Manufacturing method and manufacturing device of roughing rolling line

Abstract

A method and apparatus for manufacturing a roughing wire improve the manufacturing efficiency of a roughing wire composed of a casting alloy containing an additive element having high oxygen activity. The apparatus (100) for manufacturing a roughing wire comprises: a tundish (30) for storing molten metal (13); a casting mold (50) for continuously casting the molten metal (13) supplied from the tundish (30); and an additive element supply unit (40) for continuously supplying an additive element (wire 42) to a supply port of the casting mold (50).

Description

Technical Field

[0001] The present invention relates to a method for manufacturing a roughing rolling line and a manufacturing device thereof. Background Art

[0002] As a method for continuously casting a casting alloy as a raw material for a roughing line, there is a method of continuously pouring a molten metal mixed with a metal as a casting alloy base material and additive elements into a mold and continuously casting the molten metal (for example, see Patent Document 1).

[0003] Prior art literature

[0004] Patent Literature

[0005] Patent Document 1: Japanese Patent Application Laid-Open No. 2013-482255 Summary of the Invention

[0006] Problems to be solved by the invention

[0007] In a method for manufacturing a roughing wire using a continuous casting and rolling method, when an additive element is mixed with a molten metal, if the layout of a supply device for supplying the additive element to the molten metal is taken into consideration, it is preferable to pre-mix the additive element with the molten metal before injecting the molten metal into the mold. However, according to the research of the inventors of the present application, it has been found that there is the following problem. That is, when a molten metal pre-mixed with an additive element is injected into a mold, oxygen and the like in the atmosphere between the tundish storing the molten metal and the mold are sometimes drawn into the molten metal, and the molten metal in a state of being drawn into the oxygen and the like is injected into the mold. In particular, when the additive element includes an element with high activity toward oxygen, a portion of the additive element reacts with oxygen, thereby reducing the additive yield. That is, when a roughing wire is manufactured using a molten metal containing an additive element with high activity toward oxygen, the manufacturing efficiency of the roughing wire is sometimes reduced.

[0008] Therefore, an object of the present invention is to provide a technique for improving the production efficiency of a roughing mill made of a casting alloy containing an additive element having high activity with respect to oxygen.

[0009] Methods for solving problems

[0010] As one embodiment, a method for manufacturing a rough rolled wire is a method for manufacturing a rough rolled wire obtained by continuous casting and rolling [1], comprising: (a) a process of obtaining a molten metal composed of a base material, (b) a process of supplying the above-mentioned molten metal to a casting mold, (c) a process of continuously supplying an additive element to the above-mentioned molten metal in the above-mentioned casting mold, mixing the above-mentioned additive element with the above-mentioned molten metal in the above-mentioned casting mold, and (d) a process of continuously casting the above-mentioned molten metal mixed with the above-mentioned additive element in the above-mentioned casting mold, and forming the casting material.

[0011] [2] In [1], the activity of the added element toward oxygen is higher than that of the base material.

[0012] [3] In [1], the above-mentioned added elements are one or more elements selected from titanium (Ti), magnesium (Mg), zirconium (Zr), calcium (Ca), aluminum (Al), phosphorus (P), indium (In) and tin (Sn).

[0013] [4] In [1], the additive element is formed into a linear object and continuously supplied to the molten metal in the mold from an additive element supply nozzle arranged between the tundish and the mold, and the tundish stores the molten metal before it is supplied to the mold.

[0014] [5] In [1], in the above-mentioned (c) step, a first additive element is continuously supplied to the above-mentioned molten metal in the above-mentioned mold, and in the above-mentioned (b) step, the molten metal supplied to the above-mentioned mold contains the above-mentioned base material and a second additive element whose activity to oxygen is lower than that of the above-mentioned first additive element.

[0015] [6] As another embodiment, a manufacturing device for a rough rolling line is a manufacturing device for a rough rolling line 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 supplying portion for continuously supplying additive elements to a supply port of the mold.

[0016] [7] In [6], the above-mentioned additive element supply part has an additive element supply nozzle, and the above-mentioned additive element supply nozzle continuously supplies the above-mentioned additive element formed into a linear object to the above-mentioned supply port of the above-mentioned mold, and the above-mentioned additive element supply nozzle is arranged between the above-mentioned tundish and the above-mentioned mold.

