JPH05329581A - Manufacture of metallic wire rod - Google Patents

Abstract

PURPOSE:To provide the method for mass-producing the metallic wire rod of high quality by a small-sized device. CONSTITUTION:In the process for curving a running metallic strip body 1 in the breadthwise direction and forming successively and continuously the strip body in a cylindrical shape, a molten metal 8 is supplied into a curved formed body 6 of the metallic strip body 1 and cooled and solidified, a composite bar stock 13 obtd. by internally chilling the solidified body with the metallic strip body 1 is formed, and subsequently, stretching is performed to this composite bar stock 13. In such a way, a mold is constituted of the same material over the whole periphery, the solidified body and the mold are not rubbed against each other, and after the metallic strip body 1 internally chilling the solidified body is cooled forcedly from the outside periphery, a wire rod is formed by stretching the strip body 1 as it is, therefore the wire rod of high quality can be manufactured efficiently. Moreover, the running metallic strip body 1 worked with roll forming machines 4, 5 is used as the mold to reduce the size of the device.

Description

Detailed Description of the Invention

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a method for mass-producing high-quality metal filaments with a compact device.

[0002]

2. Description of the Related Art As a method for producing a metal filament, a belt wheel type continuous casting method, a twin belt type continuous casting method,
The auto-kump type continuous casting method in which a graphite mold is placed on the molten metal and the ingot is pulled upward, and the dip forming casting method in which the molten metal is solidified around the seed line have been put into practical use. When the metal linear body is a composite material, a composite billet method has been used in which a metal pipe is filled with a dissimilar metal rod material to form a composite billet, and the composite billet is stretched.

[0003]

However, in the belt wheel type continuous casting method, in the ingot portion located at the boundary portion between the steel belt and the copper wheel forming the mold, and in the twin belt type continuous casting method, Defects are likely to occur at the ingot portions located at the boundary between each of the two steel belts and the two cast iron dam blocks that make up the mold, and in the auto-kump type continuous casting method, the graphite mold is Since it is fixed, there is a problem that the ingot and the mold are rubbed against each other and a defect is likely to occur in the ingot. Further, the dip-forming casting method has various problems that productivity is low because it cannot be cooled strongly, and that all of the above-mentioned casting apparatuses are large and occupy a large space and the equipment cost is high. Further, when the composite metal linear body is manufactured by the composite billet method, since pipes and rods are prepared in advance, the productivity is poor and a long product cannot be manufactured.

[0004]

SUMMARY OF THE INVENTION The present invention has been made as a result of intensive research based on a new idea in view of such a situation, and an object thereof is to provide a relatively small device, It is to provide a manufacturing method capable of mass-producing high-quality filaments. That is, the present invention, in the process of curving the running metal strip in the width direction and sequentially and continuously forming a tubular shape,
The molten metal is supplied into the curved body of the metal strip, and the solid is cooled and solidified to form a composite rod in which the solidified body is cast in the metal strip, and then the composite rod is subjected to a stretching process. It is a feature.

In the method of the present invention, the combination of the metal strip and the molten metal may be arbitrary, but generally, a metal material having a melting point higher than that of the molten metal is used for the metal strip. However, in the metal band of Al, C having a higher melting point than Al
It is possible to inject the molten metal of u and the molten metal of Fe having a higher melting point than Cu into the metal strip of Cu by sufficiently cooling the metal strip. The thickness of the metal strip is such that it can be easily curved and is not damaged by the heat or weight of the molten metal. As a method of sequentially forming the metal strips into a tubular shape, an arbitrary forming method such as a roll forming method is applied. The position where the molten metal is supplied to the metal strip, after the metal strip begins to bend to the extent that the molten metal does not leak,
An arbitrary position can be selected until the side edge portions of the metal strip are closed. In addition, the metal strip is formed while running from the upper side to the lower side so that the molten metal is supplied to the central portion of the solidified body so that defects due to insufficient hot water do not occur inside the solidified body. It is essential.

For joining the side edge portions of the metal strip body in which the solidified body is cast-in, a method suitable for the material such as pressure welding when the metal strip body is a copper material and welding when the metal strip body is an iron material is selected. The tubular cross-sectional shape for molding the metal strip may be circular, polygonal, or the like, but a circular shape that is easy to mold is often used. To solidify the molten metal in the metal strip, cooling water is sprayed onto the outer periphery of the metal strip to cool it. The composite rod in which a solidified body of molten metal is cast and wrapped in a metal strip is directly subjected to stretching such as rolling to form a linear body having a predetermined shape.

