JP2021142543A - Apparatus and method for producing roughly drawn wire - Google Patents

Abstract

To provide an apparatus and method for producing a roughly drawn wire, which prevents blowhole defects from occurring.SOLUTION: A method for producing a roughly drawn wire includes a molten metal-supplying step, a casting step, and a guiding step. In the molten metal-supplying step, a molten metal is supplied to a casting mold from a nozzle. In the casting step, the molten metal supplied in the molten metal-supplying step is solidified to produce the roughly drawn wire. In the guiding step, the molten metal supplied from the nozzle is partially guided to a guiding direction different from a direction going toward a solidification region where the molten metal is solidified, during a step between the molten metal-supplying step and the casting step.SELECTED DRAWING: Figure 2

Description

The present disclosure relates to a rough wire manufacturing apparatus and a rough wire manufacturing method for manufacturing a rough wire by casting.

In a casting apparatus for casting a metal member, the metal member is cast by pouring molten metal into a mold and cooling the metal in the mold.
Patent Document 1 describes a casting apparatus using a dipping nozzle for pouring a molten metal in a state where the tip is immersed in the molten metal inside the mold. Further, Patent Document 2 describes a casting apparatus in which the tip of a pouring nozzle for pouring molten metal is not immersed in the molten metal.

Japanese Unexamined Patent Publication No. 07-164124 Japanese Unexamined Patent Publication No. 2010-22178

In the case of a casting device that does not use a dipping nozzle, that is, in the case of a casting device that pours a molten metal into a mold without the tip of the pouring nozzle being immersed in the molten metal of the mold, bubbles are generated by pouring the molten metal into the mold. Occurs. Then, the generated bubbles enter the inside of the molten metal in the mold along the flow of the molten metal into which the molten metal is poured. When the bubbles that have entered are taken into the solidified metal, a so-called blowhole defect occurs.

One aspect of the present disclosure is an object of the present invention to provide a rough drawn wire manufacturing apparatus and a rough drawn wire manufacturing method for suppressing the occurrence of blowhole defects.

One aspect of the present disclosure is a rough drawn wire manufacturing method, which includes a molten metal supply step, a casting step, and an induction step. In the molten metal supply process, the molten metal is supplied from the nozzle to the mold. In the casting process, the molten metal supplied to the mold by the molten metal supply process is solidified to produce a casting material. The induction process is a process between the molten metal supply process and the casting process, and is a solid in which a part of the metal molten metal supplied from the nozzle is solidified on the surface of the metal molten metal supplied to the mold. It guides in a direction different from the direction toward the chemical region.

One aspect of the present disclosure is a rough drawn wire manufacturing apparatus, which includes a molten metal supply unit, a casting unit, and an induction unit. The molten metal supply unit has a nozzle for supplying the molten metal to the mold. The casting unit solidifies the molten metal supplied to the mold by the molten metal supply unit to produce a casting material. The induction part is a part between the molten metal supply part and the casting part, and is a solid in which a part of the metal molten metal supplied from the nozzle is solidified on the surface of the metal molten metal supplied to the mold. It guides in a direction different from the direction toward the chemical region.

According to such a configuration, a part of the molten metal supplied from the nozzle is guided in an induction direction different from the direction in which the molten metal is directed toward the solidification region on the surface of the molten metal supplied to the mold. .. As a result, it is possible to prevent bubbles from entering the molten metal into the solidified region.

That is, it is possible to suppress the occurrence of blowhole defects caused by the bubbles that have entered.

It is the figure which represented the structure of the rough wire manufacturing apparatus schematically. FIG. 5 is a schematic cross-sectional view showing pouring of molten copper in a state where a three-dimensional object is arranged in the rough drawn wire manufacturing apparatus according to the embodiment. It is sectional drawing which showed the pouring of molten copper in the state which the three-dimensional object is not arranged in the rough drawing wire manufacturing apparatus. It is a figure which showed the relationship between the average value of the distance from the surface of a rough line to the upper end of a BH defect, and the total number of BH defects.

[1. composition]
The rough drawn wire manufacturing apparatus 1 which is a continuous casting apparatus for producing the rough drawn wire in the present embodiment will be described with reference to FIG.

The rough drawn wire manufacturing apparatus 1 in the present embodiment is configured to continuously cast rough drawn wires of a copper alloy material.
The roughing wire manufacturing apparatus 1 includes a melting furnace 2, an upper gutter 4, a holding furnace 6, a lower gutter 8, a tundish 10, a casting machine 16, a continuous rolling apparatus 18, and a coiler 20.

