JP2002018502A - Method and device for manufacturing copper rough drawn wire - Google Patents

Abstract

PROBLEM TO BE SOLVED: To provide a method and device for manufacturing copper rough drawn wire by which tensile strength is satisfied and cost reduction is realized without changing equipment in a large scale in the copper rough drawn wire used for manufacturing the strand of a hard-drawn copper wire for electric use. SOLUTION: After a material is rolled into the copper rough drawn wire 15 having a diameter of 9 mm with a 2nd hot rolling mill 13, the wire 15 is rolled into the copper rough drawn wire 16 having a diameter of 8 mm with a cold rolling mill 20 after passing it through a cooling zone 14. Hence tensile strength (MPa) is raised as compared with conventional products even when it is the copper rough drawn wire having the same diameter of 8 mm. In the case that the hard-drawn copper wire for electric use is manufactured by performing wire drawing in a wire drawing stage, work hardening such as observed in the conventional product is suppressed.

Description

DETAILED DESCRIPTION OF THE INVENTION

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a method and an apparatus for manufacturing a copper rough drawn wire which is used as an electric hard copper wire used for an overhead distribution line or the like.

[0002]

2. Description of the Related Art When an electric hard copper wire drawn by drawing a rough copper wire is used as an overhead distribution line, generally, a rough copper wire having an outer diameter of 8 mm is drawn and hard copper wire for an electric wire. The mainstream is to manufacture the strands.

FIG. 3 is a layout diagram schematically showing an example of a production line for copper rough drawn wires. For example, from casting machine 1 to 20
An ingot size of 00 to 7000 mm ² is cast and sent to the first hot rolling mill 3 on the conveyor line 2, where it is rolled to a size of, for example, about 700 mm ² .
Subsequently, it is sent to a second hot rolling mill 4 on the same line and rolled to produce a copper rough wire 6 having a diameter of 8 mm, cooled in the cooling zone 5 and then fed with pinch rolls 7A and 7B as feed rollers. It is pulled and sent to the coiler 8 to converge.

[0004]

However, the conventional method and apparatus for producing a copper rough drawn wire shown in FIG. 3 have the following problems to be solved.

One of the fundamental problems is that, when an electric hard copper wire having a wire diameter of 3.2 mm or more is to be obtained, as shown in a characteristic graph of FIG. 2
When the copper rough drawn wire 8 mm in diameter rolled by the hot rolling mill 4 is drawn, the work hardening is small, and as a result, the tensile strength (MPa) below the JIS standard shown by the broken line curve in the figure is reduced. (Point A in FIG. 4).

[0006] One is related to the above-mentioned problems, and is based on JIS.
In order to obtain a tensile strength satisfying the standard, the second hot rolling mill 4 rolls the copper rough drawn wire 6 having a diameter of 10 mm and applies a large drawing force to the copper rough drawn wire 6 to thereby obtain a tensile strength satisfying the JIS standard. In some cases, a measure for producing a hard copper wire for electric use having a strength wire diameter of 3.2 mm or more is adopted.

However, in this case, a second hot rolling mill 4 of the same model as that of the case of rolling 8 mm is used for rolling 10 mm in diameter. Therefore, the following replacement work is required mainly for the second hot rolling mill 4 and other line equipment. That is, 1. 1. A part replacement operation for removing the final two-stage stand of the second hot rolling mill 4 and attaching and setting a guide pipe; The pinch rolls 7A and 7B for feeding the copper rough drawn wire 6 from the second hot rolling mill 4 to the coiler 8 have a diameter of 8 mm.
2. A pinch roll replacement operation to replace the specification type with the one with a diameter of 10 mm. The winding speed of the copper rough wire 6 in the coiler 8
speed adjustment work for changing from a corresponding speed of 10 mm to a corresponding speed of 10 mm in diameter, and the like.

