JP5613907B2 - Method for producing active element-containing copper alloy wire - Google Patents

Description

The present invention relates to a method for producing a high-strength copper alloy wire made of a copper alloy containing Cr, Zr, Si and the like and used for a trolley wire for trains.
This application claims priority on January 26, 2010 based on Japanese Patent Application No. 2010-14397 for which it applied to Japan, and uses the content for it here.

Conventionally, copper wires such as pure copper and Sn-containing copper alloys have been widely used as materials for train trolley wires and the like. These copper wires are manufactured using, for example, a continuous casting machine shown in Patent Document 1 and Patent Document 2. In the continuous casting machine shown in Patent Document 1 and Patent Document 2, a mold is directly connected to a casting furnace, and an ingot obtained by solidification in the mold is horizontally, vertically upward or vertically downward. It is designed to be pulled out toward.
Such a continuous casting machine is particularly suitable for producing a wire since an ingot having a relatively small diameter can be produced continuously.

In recent years, as a trolley wire for high-speed railways such as a Shinkansen, a wire made of a copper alloy having higher strength and better electrical conductivity than before has been demanded.
Here, as a copper alloy having high strength and good electrical conductivity, for example, a copper alloy containing Cr, Zr, Si or the like can be cited. In a copper alloy containing these elements, by performing an appropriate heat treatment, the precipitate particles are dispersed in the copper matrix phase, thereby improving the strength and ensuring electrical conductivity.

Such copper alloy wires containing Cr, Zr, Si, etc. are conventionally manufactured by producing an ingot having a large cross-sectional area called a cake or billet and hot working or cold working the ingot. It had been.
However, when producing an ingot with a large cross-sectional area and then producing a wire by hot working or cold working, the length of the obtained wire is limited by the size of the ingot. The wire rod could not be obtained. There was also a problem that production efficiency was poor.

Therefore, Patent Document 3 discloses a technical idea of continuously producing a small-diameter wire by drawing a copper alloy wire containing Cr, Zr, etc. in the horizontal direction, the vertical direction upward or the vertical direction downward. ing. That is, it has been proposed to cast a copper alloy wire containing Cr, Zr or the like with a continuous casting machine as shown in Patent Documents 1 and 2.
Patent Document 4 discloses a technique for producing a copper alloy wire containing Cr and Zr by a horizontal continuous casting machine using a heating mold.

However, in the continuous casting machines shown in Patent Document 1 and Patent Document 2, the mold is usually made of graphite having excellent solid lubricity, and the mold made of graphite is in direct contact with the molten metal in the casting furnace. It has become.
Here, elements such as Cr, Zr, and Si are active elements having high reactivity with graphite. For this reason, the mold reacts with elements (active elements) such as Cr, Zr and Si in the molten copper to generate carbides, and the cast ingot and the mold adhere to each other, or the mold is quickly worn out. As a result, casting could not be performed stably for a long time.

  Moreover, in the horizontal type continuous casting machine described in Patent Documents 1 and 2, the ingot is drawn out in a substantially horizontal direction, so that it is affected by gravity during solidification in the mold. In addition, a gap called an air gap is generated between the mold and the ingot due to solidification shrinkage, but in the horizontal continuous casting machine, the air gap amount is different between the upper side and the lower side of the ingot. For this reason, the cooling rate is different between the upper side and the lower side of the ingot, and there is a concern that the quality of the ingot made of a copper alloy containing Cr, Zr, Si or the like may not be stable. In addition, as mentioned above, the ingot and the mold are fixed and the mold is prematurely worn, which may deteriorate the surface quality of the ingot and make it difficult to pull out the mold, thereby stabilizing the casting. Could not be done.

  Patent Document 3 discloses the idea of continuously producing small-diameter wire rods by drawing a copper alloy wire rod containing Cr, Zr, etc. in the horizontal direction, the vertical direction upward or the vertical direction downward. However, as described above, the conventional continuous casting method cannot continuously produce a copper alloy wire containing Cr, Zr, Si, or the like.