The melting furnace 2 is configured to heat and melt copper, which is a raw material, to produce molten copper 110. The melting furnace 2 may have, for example, a furnace body and a burner. The melting furnace 2 is configured to continuously generate molten copper 110 by charging copper as a raw material into the furnace body and heating it with a burner.

The upper gutter 4 is configured to transfer the molten copper 110 produced in the melting furnace 2 to the holding furnace 6 on the downstream side. The upper gutter 4 is provided on the downstream side of the melting furnace 2. That is, the upper gutter 4 is arranged at a position where the molten copper 110 flows out from the melting furnace 2. The upper gutter 4 is configured to connect between the melting furnace 2 and the holding furnace 6. The upper gutter 4 may be inclined downward so that the molten copper 110 flows from the melting furnace 2 toward the holding furnace 6, for example.

The holding furnace 6 is configured to heat the molten copper 110 transferred from the upper gutter 4 at a predetermined temperature and temporarily store it. Further, the holding furnace 6 is configured to hold the molten copper 110 at a predetermined temperature and transfer a predetermined amount of the molten copper 110 to the lower gutter 8. The holding furnace 6 is provided on the downstream side of the upper gutter 4. Examples of the metal element (alloy element) added to the molten copper 110 include tin (Sn), indium (In), magnesium (Mg), aluminum (Al), titanium (Ti), berylium (Be), and zirconium ( Zr), cerium (Ce), manganese (Mn), silicon (Si), yttrium (Y) and the like. At least one of these metallic elements is added to the molten copper 110.

The lower gutter 8 is configured to transfer the molten copper 110 transferred from the holding furnace 6 to the tundish 10 on the downstream side. The lower gutter 8 is provided on the downstream side of the holding furnace 6.
The devices from the upper gutter 4 to the tundish 10 may be configured to continuously add a predetermined metal element (alloy element) to the supplied molten copper 110.

The tundish 10 temporarily stores the molten copper 110, and supplies the stored molten copper 110 to the casting machine 16 in predetermined amounts. The tundish 10 is provided on the downstream side of the lower gutter 8. The tundish 10 includes a pot 12 and a pouring nozzle 14. The pot 12 is configured to temporarily store the molten copper 110 transferred from the lower gutter 8. The pouring nozzle 14 is provided on the downstream side of the pot 12. The pouring nozzle 14 is arranged in a state where its tip is not immersed in the molten metal surface (that is, the liquid surface of the molten metal) 110a supplied to the casting machine 16. The pouring nozzle 14 has an opening so as to continuously supply a predetermined amount of molten copper 110 temporarily stored in the pot 12 to the casting machine 16. The size of the opening of the pouring nozzle 14 may be formed to, for example, a size of 13 mm × 30 mm. The pouring nozzle 14 is made of, for example, ceramic. Specifically, the pouring nozzle 14 is made of a heat-resistant material such as silicon oxide, silicon carbide, or silicon nitride. An adjusting member for adjusting the supply amount of the molten copper 110 to be poured into the casting machine 16 via the pouring nozzle 14 may be provided in the vicinity of the opening of the pouring nozzle 14.

The casting machine 16 is a so-called belt-and-wheel type continuous casting machine. The casting machine 16 includes a wheel 162 and a belt 164. The wheel 162 is also referred to as a ring.
The wheel 162 is formed in an annular shape. The wheel 162 has a groove having a predetermined cross-sectional shape on the outer circumference formed in an annular shape. The shape of the groove may be, for example, a U-shaped cross section. In other words, the groove may be formed so as to be deeper from the outside toward the center of the wheel 162 with respect to the center of the annular shape of the wheel 162.

The belt 164 is formed so as to orbit around the peripheral surface of the wheel 162 while contacting a part of the outer peripheral surface of the wheel 162.
The space formed between the groove formed in the wheel 162 and the belt 164 is configured so that the molten copper 110 poured from the tundish 10 enters.

Further, the wheel 162 and the belt 164 are configured to be cooled to a temperature lower than the temperature of the molten copper 110. The configuration for cooling the wheel 162 and the belt 164 may be, for example, a cooling mechanism in which cooling water circulates inside the wheel 162 and the belt 164. By cooling by the cooling mechanism, the molten copper 110 poured between the groove of the wheel 162 and the belt 164 is solidified. As a result of the molten copper 110 solidifying, the copper casting material 120 having a cross-sectional shape corresponding to the shape of the groove portion of the wheel 162 and the belt 164 is continuously cast. The cast copper casting material 120 is transferred to the continuous rolling apparatus 18.

