JP2007083254A - Wire rod, its manufacturing method and its manufacturing apparatus for producing the same - Google Patents

Abstract

<P>PROBLEM TO BE SOLVED: To provide a wire rod capable of being subjected to alloying and having an excellent fine-drawing property, and to provide its manufacturing apparatus and its manufacturing method. <P>SOLUTION: A double crucible 3 made of carbon is provided in the inner part of a quartz tube 2. A round cylindrical outer cylinder 4 is provided in the double crucible 3, and a round cylindrical inner cylinder 5 is provided in the inner part of the outer cylinder 4. Then, eight pieces of holes 9 are formed at even intervasl along the circular peripheral direction on the side wall of the inner cylinder 5. The holes 7 are penetrated through the side wall of the inner cylinder 5 and the end part on the inner surface is lower position than the end part on the outer surface side, and the center axis of the hole 7 is inclined by 45° with respect to the horizontal line. Further, a mold nozzle 8 is provided at the lower part of the double crucible 3, and its inner part is communicated with the inner part of the inner cylinder 5. <P>COPYRIGHT: (C)2007,JPO&INPIT

Description

  The present invention relates to a manufacturing apparatus for a wire made of a metal or an alloy, a manufacturing method for the wire, and a wire manufactured by the manufacturing apparatus or the manufacturing method.

  An ultrafine wire made of copper or a copper alloy is produced by drawing a wire called a rough drawn wire whose diameter is usually 8 mm. Conventionally, there are mainly the following three methods for producing a rough drawn wire.

(1) SCR method The SCR method is a continuous rolling method developed by Southwire, Inc. of the United States, in which electrolytic copper is melted in a shaft furnace and held in a holding furnace, and is a mold composed of cast wheels and steel belts. This is a casting method. The produced cast bar is continuously supplied to the rolling mill as it is, and finally processed into a rough drawn wire having a diameter of 8 mm.

(2) DIP method The DIP method is a method developed by General Electric Company of the United States, in which a copper wire as a core is immersed in molten copper, and the molten copper is adhered and solidified around the copper wire to form copper. This is a method of thickening the line. The thickened copper wire is continuously supplied to a rolling mill as in the SCR method, and finally processed into a rough drawn wire having a diameter of 8 mm. In the DIP method, since a copper wire is rolled in an oxygen-free atmosphere, a copper wire made of oxygen-free copper having an oxygen content of 10 ppm or less can be produced.

(3) Horizontal continuous casting method With horizontal continuous casting method, a mold is directly attached to the melting furnace (holding furnace), and the solidified wire is continuously horizontal in the mold while solidifying the molten copper into the shape of the wire. (See, for example, Patent Documents 1 and 2). According to the horizontal continuous casting method, since casting can be performed with dimensions relatively close to the product size, expensive hot working equipment is not required. Further, alloys that are difficult to hot work such as white and phosphor bronze can be produced.

JP-A-62-101354 JP-A-62-214851

  However, the conventional techniques described above have the following problems. Various factors affect the workability at the time of drawing a rough drawn wire into an extra fine wire, that is, the extra fine wire drawability, but the foreign material breakage in which the wire being processed is broken by the foreign matter present in the rough drawn wire. Is a big problem. Generally, it is considered that a wire breakage occurs when a foreign material having a diameter of 40% or more of the diameter of the wire is present in the wire. If disconnection occurs frequently, the productivity at the time of drawing a very fine wire will be significantly reduced. Therefore, in order to produce an ultrafine wire made of a metal or an alloy, it is necessary that the fine wire drawing property of the rough drawing wire that is the original material is good, and in order to improve the ultra fine wire drawing property of the rough drawing wire, It is necessary to increase the cleanliness of the rough wire.

However, in the SCR method and the DIP method, since there is always a refractory containing SiO ₂ or Al ₂ O ₃ or the like in the route of the molten copper, an oxide such as SiO ₂ or Al ₂ O ₃ is unavoidable in the molten copper. Is mixed and becomes a foreign object. In addition, in the SCR method and the DIP method, since continuous rolling is performed after a cast bar is produced, an attempt is made to produce a rough drawn wire made of various copper alloys by adding an alloy element to molten copper. The strength of the material increases and continuous rolling becomes difficult. For this reason, for example, in the SCR system, a copper alloy material to which a high concentration of additive elements is added is not manufactured.

  On the other hand, a relatively large crucible is also used in the horizontal continuous casting method, and this crucible is usually formed of a mixed sintered body of oxide clay called graphite and graphite. For this reason, the oxide component which forms a crucible will mix in a rough drawing line with wear of a crucible.

  The present invention has been made in view of such problems, and an object of the present invention is to provide a wire that can be alloyed and has excellent ultrafine wire drawing, a manufacturing apparatus thereof, and a manufacturing method thereof.