  Further, in Patent Document 4, the reaction between graphite and an active element such as Cr or Zr is suppressed by using a heating mold, and a copper alloy wire containing Cr, Zr or the like is continuously produced by a horizontal continuous casting machine. Is disclosed. However, since the graphite mold itself comes into contact with the high-temperature molten copper, oxidation wear becomes severe. In addition, when a heating mold is used, there is a problem that it is difficult to increase the drawing speed of the ingot, so that the production efficiency cannot be improved. Furthermore, in this patent document 4, since the ingot was pulled out in a substantially horizontal direction, it was still affected by gravity, and there was a problem that the quality was not stable.

Japanese Patent Laid-Open No. 06-226406 JP-A 61-209757 JP 2006-138015 A Japanese Patent Publication No. 08-000956

  This invention is made | formed in view of the situation mentioned above, Comprising: The copper alloy wire which consists of copper alloys containing active metals, such as Cr, Zr, Si, can produce efficiently and stably. It aims at providing the manufacturing method of a possible active element containing copper alloy wire.

In order to solve such a problem and achieve the above object, one embodiment of the present invention has the following requirements.
The manufacturing method of the active element containing copper alloy wire which concerns on 1 aspect of this invention melt | dissolves a copper raw material, produces | generates molten copper , and any one of Cr, Zr, Si in the said molten copper Or the active element addition process which adds 2 or more types of active elements, the holding process which hold | maintains the said molten copper in a casting furnace, and the casting process which produces an ingot continuously by the casting_mold | template connected to the said casting furnace And the mold includes a graphite sleeve, and heat insulation is performed on the lower side in the vertical direction of the casting furnace so that the hydraulic head pressure of the molten copper stored in the casting furnace acts on the mold. In the casting process, pressure is applied toward the mold to supply the molten copper into the mold, and the molten copper is cooled and solidified in the mold.
The active element-containing copper alloy wire is made of a copper alloy containing an active element.
In the method for producing an active element-containing copper alloy wire according to one aspect of the present invention, the temperature of the mold may be maintained at 450 ° C. or lower.
The temperature of the molten copper in the heat insulating member portion may be set to be higher than the melting point of the molten copper.
In the casting step, a molten steel head in the casting furnace from the upper end of the mold may be 100 mm or more.
The cross-sectional area ratio Sf / Sc between the horizontal cross-sectional area Sc of the mold and the horizontal cross-sectional area Sf of the casting furnace may be 5 or more.
A continuous melting furnace and a holding furnace may be provided in the preceding stage of the casting furnace, and the molten copper generated in the molten copper generation step may be continuously supplied into the casting furnace.

  In the method for producing an active element-containing copper alloy wire according to one aspect of the present invention, since the heat insulating member is disposed between the mold and the casting furnace, the mold has a temperature equivalent to the molten copper inside the casting furnace. It is prevented from being heated up to. For this reason, reaction with an active element, such as a casting_mold | template and Cr, Zr, Si, can be suppressed. Even if the temperature of the mold is kept low, the temperature of the molten copper in the vicinity of the mold in the casting furnace is maintained high, and casting can be performed stably.

  Further, in the casting process, the molten copper is supplied into the mold by applying pressure toward the mold, and the molten copper is cooled and solidified in the mold. For this reason, as described above, even if a heat insulating member is interposed between the casting furnace and the mold, molten copper can be reliably supplied from the casting furnace to the mold, and stable casting can be performed. In addition, since the mold is disposed on the lower side in the vertical direction of the casting furnace, the pressure can be reliably applied to the mold using the water head pressure of the molten copper held in the casting furnace.

Here, it is preferable that the temperature of the mold, that is, the temperature of the highest part of the mold is maintained at 450 ° C. or lower.
In this case, by cooling the mold and maintaining the temperature of the highest part of the mold at 450 ° C. or less, early wear of the mold can be suppressed and reaction with active elements such as Cr, Zr, Si, etc. Can be suppressed. In particular, when a part of the mold is made of graphite, the oxidative wear of the mold can be reliably suppressed. In addition, since the mold and the casting furnace are connected via a heat insulating member, even if the mold is held at 450 ° C. or lower, the temperature drop of the molten copper in the casting furnace can be prevented, and casting can be performed stably. It becomes possible.