The continuous rolling apparatus 18 is configured to form a copper roughing wire 130 having a predetermined outer shape by rolling the copper casting material 120. The continuous rolling apparatus 18 is configured to continuously hot-roll the copper casting material 120 transferred from the casting machine 16, for example. The continuous rolling apparatus 18 is provided on the downstream side of the casting machine 16. The downstream side of the casting machine 16 referred to here is the side on which the copper casting material 120 is discharged from the casting machine 16.

The coiler 20 is provided on the downstream side of the continuous rolling apparatus 18. Here, the downstream side of the continuous rolling apparatus 18 means the side from which the copper roughing wire 130 is discharged from the continuous rolling apparatus 18. The coiler 20 is configured to wind up the copper roughing wire 130 transferred from the continuous rolling apparatus 18.

Here, the details of the space formed by the groove portion of the wheel 162 of the casting machine 16 and the belt 164 and the region including the pouring nozzle 14 of the tundish 10 for pouring the molten copper 110 are as follows.

FIG. 2 is a schematic cross-sectional view showing pouring of molten copper in a state where a three-dimensional object is arranged in the rough drawn wire manufacturing apparatus according to the present embodiment.
As shown in FIG. 2, the three-dimensional object 70 is arranged in the space formed between the groove portion (that is, the mold) of the wheel 162 of the casting machine 16 and the belt 164.

The molten copper 110 poured from the hot water pouring nozzle 14 of the tundish 10 is poured into the space between the groove of the wheel 162 and the belt 164. Here, the tip of the pouring nozzle 14 is arranged above the position of the groove portion of the wheel 162 and the hot water surface 110a of the molten copper 110 poured into the belt 164 in the casting machine 16.

The three-dimensional object 70 will be described by applying it to an example in which a ceramic ball is used.
Specifically, the outer shape of the three-dimensional object 70 is formed into, for example, a spherical shape or an elliptical shape. That is, the three-dimensional object 70 has an outer shape whose outer surface (surface) is curved toward the outside. Ceramic is used as the material of the three-dimensional object 70. That is, it is desirable that a material that floats with respect to the molten copper 110 is used as the three-dimensional object 70. Specifically, it is desirable to use a material having a density equal to or lower than the density of molten copper 110. For example, it is desirable that the material has a density of 3 g or less per cubic centimeter. The three-dimensional object 70 may use the same material as the pouring nozzle 14.

Further, as the three-dimensional object 70, a material having heat resistance is used. Specifically, it is desirable to use a material having a melting point higher than that of copper. That is, when the molten copper 110 is poured between the groove of the wheel 162 and the belt 164, it is desirable that the three-dimensional object 70 does not melt or deform even if it comes into contact with the poured molten copper 110. Specifically, it is desirable that melting or deformation does not occur even when the melting point of copper is 1085 ° C. Further, when the temperature of the molten copper 110 is higher than the melting point of copper, it is desirable that the temperature is higher than the temperature of the molten copper 110. The melting point of the three-dimensional object 70 is preferably 1500 ° C. or higher, for example.

The size of the three-dimensional object 70 is a size that fits into the space formed by the groove portion of the wheel 162 and the belt 164, and the molten copper 110 flows between the three-dimensional object 70 and the groove portion of the wheel 162 and the wall surface of the belt 164. It is desirable that it is formed in a size with a gap. For example, when the distance between the groove of the wheel 162 and the wall surface of the belt 164 is about 44 mm, it is preferably about 40 mm. Further, it is desirable that the size of the three-dimensional object 70 is formed to be larger than the size of the opening of the pouring nozzle 14.

For example, when the size of the opening of the pouring nozzle 14 is 13 mm × 30 mm, it is desirable that the diameter of the three-dimensional object 70 is formed to be, for example, 30 mm or more.
[2. Action]
As shown in FIG. 1, the manufacturing process of the copper roughing wire 130 by the roughing wire manufacturing apparatus 1 is continuously performed as a series of steps. The series of steps of the copper roughing wire 130 referred to here includes, for example, a melting step, a tundish storage step, a molten metal supply step, a casting step, and a continuous rolling step.

The melting step is a step of producing molten copper 110 by melting copper.
Specifically, in the melting step, copper as a raw material is charged into the furnace body of the melting furnace 2. The charged copper heats the furnace body by a burner provided in the heated melting furnace 2. As a result, molten copper 110 is continuously produced.

The molten copper 110 produced in the melting step is transferred to the holding furnace 6 through the upper gutter 4 in a state of being held at a predetermined temperature.
Next, in the tundish storage step, the molten copper 110 produced in the melting step is stored in the tundish 10.