[0017] Effects of the Invention

[0018] According to a typical embodiment of the present invention, it is possible to improve the production efficiency of a rough rolling line composed of a casting alloy containing an additional element having high activity with respect to oxygen. BRIEF DESCRIPTION OF THE DRAWINGS

[0019] Figure 1 It is an explanatory diagram showing a configuration example of a continuous manufacturing apparatus (continuous casting and rolling apparatus) of a roughing rolling line as one embodiment.

[0020] Figure 2 It means in Figure 1 An enlarged cross-sectional view of an example of the cross-sectional shape of a groove formed on the peripheral edge of the casting wheel shown.

[0021] Figure 3This is an explanatory diagram schematically showing a state in which a wire rod composed of an additive element is supplied to molten copper near a supply port of a mold.

[0022] Figure 4 Is relative to Figure 3 An illustration of a modified example of .

[0023] Figure 5 Will use Figure 3 The cross section of a cast material produced by the rough rolling line production apparatus shown is divided into nine regions, and is an explanatory diagram schematically showing measurement results of the concentration distribution of added elements in each region.

[0024] Figure 6 Is to use as relative to Figure 3 An explanatory diagram schematically showing measurement results of the concentration distribution of added elements in each region, with the cross section of the cast material produced by the rough rolling line production apparatus of the study example being divided into nine regions.

[0025] Figure 7 It is an explanatory diagram showing a modified example.

[0026] Explanation of symbols

[0027] 10: Melting furnace, 11: Transfer ladle, 13: Molten metal, 20: Holding furnace, 30: Tundish, 31: Nozzle, 40, 46: Additive element supply section, 41, 44: Nozzle (nozzle for supplying additive elements), 42: Wire rod, 45: Additive, 50: Mold, 51: Casting wheel, 52: Trough, 53: Casting strip, 54: Pool section, 60: Rolling section, 70: Coiler section, 80: Roughing line, 81, 82: Casting material (ingot), 100, 101, 102: Roughing line manufacturing device, r1: Rotation direction. DETAILED DESCRIPTION

[0028] Hereinafter, embodiments of the present invention will be described with reference to the accompanying drawings.

[0029] <Configuration Example of a Manufacturing Apparatus for a Rough Rolling Line>

[0030] Figure 1 It is an explanatory diagram showing a configuration example of a manufacturing apparatus for a roughing rolling line according to the present embodiment. Figure 2 It means in Figure 1 An enlarged cross-sectional view of an example of the cross-sectional shape of a groove formed on the peripheral edge of a casting wheel is shown. The roughing wire 80 manufactured in this embodiment is composed of a cast alloy with copper as the base material and containing additive elements contained in the base material. Roughing wire 80 is further extended to other applications, such as wire. A method for manufacturing roughing wire 80, a copper roughing wire composed of a cast alloy with copper as the base material, and a manufacturing apparatus for the roughing wire will be described below.

[0031] like Figure 1 As shown, a roughing mill manufacturing apparatus 100 according to this embodiment includes a melting furnace 10, a holding furnace 20, a tundish 30, an additive element supply unit 40, a mold 50, a rolling unit 60, and a coiling unit 70. The melting furnace 10 and the holding furnace 20, as well as the holding furnace 20 and the tundish 30, are connected via transfer chutes 11. Furthermore, a nozzle 31 is connected to the tundish 30. The molten metal stored in the tundish 30 is supplied to the nozzle 31 through a flow control pin (not shown) to adjust the flow rate of the molten metal supplied to the nozzle 31, and is then supplied to the mold 50 via the nozzle 31.

[0032] The manufacturing method of the rough rolling wire of this embodiment includes a step (a step of melting a base material) of copper (e.g., tough pitch copper, oxygen-free copper, or high-purity copper with a purity of 99.999% to 99.99999%), which is a base material of the cast alloy constituting the rough rolling wire 80, to obtain molten metal. Figure 1 The process is carried out in the melting furnace 10 shown. The molten metal composed of copper melted in the melting furnace 10 is transferred to the holding furnace 20 via the transfer launder 11. In the holding furnace 20, the molten metal is stored while being maintained in a molten state. The molten metal stored in the holding furnace 20 is sequentially transferred to the tundish 30 via the transfer launder 11.