  The wire rod manufacturing apparatus according to the present invention divides a crucible into a crucible, a first portion in which the raw material is supplied and dissolves the raw material, and a second portion into which the raw material dissolved from the first portion flows. A partition wall, a hole penetrating the partition wall and having an end on the second part side located at a lower position than the end part on the first part side, and the inside thereof communicating with the second part and the dissolved raw material And a mold nozzle for solidifying the wire into the shape of a wire.

  In the present invention, since the melted raw material passes through the holes formed in the partition when moving from the first part to the second part of the crucible, the partition serves as a filter, and foreign substances larger than the holes are removed. It can be removed from the raw material. Moreover, since the edge part of the 2nd part side of a hole exists in a position lower than the edge part of the 1st part side, a hole is downward with respect to the distribution direction of a raw material. For this reason, even if it is a foreign material smaller than a hole, since the buoyancy arises in the foreign material whose specific gravity is smaller than the specific gravity of the melt | dissolved raw material, it cannot pass through a hole and can be removed from a raw material. As a result, the raw material from which foreign matters are removed can be supplied to the second portion, and this raw material can be supplied to the mold nozzle. As a result, it is possible to manufacture a wire with a small amount of foreign matter and excellent fine wire drawing. In addition, since rolling is not performed when manufacturing the wire, an alloy can be used as a raw material.

  Further, the crucible is an outer cylinder, the partition is an inner cylinder disposed inside the outer cylinder, the first portion is a portion between the outer cylinder and the inner cylinder, and the second The portion may be the inside of the inner cylinder, the mold nozzle may be disposed below the crucible, the melted raw material may flow from the upper end portion thereof, and the solidified wire may be drawn from the lower end portion thereof. . By making the structure of the crucible into a double structure comprising an outer cylinder and an inner cylinder, the entire crucible can be made compact and the raw material supplied to the first portion can be efficiently heated. Also, liquid raw material flows in from the upper end of the mold nozzle, this raw material is solidified in the mold nozzle, and the solidified solid wire is drawn out from the lower end of the mold nozzle, thereby continuously solidifying the raw material. Can be made.

  Furthermore, it is preferable that the central axis of the hole is inclined by 10 to 80 ° with respect to the horizontal line. As a result, foreign substances having a specific gravity smaller than that of the raw material can be efficiently removed, and holes can be easily formed in the partition walls.

  Furthermore, the inner diameter of the hole is preferably 0.5 mm or more and less than the thickness of the partition wall. Thereby, a foreign material can be efficiently removed from a raw material. Furthermore, the number of the holes may be eight.

  Furthermore, it is preferable that the distance from the lower end of the partition to the end of the hole on the first part side is 1/10 or less of the height of the partition. As a result, the amount of the raw material remaining in the first portion after the end of casting is reduced, and it is possible to prevent the partition wall from being damaged when the remaining raw material solidifies.

  Furthermore, it is preferable that the crucible, the partition and the mold nozzle are formed of carbon. Thereby, it can prevent that an oxide mixes in a raw material from a crucible, a partition, and a casting_mold | template nozzle.

  The method of manufacturing a wire according to the present invention includes a step of dissolving a raw material in a first part in a crucible, and circulating the dissolved raw material in a downward hole formed in the partition wall from the first part by the partition wall. The method includes a step of flowing into the partitioned second portion and a step of solidifying the raw material flowing into the second portion into the shape of a wire.

  In the present invention, when the melted raw material flows from the first part of the crucible into the second part, it passes through the downward hole formed in the partition wall, so that foreign substances can be removed from the raw material. Moreover, since there is no rolling process, it is also possible to use an alloy as a raw material.

  Further, the crucible is an outer cylinder, the partition is an inner cylinder disposed inside the outer cylinder, the first portion is a portion between the outer cylinder and the inner cylinder, and the second The portion is inside the inner cylinder, and the solidifying step flows the melted raw material from the upper end portion of the mold nozzle into the mold nozzle disposed below the crucible from the second portion; The inflowing raw material may be solidified in the mold nozzle, and the solidified wire may be drawn out from the lower end of the mold nozzle.

  The wire according to the present invention is manufactured by the manufacturing apparatus or the manufacturing method.

  According to the present invention, a foreign material can be removed from a raw material, so that a wire with excellent fine wire drawing can be obtained. Moreover, since no rolling process is involved, the wire can be formed from an alloy.