On the other hand, the obtained copper rough wire 6 having a diameter of 10 mm is drawn to produce a hard copper wire for electric wire. Is required. That is, 1. 1. A large die exchange operation, in which the copper rough drawing wire is changed from a diameter of 8 mm to a diameter of 10 mm to replace the corresponding drawing die. In general, the frequency of using a copper rough wire 6 having a diameter of 10 mm is low, and it is uneconomical in terms of maintenance and management costs if a dedicated wire drawing machine is installed because of such demand. The work of replacing the copper rough wire 6 with the equipment, and the like.

As is apparent from the above, simply changing the copper rough wire from a diameter of 8 mm to a diameter of 10 mm requires enormous labor, man-hours and equipment costs, etc. Will be reflected in

[0010] Accordingly, an object of the present invention is to provide a copper rough drawn wire used for the production of an electric hard copper wire, which satisfies the tensile strength and does not require a large-scale equipment change, resulting in a significant cost reduction. It is an object of the present invention to provide a method and an apparatus for producing a copper rough drawn wire, which can realize the following.

[0011]

In order to achieve the above object, a method of manufacturing a copper rough drawn wire according to the first aspect of the present invention is to form a copper ingot into a first hot rolling mill 12 and a second hot rolling mill. Rolling is performed stepwise by a hot rolling mill 13, cooled to a required temperature in a cooling zone 14, and then sent to a coiler 17 by a feed roller to be converged. The copper hot wire 15 having a diameter of 9 mm by the second hot rolling mill 13 is used. After passing through a cooling zone 14, a diameter of 8 m
It is characterized by being rolled into a copper rough drawn wire 16 of m.

From the above, the copper rough drawn wire 15 rolled to 9 mm in diameter in the second hot rolling mill 13 is further rolled to the copper rough drawn wire 16 in 8 mm in diameter in the cold rolling mill 20 as a second stage. Even when the same copper rough drawn wire with the same diameter of 8 mm is used, the tensile strength (MPa) is greatly increased as compared with the conventional product, and when drawing wires such as electric hard copper wire by drawing in the drawing process, Work hardening unlike conventional products can be suppressed.

Further, the method for producing a copper rough drawn wire according to the second aspect of the present invention is a method for manufacturing a copper rough drawn wire having a diameter of 9 mm by directly utilizing the second hot rolling mill of existing equipment capable of rolling into a copper rough drawn wire having a diameter of 8 mm or 10 mm. It is characterized by being rolled into a copper rough drawn wire 15.

As described above, by using the second hot rolling mill 13 of the existing equipment as it is to roll the copper rough wire 15 having a diameter of 9 mm, the labor for remodeling and replacing parts can be saved.

Further, in the method for producing a rough copper wire according to the third aspect, the temperature of the diameter of 9 mm, which has been rolled and sent out by the second hot rolling mill 13 in the cooling zone 14, is adjusted to the rough copper wire. 15 is cooled to the range of 40 to 60 ° C.

From the above, by controlling the cooling of the rough copper wire 15 rolled to a diameter of 9 mm to a suitable temperature,
The second stage rolling in the cold rolling mill 20 in the next step is effectively performed. That is, a copper rough wire 15 having a diameter of 9 mm.
If the temperature is too high, for example, 100 ° C., it is difficult to obtain a copper rough wire 16 having a diameter of 8 mm obtained by rolling in the cold rolling mill 20 that satisfies the tensile strength.

On the other hand, in the apparatus for producing a rough copper wire according to the present invention, a copper ingot is rolled by a first hot rolling mill 12 and a second hot rolling mill 13, and a cooling zone 14 is formed. After cooling to a required temperature, the feed roller is fed to the coiler 17 by a feed roller to converge. The second hot rolling mill 13 can roll a copper rough wire having a diameter of 8 mm or 10 mm and a diameter of 9 mm. The copper rough wire 15 of 9 mm in diameter can also be rolled.
5 is further characterized in that a cold rolling mill 20 for rolling a rough copper wire 16 having a diameter of 8 mm is arranged downstream of the cooling zone 14.