It is preferable that the temperature of the molten copper in the heat insulating member is set to be higher than the melting point of the molten copper.
In this case, the fluidity of the molten copper in the heat insulating member is maintained, and the molten copper can be reliably supplied into the mold by the water head pressure of the molten copper in the casting furnace. In addition, since the mold and the casting furnace are connected via the heat insulating member, even if the temperature of the molten copper passing through the heat insulating member is set to be higher than the melting point of the molten copper, the mold is kept at a high temperature. There is no exposure. For this reason, the early wear of a casting_mold | template and reaction with an active element can be suppressed.

In the casting step, it is preferable that the molten copper in the casting furnace from the upper end of the mold has a head of 100 mm or more.
In this case, molten copper can be reliably supplied into the mold, and casting can be performed stably. Moreover, generation | occurrence | production of a micro void | hole can be suppressed and a high quality ingot can be produced.

The cross-sectional area ratio Sf / Sc between the horizontal cross-sectional area Sc of the mold and the horizontal cross-sectional area Sf of the casting furnace is preferably 5 or more.
In this case, the fluctuation of the molten metal surface in the casting furnace when the ingot is pulled out from the mold can be suppressed to a small level. Accordingly, the water head pressure of the molten copper is stabilized, and a high-quality ingot can be produced.

It is preferable that a continuous melting furnace and a holding furnace are provided in the front stage of the casting furnace, and the molten copper produced in the molten copper production process is continuously supplied into the casting furnace.
In this case, since the molten copper is continuously supplied into the casting furnace, a long ingot can be produced. Moreover, the ingot used as the raw material of a wire can be manufactured efficiently.

  According to one aspect of the present invention, a copper alloy wire made of a copper alloy containing an active metal such as Cr, Zr, or Si can be produced efficiently and stably.

It is a schematic explanatory drawing of an example of the continuous casting apparatus used in embodiment of the manufacturing method of the active element containing copper alloy wire which concerns on 1 aspect of this invention. It is explanatory drawing of the casting furnace with which the continuous casting apparatus shown in FIG. 1 was equipped. It is expansion explanatory drawing of the connection part of a casting furnace and a casting_mold | template. It is a flowchart of embodiment of the manufacturing method of the active element containing copper alloy wire which concerns on 1 aspect of this invention. It is a figure which shows another example of the continuous casting apparatus used in embodiment of the manufacturing method of the active element containing copper alloy wire which concerns on 1 aspect of this invention.

Hereinafter, an embodiment of a method for producing an active element-containing copper alloy wire according to an aspect of the present invention will be described with reference to the accompanying drawings.
The active element-containing copper alloy wire manufactured in the manufacturing method of this embodiment includes Cr, Zr, Si, and the like, which are active elements having high reactivity with graphite (graphite) constituting the graphite sleeve 31 described later. In addition, an element with high reactivity with graphite (graphite) is an element that has a lower free energy of standard carbide generation and is more stable when generating carbide than a single element.

In this embodiment, the active element-containing copper alloy wire is Cr: 0.25 mass% to 0.45 mass%, Zr: 0.05 mass% to 0.15 mass%, Si: 0.01 mass% It is made of a Cu—Cr—Zr—Si alloy containing 0.05% by mass or less and containing Cu and inevitable impurities as the balance.
Moreover, the wire diameter (diameter) of an active element containing copper alloy wire is 10 mm or more and 40 mm or less, and is 30 mm in this embodiment.

Next, the continuous casting apparatus used with the manufacturing method of the active element containing copper alloy wire of this embodiment is demonstrated. FIG. 1 shows a continuous casting apparatus 10 that produces an ingot W that is a material of an active element-containing copper alloy wire.
The continuous casting apparatus 10 includes a melting furnace 11, a holding furnace 13, a transfer rod 15, a casting furnace 20, a mold 30, and a pinch roll 17 that draws the produced ingot W.

The melting furnace 11 is a furnace that heats and melts a copper raw material to produce molten copper, and includes a raw material inlet 11A through which the copper raw material is introduced and a molten copper outlet 11B through which the produced molten copper is discharged. ing.
In addition, a holding furnace 13 is disposed on the rear side of the melting furnace 11, and the melting furnace 11 and the holding furnace 13 are connected by a connecting rod 12.

  The holding furnace 13 is a furnace that temporarily holds the molten copper supplied from the melting furnace 11 to keep it warm. The holding furnace 13 is provided with an adding means (adding device) (not shown) for adding an active element such as Cr, Zr, or Si. Further, the inside of the holding furnace 13 is an inert gas atmosphere in order to prevent oxidation of the active element.