  Hereinafter, embodiments of the present invention will be specifically described with reference to the accompanying drawings. FIG. 1 is a schematic sectional view showing a small vertical casting machine according to the present embodiment, and FIG. 2 is an exploded perspective view showing a double crucible and a mold nozzle of the small vertical casting machine shown in FIG. 3 is a partially enlarged cross-sectional view showing a part of the inner cylinder of the crucible shown in FIG. 2 and 3, numerical values indicating the dimensions of the respective parts of the double crucible and the mold nozzle are described. However, these numerical values are merely examples, and the present invention is not limited thereto.

  As shown in FIGS. 1 to 3, in a small vertical casting machine 1 which is a wire manufacturing apparatus according to the present embodiment, a cylindrical quartz tube 2 is provided. The quartz tube 2 includes a side plate 2a, a bottom plate 2b, and a top plate 2c, and the inside is hermetically sealed. A circular opening 2d is formed at the center of the bottom plate 2b. In addition, two material insertion ports 2e and 2f are provided at positions separated from each other in the peripheral portion of the top plate 2c.

  A double crucible 3 is provided inside the quartz tube 2. The double crucible 3 is made of carbon, for example. In the double crucible 3, a cylindrical outer cylinder 4 is provided, and a cylindrical inner cylinder 5 is provided inside the outer cylinder 4. The outer cylinder 4 and the inner cylinder 5 are concentrically arranged, and the central axis extends in the vertical direction. The bottoms of the outer cylinder 4 and the inner cylinder 5 are sealed by a bottom plate 6, and the upper parts of the outer cylinder 4 and the inner cylinder 5 are open.

  For example, the bottom plate 6 has a diameter of 100 mm and a thickness of 15 mm. Further, the height of the outer cylinder 4 is 225 mm, the outer diameter is 100 mm, the inner diameter is 84 mm, and therefore the thickness of the side wall is 8 mm. The height of the inner cylinder 5 is 225 mm, the outer diameter is 40 mm, the inner diameter is 28 mm, and therefore the thickness of the side wall is 6 mm. Further, the overall height of the double crucible 3 is 240 mm, and the outer diameter is 100 mm. A circular opening 6 a is formed at the center of the bottom plate 6 and communicates with the inside of the inner cylinder 5. The diameter of the opening 6a is, for example, 22 mm.

  For example, eight holes 7 are formed in the side wall of the inner cylinder 5 at equal intervals along the circumferential direction. The diameter of the hole 7 is 1 mm, for example. The hole 7 penetrates the side wall of the inner cylinder 5, and the end on the inner surface is lower than the end on the outer surface. The distance between the outer surface side end of the inner cylinder 5 of the hole 7 and the lower end of the inner cylinder 5 is 1/10 or less of the height (225 mm) of the inner cylinder 5, for example, 15 mm. The central axis of the hole 7 is inclined by 10 to 80 °, for example, 45 ° with respect to the horizontal line. A point A shown in FIG. 2 indicates an intersection between a virtual straight line (not shown) extending horizontally from the end of the outer surface side of the hole 7 in the radial direction of the inner tube 5 and the outer surface of the outer tube 4. .

  A mold nozzle 8 is provided below the double crucible 3. The mold nozzle 8 is made of carbon, has a cylindrical shape, and its central axis extends in the vertical direction. The outer diameter of the mold nozzle 8 is continuously reduced from the upper end portion toward the lower end portion, and is, for example, 22 mm at the upper end portion and 20 mm at the lower end portion. The inner diameter of the mold nozzle 8 is 8 mm and the height is 130 mm. The upper end portion of the mold nozzle 8 is inserted into a hole 2 d formed in the bottom plate 2 b of the quartz tube 2 and is fitted into an opening 6 a formed in the bottom plate 6 of the double crucible 3. Thereby, the inside of the mold nozzle 8 communicates with the inside of the inner cylinder 5 through the opening 6 a of the bottom plate 6.

  On the other hand, an induction heating furnace 11 is provided around the quartz tube 2. The induction heating furnace 11 heats the double crucible 3 through the quartz tube 2. A rotary pump 12 is provided, and an exhaust port of the rotary pump 12 communicates with the inside of the quartz tube 2. Further, the quartz tube 2 is provided with a valve 13 for introducing an inert gas into the quartz tube 2. Furthermore, a water cooling jacket 14 is provided around the lower half of the mold nozzle 8. The water cooling jacket 14 is in contact with the outer surface of the mold nozzle 8 and cools the lower part of the mold nozzle 8. A pair of pinch rolls 15 is provided below the mold nozzle 8 and the water cooling jacket 14. The pinch roll 15 sandwiches the solidified wire in the mold nozzle 8 and pulls it out from the lower end of the mold nozzle 8.

  Next, the operation of the wire rod manufacturing apparatus according to the present embodiment configured as described above, that is, the wire rod manufacturing method according to the present embodiment will be described with reference to FIGS. First, the inside of the quartz tube 2 is evacuated and evacuated by the rotary pump 12, and then an inert gas such as argon gas or nitrogen gas is introduced into the quartz tube 2 through the valve 13. Thereby, the inside of the quartz tube 2 is made an inert atmosphere.

