JP2009195921A - Method for manufacturing copper wire - Google Patents

Abstract

<P>PROBLEM TO BE SOLVED: To provide a method for manufacturing a copper wire, capable of stably executing an operation of inserting a wire material such as a copper mother wire into a hole of a wire drawing die and stably manufacturing a copper wire with a very small diameter at high production efficiency. <P>SOLUTION: The wire drawing die 1 has such a structure that its outer shape is cylindrical, and has a hole 2 for inserting a copper mother wire 4 into the center of the cylinder. The die 1 can be halved into two pieces 1a, 1b at a surface through the central axis of the hole 2. The method of manufacturing a copper wire includes a step of bringing the wire drawing die 1 into a state that the die 1 is split in the two pieces 1a, 1b, and a step of closing the two pieces 1a, 1b, while sandwiching the copper mother wire 4 between vertically halved holes 2a, 2b of the two pieces 1a, 1b, to return the die 1 into a state that the dice 1 is not split, thereby bringing the mother wire 4 into a state of being inserted into the holes of the two pieces 1a, 1b of the wire drawing die 1. <P>COPYRIGHT: (C)2009,JPO&INPIT

Description

  The present invention relates to a method for producing a copper wire, such as a core wire or a shield wire of a coaxial cable, used for example in an electronic device or a medical device.

  Conventionally, copper and copper alloy wires have been used for cable conductors for electronic devices and medical devices. A cable conductor used for such an application is generally processed to a desired wire diameter by drawing a large-sized copper rough wire through a drawing die in a cold state. At that time, for the purpose of increasing the drawing speed and continuation of the drawing work, a continuous drawing machine in which a plurality of drawing dies are arranged in the drawing line and the drawing process is performed in multiple stages is used. It has become mainstream.

In recent years, there has been a demand for further reduction in the diameter of cables in order to meet the technical needs of electronic devices that are smaller and lighter in electronic equipment, and further reduction in the diameter of copper wires used as the conductor wires. In other words, the production of fine wires has become indispensable.
In the conventional method of manufacturing an ultrafine wire, when passing a copper wire through a wire drawing die, the tip of the copper wire is made particularly thin by dissolving the tip of the copper wire with a solvent or straightening the tip of the copper wire. In general, it is easy to pass through a wire drawing die, but the work of passing the tip of the copper wire through the wire drawing die is performed for each wire drawing die by a skilled worker.

  The diameter of wire drawing dies for ultra-fine wires is extremely small, so the work of passing the tip of the copper wire through the hole of the wire drawing die tends to be extremely difficult. For example, it has become virtually impossible to efficiently perform such extra-fine wire drawing work. However, even a skilled worker may spend time and effort on an operation of passing a copper wire through a wire drawing die (also referred to as a so-called hole-through operation; the same applies hereinafter).

  In order to overcome the difficulty of such hole-penetrating work, in the conventional technique, a dedicated jig is provided on the wire drawing die, and the hole portion is photographed with a CCD camera or the like and is enlarged and displayed on a monitor screen or the like. There has been proposed a method of passing a copper wire through a hole of a wire drawing die while finely adjusting the position in the X-axis direction and the Y-axis direction using a dedicated jig (Patent Documents 1 and 2).

JP 2007-29998 A Japanese Patent Laid-Open No. 06-529

However, in the conventional technique as described above, since it is necessary to perform the hole-piercing operation one by one using a dedicated jig for each wire drawing die, wire drawing is performed in multiple stages as in recent years. In some cases, coupled with the increase in the total number of wire drawing dies, there is a concern that the time and labor required for the hole-piercing operation will be further increased.
Also, after passing the wire (copper wire) through the hole of the wire drawing die, when the wire drawing die is removed from the dedicated jig, the wire is rubbed against the jig, etc. There is a risk of causing twisting.
In addition, when performing hole-piercing work that requires fine position adjustment, as shown above, devices for enlargement display such as CCD cameras and monitor devices are required. There is also a concern that the management becomes complicated.

