Wire rod manufacturing method and wire rod manufacturing device

Abstract

To improve the productivity of a rough drawing wire made of a casting alloy comprising an additional element having high activity in respect to oxygen.SOLUTION: A rough drawing wire production device 100 comprises: a tundish 30 for storing molten metal 13; a mold 50 for continuously casting the molten metal 13 fed from the tundish 30; and an additional element feed part 40 for continuously feeding an additional element (wire 42) to the feed port of the mold 50.SELECTED DRAWING: Figure 3

Description

[Technical field]

[0001] The present invention relates to a method and an apparatus for producing a wire rod. [Background technology]

[0002] One method for continuously casting the casting alloy that is the raw material for the rough wire is to continuously pour molten metal containing the base metal of the casting alloy and additive elements into a mold and cast the molten metal (see, for example, Patent Document 1). [Prior art documents] [Patent documents]

[0003] [Patent Document 1] JP 2013-482255 A Summary of the Invention [Problem to be solved by the invention]

[0004] In the method for producing a wire rod using a continuous casting and rolling method, when an additive element is mixed into molten metal, it is preferable to mix the additive element into the molten metal before pouring the molten metal into a mold, taking into consideration the layout of a supply device for supplying the additive element to the molten metal. However, according to the study by the present inventors, it has been found that there are problems as follows. That is, when the molten metal with the additive element mixed therein is poured into the mold, oxygen and the like in the atmosphere existing between the tundish storing the molten metal and the mold may be mixed into the molten metal, and the molten metal with the oxygen and the like mixed in may be poured into the mold. In particular, when the additive element includes an element highly active against oxygen, a part of the additive element may react with oxygen, thereby reducing the yield of the wire rod. That is, when the wire rod is produced using molten metal including an additive element highly active against oxygen, the production efficiency of the wire rod may be reduced.

[0005] Therefore, an object of the present invention is to provide a technique for improving the production efficiency of a wire rod made of a cast alloy containing an additive element that is highly active against oxygen. [Means for solving the problem]

[0006] One embodiment of a method for producing a wire rod includes the steps of: [1] producing a wire rod obtained by continuous casting and rolling, and includes the steps of: (a) obtaining a molten metal made of a base material; (b) supplying the molten metal to a mold; (c) continuously supplying an additive element to the molten metal in the mold and mixing the additive element with the molten metal in the mold; and (d) continuously casting the molten metal mixed with the additive element in the mold to form a cast material.

[0007] [2] In the above [1], the additive element has a higher activity against oxygen than the base material.

[0008] [3] In [1], the added element is one or more elements selected from the group consisting of titanium (Ti), magnesium (Mg), zirconium (Zr), calcium (Ca), aluminum (Al), phosphorus (P), indium (In), and tin (Sn).

[0009] In the method according to [4][1], the additive element is made of a linear material and is continuously supplied to the molten metal in the mold from an additive element supply nozzle arranged between the mold and a tundish that stores the molten metal before it is supplied to the mold.

[0010] [5] In the method of [1], in the step (c), a first additive element is continuously supplied to the molten metal in the mold, and the molten metal supplied to the mold in the step (b) contains the base material and a second additive element having a lower activity against oxygen than the first additive element.

[0011] [6] Another embodiment of the apparatus for manufacturing a wire rod is an apparatus for manufacturing a wire rod obtained by continuous casting and rolling, and includes a tundish for storing molten metal, a mold for continuously casting the molten metal supplied from the tundish, and an additive element supply section for continuously supplying an additive element to a supply port of the mold.

[0012] [7][6] The additive element supply unit has an additive element supply nozzle that continuously supplies the additive element consisting of a linear material to the supply port of the mold, and the additive element supply nozzle is arranged between the tundish and the mold. Effect of the Invention

[0013] According to a representative embodiment of the present invention, it is possible to improve the production efficiency of a wire rod made of a cast alloy containing an additive element that is highly active against oxygen. [Brief description of the drawings]