  And the copper wire 21 as a raw material is supplied between the outer cylinder 4 and the inner cylinder 5 via the material insertion port 2e. At this time, when the raw material is a copper alloy, for example, a copper-silver alloy, the copper wire 21 is supplied from the material insertion port 2e, and the wire made of an alloy element, for example, a silver wire 22 from the material insertion port 2f. Is continuously supplied between the outer cylinder 4 and the inner cylinder 5. On the other hand, the copper wire 21 supplied between the outer cylinder 4 and the inner cylinder 5 is melted by the induction heating furnace 11. Thereby, the molten copper 23 accumulates between the outer cylinder 4 and the inner cylinder 5.

  When the upper surface of the molten copper 23 reaches the height of the end on the outer surface side of the inner cylinder 5 in the hole 7, the molten copper 23 passes through the hole 7 formed in the inner cylinder 5 and the inside of the inner cylinder 5. Flow into. At this time, the inner cylinder 5 serves as a filter, and foreign matters larger than the diameter of the hole 7 cannot pass through the hole 7 but remain between the outer cylinder 4 and the inner cylinder 5. In addition, foreign matter having a specific gravity smaller than the specific gravity of the molten copper 23, such as a foreign matter made of oxide, cannot pass through the downward hole 7 because buoyancy works in the molten copper 23. For this reason, such a foreign substance having a small specific gravity is also left between the outer cylinder 4 and the inner cylinder 5. As a result, clean molten copper 24 from which foreign matter larger than the diameter of the hole 7 and foreign matter having a specific gravity smaller than that of the molten copper 23 is removed is supplied into the inner cylinder 5.

  The clean molten copper 24 supplied to the inside of the inner cylinder 5 flows into the inside of the mold nozzle 8 from the upper end portion of the mold nozzle 8 through the opening 6 a of the bottom plate 6. The molten copper 24 that has flowed in is cooled by the water cooling jacket 14 and solidifies inside the mold nozzle 8 to become a wire having a diameter of, for example, 8 mm. And the pinch roll 15 pulls out this wire from the lower end part (tip part) of the mold nozzle 8. Thereby, the copper wire 25 which concerns on this embodiment is producible. The copper wire 25 is a rough drawn wire that is subjected to wire drawing because it is formed into an ultrafine wire.

  Hereinafter, the reason for the numerical limitation in each constituent requirement of the present invention will be described.

Angle at which the central axis of the hole is inclined with respect to the horizontal line: 10 to 80 °
If the angle is 10 ° or more, a sufficient drop can be formed between both end portions of the hole, and foreign matter having a specific gravity smaller than that of the raw material can be reliably floated against the inflow speed of the raw material. On the other hand, if the angle is set to 80 ° or less, the drilling distance when forming a hole in the partition wall (inner cylinder) can be shortened, and the possibility of damaging the partition wall (inner cylinder) is reduced. Therefore, the angle at which the central axis of the hole is inclined with respect to the horizontal line is preferably 10 to 80 °.

By setting the inner diameter of the hole to 0.5 mm or more, it is possible to reliably prevent the hole from being clogged with foreign substances. When the inner diameter of the hole is less than 0.5 mm, foreign matter may block the hole in the initial stage of the process of dissolving the raw material, and productivity may be lowered in the subsequent processes. On the other hand, by setting the inner diameter of the hole to be equal to or less than the thickness of the partition wall, foreign substances can be efficiently blocked by the inclined surface in the hole. Therefore, the inner diameter of the hole is preferably 0.5 mm or more and not more than the thickness of the partition wall.

Distance from the lower end of the partition wall (inner cylinder) to the outer surface side end of the hole: 1/10 or less of the height of the partition wall The casting is finished at a portion lower than the hole in the space between the outer cylinder and the inner cylinder The molten metal remains later. When there is much this residual molten metal, an inner cylinder may be damaged by the thermal contraction of the residual molten metal accompanying cooling. By setting the distance from the lower end of the partition wall to the end on the outer surface side of the hole to be one tenth or less of the height of the partition wall, the amount of residual molten metal can be reduced and the inner cylinder can be prevented from being damaged. .