The present invention will be specifically described below with reference to the drawings. FIG. 1 is a process explanatory view showing an embodiment of the method of the present invention. In the figure, 1 is a metal strip, and 4 and 5 are first and second roll forming machines for forming the metal strip 1 into a tubular shape, respectively. The metal strip 1 is continuously pulled out from the uncoiler 2 by the pinch roller 3 and placed on the first roll forming machine 4 with the direction downward. Here, the metal strip 1 is curved with a required gap between the side edge portions, and the molten metal 8 is injected into the curved molded body 6 from the tundish 7. The curved molded body 6 is cooled by pouring cooling water 11 in the first cooling zone 9 before injecting the molten metal 8 to prevent the metal strip from being oxidized by the heat of the molten metal.
After injecting the molten metal 8, the metal strip 1 is formed into a tubular shape by the second roll forming machine 5. The side edge portions of the metal strip 1 are formed into a tubular shape and are joined at the same time. Generally, the joining method is simply pressure welding when the metal strip and the molten metal are of the same type, and welding is used when the types are different. A second cooling zone is provided on the outer periphery of the cylindrical molded body 12 of the metal strip 1
At 10, cooling water 11 is applied to solidify the molten metal 8 therein to form a composite rod 13. This composite bar 13 is laterally guided by a guide roller 14 and rolled into a bar having a predetermined shape by a continuous rolling mill (not shown).

In the above, a welding machine 15, an accumulator 16, a rolling machine 17, and a tension roller 18 are sequentially arranged between the uncoiler 2 and the pinch roller 3. The welding machine 15 is for welding and joining the metal strips 1 to enable continuous casting for a long time, and supplies the accumulated metal strips 1 to the accumulator 16 while welding the metal strips 1. The number and intervals of the dancer pulleys 19 of the accumulator 16 are appropriately selected according to the traveling speed of the metal strip 1. The rolling mill 17 is for rolling the metal strip 1 supplied from the uncoiler 2 online.
The thickness of can be changed without stopping the operation. This rolling mill 17 is of course used when simply reducing the thickness of the metal strip 1.
It is also used when changing casting conditions such as cooling rate. The tension roller 18 keeps the tension of the metal strip 1 constant.

FIG. 2 is a partial process explanatory view showing another embodiment of the method of the present invention. This method makes it easy to control the temperature from the molten metal injection to the hot rolling on the high temperature side, and is suitable when the material of the metal strip 1 and the molten metal 8 are different. The metal strip 1 is bent by the first roll forming machine 4, heated by the preheater 20, and then the molten metal 8 is injected into the metal strip 1,
The second roll forming machine 5 forms a cylinder. In the above, the preheating by the preheater 20 is performed to enhance the affinity between the metal strip 1 and the molten metal 8, and is performed by gas combustion heating or induction heating. The heating atmosphere is a reducing or non-oxidizing atmosphere in order to prevent the metal strip 1 from being internally oxidized or surface-oxidized. After the molten metal 8 has been injected, the outer periphery of the cylindrical molded body 12 is sprayed with cooling water 11 twice. That is,
After sprinkling cooling water 11 in the first cooling zone 9, the cooling is once stopped and the composite rod 13 is reheated to a predetermined temperature by the heat of the solidified body.
It is rolled as it is, or when the temperature is too high, it is cooled to a predetermined temperature in the second cooling zone 10. It is possible to appropriately select the rolling temperature according to the combination of the material types of the metal strip 1 and the molten metal 8 to enhance the bondability between the two. FIG. 3 is a cross-sectional view showing an example of the embodiment of the composite rod 13 in the case where the material types of the metal strip and the molten metal are different, and the solidified body 21 is cast in the tubular formed body 12 of the metal strip. .

[0010]

In the present invention, the molten metal is supplied into the curved body of the metal strip to cool and solidify it in the process of bending the traveling metal strip in the width direction and successively and continuously forming it into a tubular shape. The mold is made of the same material over the entire circumference, there is no abutting part of different materials, there is no rubbing between the solidified body and the mold, and forced cooling with cooling water is possible, so a high quality ingot can be produced at high speed. can get. Further, the mold is constructed by curving a running metal strip by a roll forming machine, so that the apparatus is small. Further, since the solidified body is cast into a metal strip and stretched to form a wire rod, it is possible to manufacture a single wire rod or a composite wire rod coated with a different metal depending on the material type of the metal strip.

[0011]

EXAMPLES The present invention will be described in detail below with reference to examples. Example 1 According to the process shown in FIG. 1, a 50 mmφ phosphor bronze alloy (Cu-
5% Sn-0.25% P) is cast, and this is continuously 8 mmφ
Was hot-rolled. As the metal strip, a metal strip having the same composition as described above and having a thickness of 1 mm and a width of 170 mm and made of a phosphor bronze alloy was used. The metal strip was run at a speed of 20 m / min. And preheated to 300 ° C by reducing gas combustion heating. Next, this metal strip was applied to the side edge part by a first roll forming machine.
After bending with a gap of mm, the molten metal was poured into the curved body through the gap, and then the molten metal was applied to a second roll forming machine to form a tubular shape. The cooling water is all around the metal strip,
Fired in multiple stages. The side edges of the metal strip were pressed against each other. A large number of uncoilers in which metal strips were wound were prepared, welded with a welding machine, connected, and continuously cast for 20 hours.
The solidified body cast by the metal strip is hot-rolled as it is to 8
Made a bar material of mmφ.