[0014] [Figure 1] 1 is an explanatory diagram showing a configuration example of a continuous manufacturing apparatus for wire rods (continuous casting and rolling apparatus) according to an embodiment; [Diagram 2] 2 is an enlarged cross-sectional view showing an example of a cross-sectional shape of a groove formed in the peripheral portion of the casting wheel shown in FIG. 1. FIG. [Diagram 3] FIG. 2 is an explanatory diagram showing a schematic diagram of a state in which a wire made of an additive element is supplied into molten copper near a supply port of a mold. [Figure 4] FIG. 4 is an explanatory diagram showing a modified example of FIG. 3. [Diagram 5] FIG. 4 is an explanatory diagram showing a schematic diagram of the measurement results of the concentration distribution of additive elements in each of nine regions, the cross section of which is divided into nine regions and produced by the wire rod production apparatus shown in FIG. [Figure 6] FIG. 4 is an explanatory diagram showing a schematic diagram of the measurement results of the concentration distribution of additive elements in each of nine regions, in which a cross section of a cast material produced using a wire rod production apparatus, which is an example of consideration in relation to FIG. 3, is divided into nine regions. [Figure 7] FIG. 13 is an explanatory diagram showing a modified example. DETAILED DESCRIPTION OF THE PREFERRED EMBODIMENTS

[0015] Hereinafter, an embodiment of the present invention will be described with reference to the drawings.

[0016] <Example of wire rod manufacturing equipment configuration> FIG. 1 is an explanatory diagram showing an example of the configuration of a manufacturing apparatus for a wire rod according to this embodiment. FIG. 2 is an enlarged cross-sectional view showing an example of the cross-sectional shape of a groove formed on the periphery of the casting wheel shown in FIG. 1. A wire rod 80 manufactured in this embodiment is made of a cast alloy having copper as a base material and including additive elements contained in the base material. The wire rod 80 is a wire rod that is further elongated depending on the application and is used for applications such as a conductor wire. A method and an apparatus for manufacturing a wire rod 80, which is a copper wire rod made of a cast alloy having copper as a base material, will be described below.

[0017] 1, a manufacturing apparatus 100 for manufacturing rough wire rods according to the present embodiment includes a melting furnace 10, a holding furnace 20, a tundish 30, an additive element supplying section 40, a mold 50, a rolling section 60, and a winding section 70. The melting furnace 10 and the holding furnace 20, and the holding furnace 20 and the tundish 30 are connected by transfer troughs 11, respectively. A nozzle 31 is connected to the tundish 30, and the molten metal stored in the tundish 30 is supplied into the mold 50 through the nozzle 31 with the flow rate thereof adjusted by a flow rate adjusting pin (not shown).

[0018] The manufacturing method of the wire rod in this embodiment includes a step of melting copper (e.g., tough pitch copper, oxygen-free copper, high purity copper with a copper purity of 99.999% to 99.99999%), which is a base material of the cast alloy constituting the wire rod 80, to obtain molten metal (base material melting step). This base material melting step is performed in a melting furnace 10 shown in FIG. 1. The molten metal made of copper melted in the melting furnace 10 is transferred to a holding furnace 20 via a transfer trough 11. In the holding furnace 20, the molten metal is stored while maintaining the molten state. The molten metal stored in the holding furnace 20 is transferred sequentially to a tundish 30 via the transfer trough 11.

[0019] In the tundish 30, foreign objects (inclusions) present in the molten metal are removed (foreign object removal process). For example, foreign objects may be removed by scooping up the foreign objects floating on the surface of the molten metal. Note that while FIG. 1 shows an example in which the holding furnace 20 and the tundish 30 are connected via a transfer trough 11, as a modified example, a container called a ladle (not shown) may be interposed between the holding furnace 20 and the tundish 30. In this case, the removal of foreign objects may also be performed in the ladle.

[0020] The manufacturing method of the wire rod of this embodiment also includes a step of supplying molten metal stored in the tundish 30 to the mold 50 (molten metal supplying step). In the molten metal supplying step, for example, molten copper (molten metal) stored in the tundish 30 is supplied to the mold 50 via the nozzle 31. The mold 50 has a circular shape in a side view and includes a casting wheel 51 that rotates around the center of the circle as the rotation axis. In Fig. 1, the rotation direction r1 of the casting wheel 51 is shown diagrammatically.