  Next, the effect of this embodiment will be described. In this embodiment, the molten copper 23 passes through the hole 7 when moving from between the outer cylinder 4 and the inner cylinder 5 of the double crucible 3 into the inner cylinder 5. Thereby, the foreign material larger than the hole 7 can be removed from the molten copper 23. Further, the hole 7 is directed downward with respect to the flow direction of the molten copper 23 because the end on the inner surface side of the inner cylinder 5 is located at a position lower than the end on the outer surface side. For this reason, foreign matters whose specific gravity is smaller than the specific gravity of the molten copper 23, such as foreign matters made of oxide, cannot pass through the holes 7 even if they are smaller than the holes 7. Can be removed. As a result, clean molten copper 24 from which foreign matter has been removed from the molten copper 23 can be supplied into the inner cylinder 5, and the clean molten copper 24 is solidified in the mold nozzle 8 to obtain a copper wire. 25 can be formed. As a result, the copper wire 25 having a small amount of foreign matter and excellent fine wire drawing can be manufactured.

  In particular, since the central axis of the hole 7 is inclined by 10 to 80 °, for example, 45 ° with respect to the horizontal line, foreign matters having a specific gravity smaller than that of the molten copper 23 can be efficiently removed, and the hole 7 is formed in the inner cylinder 5. It can be formed easily.

  Further, since the double crucible 3 has a double structure including the outer cylinder 4 and the inner cylinder 5, the entire small vertical casting machine 1 can be made compact. Moreover, since the induction heating furnace 11 is arrange | positioned around the outer cylinder 4, and the copper wire 21 which is a raw material is supplied between the outer cylinder 4 and the inner cylinder 5, the copper wire 21 is attached. It can be heated efficiently.

  Furthermore, since the inner diameter of the hole 7 is, for example, 1 mm, 0.5 mm or more, and the thickness of the inner cylinder 5 (6 mm) or less, the hole 7 can be efficiently removed without causing clogging. And it can remove reliably.

  Furthermore, since the distance from the lower end of the inner cylinder 5 to the outer surface end of the hole 7 is 1/10 or less of the height of the inner cylinder 5, the distance between the outer cylinder 4 and the inner cylinder 5 after the end of casting. The amount of the molten copper 23 remaining therebetween is reduced, and the inner cylinder 5 can be prevented from being damaged when the remaining molten copper 23 is solidified.

  Furthermore, since the double crucible 3 and the mold nozzle 8 are made of carbon, no oxide is mixed into the molten copper from the double crucible 3 and the mold nozzle 8.

  Furthermore, according to this embodiment, the diameter of the copper wire 25 can be freely changed by changing the inner diameter of the mold nozzle 8. For this reason, it is not necessary to provide a rolling process in order to manufacture the copper wire 25 like the conventional SCR system and DIP system. Therefore, according to this embodiment, it is easy to produce a wire made of an alloy containing a relatively high concentration of additive elements. Moreover, since it is not necessary to provide rolling equipment, equipment cost is low.

  In addition, in this embodiment, although the example which manufactures a copper wire using a pure copper as a raw material was shown, this invention is not limited to this, You may use another metal or alloy as a raw material. For example, a copper alloy wire may be produced using a copper alloy as a raw material, and an aluminum wire or an aluminum alloy wire may be produced. For example, as described above, by supplying the silver wire 22 together with the copper wire 21 between the outer cylinder 4 and the inner cylinder 5 of the double crucible 3, a wire made of a copper-silver alloy can be manufactured. In addition, the quartz tube 2 may be provided with three or more material insertion ports to manufacture a wire made of a ternary or higher alloy. Furthermore, although it is preferable to provide about eight holes 7 in the inner cylinder 5, it is not necessarily limited to eight.

  Hereinafter, the effect of the embodiment of the present invention will be specifically described in comparison with a comparative example that deviates from the scope of the claims.

(Example 1-1)
In Example 1-1, copper (Cu) is used as a raw material, and a rough drawn wire having a diameter of 8 mm is manufactured using the small vertical casting machine 1 shown in FIGS. 1 to 3. The ultrafine wire drawing property was evaluated. In the small vertical casting machine 1, as in the above-described embodiment of the present invention, the inner diameter of the hole 7 is 1 mm, the angle formed by the center line of the hole and the horizontal line is 45 °, and the thickness of the inner cylinder 5 is 6 mm. did.

  Hereinafter, a method for manufacturing the rough drawn wire according to Example 1-1 will be described. First, a starting rod (not shown) whose composition is the same pure copper as that of the raw material and whose outer diameter is equal to the outer diameter of the mold nozzle 8 is prepared, and its tip is polished to give a new surface. The starting rod was inserted into the mold nozzle 8 from the lower end, and the height of the upper end of the starting rod was matched with the height of the upper end of the mold nozzle 8. Further, an oxygen-free copper rough drawing wire as a raw material was set between the outer cylinder 4 and the inner cylinder 5 of the double crucible 3.