  The transfer rod 15 is for transferring the molten copper, which is prepared by adding an active element such as Cr, Zr, or Si, to the casting furnace 20 at the subsequent stage. In the present embodiment, the inside of the transfer rod 15 is an inert atmosphere.

The casting furnace 20 is a furnace for storing the molten copper transferred from the holding furnace 13. As shown in FIG. 2, the casting furnace 20 includes a chamber 21, a furnace body 23, and a heating means (heating device) 24. The inside of the chamber 21 is an inert gas atmosphere. Moreover, the heating means 24 is provided in order to adjust the temperature of the stored molten copper, and the radiation heater is provided in this embodiment. Further, a pouring hole 26 is formed in the bottom surface portion of the furnace body 23 and the chamber 21.
Of the casting furnace 20, the cross-sectional area Sf of a cross section along the horizontal direction of the interior of the furnace body 23 which molten copper is stored is set in the range of 20000mm ² ≦ Sf ≦ 34600mm ^2. Further, the casting furnace 20 is provided with a level sensor (not shown) for detecting the position of the molten copper surface stored in the furnace body 23.

As shown in FIG. 3, the mold 30 has a cylindrical shape including a casting hole 36 penetrating in the axial direction. The mold 30 includes a graphite sleeve 31 provided on the inner peripheral surface of the casting hole 36 and a cooling jacket 32 positioned on the outer peripheral side of the graphite sleeve 31. Inside the cooling jacket 32, a water channel 33 for circulating cooling water is provided to cool the graphite sleeve 31.
The mold 30 is connected to the lower side in the vertical direction of the casting furnace 20, and is arranged so that the pouring hole 26 of the casting furnace 20 and the casting hole 36 of the mold 30 communicate with each other as shown in FIGS. It is installed. The diameter of the casting hole 36 of the mold 30 is set to 50 mm or less, preferably 10 mm to 40 mm. In the present embodiment, the diameter of the casting hole 36 is set to 30 mm.

  The cross-sectional area ratio Sf / Sc between the horizontal cross-sectional area Sc of the mold 30 and the horizontal cross-sectional area Sf of the casting furnace 20 is set to 5 or more (Sf / Sc ≧ 5). The cross-sectional area ratio Sf / Sc is preferably 10 or more (Sf / Sc ≧ 10).

A heat insulating member 40 is disposed between the graphite sleeve 31 of the mold 30 and the furnace main body 23 of the casting furnace 20. In this embodiment, the heat insulating member 40 is connected to the outside of the bottom surface of the chamber 21 and the furnace. It is arranged between the bottom surface outside of the main body 23. The heat insulating member 40 has a cylindrical shape having a through hole 46, and the inner peripheral surface of the through hole 46 is continuous with the inner peripheral surface of the casting hole 36 of the mold 30 and the pouring hole 26 of the casting furnace 20. Are arranged.
The heat insulating member 40 is made of ceramics such as Al ₂ O ₃ and SiO ₂ , and has a thermal conductivity of 40 W / (m · K) or less at room temperature and a thickness of 5 mm to 60 mm. .

Next, the manufacturing method of the active element containing copper alloy wire of this embodiment using the continuous casting apparatus 10 mentioned above is demonstrated.
As shown in FIG. 4, the manufacturing method of the active element-containing copper alloy wire includes a molten copper production step S01 in which a copper raw material is dissolved to produce molten copper, and an activity in which an active element is added to the obtained molten copper. The element addition step S02, the molten copper transfer step S03 for transferring the molten copper from the holding furnace 13 to the casting furnace 20, the holding step S04 for holding the molten copper added with the active element in the casting furnace 20, and the casting A casting step S05 in which the ingot W is continuously produced by the mold 30 connected to the furnace 20.

(Molten copper production step S01)
First, a pure copper (4NCu) cathode having a purity of 99.99 mass% or more and less than 99.999 mass% is prepared as a copper raw material. This 4NCu cathode is charged into the melting furnace 11 from the raw material charging port 11A, and heated and melted in the melting furnace 11 to produce molten copper. And the obtained molten copper is supplied to the holding furnace 13 through the connecting rod 12 from the molten copper discharge port 11B.