With the above configuration, the second hot rolling mill 13 can use the existing equipment as it is, and does not require any operation such as part replacement. Further, by disposing the cold rolling mill 20 on the downstream side of the cooling zone 14, a steel sheet having a required tensile strength can be obtained at the stage of rolling the diameter of the rough drawn wire from 9 mm to 8 mm, which satisfies the JIS standard value. I do. Furthermore, when the diameter size is changed from 8 mm in diameter to 10 mm in diameter as in the conventional equipment, no labor such as replacement of the feed roller corresponding to the diameter is required, and a jig and the like accompanying the replacement are unnecessary. .

In the apparatus for manufacturing a rough copper wire according to a fifth aspect of the present invention, the feed roller is disposed at an upstream inlet of the cold rolling mill 20 to cold roll the rough copper wire 15 having a diameter of 9 mm. For drawing the copper rough drawn wire 16 having a diameter of 8 mm, which is disposed at the downstream side outlet and rolled by the cold rolling mill 20, and sends the drawn copper rough drawn wire 16 to the coiler. It is characterized by having.

With the above configuration, the feed rollers disposed before and after the entrance to and exit from the cold rolling mill 20 have a copper rough winding diameter of 9 m.
Although they are arranged corresponding to m and 8 mm diameters, they can be used as they are without the need to replace them with corresponding feed rollers when the size is changed to 10 mm as in the prior art.

[0021]

BEST MODE FOR CARRYING OUT THE INVENTION Hereinafter, embodiments of a method and an apparatus for manufacturing a copper rough drawn wire according to the present invention will be described in detail with reference to the drawings.

FIG. 1 shows a production line for rough copper copper wire, which is a production apparatus of the present embodiment. For example, an ingot having a size of 2000 to 7000 mm ² is cast from the casting machine 10. A first hot rolling mill 12 is provided upstream on a conveyor line 11 extending from the casting machine 10, and rolls the ingot as a first step to a size of, for example, about 700 mm ² . Downstream of the first hot rolling mill 12, a second hot rolling mill 13 is provided. In the second hot rolling mill 13, the second hot rolling mill 13 has a required size as a second stage, and in this example, has a diameter of 9 mm as described later. Rolling is performed to send the copper rough wire 15 to the next cooling zone 14. The same equipment as the conventional apparatus shown in FIG. 3 can be used for each equipment of the production line so far.

Downstream of the cooling zone 14, a cold rolling mill 20, which is a facility of the present invention, is disposed.

The cold rolling mill 20 is provided with pinch rolls 21, 22, and 23 as feed rollers at the upstream inlet and the downstream outlet, respectively. The inlet side pinch roll 21 is equipment for winding the copper rough wire 15 flowing through the cooling zone 14 and sending it to the cold rolling mill 20.
The exit side pinch rolls 22 and 23 are connected to the cold rolling mill 20.
This is a facility for sending the copper rough drawn wire 16 of the target size rolled by the above to the coiler 21 to converge it.

Next, a description will be given of a method of manufacturing a copper rough drawn wire 16 having a target diameter of 8 mm and a tensile strength significantly higher than that of a conventional product in a manufacturing line including the above-described facilities.

The manufacturing steps from the casting machine 10 to the first hot rolling mill 12 are the same as those in the case of the conventional equipment shown in FIG. 3, and the following second hot rolling mill 13 is applied to the manufacturing method of the present invention. The process proceeds to such a summary step.

A: Work to roll to 9φ diameter copper rough drawn wire
In the second hot rolling mill 13 degree, and rolling the ones prior to the first hot rolling mill the example about 700 mm ² size fed from 12 steps in diameter size "9mm" DoAra wire rods 1
Serve as 5.

B: Cooling Step A copper rough wire 15 having a diameter of 9 mm obtained by rolling in the second hot rolling mill 13 is sent to the cooling zone 14, where it is 40 to 60.
Cool to a temperature of ° C. The surface of the copper rough wire 15 rolled to the diameter of 9 mm and leaving the second hot rolling mill 13 is oxidized at that stage, and the surface oxide film is reduced by cooling in the cooling zone 14 to obtain a glossy rough surface. Make a line. Further, by cooling and cooling the copper rough drawn wire 15 rolled to a diameter of 9 mm to a suitable temperature, the second-stage rolling in the cold rolling mill 20 in the next step is effectively performed. That is,
When the temperature of the copper rough wire 15 having a diameter of 9 mm is too high, for example, 100 ° C., it becomes difficult to obtain a copper rough wire 16 having a diameter of 8 mm obtained by rolling in a cold rolling mill 20 with sufficient tensile strength. .