The molten copper 110 transferred to the holding furnace 6 is transferred to the tundish 10 via the lower gutter 8. The molten copper 110 transferred to the tundish 10 via the lower gutter 8 is temporarily stored in the tundish 10.

A metal element such as tin may be added to the molten copper 110 between the upper gutter 4 and the tundish 10. Examples of the metal element (alloy element) added to the molten copper 110 include tin (Sn), indium (In), magnesium (Mg), aluminum (Al), titanium (Ti), berylium (Be), and zirconium ( Zr), cerium (Ce), manganese (Mn), silicon (Si), yttrium (Y) and the like. At least one of these metallic elements is added to the molten copper 110.

Next, in the molten metal supply step, the molten metal pouring nozzle 14 pours and supplies the molten metal made of molten copper 110 temporarily stored in the pot 12 to the casting machine 16. Specifically, the molten copper 110 that has flowed out from the tundish 10 through the pouring nozzle 14 is poured into the space formed between the groove of the wheel 162 and the belt 164 in the casting machine 16.

Next, the molten copper 110 poured into the casting machine 16 in the molten copper supply step is determined in advance in the space formed between the groove of the wheel 162 and the belt 164 in the casting machine 16 in the induction step. It is guided in the induction direction Dg which is the direction.

Next, in the casting step, the casting machine 16 orbits the belt 164 while making contact with a part of the outer peripheral surface of the wheel 162. At this time, the wheel 162 and the belt 164 are cooled by the cooling water. As the wheel 162 and the belt 164 are cooled by the cooling water, as shown in FIG. 2, the solid layer 220, which is a layer in which the molten copper 110 is gradually solidified and solidified, is formed. Then, the solid layer 220 is continuously cast as the copper casting material 120. Here, the region where the molten copper 110 solidifies due to the space between the groove portion of the wheel 162 and the belt 164 is hereinafter also referred to as a solidification region As.

Next, in the continuous rolling step, the continuous rolling apparatus 18 continuously rolls the copper casting material 120 transferred from the casting machine 16 while keeping it in a predetermined temperature range. As a result, the copper rough drawn wire 130 having a predetermined outer diameter is formed. The molded copper rough drawn wire 130 is wound by the coiler 20. The copper roughing wire 130 is manufactured by the above steps.

The manufactured copper rough drawn wire 130 is further subjected to core wire processing and rolling processing to reduce the outer diameter, and further heat-treated as necessary to form a conducting wire for application to a conductor such as an electric wire. May be done.

The melting step, the tundish storage step, the molten metal supply step, the casting step, and the continuous rolling step, which constitute the series of steps of the copper roughing wire 130 shown above, are not limited to the above-described embodiment.

<Details of induction process>
Here, the details of the induction process are as follows.
As shown in FIG. 2, the molten copper 110 is poured between the groove of the wheel 162 and the belt 164. The molten copper 110 poured from the pouring nozzle 14 toward the three-dimensional object 70 collides with the three-dimensional object 70 near the molten metal surface 110a of the poured molten copper 110. Here, the position where the molten copper 110 is poured from the pouring nozzle 14 into the three-dimensional object 70, for example, the region where the molten copper 110 collides with the three-dimensional object 70 is also referred to as a pouring region Ap. In a strict sense, the pouring region Ap is not limited to the region where the molten copper 110 poured from the pouring nozzle 14 collides with the three-dimensional object 70. For example, the pouring region Ap may include a region near the position where the molten copper 110 poured from the pouring nozzle 14 collides with the three-dimensional object 70. Further, in a strict sense, it is not necessary for the poured molten copper 110 to collide with the pouring region Ap.

At least a part of the molten copper 110 poured into the pouring region Ap of the three-dimensional object 70 is guided to flow in the guiding direction Dg. The induction direction Dg is a direction different from the direction toward the solidified region As of the molten copper 110. In other words, at least a part of the molten copper 110 poured from the pouring nozzle 14 toward the three-dimensional object 70 is in a direction different from the direction in which the molten copper 110 is directed toward the solidification region As due to the three-dimensional object 70. It is guided in a certain guidance direction Dg.