[0021] As shown in Fig. 2, a groove 52 is formed on the periphery of the casting ring 51 in the circumferential direction of the casting ring 51. A casting belt 53 is also disposed on the periphery of the casting ring 51 so as to face the groove 52 of the casting ring 51, and the groove 52 and the casting belt 53 function as a mold for casting molten metal. The molten metal is supplied into the mold 50 (in other words, into the groove 52) shown in Fig. 2. The metal supplied into the groove 52 is cooled through the casting ring 51, and a cast material (ingot) 81 is obtained that is shaped into the shape of the mold 50, i.e., the shape of the groove 52.

[0022] Although the details will be described later, the manufacturing method of the wire rod of this embodiment includes a step of continuously supplying an additive element to the molten metal in the mold 50 (additive element supply step). The additive element to be added to the copper, which is the base material of the wire rod 80, is continuously supplied from the additive element supply section 40 to a supply port of the mold 50 through which the molten metal from the tundish 30 is supplied (hereinafter, also referred to as the supply port of the mold 50). That is, the groove 52 of the mold 50 is the supply port through which the molten metal from the tundish 30 is supplied, and the additive element is continuously supplied from the supply port to the molten metal in the mold 50. The wire 42 shown in FIG. 1 is a wire (linear object) obtained by forming the additive element into a linear shape. If the additive element is added to the supply port of the mold 50 as shown in FIG. 1, the additive element is stirred by the convection of the molten metal in the mold 50, and the molten metal and the additive element are mixed. The molten metal mixed with the additive element is then continuously cast to obtain a cast material 81 made of an alloy of the metal (eg, copper) constituting the base material and the additive element.

[0023] The manufacturing method of the wire rod of the present embodiment also includes a step (rolling step) of rolling the obtained cast material 81 to form a rolled material. In the rolling step, for example, the cast material 81 is gradually rolled using a plurality of rollers (not shown) provided in the rolling section 60 shown in Fig. 1 to roll it into a wire material such as the wire rod 80 to form the rolled material. The obtained rolled material is subjected to a surface cleaning treatment to obtain the wire rod 80.

[0024] The wire rod 80 obtained through the rolling process is wound onto a reel (not shown) by the winding unit 70, and after necessary inspection, is transported to a process for manufacturing a conductor. Alternatively, the wire rod 80 wound onto a reel by the winding unit 70 is shipped as an intermediate product after necessary inspection.

[0025] In the manufacturing method of the wire rod according to the present embodiment described above, the molten metal supplied into the mold before the additive element is mixed therein may be referred to as the "first molten metal," and the molten metal in the mold after the additive element is mixed therein may be referred to as the "second molten metal." For example, the manufacturing method of the wire rod according to the present embodiment is a manufacturing method of the wire rod obtained by continuous casting and rolling, and includes the steps of (a) obtaining a first molten metal made of a base material, (b) supplying the first molten metal into the mold, (c) continuously supplying the additive element to the first molten metal in the mold and mixing the additive element with the molten metal in the mold to obtain a second molten metal, and (d) continuously casting the second molten metal in the mold to form a cast material.

[0026] <Details of the additive element supply process> Next, the details of the additive element supplying process will be described. In the case of a rough wire used for a conductor, such as the rough wire 80, various additive elements may be added to the base metal in order to improve the function or characteristics when the wire is made into a conductor. The additive elements are added to the molten base metal. Considering the ease of adding the additive elements or the layout of the device, a method of adding the additive elements in the transfer trough 11 or the tundish 30 shown in FIG. 1 is preferable. For example, in the tundish 30, a process of floating and removing foreign matter contained in the molten metal may be performed, so that a space is secured above the liquid surface of the molten metal to a degree that the foreign matter can be removed. Therefore, if the additive elements are added using this space, the adding work can be easily performed. In addition, it is easy to secure a space for arranging an additive element supplying device.