C: Work to roll to 8φ diameter copper rough drawn wire
In the cold rolling mill 20, the copper rough wire 15 having a diameter of 9 mm flowing from the cooling zone 14 is fed by the upstream pinch roll 21, and the copper rough wire 15 having a diameter of 9 mm is cold-rolled to have a diameter of “ A target copper rough wire 16 having a diameter of 8 mm, which is reduced in diameter to "8 mm", is obtained.

D: Coiler Converging Step The copper rough drawn wire 16 having a diameter of 8 mm that has been rolled by the cold rolling mill 20 is pulled out by the pinch rolls 22 and 23 on the outlet side and converged on the coiler 17.

On the other hand, the copper rough drawn wire 16 having a diameter of 8 mm manufactured in each step up to this step is sent to the next wire drawing step, and a hard copper wire for electric use with a required element wire size is manufactured.

FIG. 2 shows the work hardening of the hard copper wire for electrical use obtained by the wire drawing in this way based on the correlation between the wire size and the tensile strength (MPa).
It is a characteristic graph compared with the standard value.

According to this, the copper rough wire 16 having a diameter of 8 mm manufactured in the present embodiment and the copper rough wire 6 having a diameter of 8 mm of a conventional product of the same size as a comparative example (see FIG. 4) have tensile strengths. In comparison, the copper rough wire 16 having a diameter of 8 mm of the present example was 280 to 320 MPa, while the copper rough wire 6 having a diameter of 8 mm of the conventional example was 210 to 250 MPa.
That is, in the copper rough drawn wire 16 having a diameter of 8 mm of the present example, a copper wire whose strength was increased by "30%" as compared with the conventional example was obtained.

As can be understood from the characteristic graph of FIG. 2, when the copper rough drawn wire 16 having a diameter of 8 mm of this example is drawn and drawn, the size of the wire having a diameter of 3.2 mm or more is 5 m.
Even with mφ, it satisfies the JIS standard value. Further, when the wire size is 1.0 mmφ, a tensile strength increased by about 8% compared to the conventional product can be obtained. In the fine wire region, the brittleness appears when the tensile strength is increased.
In No. 6, the increase in the tensile strength of 1.0 mmφ is small, and there is no brittleness.

[0035]

As described above, the method for producing a copper rough drawn wire according to the first aspect of the present invention is a method for manufacturing a copper rough drawn wire having a diameter of 9 mm in a second hot rolling mill. As it is rolled into a copper rough wire with a diameter of 8 mm using a cold rolling mill, the tensile strength of copper rough wire with the same diameter of 8 mm is greatly increased compared to the conventional product, and the wire is drawn in the wire drawing process. In the case of manufacturing a hard copper wire for use, work hardening unlike conventional products is suppressed.

In the method for producing a copper rough drawn wire according to the second aspect, a second hot rolling mill of existing equipment can be used as it is for rolling to a copper rough drawn wire having a diameter of 9 mm. Work labor can be saved.

The method for producing a copper rough drawn wire according to the third aspect of the present invention is characterized in that the copper rough drawn wire rolled to a diameter of 9 mm is controlled to be cooled to a suitable temperature, so that the second process in the cold rolling mill in the next step is performed. The rolling at the stage is effectively performed. That is, when the temperature of the copper rough wire having a diameter of 9 mm is too high, for example, 100 ° C., it is difficult to obtain a copper rough wire 16 having a diameter of 8 mm obtained by rolling with a cold rolling mill with sufficient tensile strength. However, such inconvenience can be solved by cooling management at a suitable temperature.

