JP6948561B2 - Manufacturing method of stranded conductor - Google Patents

Description

The present invention particularly relates to a method for manufacturing a stranded conductor used in a cable that requires bending resistance.

As the conductor used for the cable, for example, a stranded wire conductor made by twisting a plurality of strands made of a tin-plated annealed copper wire or the like is used (for example, Patent Document 1). In particular, conductors used for cables that require bending resistance, such as cables for industrial robots, have dozens to hundreds of wires with a diameter of less than 0.1 mm (for example, about 40 to 500). Twisted stranded conductors are used.

Japanese Unexamined Patent Publication No. 2015-201322

Stranded wire conductors used for cables that require bending resistance, such as cables for industrial robots, are manufactured by twisting dozens to hundreds of strands with a stranded wire machine. When manufacturing this stranded conductor, it is necessary to set dozens to hundreds of bobbins around which the strands are wound in the stranded wire machine in the setup work before twisting the strands. In this setup work, as the number of strands used for the stranded wire conductor increases, the number of times the bobbin is set in the stranded wire machine also increases, so that the time and labor required for the setup work increases, resulting in poor work efficiency. Become.

Therefore, the present invention has been made in view of the above points, and an object of the present invention is to increase the number of strands when manufacturing a stranded conductor obtained by twisting dozens or more strands. Another object of the present invention is to provide a method for manufacturing a stranded conductor having good work efficiency in setup work.

One aspect of the present invention provides the following method for manufacturing a stranded conductor in order to achieve the above object.

[1] A method for manufacturing a stranded conductor in which several tens or more of the strands are twisted together, the bundled wire forming step of forming a bundled wire in which a plurality of the strands are bundled in an untwisted state, and the bundle. A method for manufacturing a stranded conductor, which includes a step of forming a collective stranded bundle wire in which a plurality of wires are collectively twisted to form a collective stranded bundle wire having several tens or more of the strands.
[2] Between the bundle wire forming step and the collective stranded bundle wire forming step, a bundle wire cutting step of cutting the bundled wire into a plurality of wires is included, and the bundled wires cut by the bundled wire cutting step are separated from each other. The method for producing a stranded wire conductor according to the above [1], wherein the stranded wire conductor is collectively twisted in the collective stranded cable tie forming step.
[3] The method for manufacturing a stranded wire conductor according to the above [2], wherein the bundled wire cutting step is to cut the bundled wire into a plurality of wires evenly.
[4] The method for manufacturing a stranded conductor according to the above [1] or [2], wherein the strand has a diameter of 0.1 mm or less.

According to the present invention, when manufacturing a stranded conductor obtained by twisting dozens or more strands, a method for manufacturing a stranded conductor having good setup work efficiency even if the number of strands increases is provided. can do.

It is a schematic cross-sectional view which shows an example of the stranded wire conductor which concerns on this embodiment. It is a schematic cross-sectional view which shows an example of the electric wire which concerns on this embodiment. It is explanatory drawing which shows the flow of the manufacturing method of the stranded wire conductor which concerns on this embodiment.

〔conductor〕
First, the stranded conductor according to the present embodiment will be described. FIG. 1 is a schematic cross-sectional view showing an example of a stranded conductor according to the present embodiment.

The stranded wire conductor 10 according to the present embodiment is formed by twisting a plurality of (for example, 40 or more and 500 or less) strands 1 composed of several tens or more. At this time, the plurality of strands 1 are in a state of being twisted by collective twisting. The strand 1 is composed of, for example, pure copper such as tough pitch copper or oxygen-free copper, or a copper wire made of a copper alloy in which these pure copper contains metal elements such as gold, silver, titanium, tin, and indium. NS. The copper wire constituting the strand 1 may have plating made of tin, silver, zinc or the like on the outer periphery thereof. Further, the strand 1 may be composed of an aluminum wire made of aluminum or an aluminum alloy, in addition to the copper wire.