Specifically, at least a part of the molten copper 110 poured into the pouring region Ap of the three-dimensional object 70 flows on the surface of the three-dimensional object 70. The molten copper 110 flowing on the surface of the three-dimensional object 70 flows along the surface of the three-dimensional object 70 due to the Coanda effect. That is, the induction direction Dg is, for example, the direction along the surface of the three-dimensional object 70 through which the molten copper 110 flows due to this Coanda effect. Further, the induction direction Dg is, for example, a direction in which the molten copper 110 flows along the surface of the three-dimensional object 70 toward the tangential direction of the three-dimensional object 70 at the contact point where the molten copper 110 is poured into the three-dimensional object 70. You may. That is, the molten copper 110 is guided in a direction different from the direction from the contact point toward the center of the three-dimensional object 70. In other words, the three-dimensional object 70 is located between the position where the molten copper 110 is poured from the pouring nozzle 14 and the solidification region As. Therefore, the molten copper 110 is guided in the direction from the contact point toward the center of the three-dimensional object 70, that is, in a direction different from the solidification region As side.

Further, the flow of the molten copper 110 poured toward the three-dimensional object 70 collides with the pouring region Ap of the three-dimensional object 70, so that flows toward a plurality of different induction directions Dg are generated. Then, the molten copper 110 flowing toward the first induction direction Dg1 and the second induction direction Dg2, which are the induction directions Dg facing the opposite sides, collide with each other in the collision region Ac. The collision region Ac referred to here may be, for example, a region near a position opposite to the pouring region Ap with respect to the center of the three-dimensional object 70. As shown in FIG. 2, the collision region Ac does not need to be on the opposite side of the pouring region Ap in a strict sense with respect to the center of the three-dimensional object 70.

That is, in the pouring region Ap near the molten metal surface 110a of the molten copper 110 that has been poured, the molten copper 110 collides with the three-dimensional object 70, and the force of the molten copper 110 in the pouring direction is weakened. Further, when the molten copper 110 collides with the three-dimensional object 70, the molten copper 110 is guided to the guiding direction Dg, which is a direction different from the direction in which the molten copper 110 is poured from the pouring nozzle 14 toward the three-dimensional object 70. Further, the flow of the molten copper 110 flowing in the first lead direction Dg1 and the second lead direction Dg2, which are different lead directions Dg, is on the surface of the three-dimensional object 70 with respect to the center of the three-dimensional object 70 with respect to the pouring region Ap. And collide with each other in the collision region Ac on the opposite side. As a result, the momentum of the molten copper 110 flowing along the surface of the three-dimensional object 70 is offset and weakened.

Further, even if the center position of the three-dimensional object 70 deviates from the position of the molten copper 110 poured from the pouring nozzle 14, a force is applied in the direction in which the flow of the molten copper 110 deviates from the spherical three-dimensional object 70. Join. As a result, the three-dimensional object 70 moves so as to follow the direction in which the flow of the molten copper 110 deviates.

The molten copper 110 corresponds to an example of a molten metal. Further, the pouring nozzle 14 corresponds to an example of the configuration as a molten metal supply unit, the casting machine 16 corresponds to an example of the configuration as a casting portion, and the three-dimensional object 70 corresponds to an example of the configuration as an induction portion and an induction member. do.

[3. effect]
According to the embodiment described in detail above, the following effects are obtained.
(1) According to the present embodiment, it becomes easy to suppress the formation of BH defects in the copper rough drawn wire 130. The BH here is an abbreviation for blowhole, and the BH defect is an abbreviation for blowhole defect. Further, the blowhole defect is a linear defect existing in a cross section (cross section) perpendicular to the longitudinal direction of the copper rough drawn wire 130.

FIG. 3 is a schematic cross-sectional view showing pouring of molten copper in a rough drawn wire manufacturing apparatus in a state where a three-dimensional object is not arranged. Further, FIG. 4 is a diagram showing the relationship between the average value of the distances from the surface of the rough line to the upper end of the BH defects and the total number of BH defects.

As shown in FIG. 3, in the molten metal supply process, when the three-dimensional object 70 is not arranged between the groove portion (that is, the mold) of the wheel 162 and the belt 164, the groove portion of the wheel 162 and the belt 164 are separated from each other. When the molten copper 110 is newly poured into the molten copper 110 that has been poured, bubbles B are generated on the molten metal surface 110a of the poured molten copper 110. In the generated bubbles B, the bubbles B enter the solidification region As, which is the region where the molten copper 110 solidifies due to the force of the flow of the molten copper 110 to be poured. In the solidified region As, the molten copper 110 is gradually solidified to form the solid layer 220. Then, the solid layer 220 is continuously cast as the copper casting material 120. At this time, when the bubbles B enter the solidified region As, the bubbles B are taken into the solidified molten copper 110 and a BH defect occurs.