On the other hand, in the apparatus for producing a copper rough drawn wire according to the fourth aspect of the present invention, the second hot rolling mill can use the existing apparatus as it is, and does not require any operation such as part replacement. Further, by disposing the cold rolling mill on the downstream side of the cooling zone, a steel sheet having a required tensile strength can be obtained at the stage of rolling the rough drawn wire from 9 mm to 8 mm, which satisfies the JIS standard value. Furthermore, as with the conventional equipment, the diameter is 8m.
When the diameter size is changed from m to 10 mm in diameter, work labor such as replacement of the feed roller corresponding to the diameter size becomes unnecessary, and jigs and the like accompanying the replacement are unnecessary, so that a rise in equipment costs can be suppressed. It is valid.

In the apparatus for producing a rough copper wire according to the fifth aspect, the feed rollers disposed before and after the entrance of the cold rolling mill are arranged corresponding to the 9 mm and 8 mm copper rough windings. There is no need to replace the feed roller with a corresponding feed roller when the size is changed to a diameter of 10 mm as in the related art.

[Brief description of the drawings]

FIG. 1 is a layout side view showing a manufacturing line as an embodiment of a copper rough drawn wire manufacturing apparatus according to the present invention.

FIG. 2 is a characteristic graph showing work hardening characteristics based on a correlation between a strand size and a tensile strength (MPa).

FIG. 3 is a layout side view showing a manufacturing line in a conventional example of a copper rough wire manufacturing apparatus.

FIG. 4 is a characteristic graph showing a work hardening characteristic based on a correlation between a strand size and a tensile strength (MPa) of a conventional example.

[Explanation of symbols]

DESCRIPTION OF SYMBOLS 10 Casting machine 11 Conveyor line 12 1st hot rolling mill 13 2nd hot rolling mill 14 Cooling zone 15 Copper rough drawing wire of 9 mm in diameter 16 Copper rough drawing wire of 8 mm in diameter 17 Coiler 20 Cold rolling mill 21 Inlet pinch roll ( Feed roller) 22, 23 Exit side pinch roll (feed roller)

Claims (5)

[Claims] The copper ingot is rolled stepwise by a first hot rolling mill and a second hot rolling mill, cooled to a required temperature in a cooling zone, and then fed to a coiler by a feed roller to converge. A method for producing a copper rough wire, wherein the second hot rolling mill rolls the copper rough wire having a diameter of 9 mm, passes it through a cooling zone, and then forms a copper rough wire having a diameter of 8 mm by a cold rolling mill. A method for producing a copper rough drawn wire, characterized by rolling. 2. A copper wire having a diameter of 9 mm is rolled using the second hot rolling mill of existing equipment capable of rolling a copper wire having a diameter of 8 mm or 10 mm. 2. The method for producing a copper rough drawn wire according to 1. 3. In the cooling zone, the copper rough drawn wire is cooled to a temperature of 40 to 60 ° C. at a temperature of 9 mm in diameter, which has been rolled and sent by the second hot rolling mill. Item 3. The method for producing a copper rough drawn wire according to Item 1 or 2. 4. A copper ingot is rolled by a first hot rolling mill and a second hot rolling mill, cooled to a required temperature in a cooling zone, fed to a coiler by a feed roller and converged by a feed roller. The second hot rolling mill has a diameter of 8 mm or a diameter of 10 mm.
In addition to being able to roll to a copper rough wire of 9 mm diameter, it is also possible to roll a copper rough wire of 9 mm in diameter, and a cold rolling mill that rolls the copper rough wire of 9 mm in diameter to a copper rough wire of 8 mm in diameter is available. An apparatus for producing a rough copper wire, which is disposed downstream of the cooling zone. 5. The feed roller is disposed at an upstream inlet of the cold rolling mill for drawing the rough copper wire having a diameter of 9 mm into the cold rolling mill, and is disposed at a downstream outlet of the cold rolling mill. The above-mentioned diameter 8 mm rolled by a cold rolling mill
5. The apparatus for producing a copper rough drawn wire according to claim 4, wherein the copper rough drawn wire is pulled out and sent to the coiler. 6.