The present invention has been made in view of such problems, and its purpose is to stably perform a work of passing a wire material such as a copper bus wire through a hole of a wire drawing die in a short time. In particular, an object of the present invention is to provide a copper wire manufacturing method capable of stably manufacturing a copper wire having an extremely thin wire diameter with high manufacturing efficiency.

  The method for producing a copper wire according to the present invention is a method for producing a copper wire including a step of performing cold wire drawing on the copper bus wire by inserting the copper bus wire into a hole of the wire drawing die, The outer shape is a columnar shape, a hole through which the copper bus bar can be inserted is provided at the center of the column, and a structure that can be divided into two pieces on a plane passing through the central axis of the hole, After the wire drawing die is divided into the two pieces, the two pieces are closed while sandwiching the copper bus between the holes vertically divided in half in each of the two pieces. In addition, the method includes a step of bringing the copper bus bar into a state of being inserted into the hole of the wire drawing die by returning to the integrated state before the division.

  According to the present invention, since the wire drawing die is divided into two pieces, the copper bus bar can be attached to and detached from the hole of the wire drawing die. It is possible to stably carry out the operation of inserting into the hole of the wire drawing die in a short time, and in particular, to manufacture a copper wire with a very thin wire diameter with high production efficiency. Is possible.

Hereinafter, the manufacturing method of the copper wire which concerns on this Embodiment, and the wire drawing die used for it are demonstrated with reference to drawings.
FIG. 1 is a diagram showing a wire drawing die used in a method for manufacturing a copper wire according to an embodiment of the present invention, and FIG. 2 is a state in which a copper bus bar is inserted into a hole in the wire drawing die shown in FIG. FIG. 3 is a diagram showing an opening / closing operation of a wire drawing die in operation, FIG. 3 is a diagram showing an example of a wire drawing device for drawing copper wire using the wire drawing die shown in FIG. 1, and FIG. The figure which shows the variation of the wire drawing die used for the manufacturing method of the copper wire which concerns on embodiment of invention, FIG. 5 is other of the wire drawing die used for the manufacturing method of the copper wire which concerns on embodiment of this invention FIG. 6 is a view showing a state in which the wire drawing dies according to the embodiment of the present invention are mounted and held on the die holder.

As shown in the perspective view of FIG. 1 (a) and the front view of FIG. 1 (b), the wire drawing die 1 according to the present embodiment has a cylindrical outer shape and is provided with a hole 2 penetrating the front and rear thereof. It is formed in a structure that can be divided into two pieces of one piece 1a and the other piece 1b on the surface passing through the central axis of the hole 2.
The two pieces of the one piece 1a and the other piece 1b constituting the main body of the wire drawing die 1 are mechanically connected by a pin 3 (or a hinge or a similar shaft support mechanism). While the pin 3 is supported as an axis, as shown in FIG. 2 (a), the one piece 1a and the other piece 1b are divided into a state in which the mouth is opened, and conversely, FIG. ), The one piece 1a and the other piece 1b are closed and integrated so as to return to the columnar state of the original wire drawing die 1.

The hole 2 penetrating forward and backward through the center of the wire drawing die 1 is composed of a continuous tapered hole portion 21 and a straight hole portion 22 as shown in the cross-sectional view of FIG.
The taper hole portion 21 is provided with a predetermined taper angle (approach angle). In the wire drawing process, the copper bus bar 4 is fed into the hole 2 from the right side in FIG. At this time, cold drawing is performed so that the diameter is reduced by the taper of the tapered hole portion 21. Then, it passes through the straight hole portion 22 and is sent to the outside of the wire drawing die 1 (the left outer side of the wire drawing die 1 in FIG. 1C).

  In the copper wire manufacturing method according to the present embodiment, using such a wire drawing die 1, a metal bus such as a copper bus 4 is inserted through the hole 2 in a short time with a simple operation. To the state. After that, the copper bus 4 is cold drawn by applying a predetermined appropriate feeding speed and tensile force.