Specifically, in the molten metal supply process, a plurality of copper rough drawn wires 130 are manufactured in a state where the three-dimensional object 70 is not arranged between the groove portion of the wheel 162 and the belt 164, and the plurality of manufactured copper rough drawn wires are manufactured. At 130, the total number of BH defects (pieces) and the average value of the distances to the upper ends of the BH defects (μm) were measured. The average value of the distance to the upper end of the BH defect referred to here is one or more existing in the cross section of the copper rough drawn wire 130 when the cross section (cross section) perpendicular to the longitudinal direction is observed. For each of the BH defects, the shortest distance from the copper rough wire 130 to the upper end of the BH defect is measured, and the measured shortest distance is averaged. FIG. 4 shows a BH defect existing in each of the six cross-sections of the rough-drawing wire 130 manufactured by using the rough-drawing wire manufacturing apparatus shown in FIG. The relationship between the total number of BH defects (total number of BH defects) and the average value of the distances to the upper ends of the BH defects is shown. As shown in FIG. 4, when the rough drawn wire manufacturing apparatus shown in FIG. 3 is used, the upper end of the BH defect is located at a position more than 400 μm from the surface of the copper rough drawn wire 130 toward the center of the copper rough drawn wire 130. Is located.

That is, in the copper rough drawn wire 130 obtained by using the rough drawn wire manufacturing apparatus shown in FIG. 3, in the molten copper 110 poured, the mainstream of the molten copper 110 is solidified rather than the position closer to the molten metal surface 110a of the molten copper 110. Since it is easy to enter the region As, it is considered that the bubble B that has entered the solidified region As becomes a blowhole defect and exists inside the copper rough drawn wire 130.

On the other hand, in the present embodiment, the flow of the molten copper 110 supplied from the pouring nozzle 14 is guided toward the induction direction Dg. Here, the induction direction Dg is a direction different from the direction toward the solidification region As where the molten copper 110 solidifies in the vicinity of the molten metal surface 110a of the poured molten copper 110. According to such a configuration, the momentum of the molten copper 110 flowing in the direction of the solidified region As is reduced, so that the bubbles B can be prevented from entering the solidified region As where the molten copper 110 solidifies. Can be done. As a result, it is possible to suppress the occurrence of blowhole defects caused by the bubbles B that have entered the molten copper 110.

(2) Further, in the present embodiment, the induction direction Dg is a direction along the surface of the three-dimensional object 70 through which the molten copper 110 flows.
According to such a configuration, by flowing the molten copper 110 along the surface of the three-dimensional object 70 in the guiding step, the flow of the molten copper 110 can be more reliably guided in the guiding direction Dg. As a result, it is easier to prevent the bubbles B from entering the solidification region As, which is the region where the molten copper 110 solidifies.

Further, the induction direction Dg is, for example, a direction in which the molten copper 110 flows along the surface of the three-dimensional object 70 toward the tangential direction of the three-dimensional object 70 at the contact point where the molten copper 110 is poured into the three-dimensional object 70. According to such a configuration, the molten copper 110 is guided from the contact point in a direction different from the position toward the center of the three-dimensional object 70, so that the solidified copper 110 is located on the center side of the three-dimensional object 70 when viewed from the contact point. The molten copper 110 can be guided in a direction different from the direction toward the region As.

(3) In the present embodiment, in the induction step, the first induction direction Dg1 and the second induction, which are the molten copper 110 flowing on the surface of the three-dimensional object 70 and are the induction directions Dg facing opposite sides in the pouring region Ap. The molten copper 110 flowing in the direction Dg2 is collided in the collision region Ac near the surface of the three-dimensional object 70.

According to such a configuration, the molten copper 110 flowing toward the first induction direction Dg1 and the second induction direction Dg2, which are the induction directions Dg facing opposite sides, flows along the surface of the three-dimensional object 70 and is a three-dimensional object. The center of 70 can be made to collide with the collision region Ac near the surface opposite to the pouring region Ap. As a result, the momentum of the molten copper 110 entering the solidified region As can be weakened. Therefore, it is easy to prevent the molten copper 110 from entering the solidified region As in a state containing bubbles B.

(4) In the present embodiment, the three-dimensional object 70 is provided with a three-dimensional object 70 having a density lower than that of the molten copper 110 and guiding the molten copper 110 in the guiding direction Dg by flowing the molten copper 110 along the surface.
According to such a configuration, the three-dimensional object 70 can be easily positioned near the molten metal surface 110a of the molten copper 110 of the mold.

(5) In the present embodiment, the melting point of the three-dimensional object 70 is higher than the melting point of the molten copper 110.
According to such a configuration, it is possible to prevent the three-dimensional object 70 from being deformed and melted.