[0027] However, according to the study by the inventors of the present application, it was found that the following problem occurs in the method of adding the additive element in the transfer trough 11 or the tundish 30. That is, when the molten metal mixed with the additive element is poured into the mold 50 in the tundish 30, oxygen in the atmosphere between the nozzle 31 connected to the tundish 30 storing the molten metal and the mold 50 is likely to be mixed in the molten metal. In particular, when the additive element contains an element that is highly active against oxygen, a part of the additive element reacts with oxygen before being alloyed. In this case, the oxidized additive element may not easily dissolve in the molten metal. The additive element that is not dissolved in the molten metal is not contained in the casting material 81, so in order to contain the additive element at a predetermined ratio in the casting material 81, it is necessary to supply a large amount of the additive element taking into account the ratio of the additive element that is not dissolved. That is, the addition yield decreases due to a part of the additive element reacting with oxygen.

[0028] Furthermore, when the proportion of the additive element that reacts with oxygen becomes high, the distribution of the additive element in the cast material 81 is likely to vary. As will be described in detail later, for example, when the cut surface of the cast material 81 is divided into a plurality of regions and the content ratio of the additive element in each of the plurality of regions is checked, there may be a portion with a locally high content ratio of the additive element. A region with an extremely high or extremely low content ratio of the additive element cannot be used as a product, and therefore, the region must be removed. In this case, the yield as the amount of the cast material 81 obtained relative to the amount of the charge including the base material decreases.

[0029] Furthermore, if the amount of additive elements that are insoluble in the molten metal increases, oxides of the additive elements will accumulate on the bottom of the tundish 30, etc., causing a shortening of the life of the tundish 30, etc.

[0030] The above-mentioned problem can be rephrased as a problem from the viewpoint of improving the manufacturing efficiency of the wire rod. According to the above-mentioned study by the inventors of the present application, it has been found that, from the viewpoint of improving the manufacturing efficiency of the wire rod, a technology for reducing the amount of the additive element that does not dissolve in the molten metal or a technology for making the distribution of the content ratio of the additive element in the cross-sectional view of the cast material 81 uniform is important.

[0031] Fig. 3 is an explanatory diagram showing a schematic state in which a wire made of an additive element is being supplied into molten metal (molten copper) 13 near the supply port of the mold shown in Fig. 2. As shown in Fig. 3, the manufacturing apparatus 100 for wire rod of this embodiment is structured so that a wire 42, which is an additive element formed into a linear shape, can be supplied from the supply port of the mold 50 to the molten metal 13 in the mold 50. The wire 42 is continuously paid out from a nozzle 41 provided in the additive element supply unit 40 along the rotation direction of the casting wheel 51. The nozzle 41 is disposed between the tundish 30 and the casting wheel 51.

[0032] 3, a portion of mold 50 where molten metal 13 is supplied from nozzle 31 and where molten metal 13 is in a state before solidification (molten state) is defined as pool portion 54. In pool portion 54, molten metal 13 is in a high temperature state. Furthermore, new high-temperature molten metal 13 is successively supplied to pool portion 54. Therefore, in pool portion 54, molten metal 13 as a fluid convects.

[0033] In the present embodiment, wire 42 is supplied to pool portion 54 of mold 50, and is melted in pool portion 54 by the heat of molten metal 13. In this case, the additive element is in a solid state until it is inserted into pool portion 54, so that even if it comes into contact with the atmosphere containing oxygen, the occurrence of excessive reaction with oxygen can be suppressed.

[0034] In addition, since the wire 42 melts in the pool portion 54, the additive element becomes liquid. The area of ​​the molten metal 13 in the pool portion 54 that is in contact with the air (the area of ​​the liquid surface) is smaller than that of the molten metal 13 in the tundish 30. Therefore, in the pool portion 54, the possibility that the molten additive element comes into contact with oxygen is lower than in the tundish 30. As a result, in the case of the method of the present embodiment, the frequency of the additive element reacting with oxygen can be suppressed compared to the method of adding the additive element to the tundish 30. If the reaction between the additive element and oxygen can be suppressed, the addition yield of the additive element can be improved, and the supply amount of the additive element can be reduced. In addition, if the reaction between the additive element and oxygen can be suppressed, the amount of oxide of the additive element that remains unmelted in the mold 50 can be reduced. Therefore, the life of the mold 50 can be suppressed from being reduced due to the oxide of the additive element. In addition, when the additive element is not added to the tundish 30, the life of the tundish 30 can be suppressed from being reduced due to the oxide of the additive element.