  The wire drawing die 1 is used in a wire drawing device 30 as shown in FIG. The wire drawing device 30 includes a first capstan 31 and a second capstan 32 having a multi-stage stopper, which are supported by rotary shafts 41 and 42, respectively. , 42 is rotated by a motor (not shown). The copper bus 4 that is the object of wire drawing is coated with liquid lubricant or water on the surface, and is bridged between the first capstan 31 and the second capstan 32 so as to travel back and forth multiple times. Thus, multi-stage cold drawing is performed by a plurality of wire drawing dies 1 arranged in the middle of the path.

  As a more specific example, the copper bus 4 delivered from a delivery reel (not shown) passes through a plurality of wire drawing dies 1 in the first row, so that the first stage cold wire drawing is performed. After that, the first capstan 41 is folded half way around, and then the second first capstan 42 is turned half way around before passing through the plurality of wire drawing dies 1 in the second row. Then, the second stage of cold wire drawing is performed. In the example of FIG. 3, such a process is repeated over four stages, thereby gradually reducing the diameter of the copper bus bar 4.

Prior to performing the cold wire drawing of the copper bus bar 4 as described above, the copper bus wire 4 must be inserted into the wire drawing die 1, and the work is performed according to the present embodiment. According to the wire die 1 and the method of manufacturing a copper wire using the same, it is possible to carry out the process in a very simple and reliable manner.
That is, prior to performing cold drawing of the copper bus bar 4, first, the tip portion of the copper bus bar 4 is melted with a solvent or straightened, for example, so that only that portion is made particularly thin.

  And as shown to Fig.2 (a), the drawing die 1 is made into the state opened to 1 piece 1a and the other piece 1b (divided), and the half body formed by dividing | segmenting the hole 2 vertically The holes 2a and 2b are exposed so that the copper bus 4 can be directly approached to the holes 2a and 2b from the outside. Then, in this state, the copper bus 4 is set between the one piece 1a and the other piece 1b of the wire drawing die 1, and the piece 1a of the wire drawing die 1 and the other are gradually sandwiched without damaging it. The piece 1b is opened (divided) into a closed (combined and integrated cylindrical) state as shown in FIG. 2B. Then, as the one piece 1a and the other piece 1b of the wire drawing die 1 are gradually closed, the copper bus bar 4 closes the holes 2a and 2b of each half body (in other words, divided into two parts in a vertically divided manner). It settles down to the state inserted in one hole 2 formed.

As described above, according to the copper wire manufacturing method using the wire drawing die according to the present embodiment, it is extremely difficult with the conventional so-called hole-penetrating work method, for example, an extremely fine wire diameter of 30 μm or less. The process of inserting the copper bus bar 4 into the hole 2 can be performed only by simple operations, even for non-skilled workers, complicated and large CCD imaging devices, monitor screen displays (both not shown), etc. It is possible to reliably and stably execute in a short time without using. As a result, it is possible to shorten the work time of the entire wire drawing process, and to prevent the elongation or twisted wire breakage during the wire drawing work when the copper bus wire 4 is passed through each wire drawing die 1. It is possible to stably manufacture a very fine wire with high manufacturing efficiency. From this, the manufacturing method of the copper wire which concerns on embodiment of this invention is a thing suitable especially for what is called an ultrafine wire drawing process with a wire diameter of 30 micrometers or less.
Moreover, since the wire drawing die 1 as described above can be applied as it is to a general wire drawing device 30, no major modification of the wire drawing device or equipment is required, and the manufacturing process required for it is simplified. -Advantages in manufacturing technology such as higher throughput and lower manufacturing costs can also be expected.
In contrast to the above, when removing the copper bus 4 from the wire drawing die 1, it is only necessary to open (divide) the one piece 1 a and the other piece 1 b of the wire drawing die 1. The removal work can be reliably performed in a short time without damaging the bus bar 4.