(6) In the present embodiment, the three-dimensional object 70 has a lower density than the molten copper 110. Therefore, it floats on the molten metal surface 110a of the molten copper 110 supplied to the casting machine 16.
According to such a configuration, the three-dimensional object 70 can be held in the vicinity of the molten metal surface 110a of the molten copper 110 by floating.

(7) In the present embodiment, the three-dimensional object 70 has a spherical outer shape.
According to such a configuration, even if the position where the molten copper 110 is poured deviates from the position of the three-dimensional object 70, the spherical three-dimensional object 70 corresponds to the deviation of the position where the molten copper 110 is poured. The position of is moved. Therefore, it becomes easy to hold the three-dimensional object 70 at the position where the molten copper 110 is poured. Therefore, it is not necessary to provide a mechanism for holding the position of the three-dimensional object 70 at the position where the molten copper 110 is poured separately from the three-dimensional object 70.

(8) In the rough drawing wire manufacturing apparatus 1 of the present embodiment, the pouring nozzle 14 can be used even if it is not a dipping nozzle for pouring the molten copper 110 with its tip immersed in the molten metal surface 110a of the molten copper 110. .. Therefore, it is not necessary to enter between the groove of the wheel 162 and the belt 164.

Further, the tip portion of the pouring nozzle 14 can be separated from the molten metal surface 110a of the molten copper 110. Therefore, it can be visually confirmed from the lateral direction, that is, the direction along the rotation axis of the wheel 162 of the casting machine 16. As a result, it is possible to visually confirm the status such as whether or not the molten copper 110 is being poured from the tip of the pouring nozzle 14, which gives a sense of security to the operator or the like who operates the rough drawn wire manufacturing apparatus 1. be able to.

(9) In the rough drawn wire manufacturing apparatus 1 of the present embodiment, it is possible to prevent the bubbles B from reaching the solidified region As. Here, in the case of casting of oxygen-free copper, hypoxic copper or an alloy obtained by adding a trace element to these, solidification becomes even faster than that of ordinary copper. Even in such a case, by suppressing the arrival of the bubble B to the solidified region As, it becomes easy to suppress the occurrence of the BH defect.

(10) Further, solidification can be delayed by adjusting the thickness of the release agent provided on the groove surface of the wheel 162 when casting the copper casting material 120, the temperature of the cooling water, etc., and relaxing the cooling. Conceivable. However, even if the solidification is delayed, the bubbles B are taken into the copper casting material 120 when the solidification starts from the surface. BH defects are generated by the bubbles B taken into the copper casting material 120. According to the rough drawn wire manufacturing apparatus 1 of the present embodiment, the BH defect is easily suppressed by preventing the bubbles B from reaching the solidified region As, which is the position where solidification from the surface has started.

[4. Modification example]
Although the embodiments of the present disclosure have been described above, the present disclosure is not limited to the above-described embodiments, and can be implemented in various modifications.

(1) In the above embodiment, the method of the continuous casting and rolling apparatus of the roughing wire manufacturing apparatus 1 is a belt & wheel system. However, the method of the continuous casting and rolling apparatus of the rough drawing wire manufacturing apparatus 1 is not limited to the belt & wheel system. For example, the method of the continuous casting and rolling apparatus of the rough drawn wire manufacturing apparatus 1 may be various methods such as a double belt system.

(2) As the raw material for copper used in the above embodiment, electrolytic copper composed of pure copper such as tough pitch copper, oxygen-free copper, and high-purity copper may be used. Further, in the above embodiment, it has been described by applying it to an example in which the raw material of the rough drawn wire manufactured by the rough drawn wire manufacturing apparatus 1 is copper. However, the raw material of the rough drawn wire is not limited to copper, and may be various metals such as aluminum. That is, the rough drawn wire to be manufactured is not limited to the copper rough drawn wire 130, and may be a rough drawn wire of various metals. That is, a molten metal may be used instead of the molten copper 110 in the present embodiment.

(3) In the above embodiment, an example in which the three-dimensional object 70 is arranged in the space formed by the groove portion of the wheel 162 and the belt 164 has been described.
However, the shape of the three-dimensional object 70 arranged in the space formed by the groove portion of the wheel 162 and the belt 164 may be various three-dimensional shapes such as an ellipsoid, a cube, and a rectangular parallelepiped.

Further, the three-dimensional object 70 is not limited to the one formed of ceramic. For example, it may be a carbon ball made of carbon. Carbon balls are more resistant to thermal shock than ceramic balls. That is, carbon is less likely to break than ceramic due to sudden temperature changes when cooled or heated. Therefore, it becomes easy to prevent the broken three-dimensional object 70 from being mixed in the copper rough drawn wire 130. Further, in the case of carbon balls, it is not necessary to preheat the three-dimensional object 70 to near the temperature inside the casting machine 16 before arranging the three-dimensional object 70.