[0035] Furthermore, as described above, in pool portion 54, molten metal 13 convects as a fluid, so that the molten additive elements are easily stirred. As a result, the distribution of the additive elements in cast material 81 (see FIG. 1) obtained in this embodiment is likely to be uniform. If the distribution of the additive elements in cast material 81 can be uniformed, all of cast material 81 can be commercialized. As a result, the yield in terms of the amount of cast material 81 obtained relative to the amount of charge including the base material can be improved.

[0036] In the case of this embodiment, as described above, the frequency of reaction between the additive element and oxygen can be suppressed, so that this is particularly effective when using an element that has a higher activity against oxygen than the base metal (e.g., copper) as the additive element.

[0037] Examples of the additive element include titanium (Ti), magnesium (Mg), zirconium (Zr), calcium (Ca), aluminum (Al), phosphorus (P), indium (In), and tin (Sn). The additive element is not limited to one type, and for example, two or more types of elements among the specific examples of the additive elements described above may be added. An embodiment in which two or more types of additive elements are added will be described later as a modified example.

[0038] As a modification of the present embodiment, as shown in FIG. 4, there is a method in which a wire 42 containing an additive element is supplied to a pool portion 54 of a mold 50 from between a nozzle 31 and a casting belt 53. FIG. 4 is an explanatory diagram showing a modification of FIG. 3. A roughly drawn wire manufacturing apparatus 101 shown in FIG. 4 differs from the roughly drawn wire manufacturing apparatus 100 shown in FIG. 3 in the direction in which the wire 42 containing an additive element is supplied. In the example shown in FIG. 4, a nozzle 41 for supplying the additive element is disposed between the nozzle 31 and the casting belt 53. In this case, the distance from the nozzle 41 to the pool portion 54 is shorter than in the example shown in FIG. 3, so that the length of the portion of the wire 42 exposed to the outside of the nozzle 41 can be shortened.

[0039] However, in the case of the example shown in FIG. 4, since it is necessary to secure a space between the nozzle 31 and the casting belt 53 to insert the nozzle 31, the distance between the nozzle 31 and the pool portion 54 needs to be longer than that of the example shown in FIG. 3. In other words, when the nozzle 41 is disposed between the tundish 30 and the casting wheel 51 of the mold 50 as shown in FIG. 3, the distance between the nozzle 31 and the pool portion 54 can be shortened. From the viewpoint of reducing the area where the molten metal 13 discharged from the nozzle 31 comes into contact with the atmosphere and reducing the amount of oxygen in the atmosphere that is mixed in the molten metal 13, it is preferable to shorten the distance between the nozzle 31 and the pool portion 54. Therefore, from the viewpoint of suppressing the mixing of oxygen in the atmosphere into the molten metal 13, the embodiment shown in FIG. 3 is more preferable. The manufacturing apparatus 101 of the wire rod shown in FIG. 4 is the same as the manufacturing apparatus 100 of the wire rod shown in FIG. 3 except for the above-mentioned differences, so a duplicated description will be omitted.

[0040] <Evaluation> Next, a cast material produced by the wire rod manufacturing apparatus 100 shown in Fig. 3 will be compared with a cast material produced by a wire rod manufacturing apparatus that is an example of consideration for Fig. 3, and the results of an evaluation of a wire rod manufacturing method using the wire rod manufacturing apparatus 100 will be described. Fig. 5 is an example, and is an explanatory diagram that shows a schematic diagram of a measurement result of the concentration distribution of the added elements in each region, with a cross section of the cast material produced by the wire rod manufacturing apparatus shown in Fig. 3 divided into nine regions. Fig. 6 is an explanatory diagram that shows a schematic diagram of a measurement result of the concentration distribution of the added elements in each region, with a cross section of the cast material produced by the wire rod manufacturing apparatus that is an example of consideration for Fig. 3 divided into nine regions.