[0033] In the tundish 30, foreign matter (inclusions) contained in the molten metal is removed (foreign matter removal process). As a method for removing foreign matter, there is a method of removing foreign matter floating on the liquid surface of the molten metal. Figure 1 , an example is shown in which the holding furnace 20 and the tundish 30 are connected via the transfer spout 11. However, as a modification, a container called a ladle (not shown) may be interposed between the holding furnace 20 and the tundish 30. In this case, foreign matter removal may also be performed in the ladle.

[0034] In addition, the manufacturing method of the rough rolling line of this embodiment includes a step of supplying the molten metal stored in the tundish 30 to the mold 50 (molten metal supply step). In the molten metal supply step, for example, molten copper (molten metal) accumulated in the tundish 30 is supplied to the mold 50 via the nozzle 31. The mold 50 is circular in side view and has a casting wheel 51 that rotates around the center of the circle as a rotation axis. Figure 1 The rotation direction r1 of the casting wheel 51 is schematically shown in FIG.

[0035] like Figure 2As shown in FIG. 1 , a groove 52 is formed on the periphery of the casting wheel 51 along the circumferential direction of the casting wheel 51. In addition, a casting belt 53 is arranged on the periphery of the casting wheel 51 so as to face the groove 52 of the casting wheel 51. The groove 52 and the casting belt 53 function as a mold for casting molten metal. The molten metal is supplied to Figure 2 The metal supplied to the tank 52 is cooled by the casting wheel 51 to obtain a cast material (ingot) 81 formed into the shape of the mold 50 , that is, the shape of the tank 52 .

[0036] The method for manufacturing a roughing wire in this embodiment includes a step of continuously supplying an additive element to the molten metal within the mold 50 (an additive element supplying step), which will be described in detail later. The additive element added to the copper serving as the base material of the roughing wire 80 is continuously supplied from the additive element supply unit 40 to a supply port in the mold 50 that supplies the molten metal from the tundish 30 (hereinafter also referred to as the supply port of the mold 50). Specifically, the trough 52 of the mold 50 serves as the supply port for the molten metal from the tundish 30, and the additive element is continuously supplied from the supply port to the molten metal within the mold 50. Figure 1 The wire material 42 shown is a wire material (wire-like object) formed by forming the additive elements into a wire shape. Figure 1 As shown, when an additive element is added to the supply port of the mold 50, the additive element is stirred by convection of the molten metal within the mold 50, and the molten metal and the additive element are mixed. Then, by continuously casting the molten metal mixed with the additive element, a cast material 81 composed of an alloy of the metal constituting the base material (e.g., copper) and the additive element is obtained.

[0037] In addition, the manufacturing method of the rough rolling line of this embodiment has a process (rolling process) of rolling the obtained casting material 81 to shape the rolled material. In the rolling process, for example, Figure 1 The plurality of rollers (not shown) provided in the rolling section 60 shown in the figure gradually roll the cast material 81 into a wire rod such as a rough rolled wire 80. The rough rolled wire 80 is obtained by performing a surface cleaning treatment on the obtained rolled material.

[0038] The rough rolled wire 80 obtained through the rolling process is wound onto a reel (not shown) by the coiling unit 70 and, after necessary inspection, is transported to the wire manufacturing process. Alternatively, the rough rolled wire 80 wound onto a reel by the coiling unit 70 is shipped as an intermediate product after necessary inspection.

[0039] It should be noted that in the above-described method for producing a roughing wire according to the present embodiment, the molten metal before the additive elements are mixed into the mold may be referred to as the "first molten metal," and the molten metal in the mold after the additive elements are mixed may be referred to as the "second molten metal." For example, the method for producing a roughing wire according to the present embodiment is a method for producing a roughing wire by continuous casting and rolling, comprising: (a) a step of obtaining a first molten metal composed of a base material; (b) a step of supplying the first molten metal into the mold; (c) a step of continuously supplying the additive elements to the first molten metal in the mold, mixing the additive elements with the molten metal in the mold, and producing a second molten metal; and (d) a step of continuously casting the second molten metal into the mold to form a cast material.