(4) In the above embodiment, the density of the three-dimensional object 70 is equal to or less than the density of the molten copper 110. Therefore, the three-dimensional object 70 floats on the molten metal surface 110a of the molten copper 110. Further, since the three-dimensional object 70 is formed in a spherical shape, the position follows according to the deviation of the molten copper 110 to be poured. As a result, the three-dimensional object 70 can be held near the position where the molten copper 110 is poured.

However, the configuration for holding the three-dimensional object 70 at the position where the molten copper 110 is poured is not limited to such a configuration. For example, it may have a holding portion for holding the position between the pouring nozzle 14 and the three-dimensional object 70, and the holding portion may be configured to hold the position of the three-dimensional object 70.

(5) In the above embodiment, the direction of the molten copper 110 to be poured is guided by the three-dimensional object 70. However, the one that induces the molten copper 110 to be poured is not limited to the one due to the three-dimensional object 70, and the molten copper 110 to be poured is directed in a direction different from the direction toward the solidification region As. It may be guided by a member having a mesh or the like. The member may be arranged so as to be held at a position where the molten copper 110 is poured.

(6) A plurality of functions possessed by one component in the above embodiment may be realized by a plurality of components, or one function possessed by one component may be realized by a plurality of components. .. Further, a plurality of functions possessed by the plurality of components may be realized by one component, or one function realized by the plurality of components may be realized by one component. Further, a part of the configuration of the above embodiment may be omitted. In addition, at least a part of the configuration of the above embodiment may be added or replaced with the configuration of the other above embodiment.

1 ... rough rolling wire manufacturing equipment, 2 ... melting furnace, 4 ... upper gutter, 6 ... holding furnace, 8 ... lower gutter, 10 ... tundish, 12 ... pot, 14 ... pouring nozzle, 16 ... casting machine, 18 ... continuous Rolling equipment, 20 ... coiler, 70 ... three-dimensional object, 110 ... molten copper, 110a ... hot water surface, 120 ... copper casting material, 130 ... copper roughing wire, 162 ... wheel, 164 ... belt, 220 ... solid layer, Ac ... collision Region, Ap ... pouring region, As ... solidification region, B ... bubble, Dg ... induction direction, Dg1 ... first induction direction, Dg2 ... second induction direction.

Claims (7)

The molten metal supply process that supplies the molten metal from the nozzle to the mold,
A casting step of solidifying the molten metal supplied to the mold by the molten metal supply step to produce a casting material, and a casting step of producing a casting material.
A step between the molten metal supply step and the casting step, in which a part of the metal molten metal supplied from the nozzle is solidified on the surface of the metal molten metal supplied to the mold. A guidance process that guides in a direction different from the direction toward the solidification region that becomes solidified,
A rough drawing wire manufacturing method. The rough drawn wire manufacturing method according to claim 1.
In the guiding step, a rough drawing wire manufacturing method in which the molten metal is guided in the guiding direction by the Coanda effect on the molten metal surface. The rough wire manufacturing method according to claim 1 or 2.
In the induction step,
A method for producing a rough drawn wire, in which the molten metal is guided in the guiding direction by flowing along the surface of the guiding member. The rough drawn wire manufacturing method according to claim 3.
In the induction step,
A method for producing a rough drawn wire, wherein the molten metal flowing on the surface of the guiding member collides with the molten metal flowing in different directions on the surface of the guiding member. A molten metal supply unit having a nozzle for supplying molten metal to a mold,
A casting unit that solidifies the metal molten metal supplied to the mold by the molten metal supply unit to produce a casting material, and a casting unit.
On the surface of the molten metal supplied to the mold, which is a portion between the molten metal supply section and the casting section, a part of the molten metal supplied from the nozzle is solidified. An induction part that guides in a guidance direction different from the direction toward the solidification region that becomes solidified,
Roughing wire manufacturing equipment. The rough drawn wire manufacturing apparatus according to claim 5.
The guiding portion is a rough drawing wire manufacturing apparatus that guides the molten metal in the guiding direction by the Coanda effect on the molten metal surface. The rough wire manufacturing apparatus according to claim 5 or 6.
In the guidance part,
A rough wire manufacturing apparatus having a density lower than that of the molten metal and provided with an guiding member that guides the molten metal in the guiding direction by flowing the molten metal along the surface.

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