  Here, as a conventional example, a conventionally proposed wire drawing die 70 as shown in FIG. 7 is considered. This wire drawing die 70 has a die inner 71 having a tapered outer shape and a taper hole 73 in the die outer 72. And is used by being pushed in by an air cylinder (not shown) or the like (see Patent Document 2). In the wire drawing die 70 according to such a conventional technique, in particular, the contact portion 74 between the die inner side 71 and the die outer side 72 at that time is between the two because it is pressed and fixed by an air cylinder or the like (not shown). There are inconveniences such as high risk of damage and wear due to friction, and there is a high risk of misalignment between the inner die 71 and the outer die 72. Alternatively, the inner die 71 is tightened so as to bite into the tapered hole 73 of the outer die 72 due to the force applied at the time of pressing and fixing, and finally the inner die 71 is taken out from the outer die 72. However, there is a possibility that both of them are fixed and difficult to separate. Also, coupled with the fact that a large number of wire drawing dies 70 are required in one wire drawing process, dedicated cylinders or the like for mechanically holding the wire drawing dies 70 are prepared for the number of wire drawing dies 70. In addition, since the wire drawing apparatus must be arranged at each corresponding location, there has been a disadvantage that the addition of such facilities and devices and a large-scale modification of the whole wire drawing apparatus are required.

  In contrast, the wire drawing dies 1, 11, and 12 according to the embodiment of the present invention have a cylindrical outer shape, and are simply dropped into the die holder 60 as shown in FIG. Since it is securely held in the die holder 60 simply by being mounted, there is no possibility of causing damage or significant wear and displacement due to friction with the die holder 60 and the like, and there is no possibility of adhering to the die holder 60. Further, since it is not necessary to add a dedicated cylinder device or the like for mechanically holding the wire drawing dies 1, 11, 12 according to the embodiment of the present invention, the addition of those facilities and devices or the entire wire drawing device is not necessary. There is no need to make major modifications. Thus, as is clear from the comparison with the conventionally proposed technology, the copper wire manufacturing method and the wire drawing die used therefor according to the embodiment of the present invention have many merits.

  Here, the wire drawing die 1 used in the method of manufacturing a copper wire according to the embodiment of the present invention is not limited to a structure that is pivotally supported by the pin 3 as described above and can be divided for opening and closing operation. 4 and FIG. 5, it is also possible to adopt a structure in which when one part is divided into two, the one piece 1a and the other piece 1b are completely separated and separated.

That is, the wire drawing die 11 shown in FIG. 4 is provided with two screw-through holes 13 and 14 in one piece 11a, and screw holes 15 and 16 formed by cutting so-called taps in the other piece 11b. Is provided.
In the wire drawing die 11, as shown in FIG. 4 (a), when the one piece 11a and the other piece 11b are not combined, it is possible to completely separate both of them. ing.

In this separated state, the copper bus bar 4 is set between the one piece 11a and the other piece 11b of the wire drawing die 11 and gradually sandwiched without damaging it. From the state where the piece 11b is divided, the state is combined with no gap as shown in FIG. 4B. Then, as the one piece 11a and the other piece 11b of the wire drawing die 11 are gradually combined, the copper bus bar 4 is inserted into the single hole 2 formed by combining the holes 2a and 2b of each half body. Calm down. Then, using a screw (not shown) such as a small screw, the one piece 11a and the other piece 11b of the wire drawing die 11 are fixed in a state where they are combined with no gap.

  According to the method of manufacturing a copper wire using such a wire drawing die 11, as in the case of the wire drawing die 1, the copper bus 4 is inserted into the hole 2, which is difficult with the conventional so-called hole-penetrating work method. The process to achieve the state is made stable in a short time by simple work, even for non-skilled workers, and without using a complicated and large-scale CCD imaging device or monitor screen display device. Can be executed. As a result, it is possible to shorten the work time of the entire wire drawing process, and to prevent the elongation or torsion during the wire drawing work when the copper bus wire 4 is passed through each wire drawing die 11. It is possible to stably manufacture a very fine wire with high manufacturing efficiency.

In the wire drawing die 12 shown in FIG. 5, two pin holes 17 and 18 are provided in one piece 12a, and so-called knock pins 19 and 20 are provided in the other piece 12b.
In the wire drawing die 12, as shown in FIG. 5 (a), when the one piece 12a and the other piece 12b are not combined, it is possible to separate them completely and separate them. ing.