[0040] <Details of the Additive Element Supply Process>

[0041] Next, the details of the above-mentioned additive element supply process will be described. In the case of a roughing wire such as the roughing wire 80 used for conducting wires, various additive elements are sometimes added to the base metal in order to improve the function or characteristics when conducting wires. These additive elements are added to the molten base metal. Considering the ease of the operation of adding additive elements or the layout of the equipment, it is preferable to add the additive elements at the same time. Figure 1 The method for adding additive elements to the transfer launder 11 and tundish 30 shown in the figure. For example, in the tundish 30, a process of floating and removing foreign matter contained in the molten metal is sometimes performed. Therefore, sufficient space is secured above the molten metal surface to allow for this removal. Therefore, utilizing this space for adding additive elements allows for a more discreet addition process. Furthermore, it is easier to secure space for the supply device for the additive elements.

[0042] However, the inventors' research has revealed that the following issues arise when adding additive elements to the transfer launder 11 or tundish 30. Specifically, when molten metal mixed with additive elements is poured into the mold 50 from the tundish 30, oxygen and other substances in the atmosphere between the nozzle 31 connected to the tundish 30 storing the molten metal and the mold 50 are easily drawn into the molten metal. In particular, when the additive elements include an element with high oxygen reactivity, a portion of the additive elements reacts with oxygen before alloying. In this case, the oxidized additive elements may become difficult to dissolve in the molten metal. Since additive elements that do not dissolve in the molten metal are not contained in the cast material 81, in order to ensure that the cast material 81 contains additive elements at a predetermined ratio, a larger amount of additive elements must be supplied, taking into account the proportion of the undissolved additive elements. This means that the reaction of a portion of the additive elements with oxygen reduces the additive yield.

[0043] Furthermore, if the proportion of oxygen-reactive additive elements increases, the distribution of additive elements in the cast material 81 is likely to deviate. Details will be described later. For example, if a cross-section of the cast material 81 is divided into multiple regions and the content ratios of additive elements in each region are determined, there may be areas with locally high content ratios of additive elements. Regions with extremely high or low content ratios of additive elements cannot be used as products, and therefore need to be removed. In this case, the yield of the cast material 81, that is, the amount of cast material 81 obtained relative to the amount of base material input, is reduced.

[0044] Furthermore, if the amount of the added element insoluble in the molten metal increases, oxides of the added element accumulate at the bottom of the tundish 30 and the like, thereby causing a reduction in the life of the tundish 30 and the like.

[0045] The above problem can also be said to be a problem from the perspective of improving the manufacturing efficiency of the roughing line. Based on the above research by the inventors of this application, it has been found that from the perspective of improving the manufacturing efficiency of the roughing line, it is important to reduce the amount of additive elements insoluble in the molten metal or to make the distribution of the content ratio of the additive elements in the cross-section of the cast material 81 uniform.

[0046] Figure 3 It is schematically represented in Figure 2 FIG. 1 is an explanatory diagram of a state in which a wire rod composed of additive elements is supplied to a molten metal (molten copper) 13 near a supply port of a mold. Figure 3 As shown, the roughing wire manufacturing apparatus 100 of this embodiment is configured to supply a wire rod 42, which is an additive element formed into a linear shape, from a supply port of a mold 50 to the molten metal 13 in the mold 50. The wire rod 42 is continuously drawn 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.

[0047] exist Figure 3 In the present invention, the portion of the mold 50 where the molten metal 13 is supplied from the nozzle 31, that is, the portion of the molten metal 13 before solidification (molten state) is defined as the pool 54. In the pool 54, the molten metal 13 is at a high temperature. Furthermore, the high-temperature molten metal 13 is continuously supplied to the pool 54. Therefore, the molten metal 13, which is a fluid, undergoes convection in the pool 54.

[0048] In the present embodiment, the wire rod 42 is supplied to the pool portion 54 of the mold 50 and melted in the pool portion 54 by the heat of the molten metal 13. In this case, since the added element is in a solid state until it is inserted into the pool portion 54, even when it comes into contact with an oxygen-containing atmosphere, the occurrence of excessive reaction with oxygen can be suppressed.