The strand 1 has a circular cross section. The wire 1 having a circular cross section has a diameter of, for example, 0.1 mm or less, and preferably 0.07 mm or more and 0.09 mm or less. The strand 1 has such a diameter, so that when a stranded conductor 10 obtained by twisting a plurality of strands 1 is applied as a conductor of a cable for an industrial robot, the cable becomes two-dimensional or three-dimensional. It is effective in making it difficult to break even if it is bent. That is, the stranded wire conductor 10 formed by twisting a plurality of strands 1 is suitable as a conductor used in an industrial robot cable. The above diameter is the size in a state where the diameter of the copper wire or the aluminum wire includes the thickness of the plating when the circular wire 1 has the plating on the outer periphery of the copper wire or the aluminum wire.

In the stranded conductor 10, the number of strands 1 is, for example, 40 or more and 500 or less. In the stranded conductor 10, it is preferable that the strands 1 composed of these numbers are twisted at a twist pitch of 30 mm or more and 40 mm or less. In the stranded wire conductor 10, the strands 1 are twisted at such a twist pitch, so that the stranded wire conductor 10 in which the strands 1 are twisted is applied as a conductor of a cable for an industrial robot, and the cable is two-dimensional. It is possible to reduce the stress on the stranded conductor 10 and the cable that are applied when the stranded conductor 10 is bent three-dimensionally.

The stranded conductor 10 preferably has a conductivity of 97% IACS or more. Further, the stranded conductor 10 preferably has a tensile strength of 250 MPa or more. Since the stranded wire conductor 10 has such tensile strength, when the stranded wire conductor 10 is applied as a conductor of a cable for an industrial robot, the stranded wire conductor 10 breaks even if the cable is repeatedly bent in two or three dimensions. It can be made difficult. Therefore, the stranded conductor 10 is suitable as a conductor used in an industrial robot cable.

〔Electrical wire〕
FIG. 2 is a schematic cross-sectional view showing an example of an electric wire according to the present embodiment.

The electric wire 20 includes a stranded wire conductor 10 in which a plurality of (for example, 40 or more and 500 or less) strands 1 composed of several tens or more are twisted, an insulator 2 provided on the outer periphery of the stranded wire conductor 10. To be equipped. It should be noted that an inclusion such as a tape may be provided on the outer circumference of the stranded conductor 10. As the inclusions, a tape such as nylon tape is vertically attached along the longitudinal direction of the stranded conductor 10 or wound spirally.

The insulator 2 is made of, for example, a fluororesin. As the fluororesin, for example, a tetrafluoroethylene / ethylene copolymer (ETFE), a tetrafluoroethylene / hexafluoropropylene copolymer (FEP), and a tetrafluoroethylene / perfluoroalkyl vinyl ether copolymer (PFA) are preferable. be. The thickness of the insulator 2 is, for example, 0.2 mm or more and 0.4 mm or less.

The stranded conductor 10 preferably has a conductivity of 97% IACS or more. Further, the stranded conductor 10 preferably has a tensile strength of 250 MPa or more. Since the stranded wire conductor 10 has such tensile strength, when the stranded wire conductor 10 is applied as a conductor of a cable for an industrial robot, the stranded wire conductor 10 breaks even if the cable is repeatedly bent in two or three dimensions. It can be made difficult. Therefore, the stranded conductor 10 is suitable as a conductor used in an industrial robot cable.

[Manufacturing method of stranded conductor]
The method for manufacturing a stranded wire conductor according to the present embodiment is a method for manufacturing a stranded wire conductor in which a plurality of (for example, 40 or more and 500 or less) strands of several tens or more are twisted together. A bundle wire forming step of forming a bundled wire obtained by bundling the strands of a book in an untwisted state, and a collective twisting of a plurality of bundled wires to form a collective twisted bundled wire having several tens or more strands. Includes a bundle line forming step. Hereinafter, a method for manufacturing a stranded conductor according to the present embodiment will be described in detail.

FIG. 3 is an explanatory diagram showing a flow of a method for manufacturing a stranded conductor according to the present embodiment.

(Bundle line forming process)
In the bundle wire forming step S1, a plurality of strands are prepared, and the bundled wires are formed by bundling these plurality of strands in an untwisted state (a state in which the strands 1 are not twisted together). The number of strands is preferably 4 or more, and more preferably 10 or more. The number of strands can be changed as appropriate in consideration of the work efficiency of the setup work.