Example 2 Using the apparatus shown in FIG. 2, Cu strips were used for the metal strips and Al was used for the molten metal to cast Cu-coated Al ingots, and the ingots were rods of 8 mmφ. A Cu-coated Al wire rod was manufactured by the same method as in Example 1 except that the Al wire rod was rolled. Cu
Preheating of the strip was suppressed to a low temperature of 100 ° C., and the molten metal of Al was injected, and at the same time, the cooling water was sprayed on the outer periphery of the Cu strip in the first cooling zone. After this, cooling is interrupted and the internal A
l The heat of the solidified body raises the temperature to 600 ° C to cause thermal diffusion between the Al solidified body and the Cu strip to enhance the bondability between the two, and then the cooling water is again supplied in the second cooling zone. It was applied, cooled to 540 ° C, and hot-rolled as it was to form an 8 mmφ bar.

Comparative Example 1 A phosphor-bronze ingot of 3270 mm ² was cast at a speed of 12 m / min. By a belt-wheel type continuous casting and rolling method, and this was hot-rolled into an 8 mmφ bar. Comparative Example 2 A 50 mmφ ingot was cast by the dip forming method,
This was hot rolled to 8 mmφ. Comparative Example 3 A 48 mmφ Al rod is charged into a Cu pipe having an outer diameter of 50 mmφ and a wall thickness of 1 mm to assemble a composite rod, and the composite rod is hot rolled to produce an 8 mmφ Cu-coated Al rod. did. Each of the 8 mmφ rods thus obtained was wire-drawn into 2.6 mmφ and the quality was investigated. The results are shown in Table 1 together with the casting speed. Regarding the quality, a 2.6 mmφ wire rod was annealed, and this was repeatedly twisted 180 degrees for 40 times, then subjected to a tensile test and judged by its breaking strength.

[0014]

[Table 1] Note) Belt wheel type, dip forming type,
Manufacturing speed from forming the Cu strip into an electric resistance welded tube, inserting an Al rod into it and hot rolling to 8 mmφ.

As is clear from Table 1, the method products (No. 1 and 2) of the present invention had high breaking strength of the obtained wire and were excellent in quality. Further, the side edge portion of the metal strip that was pressure-welded was not peeled off by twisting. On the other hand, the comparative example product No. 3 had a low breaking strength. This is because the casting was performed by the belt wheel type continuous casting method,
This is because the abutting portion of the belt and the wheel was not uniformly cooled and a defect was generated at the ingot portion located at the abutting portion of the ingot. Further, No. 4 cannot be cooled strongly because of the dip forming method, and the casting speed was significantly reduced. or
No. 5 was inferior in productivity, and a long material could not be manufactured. Although the case of producing the Cu alloy wire and the Cu-coated Al composite wire has been described above, the same effect can be obtained even when the method of the present invention is applied to the manufacture of the filament or the composite wire of the hard-to-cast metal material. Is something that

[0016]

As described above, according to the method of the present invention, it is possible to mass-produce high-quality metal filaments efficiently with a small-sized apparatus, which is a significant industrial effect.

[Brief description of drawings]

FIG. 1 is a process explanatory view showing an embodiment of the method of the present invention.

FIG. 2 is a process explanatory view showing another embodiment of the method of the present invention.

FIG. 3 is an explanatory cross-sectional view showing an example of the embodiment of the composite rod manufactured by the method of the present invention.

[Explanation of symbols]

 1 Metal Strip 2 Uncoiler 3 Pinch Roller 4 First Roll Forming Machine 5 Second Roll Forming Machine 6 Curved Formed Body 7 Tundish 8 Molten Metal 9 First Cooling Zone 10 Second Cooling Zone 11 Cooling Water 12 Cylindrical Formed Body 13 Composite Bar 14 Guide roller 15 Welding machine 16 Accumulator 17 Rolling machine 18 Tension roller 19 Dancer pulley 20 Preheater 21 Solidified body

Claims (1)

[Claims] 1. A molten metal is supplied into the curved body of the metal strip, and is cooled and solidified in the process of curving the running metal strip in the width direction and successively and continuously forming a tubular shape. , To form a composite rod in which the solidified body is cast in a metal strip,
Then, a method for producing a metal filament is characterized in that the composite rod is subjected to a drawing process.