(Active element addition step S02)
In the holding furnace 13, the supplied molten copper is temporarily held, and the temperature of the molten copper is controlled to, for example, 1100 to 1400 ° C. by a heating means (heating device) (not shown) such as a heater or an induction heating coil. And active elements, such as Cr, Zr, Si, are added to the molten copper in the holding furnace 13, and the component of molten copper is adjusted. At this time, the inside of the holding furnace 13 is an inert gas atmosphere, and oxidation of active elements such as Cr, Zr, and Si is suppressed.

(Molten copper transfer step S03)
The molten copper to which an active element such as Cr, Zr, or Si is added in the holding furnace 13 is supplied to the casting furnace 20 through the transfer rod 15. As described above, the inside of the transfer rod 15 is an inert gas atmosphere, and oxidation of molten copper and active elements is prevented.

(Holding step S04)
In this casting furnace 20, while holding the molten copper to which an active element such as Cr, Zr, or Si is added, the temperature of the molten copper is set to, for example, 1100 to 1400 ° C. by a heating means (heating device) 24 such as a radiation heater. To control. In addition, the molten metal surface position stored in the furnace body 23 of the casting furnace 20 is detected by a level sensor, and the molten copper is transferred from the holding furnace 13 so that the molten metal surface position is constant. The amount is adjusted.

(Casting process S05)
Then, the molten copper stored in the casting furnace 20 is supplied into the casting hole 36 of the mold 30 through the pouring hole 26. The molten copper supplied into the mold 30 is solidified at the graphite sleeve 31 portion cooled by the cooling jacket 32, and the ingot W is produced from the lower end side of the casting hole 36. Note that the drawing speed of the ingot W is controlled by the pinch roll 17, and in this embodiment, the ingot W is drawn out intermittently.

  The drawing speed of the ingot W in the casting process 05 is adjusted to 200 mm / min or more and 600 mm / min or less. Moreover, the supply speed of the molten copper to the casting furnace 20 is adjusted to 0.5 t / hour or more and 10 t / hour or less.

Moreover, in this casting process S05, it is comprised so that the hydraulic head pressure of the molten copper stored in the furnace main body 23 of the casting furnace 20 may act in the casting_mold | template 30, and in this embodiment, the upper end of the casting_mold | template 30 is comprised. The height of the molten copper in the furnace body 23 is controlled so that the head of the molten copper in the furnace body 23 from 30a becomes 100 mm or more.
Further, in this casting step S05, the temperature of the upper end portion 31a of the graphite sleeve 31 of the mold 30 is set to 450 ° C. or less, and the molten copper temperature of the heat insulating member 40 portion is higher than the melting point of the molten copper. Is set.

The ingot W obtained in this way is cooled by a cooling means (not shown) and wound into a coil. In the present embodiment, the ingot W is subjected to a solution treatment by cooling a long ingot W of, for example, 950 ° C. or higher to a room temperature at a cooling rate of 50 ° C./min or higher by the cooling means. .
Then, by subjecting the ingot W cooled to room temperature to heat treatment, cold working, or the like, an active element-containing copper alloy wire having predetermined characteristics is produced.

  According to the method for producing an active element-containing copper alloy wire of this embodiment having such steps, the heat insulating member 40 is disposed between the graphite sleeve 31 of the mold 30 and the furnace body 23 of the casting furnace 20. Therefore, the molten copper in the furnace body 23 is prevented from coming into direct contact with the graphite sleeve 31 of the mold 30. For this reason, the reaction between the graphite sleeve 31 and an active element such as Cr, Zr, or Si can be suppressed. Thereby, adhesion with the graphite sleeve 31 and the ingot W can be prevented, and deterioration of the graphite sleeve 31 can be prevented. Further, oxidation wear of the graphite sleeve 31 is suppressed, and casting can be performed stably for a long period of time.

  And since the casting_mold | template 30 is arrange | positioned by the vertical direction lower side of the casting furnace 20, in the casting process S05, making the inside pressure 30 of the molten copper hold | maintained in the furnace main body 23 of the casting furnace 20 act in the casting_mold | template 30 The molten copper can be cooled and solidified in the mold 30, and even when the heat insulating member 40 is interposed, the molten copper can be reliably supplied into the casting hole 36 of the mold 30, and stable casting can be performed. it can. In particular, in the present embodiment, in the casting step S05, since the water head of the molten copper in the furnace body 23 from the upper end of the mold 30 is set to 100 mm or more, the molten copper is reliably supplied toward the mold 30. And casting can be performed stably. Moreover, generation | occurrence | production of a micro void | hole can be suppressed and high quality ingot W can be produced.