[0041] The cast material 81 shown in FIG. 5 and the cast material 82 shown in FIG. 6 are manufactured by different manufacturing methods in which the locations where the additive elements are supplied are different from each other. The cast material 81 shown in FIG. 5 is a cast material cast by the manufacturing method described with reference to FIG. 3. On the other hand, the cast material 82 shown in FIG. 6 is a cast material cast by a manufacturing apparatus for roughly drawn wire in which the wire 42 is supplied to the tundish 30 without supplying the wire 42 to the pool portion 54 shown in FIG. 3. Each of the cast material 81 shown in FIG. 5 and the cast material 82 shown in FIG. 6 shows a cut surface cut in a direction perpendicular to the longitudinal direction of the cast material molded by the mold. Each of the cast material 81 and the cast material 82 has a trapezoidal cut surface. As shown by the two-dot chain lines in FIG. 5 and FIG. 6, the cross section is divided into nine regions. In FIG. 5 and FIG. 6, the concentration of the additive element in each of the nine divided regions is described in ppm order. The manufacturing conditions of the cast material 81 shown in FIG. 5 and the cast material 82 shown in FIG. 6 are as follows. The base material is copper, and the additive element is titanium. Titanium has a higher activity against oxygen than copper. The amount of the additive element is set so that the concentration of the additive element in the entire alloy is 18 ppm in the embodiment shown in Figure 5, and 42 ppm in the comparative example shown in Figure 6.

[0042] As can be seen by comparing Fig. 5 and Fig. 6, the manufacturing method of the wire rod according to this embodiment can reduce the deviation in the concentration of the additive element in each of the nine regions into which the cast material 81 is divided. In the example shown in Fig. 5, the deviation is 0.31. In the case of the cast material 82 shown in Fig. 6, the deviation in the concentration of the additive element in the nine regions is 52.7. If the deviation is taken for the remaining eight regions excluding the region at the lower right of the page where the concentration is particularly high, the deviation is 5.2. It can therefore be seen that the manufacturing method of the wire rod according to this embodiment significantly improves the uniformity of the distribution of the additive element in the cast material 81.

[0043] Moreover, the average concentration of the nine regions shown in FIG. 5 is 17.9 ppm. The yield of the additive element contained in the cast material 81 relative to the amount of the additive element charged (18 ppm) is 99.5%. In the case of the cast material 82 shown in FIG. 6, the additive element is unevenly contained in the lower right region of the page, so the average of the eight regions excluding this region is 31.5 ppm. The yield of the additive element contained in the cast material 82 relative to the amount of the additive element charged (42 ppm) is 74.9%. From these results, it can be seen that the manufacturing method of the rough wire rod according to this embodiment allows the additive element to be efficiently contained in the cast material 81.

[0044] In the examples shown in Fig. 5 and Fig. 6, the additive element is titanium as an example. However, the same results can be obtained even if the additive element is changed to, for example, magnesium (Mg), zirconium (Zr), calcium (Ca), aluminum (Al), phosphorus (P), indium (In), or tin (Sn). In addition, even if the amount of additive is changed, the same results can be obtained, for example, as long as the concentration of the additive element in the casting material 81 is in the range of 1% or less.

[0045] <Example of adding multiple additive elements> Next, an embodiment in which a plurality of types of additive elements are added will be described as a modification of the example shown in Figures 3 and 4. Figure 7 is an explanatory diagram showing another modification of Figure 3.

[0046] The rough wire manufacturing apparatus 103 shown in FIG. 7 is equipped with an additive element supplying section 40 having a nozzle 41 that sequentially feeds out a wire 42 consisting of a first additive element, as well as an additive element supplying section 46 that sequentially supplies an additive 45 consisting of a second additive element to the molten metal 13 in the tundish 30.

[0047] As described above, in order to suppress the reaction between the additive element and oxygen, it is preferable that the additive element is supplied into the mold 50. However, when supplying a plurality of additive elements, depending on the number of additive elements, a method may be considered in which some of the plurality of additive elements are added in advance in the tundish 30, as shown as a modified example in FIG.

[0048] When an additive element is added in the tundish 30, there is a higher possibility of reaction with oxygen compared to when the additive element is added in the mold 50. Therefore, in the method for producing a wire rod using the wire rod production apparatus 103 shown in FIG. 7, the selection of the type of additive element is important.

