the molten copper is adjusted to 1085 to 1100 ° C. 3.   The copper alloy contains 1.0 to 5.0% by mass of Ni, 0.25 to 1.5% by mass of Si, and the balance is a precipitation strengthening type composed of Cu and inevitable impurity elements. The method for producing a copper alloy wire according to any one of claims 1 to 3, wherein:   The copper alloy contains 0.2 to 2.0 mass% of Cr, and 0.02 to 1.0 mass of at least one element selected from the group consisting of Ag, Mg, Mn, Zn, Sn and Fe The method for producing a copper alloy wire according to any one of claims 1 to 3, wherein the copper alloy wire is contained in a remaining part of Cu and inevitable impurity elements.   The copper or copper alloy wire manufactured by the method according to any one of claims 1 to 5.

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