  Next, the inside of the quartz tube 2 was evacuated by the rotary pump 12, and the pressure inside the quartz tube 2 was set to 26.7 Pa (0.2 Torr) or less. The raw material set between the outer cylinder 4 and the inner cylinder 5 was heated by the induction heating furnace 11. After this raw material was dissolved, the rotary pump 12 was stopped, and argon gas was introduced into the quartz tube 2 through the valve 13 to make the inside of the quartz tube 2 an inert atmosphere.

  Then, the molten copper 24 flowing into the inner cylinder 5 was solidified and joined to the upper end surface of the starting rod, and then the starting rod was pulled out by the pinch roll 15 to start casting. The subsequent steps are the same as those in the above-described embodiment. That is, while supplying the copper wire 21 from the material insertion port 2 e between the outer cylinder 4 and the inner cylinder 5, the copper wire 21 is heated and melted by the induction heating furnace 11, and the melted raw material is transferred to the inner cylinder 5. The copper wire 25 was pulled out by the pinch roll 15 while flowing into the inner cylinder 5 through the formed hole 7. At this time, casting was performed at an average casting speed of 100 mm / min by an intermittent method in which the maximum drawing speed of the copper wire 25 was set to 10 mm / second, and the drawing was repeated for 0.5 seconds and stopped for 2.5 seconds.

  Next, an evaluation method of the specimen (copper wire 25) produced in this way will be described. Generally, the drawability of a wire can be evaluated by the amount of wire produced after drawing. In this test example, the test material was drawn to a diameter of 2.6 mm with a class G wire drawing machine, drawn to a diameter of 1.2 mm with a class M wire drawing machine, and the cord size wire drawing. The wire was drawn to a diameter of 0.18 mm using a machine, and the wire was drawn to a diameter of 0.04 mm using an ultrafine wire drawing machine. And wire drawing property was evaluated by the production amount of a wire with a diameter of 0.04 mm. It can be determined that the greater the yield, the better the drawability. The wire drawing process described above was performed three times under the same conditions, and the average value of the output was adopted. The evaluation results are shown in Table 1.

(Example 1-2)
In Example 1-2, a copper-silver alloy (Cu-1.0% Ag) containing 1.0% by mass of silver and the balance being copper is used as a raw material, as shown in FIGS. Using the small vertical casting machine 1, a rough drawn wire having a diameter of 8 mm was manufactured, and the ultrafine wire drawing property of the rough drawn wire was evaluated. That is, as a raw material, the copper wire 21 is supplied between the outer cylinder 4 and the inner cylinder 5 via the material insertion port 2e, and the silver wire 22 is supplied to the material insertion port 2f at a constant ratio with respect to the copper wire 21. Between the outer cylinder 4 and the inner cylinder 5. Moreover, the starting rod which consists of the same copper-silver alloy (Cu-1.0% Ag) as a raw material was used as a starting rod. Production methods and evaluation methods other than those described above in Example 1-2 are the same as in Example 1-1 described above. The evaluation results are shown in Table 1.

(Example 1-3)
In Example 1-3, a copper-tin alloy (Cu-0.7% Sn) containing 0.7% by mass of tin as a raw material and the balance being copper is used, and is shown in FIGS. Using the small vertical casting machine 1, a rough drawn wire having a diameter of 8 mm was manufactured, and the ultrafine wire drawing property of the rough drawn wire was evaluated. That is, as a raw material, the copper wire 21 is supplied between the outer tube 4 and the inner tube 5 from the material insertion port 2e, and a tin wire (not shown) is inserted into the copper wire 21 at a constant rate. It was supplied between the outer cylinder 4 and the inner cylinder 5 from the mouth 2f. Moreover, the starting rod which consists of the same copper-tin alloy (Cu-0.7% Sn) as a raw material was used as a starting rod. Production methods and evaluation methods other than those described above in Example 1-3 are the same as in Example 1-1. The evaluation results are shown in Table 1.

(Comparative Example 1-1)
FIG. 4 is an exploded perspective view showing a crucible and a mold nozzle of a small vertical casting machine used in this comparative example. As shown in FIG. 4, the crucible 31 used in this comparative example is different from the double crucible 3 shown in FIG. 2 in that the inner cylinder 5 (see FIG. 2) is not provided. Therefore, the raw material supplied and melted in the outer cylinder 4 flows into the mold nozzle 8 as it is. The configuration of the mold nozzle 8 shown in FIG. 4 is the same as that of the mold nozzle 8 shown in FIG.

  In Comparative Example 1-1, copper (Cu) was used as a raw material, and a rough drawn wire having a diameter of 8 mm was manufactured using a small vertical casting machine having a crucible 31 shown in FIG. The ultrafine wire drawing property of the drawn wire was evaluated. In the evaluation of ultrafine wire drawing, wire was drawn using a cord size wire drawing machine until the diameter reached 0.18 mm. Production methods and evaluation methods other than those described above in Comparative Example 1-1 are the same as in Example 1-1. The evaluation results are shown in Table 1.