[0049] That is, in the case of this modified example, in the additive element supplying step, a wire 42 made of a first additive element is continuously supplied to the molten metal in the mold 50. Also, the molten metal 13 supplied to the mold 50 in the molten metal supplying step contains a first metal (e.g., copper) which is a base material, and a second additive element which is less active to oxygen than the first additive element. The additive 45 made of the second additive element is, for example, phosphorus. The first additive element constituting the wire 42 is, for example, titanium, zirconium, or magnesium. In the case of such a combination, the second additive element is less active to oxygen than the first additive element. Therefore, the frequency of reaction between the additive element and oxygen can be suppressed in the tundish 30 compared to the case where the first additive element is added.

[0050] Although not shown, as a modification of FIG. 7, in the roughly drawn wire manufacturing apparatus 100 shown in FIG. 3, a plurality of wires 42 may be supplied from the additive element supply unit 40. In this case, the plurality of wires 42 may contain the same additive element or may contain different additive elements. For example, a first additive element constituting one wire 42 may be indium, and a second additive element constituting another wire 42 may be tin. In this modification, the additive concentration of the first additive element and the additive concentration of the second additive element may be different from each other.

[0051] In the above-described embodiment, a manufacturing method and a manufacturing apparatus for a rough wire rod have been described. However, the manufacturing method and the casting apparatus for a cast material can be realized by extracting the part of the manufacturing method for a rough wire rod that molds the casting material 81 shown in FIG. 1 .

[0052] The present invention is not limited to the above-described embodiment and examples, and various modifications are possible without departing from the spirit and scope of the present invention.

[0053] For example, a method of feeding the additive element in a linear shape is described above as a method of feeding the additive element successively into the molten metal. However, as a modified example, as shown diagrammatically as additive 45 in FIG. 7, a tableted additive element may be continuously fed into molten metal 13 in pool portion 53 shown in FIG. 3, FIG. 4, or FIG. 7. [Industrial Applicability]

[0054] The present invention is widely applicable to various conductors including electric wires. [Explanation of symbols]

[0055] 10 Melting furnace 11 Transport trough 13 Molten Metal 20 Holding furnace 30 Tundish 31 Nozzle 40,46 Additive element supply section 41, 44 Nozzle (additive element supply nozzle) 42 Wire 45 Additives 50 Mold 51 Casting Wheel 52 Groove 53 Casting Belt 54 Pool Club 60 Rolling Section 70 Winding section 80 Arahiki line 81,82 Casting material (ingot) 100, 101, 102 Wire rod manufacturing equipment r1 Rotation direction

Claims

1. A method for producing a wire rod obtained by continuous casting and rolling, comprising the steps of: (a) obtaining a molten metal comprising a base material; (b) delivering the molten metal to a mold; (c) continuously supplying an additive element to the molten metal in the mold and mixing the additive element with the molten metal in the mold; (d) continuously casting the molten metal mixed with the additive element in the mold to form a casting material; having The method for producing a wire rod, wherein the additive element has a higher activity against oxygen than the base material.

2. The method for producing a rough wire rod according to claim 1, The additive element is one or more elements selected from the group consisting of titanium (Ti), magnesium (Mg), zirconium (Zr), calcium (Ca), aluminum (Al), phosphorus (P), indium (In), and tin (Sn).

3. The method for producing a rough wire rod according to claim 1, The method for manufacturing a rough wire, wherein the additive element is made of a linear material and is continuously supplied to the molten metal in the mold from an additive element supply nozzle arranged between a tundish that stores the molten metal before it is supplied to the mold and the mold.

4. The method for producing a rough wire rod according to claim 1, In the step (c), a first additive element is continuously supplied to the molten metal in the mold; the molten metal supplied to the mold in the step (b) contains the base material and a second additive element having a lower activity to oxygen than the first additive element.

5. A manufacturing apparatus for wire rods obtained by continuous casting and rolling, comprising: a tundish for storing molten metal; a mold for continuously casting the molten metal supplied from the tundish; an additive element supply unit that continuously supplies an additive element having a higher oxygen activity than the base material to a supply port of the mold; The manufacturing apparatus for wire rod comprises:

6. 6. The wire rod manufacturing apparatus according to claim 5, the additive element supply unit has an additive element supply nozzle that continuously supplies the additive element consisting of a linear object to the supply port of the mold, the nozzle for supplying additional elements is disposed between the tundish and the mold.

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