[0049] Furthermore, since the wire 42 dissolves within the pool 54, the additive element becomes liquid. The area of ​​the molten metal 13 in the pool 54 that is in contact with the atmosphere (the area of ​​the liquid surface) is smaller than that within the tundish 30. Therefore, the likelihood of the molten additive element coming into contact with oxygen is lower within the pool 54 than within the tundish 30. As a result, the method of this embodiment can reduce the frequency of reactions between the additive element and oxygen compared to methods that add additive elements to the tundish 30. Suppressing reactions between the additive element and oxygen improves the yield of the additive element addition, thus reducing the amount of additive element supplied. Furthermore, suppressing reactions between the additive element and oxygen reduces the amount of additive element oxides that remain undissolved within the mold 50. This reduces the life of the mold 50 due to the oxides of the additive element. Furthermore, when no additive element is added to the tundish 30, the life of the tundish 30 due to the oxides of the additive element can be reduced.

[0050] In addition, as described above, in the pool portion 54, the molten metal 13 as a fluid generates convection, so the molten additive elements are easily stirred. As a result, the cast material 81 obtained by this embodiment (see Figure 1 ) can be easily uniformized. If the distribution of the added elements in the casting material 81 can be uniformized, the entire casting material 81 can be commercialized. As a result, the yield of the casting material 81 relative to the input amount including the base material can be increased, that is, the yield rate.

[0051] In the case of this embodiment, as described above, the frequency of the reaction between the additive element and oxygen can be suppressed. Therefore, it is particularly effective when an element having a higher activity with respect to oxygen than the base metal (eg, copper) is used as the additive element.

[0052] Examples of additive elements include titanium (Ti), magnesium (Mg), zirconium (Zr), calcium (Ca), aluminum (Al), phosphorus (P), indium (In), or tin (Sn). Furthermore, the additive element is not limited to one type; for example, two or more of the aforementioned specific examples of additive elements may be added. The embodiment in which two or more additive elements are added will be described later as a modified example.

[0053] In addition, as a modification of this embodiment, Figure 4 As shown, there is a method of supplying a wire rod 42 containing an added element from between the nozzle 31 and the casting belt 53 to the pool portion 54 of the mold 50 . Figure 4 Is relative to Figure 3 An illustration of a modified example of . Figure 4 In the manufacturing apparatus 101 of the rough rolling wire shown in FIG. 1 , the direction of supplying the wire rod 42 composed of the additive elements is the same as that of the wire rod 42 of FIG. Figure 3 The manufacturing apparatus 100 of the roughing line shown is different. Figure 4 In the example shown, the nozzle 41 for supplying the additional element is arranged between the nozzle 31 and the casting belt 53. In this case, Figure 3 Compared with the illustrated example, the distance from the nozzle 41 to the pool portion 54 is shorter, so the length of the portion of the wire 42 exposed to the outside of the nozzle 41 can be shortened.

[0054] However, in Figure 4 In the case of the example shown, it is necessary to ensure a space between the nozzle 31 and the casting belt 53 for inserting the nozzle 31, so the distance between the nozzle 31 and the pool portion 54 needs to be larger than Figure 3 In other words, if Figure 3 As shown, when the nozzle 41 is arranged between the tundish 30 and the casting wheel 51 of the mold 50, the distance between the nozzle 31 and the pool 54 can be made close. From the viewpoint of reducing the area of ​​contact between the molten metal 13 discharged from the nozzle 31 and the atmosphere and reducing the oxygen in the atmosphere that is drawn into the molten metal 13, it is preferable to make the distance between the nozzle 31 and the pool 54 close. Therefore, from the viewpoint of suppressing the oxygen in the atmosphere from being drawn into the molten metal 13, it is preferable to Figure 3 The embodiment shown. Figure 4 The manufacturing apparatus 101 of the roughing mill shown in FIG. 1 is different from the apparatus 101 of the roughing mill shown in FIG. Figure 3 The manufacturing apparatus 100 of the rough rolling line shown is the same, and therefore redundant description is omitted.