(Comparative Example 1-2)
In this comparative example 1-2, the small vertical type | mold provided with the crucible 31 shown in FIG. 4 using the copper-silver alloy (Cu-1.0% Ag) containing 1.0 mass% silver as a raw material. A roughing wire having a diameter of 8 mm was produced using a casting machine, and the ultrafine wire drawing property of the roughing wire was evaluated. In the evaluation of ultrafine wire drawing, wire was drawn using a cord size wire drawing machine until the diameter reached 0.18 mm. Production methods and evaluation methods other than those described above in Comparative Example 1-2 are the same as in Example 1-2 described above. The evaluation results are shown in Table 1.

(Comparative Example 1-3)
In this comparative example 1-3, the small vertical type | mold provided with the crucible 31 shown in FIG. 4 using the copper- tin alloy (Cu-0.7% Sn) containing 0.7 mass% tin as a raw material. A roughing wire having a diameter of 8 mm was produced using a casting machine, and the ultrafine wire drawing property of the roughing wire was evaluated. In the evaluation of ultrafine wire drawing, wire was drawn using a cord size wire drawing machine until the diameter reached 0.18 mm. Production methods and evaluation methods other than those described above in Comparative Example 1-3 are the same as in Example 1-3. The evaluation results are shown in Table 1. In addition, “double” described in the column of “crucible” in Table 1 indicates that a double crucible 3 as shown in FIG. 2 was used, and “normal” means a conventional as shown in FIG. The single crucible 31 is used. Moreover, the value of “Production amount” shown in Table 1 is an average value of three measurement values.

  As shown in Table 1, since Examples 1-1 to 1-3 used a manufacturing apparatus equipped with a double crucible as a manufacturing apparatus for the wire, foreign substances could be effectively removed from the molten copper. . As a result, the production amount of the wire having a diameter of 0.04 mm was 24 kg or more, and the ultrafine wire drawing was high. Moreover, not only when using pure copper as a raw material shown in Example 1-1, but also when using a copper alloy as a raw material as shown in Examples 1-2 and 1-3, excellent ultrafine wire drawing properties Could get.

  On the other hand, Comparative Examples 1-1 to 1-3 shown in Table 1 can remove foreign matters from the molten copper because a conventional manufacturing apparatus including a single crucible is used as a manufacturing apparatus for the wire. The production amount of the wire having a diameter of 0.04 mm was less than 1.0 kg, and the ultrafine wire drawing property was low.

  In Example 2, the effect of the hole angle on the drawability was investigated. A plurality of double crucibles having different hole angles are produced, and a rough drawn wire is produced by using the double crucible in the same manner as in (Example 1-1) of "Example 1" described above. Then, the ultrafine wire drawing property was evaluated. The evaluation results are shown in Table 2. Note that the “production amount” shown in Table 2 is the production amount when the rough drawn wire is drawn into a wire having a diameter of 0.04 mm, as in Table 1, and is an average value of n = 3. is there.

  As shown in Examples 2-5 to 2-7 in Table 2, when a double crucible having an angle of the hole, that is, an angle between the center line of the hole and the horizontal line of 10 to 80 °, is used, The amount of the rough drawn wire produced was 23 to 25 kg, and the ultrafine wire drawing property was good. On the other hand, in Example 2-4 using a double crucible with a hole angle of 5 °, the output was 1.2 kg, which was smaller than Examples 2-5 to 2-7. . This is presumably because the direction in which the center line of the hole extends is nearly horizontal, and foreign matters having a size smaller than that of the hole and a specific gravity smaller than that of the molten copper could not be sufficiently removed. However, Example 2-4 produced a larger amount than Comparative Examples 1-1 to 1-3 shown in Table 1, and a certain effect by using a double crucible was recognized. Further, in Example 2-8, an attempt was made to form a hole with an angle of 82 ° in the inner cylinder of the double crucible, but the drilling distance became extremely long, and the inner cylinder was removed in the process of forming the hole. Since there was a possibility of breakage, the formation of holes was abandoned.

  In Example 3, the influence of the inner diameter of the hole on the drawability was investigated. A plurality of double crucibles having different inner diameters of the holes are produced, and a rough drawn wire is produced by using the double crucible in the same manner as (Example 1-1) in the above-mentioned “Example 1”. Then, the ultrafine wire drawing property was evaluated. The hole angle was 45 °. The evaluation results are shown in Table 3. The “production amount” shown in Table 3 is the production amount when the rough drawn wire is drawn into a wire having a diameter of 0.04 mm as in Table 1, and is an average value of n = 3.