  Further, since the temperature of the upper end portion 31a of the graphite sleeve 31 of the mold 30 is maintained at 450 ° C. or less, early wear of the graphite sleeve 31 can be suppressed, and reaction with active elements such as Cr, Zr, and Si can be suppressed. it can. In addition, since the graphite sleeve 31 of the mold 30 and the furnace body 23 of the casting furnace 20 are connected via the heat insulating member 40, even if the mold 30 is cooled so that the temperature of the mold 30 is 450 ° C. or less, The temperature drop of the molten copper in the casting furnace 20 can be prevented.

Furthermore, since the molten copper temperature in the heat insulating member 40 is set to be higher than the melting point of the molten copper, the fluidity of the molten copper in the heat insulating member 40 is maintained, and the molten copper head in the casting furnace 20 is maintained. The molten copper can be reliably supplied into the mold 30 by the pressure. In addition, since the mold 30 and the casting furnace 20 are connected via the heat insulating member 40, the mold 30 remains hot even if the molten copper temperature of the heat insulating member 40 is set to be higher than the melting point of the molten copper. It is possible to suppress the early wear of the mold 30 and the reaction with the active element.
In particular, in the present embodiment, the heat conductivity of the heat insulating member 40 is set to 40 W / (m · K) or less at normal temperature, and the thickness of the heat insulating member 40 is set to 5 mm or more and 60 mm or less. Heat transfer between the graphite sleeve 31 and the furnace body 23 of the casting furnace 20 can be reliably suppressed.

  The sectional area ratio Sf / Sc between the horizontal sectional area Sc of the casting hole 36 of the mold 30 and the horizontal sectional area Sf of the casting furnace 20 satisfies Sf / Sc ≧ 5, preferably Sf / Sc ≧ 10. Is set to For this reason, in casting process S05, the molten metal surface fluctuation | variation of the molten copper in the furnace main body 23 can be suppressed small, and the water head pressure of molten copper will be stabilized. Therefore, a high quality ingot W can be produced.

Further, a melting furnace 11, a holding furnace 13, and a connecting rod 12 are provided in the previous stage of the casting furnace 20, and the molten copper produced in the molten copper production step S 01 is continuously supplied into the casting furnace 20. . For this reason, the ingot W can be manufactured efficiently.
Moreover, in this embodiment, since the inside of the melting furnace 11, the holding furnace 13, the transfer rod 15, and the casting furnace 20 is made into inert gas atmosphere, oxidation of active elements, such as molten copper and Cr, Zr, Si, can be prevented. High quality ingots W can be produced.

As mentioned above, although embodiment of this invention was described, this invention is not limited to this, It can change suitably in the range which does not deviate from the technical idea of the invention.
For example, in this embodiment, although the case where the obtained ingot W was rapidly cooled and solution treatment was performed was demonstrated, it is not limited to this. For example, the ingot W may be cooled, and then the solution treatment may be performed, or the solution treatment itself may not be performed.

  Moreover, although demonstrated using the continuous casting apparatus 10 provided with the melting furnace 11, the holding furnace 13, and the connecting rod 12, it is not limited to this. For example, as shown in FIG. 5, molten copper may be generated by a batch-type melting furnace 111 and supplied to the casting furnace 20 via a transfer rod 15. In this case, component adjustment can be performed in the batch melting furnace 111. That is, the molten copper production step S01 and the active element addition step S02 can be performed simultaneously. Further, a long ingot W can be produced by connecting a plurality of batch melting furnaces 111 to the casting furnace 20 and alternately supplying molten copper from the batch melting furnace 111 to the casting furnace 20.