[0055] <Evaluation>

[0056] Next, the Figure 3 The casting material produced by the manufacturing apparatus 100 of the rough rolling line shown in FIG. Figure 3 The results of the evaluation of the method for manufacturing a roughing wire using the manufacturing apparatus 100 for a roughing wire will be described by comparing the results with the cast materials manufactured by the manufacturing apparatus for a roughing wire of the study example. Figure 5 This is an example that will be used Figure 3 The cross section of a cast material produced by the rough rolling line production apparatus shown is divided into nine regions, and is an explanatory diagram schematically showing measurement results of the concentration distribution of added elements in each region. Figure 6 Is to use as Figure 3 The cross section of a cast material produced by a roughing mill production apparatus according to a comparative example is divided into nine regions, and is an explanatory diagram schematically showing measurement results of the concentration distribution of added elements in each region.

[0057] Figure 5 The casting material 81 shown and Figure 6 The cast material 82 shown is produced by production methods in which the locations where the additive elements are supplied are different from each other. Figure 5 The casting material 81 shown is formed by using Figure 3 A method for producing a cast material is described. Figure 6 The casting material 82 shown is made of Figure 3 The pool portion 54 shown is used to supply the wire rod 42, and the tundish 30 is used to supply the casting material cast by the roughing wire manufacturing apparatus. Figure 5 The casting material 81 shown and Figure 6 The casting material 82 shown in the figure shows a cross section cut in a direction perpendicular to the longitudinal direction of the casting material formed by the casting mold. The casting material 81 and the casting material 82 each have a trapezoidal cross section. Figure 5 and Figure 6 In the figure, the cross section is divided into 9 regions as shown by the double-dashed lines. Figure 5 and Figure 6 The concentration of the added element in each of the nine regions is reported in ppm. Figure 5 The casting material 81 shown and Figure 6 The manufacturing conditions of the casting material 82 shown are as follows. The base material is copper and the additive element is titanium. Compared with copper, titanium has a higher activity towards oxygen. In addition, the amount of the additive element is set so that the concentration of the additive element relative to the total alloy is between Figure 5 In the example shown, the amount is 18 ppm. Figure 6 In the comparative example shown, the amount was 42 ppm.

[0058] Compare Figure 5 and Figure 6 It can be seen that according to the manufacturing method of the rough rolling line involved in this embodiment, the dispersion of the concentration of the added elements can be reduced in each of the nine regions into which the cast material 81 is divided. Figure 5 In the example shown, the deviation is 0.31. Figure 6 In the case of the cast material 82 shown, the concentration variation of the additive elements in the nine regions is 52.7. In particular, excluding the region in the lower right corner of the drawing where the concentration is high, the variation in the remaining eight regions is 5.2. Therefore, it can be seen that the roughing line manufacturing method according to this embodiment significantly improves the uniformity of the distribution of the additive elements in the cast material 81.

[0059] in addition, Figure 5 The average concentration of the nine regions shown is 17.9 ppm. The yield of the additive elements contained in the casting material 81 relative to the input amount of the additive elements (18 ppm) is 99.5%. Figure 6In the case of cast material 82 shown, the additive elements are concentrated in the lower right region of the drawing, so the average content of the other eight regions is 31.5 ppm. The yield of the additive elements contained in cast material 82 relative to the input additive element amount (42 ppm) is 74.9%. Based on these results, the roughing mill manufacturing method according to this embodiment can effectively contain additive elements in cast material 81.

[0060] It should be noted that in Figure 5 and Figure 6 In the example shown, titanium is used as the additive element. However, similar results can be achieved by changing the additive element to, for example, magnesium (Mg), zirconium (Zr), calcium (Ca), aluminum (Al), phosphorus (P), indium (In), or tin (Sn). Furthermore, similar results can be achieved even when the input amount is changed, for example, within the range of 1% or less of the additive element concentration in the casting material 81.

[0061] <Example of adding multiple additional elements>

[0062] Then, as relative to Figure 3 and Figure 4 As a modification of the illustrated example, an embodiment in which a plurality of additional elements are added will be described. Figure 7 Is relative to Figure 3 An illustration of other modified examples of .

[0063] Figure 7 The manufacturing device 103 of the roughing wire shown has, in addition to an additive element supplying section 40 having a nozzle 41 for sequentially feeding out a wire rod 42 composed of a first additive element, an additive element supplying section 46 for sequentially supplying an additive 45 composed of a second additive element to the molten metal 13 in the tundish 30.