  In this separated state, the copper bus bar 4 is set between the one piece 12a and the other piece 12b of the wire drawing die 12, and the piece 12a of the wire drawing die 12 and the like are gradually sandwiched without damaging it. From the state in which the piece 12b is divided, the state is combined with no gap as shown in FIG. Then, as the one piece 12a and the other piece 12b of the wire drawing die 12 are gradually combined, the copper bus bar 4 is inserted into the single hole 2 formed by combining the holes 2a and 2b of the half bodies. Calm down. At this time, the dowel pins 19 and 20 are fitted into the pin holes 17 and 18, so that the positioning of the one piece 12a and the other piece 12b of the wire drawing die 12 is automatically performed smoothly. Thereafter, the wire drawing dies 12 are mounted on a die holder as shown in FIG. 6 and mechanically held in a state of being combined without any gaps.

  Also in the copper wire manufacturing method using the wire drawing die 12, the copper bus 4 is difficult to connect to the wire drawing die 12, which is difficult with the conventional so-called hole-penetrating operation method, as in the case of the wire drawing die 1. It is possible to reliably and stably execute the process of setting the hole 2 in a short time by only simple work. As a result, it is possible to shorten the work time of the whole wire drawing process, and to prevent the elongation or twist break during the wire drawing work when the copper bus wire 4 is passed through each wire drawing die 12. It is possible to stably manufacture a very fine wire with high manufacturing efficiency.

It is a figure which shows the wire drawing die | dye used for the manufacturing method of the copper wire which concerns on embodiment of this invention. It is a figure which shows operation | movement of the wire drawing die at the time of the operation | work which makes the state which made the copper wire pass through the wire drawing die in the manufacturing method of the copper wire which concerns on embodiment of this invention. It is a figure which shows an example of the wire drawing apparatus which draws a copper wire using the wire drawing die shown in FIG. It is a figure which shows the variation of the wire drawing die | dye used for the manufacturing method of the copper wire which concerns on embodiment of this invention. It is a figure which shows another variation of the wire drawing die | dye used for the manufacturing method of the copper wire which concerns on embodiment of this invention from the given thing shown in FIG. It is a figure which shows the state which mounted | wore and hold | maintained the wire drawing die | dye used for the manufacturing method of the copper wire which concerns on embodiment of this invention to a die holder. It is a figure which shows an example of the wire drawing die based on the prior art for the comparison with the manufacturing method of the copper wire which concerns on embodiment of this invention, and the wire drawing die used therewith.

Explanation of symbols

DESCRIPTION OF SYMBOLS 1 Wire drawing die 2 Hole 3 Pin 4 Copper bus-line 13, 14 Screw through hole 15, 16 Screw hole 17, 18 Pin hole 19, 20 Knock pin 30 Wire drawing apparatus 31 1st capstan 32 2nd capstan 60 Die holder

Claims (5)

A method of manufacturing a copper wire including a step of performing cold wire drawing on the copper bus wire by inserting the copper bus wire into a hole of a wire drawing die,
The wire drawing die has a cylindrical outer shape, a hole through which the copper bus bar can be inserted is provided at the center of the cylinder, and a structure that can be divided into two pieces on a plane passing through the central axis of the hole. Shall have
After the wire drawing die is divided into the two pieces, the two pieces are closed while sandwiching the copper bus between the holes vertically divided in half in each of the two pieces. A method for producing a copper wire comprising the step of bringing the copper bus bar into a state of being inserted into the hole of the wire drawing die by returning to the integrated state before division. In the manufacturing method of the copper wire of Claim 1,
A method for producing a copper wire, characterized in that two pieces of the wire drawing dies are axially supported by a shaft support mechanism such as a pin or a hinge. In the manufacturing method of the copper wire of Claim 1 or 2,
A method of manufacturing a copper wire, wherein two pieces of the wire drawing dies can be screwed together. In the manufacturing method of the copper wire as described in any one of Claims 1 thru | or 3,
A method of manufacturing a copper wire, wherein a positioning member such as a knock pin and a hole into which the knock pin is fitted is provided on each of two pieces of the wire drawing dies. In the manufacturing method of the copper wire as described in any one of Claims 1 thru | or 4,
A method for producing a copper wire, comprising drawing the copper bus bar to produce a copper wire having a wire diameter of 30 μm or less.

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