In the present embodiment, Cr: 0.25% by mass to 0.45% by mass, Zr: 0.05% by mass to 0.15% by mass, Si: 0.01% by mass to 0.05% by mass Although the case of producing a copper alloy wire of a Cu—Cr—Zr—Si alloy containing Cu and the inevitable impurities as a balance has been described, it is not limited to this. For example, the copper alloy wire may contain one or more active elements of Cr, Zr, and Si, or may contain other elements.
Although the case where the diameter of the casting hole 36 of the mold 30 is 50 mm or less, preferably 10 mm or more and 40 mm or less has been described, the present invention is not limited to this.

Moreover, the drawing speed of the ingot W in the casting process and the supply speed of the molten copper to the casting furnace 20 are not limited to this embodiment.
Although the case where only one pouring hole 26 and only one casting hole 36 are provided has been described with reference to the drawings, the present invention is not limited to this. For example, a plurality of pouring holes 26 and casting holes 36 may be provided, and a plurality of ingots W may be produced simultaneously.
Although the case where the ingot W is pulled out intermittently has been described, the present invention is not limited to this. For example, the ingot W may be pulled out continuously.

Moreover, although the case where the inside of the melting furnace 11, the holding furnace 13, the transfer rod 15, and the casting furnace 20 was made into inert gas atmosphere was demonstrated, it is not limited to this. For example, oxidation of molten copper or active metal may be prevented in a vacuum (reduced pressure) state.
Although the case where the mold 30 includes the graphite sleeve 31 has been described, the present invention is not limited to this. For example, the mold 30 may be made of another material having solid lubricity such as boron nitride (BN).

Although the case where the inner peripheral surface of the through hole 46 of the heat insulating member 40 is arranged to be continuous with the inner peripheral surface of the casting hole 36 of the mold 30 has been described, the present invention is not limited to this. For example, the inner peripheral surface of the through hole 46 may recede radially outward from the inner peripheral surface of the casting hole 36. That is, the diameter of the through hole 46 may be larger than the diameter of the casting hole 36.
Moreover, the structural member of the casting_mold | template 30 is not limited to this embodiment. For example, the design of the structure of the cooling jacket 32 and the arrangement of the water cooling pipe (water channel 33) may be changed as appropriate.

  According to one aspect of the present invention, a copper alloy wire made of a copper alloy containing an active metal can be produced efficiently and stably. Since the copper alloy wire containing the active metal has high strength and good electrical conductivity, it can be used for, for example, a trolley wire for high-speed railways. One embodiment of the present invention can be suitably applied to the manufacturing process of this copper alloy wire.

  W ingot, 11 melting furnace, 13 holding furnace, 20 casting furnace, 30 mold, 30a upper end of mold, 40 heat insulating member, S01 molten copper production process, S02 active element addition process, S04 holding process, S05 casting process.

Claims (6)

A molten copper production process for dissolving the copper raw material to produce molten copper;
An active element addition step of adding one or more active elements of Cr, Zr, and Si into the molten copper;
A holding step of holding the molten copper in a casting furnace;
A casting step of continuously producing an ingot by a mold connected to the casting furnace,
The mold includes a graphite sleeve, and is connected to the lower side in the vertical direction of the casting furnace via a heat insulating member so that the hydraulic head pressure of the molten copper stored in the casting furnace acts in the mold. Has been
In the casting process, the molten copper is supplied into the mold by applying pressure toward the mold, and the molten copper is cooled and solidified in the mold. Production method.   The method for producing an active element-containing copper alloy wire according to claim 1, wherein the temperature of the mold is maintained at 450 ° C or lower.   The method for producing an active element-containing copper alloy wire according to claim 1 or 2, wherein the temperature of the molten copper in the heat insulating member portion is set to be higher than the melting point of the molten copper.   In the said casting process, the water head of the molten copper in a casting furnace from the upper end of the said mold is 100 mm or more, The active element containing copper alloy wire as described in any one of Claims 1-3 characterized by the above-mentioned. Production method.   The cross-sectional area ratio Sf / Sc between the horizontal cross-sectional area Sc of the mold and the horizontal cross-sectional area Sf of the casting furnace is 5 or more, according to any one of claims 1 to 4. The manufacturing method of the active element containing copper alloy wire of description.   A continuous melting furnace and a holding furnace are provided in a preceding stage of the casting furnace, and the molten copper generated in the molten copper generation step is continuously supplied into the casting furnace. The manufacturing method of the active element containing copper alloy wire as described in any one of claim | item 1 -5.

Images