  As shown in Table 3, in Example 3-9 in which the inner diameter of the hole was 0.3 mm, the hole was clogged with foreign matters generated at the initial stage of dissolution, and the productivity was lowered. In Example 3-10 in which the inner diameter of the hole was 0.5 mm, the production amount was 25 kg and a good result was obtained. In Example 3-11 in which the inner diameter of the hole was 8.0 mm, the output was 1.0 kg, which is better than Comparative Examples 1-1 to 1-3 shown in Table 1, but Example 3 The result was inferior to -10. This is thought to be because the inner diameter of the hole was too large and foreign matter could not be removed sufficiently.

1 is a schematic cross-sectional view showing a small vertical casting machine according to an embodiment of the present invention. FIG. 2 is an exploded perspective view showing a double crucible and a mold nozzle of the small vertical casting machine shown in FIG. 1. It is a partially expanded sectional view which shows a part of inner cylinder of the crucible shown in FIG. It is a disassembled perspective view which shows the crucible and mold nozzle of the small vertical casting machine used in Comparative Examples 1-1 thru | or 1-3.

Explanation of symbols

DESCRIPTION OF SYMBOLS 1; Small vertical caster 2; Quartz tube 2a; Side plate 2b; Bottom plate 2c; Top plate 2d; Opening 2e, 2f; Material insertion port 3; Double crucible 4; Outer tube 5; Inner tube 6; Opening 7; Hole 8; Mold nozzle 11; Induction heating furnace 12; Rotary pump 13; Valve 14; Water cooling jacket 15; Pinch roll 21; Copper wire 22; Silver wire 23 and 24; Molten copper 25; Copper wire 31;

Claims (16)

A crucible, a partition that is divided into a crucible, a first portion in which the raw material is supplied and dissolves the raw material, and a second portion into which the raw material dissolved from the first portion flows, A hole in which the end portion on the two-part side is lower than the end portion on the first-part side, and a mold nozzle whose inside communicates with the second part and solidifies the dissolved raw material into the shape of a wire; The manufacturing apparatus of the wire characterized by having. The crucible is an outer cylinder, the partition is an inner cylinder disposed inside the outer cylinder, the first part is a part between the outer cylinder and the inner cylinder, and the second part is It is the inside of the inner cylinder, the mold nozzle is arranged below the crucible, the melted raw material flows in from the upper end portion thereof, and the solidified wire is drawn out from the lower end portion thereof. The apparatus for manufacturing a wire according to claim 1. The wire rod manufacturing apparatus according to claim 1 or 2, wherein a central axis of the hole is inclined by 10 to 80 degrees with respect to a horizontal line. The wire manufacturing apparatus according to any one of claims 1 to 3, wherein an inner diameter of the hole is 0.5 mm or more and less than a thickness of the partition wall. The wire manufacturing apparatus according to any one of claims 1 to 4, wherein the number of the holes is eight. The distance from the lower end of the partition to the end on the first part side of the hole is 1/10 or less of the height of the partition, according to any one of claims 1 to 5. The manufacturing apparatus of wire rod as described. The wire crucible manufacturing apparatus according to any one of claims 1 to 6, wherein the crucible, the partition wall, and the mold nozzle are formed of carbon. The wire manufacturing apparatus according to any one of claims 1 to 7, wherein copper or a copper alloy is used as the raw material. The wire manufacturing apparatus according to any one of claims 1 to 7, wherein aluminum or an aluminum alloy is used as the raw material. A step of dissolving the raw material in the first portion in the crucible, and a step of flowing the dissolved raw material through a downward hole formed in the partition wall and flowing from the first portion into the second portion partitioned by the partition wall And a step of solidifying the raw material flowing into the second portion into the shape of the wire. The crucible is an outer cylinder, the partition is an inner cylinder disposed inside the outer cylinder, the first part is a part between the outer cylinder and the inner cylinder, and the second part is The solidifying step, which is inside the inner cylinder, includes the step of flowing the melted raw material from the upper end of the mold nozzle into the mold nozzle disposed below the crucible from the second portion, and the inflow The method for producing a wire according to claim 10, further comprising: solidifying the raw material in the mold nozzle; and drawing the solidified wire from a lower end portion of the mold nozzle. The method for manufacturing a wire according to claim 10 or 11, wherein a central axis of the hole is inclined by 10 to 80 degrees with respect to a horizontal line. The method for manufacturing a wire according to any one of claims 10 to 12, wherein copper or a copper alloy is used as the raw material. The method for manufacturing a wire according to any one of claims 10 to 12, wherein aluminum or an aluminum alloy is used as the raw material. A wire rod manufactured by the manufacturing apparatus according to any one of claims 1 to 9. A wire manufactured by the manufacturing method according to claim 10.

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