[0064] As described above, in order to suppress the reaction between the additive element and oxygen, it is preferable to supply the additive element into the mold 50. However, when supplying multiple additive elements, the amount of the additive element is different, and the layout of the equipment around the pool portion 54 is considered. Figure 7 As a modified example, a method of adding some of the plurality of additional elements to the tundish 30 in advance is shown.

[0065] When adding the additive element to the tundish 30, the possibility of reaction with oxygen is higher than when adding the additive element to the mold 50. Figure 7 In the method for manufacturing a roughing wire using the apparatus 103 for manufacturing a roughing wire shown, it is important to select the type of the added element.

[0066] Specifically, in this modified example, during the additive element supply step, a wire rod 42 composed of a first additive element is continuously supplied to the molten metal within the mold 50. Furthermore, the molten metal 13 supplied to the mold 50 during the molten metal supply step contains a first metal (e.g., copper) serving as a base metal and a second additive element having a lower oxygen activity than the first additive element. An example of the additive 45 composed of the second additive element is phosphorus. An example of the first additive element constituting the wire rod 42 is titanium, zirconium, or magnesium. With this combination, the second additive element has a lower oxygen activity than the first additive element. Therefore, the frequency of the reaction between the additive element and oxygen in the tundish 30 can be reduced compared to when the first additive element is added.

[0067] In addition, although the illustration is omitted, Figure 7 A variation of Figure 3 In the rough-rolled wire manufacturing apparatus 100 shown, multiple wires 42 may be supplied from the additive element supply unit 40. In this case, the multiple wires 42 may contain the same additive element or different additive elements. For example, one wire 42 may contain indium as the first additive element, while another wire 42 may contain tin as the second additive element. In this modified example, the concentration of the first additive element and the concentration of the second additive element can be different.

[0068] It should be noted that, in the above-mentioned embodiment, the manufacturing method of the roughing wire and the manufacturing apparatus of the roughing wire are described, but the manufacturing method of the roughing wire can also be extracted. Figure 1 The portion shown up to the portion where the cast material 81 is formed serves as a method for manufacturing the cast material and a casting apparatus.

[0069] The present invention is not limited to the above-described embodiment and examples, and various modifications can be made without departing from the spirit and scope of the invention.

[0070] For example, as a method of supplying additive elements, a method of sequentially feeding the additive elements formed into a linear shape into the molten metal has been described. However, as a modified example, Figure 7 As shown schematically in the additive 45, sometimes the tableted additive element is continuously supplied to the Figure 3 、 Figure 4 or Figure 7 The molten metal 13 in the pool 53 is shown.

[0071] Industrial applicability

[0072] The present invention can be widely applied to various conductive wires including electric wires.

Claims

1. A method for manufacturing a roughing line, which is a method for manufacturing a roughing line obtained by continuous casting and rolling, comprising: (a) a step of obtaining a molten metal containing a base material, (b) supplying the molten metal to the mold, (c) a step of continuously supplying an additive element to the molten metal in the mold to mix the additive element with the molten metal in the mold, and (d) a step of continuously casting the molten metal mixed with the additional elements in the mold to shape the cast material, The activity of the added element to oxygen is higher than that of the base material.

2. The method for manufacturing a roughing rolling line according to claim 1, wherein: The added elements are 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 manufacturing a roughing rolling line according to claim 1, wherein: The additive element is formed into a linear object and continuously supplied to the molten metal in the mold from an additive element supply nozzle disposed between the tundish and the mold. The tundish stores the molten metal before supplying it to the mold.

4. The method for manufacturing a roughing rolling line according to claim 1, wherein: In the step (c), a first additional 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 additional element having an activity with respect to oxygen lower than that of the first additional element.

5. A manufacturing device for a roughing line, which is a manufacturing device for a roughing line obtained by continuous casting and rolling, comprising: Tundish, which stores molten metal containing parent metal, a mold that continuously casts the molten metal supplied from the tundish, and an additional element supplying portion that continuously supplies the additional element to the supply port of the mold; The activity of the added element to oxygen is higher than that of the base material.

6. The manufacturing device of the roughing rolling line according to claim 5, wherein: The additive element supply unit includes an additive element supply nozzle, and the additive element supply nozzle continuously supplies the additive element formed into a linear object to the supply port of the mold. The additive element supply nozzle is arranged between the tundish and the mold.

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