For example, in the bundle wire forming step S1, each wire having a circular cross section and a diameter of 0.1 mm or less (for example, 0.07 mm or more and 0.09 mm or less) is long (for example, 10,000 m or more). ), A plurality of bobbins (for example, about 4 to 25) are prepared. Next, the plurality of prepared bobbins are set in a stranded wire machine, and the plurality of strands drawn from each set bobbin are bundled into one without being twisted to form a bundled wire. For example, when 10 bobbins in which one wire is wound are prepared, these 10 bobbins are set in a stranded wire machine, and the 10 wires drawn from each of the set bobbins are connected to each other. Bundle into one without twisting. As a result, in the bundle wire forming step S1, a long bundle wire (for example, a length of 10,000 m or more) is formed.

The strands used in the bundle wire forming step S1 include, for example, pure copper such as tough pitch copper and oxygen-free copper, or copper containing metal elements such as gold, silver, titanium, tin, and indium in these pure copper. Copper wire made of alloy etc. is used. The copper wire may have plating made of tin, silver, zinc or the like on the outer periphery thereof. Further, the wire may be composed of an aluminum wire made of aluminum or an aluminum alloy, in addition to the copper wire.

(Cable tie cutting process)
In the bundle line cutting step S2, the bundle line formed in the bundle line forming step S1 is cut into a predetermined length. When separating the bundled wires, it is preferable to separate the bundled wires so that the lengths of the plurality of bundled wires after the separation are equal.

As an example, in the bundle wire cutting step S2, one bundle wire having a length of 30,000 m formed in the bundle wire forming step S1 is cut into pieces having a length of 1000 m, and each of the cut bundled lines is wound on a bobbin or the like. As a result, 30 bundled wires having the same length are obtained.

(Assembly twisted bundle wire forming process)
In the collective twisted bundle wire forming step S3, by collectively twisting a plurality of bundled wires obtained through the above-mentioned steps, a collective twisted bundle in which several tens or more of strands are collectively twisted. A line is formed.

More specifically, in the collective twisted bundle wire forming step S3, a bundle in which a plurality of (for example, four or more) strands having a predetermined length (for example, a length of 1000 m) are bundled in an untwisted state. Prepare a plurality of bobbins (for example, 10 or more) around which the wire is wound. Next, in the collective stranded bundle wire forming step S3, these prepared bobbins are set in the stranded wire machine, and a plurality of (for example, 10 or more) bundled wires are drawn from each of the set bobbins. Then, in the collective twisted bundle wire forming step S3, by collectively twisting the plurality of drawn bundled wires, a state in which the strands consisting of several tens or more (for example, 40 or more and 500 or less) are collectively twisted. Form a collective twisted bundled wire twisted together with.

As an example, in the collective stranded bundle wire forming step S3, 30 bobbins around which a bundle wire composed of 30 strands having a predetermined length (for example, a length of 1000 m) is wound are prepared. Next, in the collective stranded bundle wire forming step S3, 30 bundled wires are drawn from each of these prepared bobbins. Then, in the collective twisted bundle wire forming step S3, the 30 bundled wires drawn out are collectively twisted to produce a collective twisted bundled wire in which 300 strands are collectively twisted.

In the collective twisted bundle wire forming step S3, when a plurality of bundled wires are collectively twisted to form a collective twisted bundled wire, the twist pitch of the bundled wire is preferably 30 mm or more and 40 mm or less. In the collective twisted bundle wire forming step S3, the stress applied to the bundled wire at the time of collective twisting can be reduced by collectively twisting the bundled wires at such a twist pitch. Therefore, the stranded wire conductor obtained through the collective stranded bundle wire forming step S3 can easily obtain the characteristics (for example, conductivity, tensile strength, bending resistance, etc.) required for the conductor used for the industrial robot cable. ..

In the present embodiment, the above-mentioned bundle wire forming step S1 and the bundled wire separating step S2 may be performed on the same production line, or the bundled wire forming step S1 and the bundled wire separating step S2 are separate. It may be done on the production line. By performing these steps on the same production line, the production efficiency of the stranded conductor can be improved.

Further, in the present embodiment, the above-described method for manufacturing a stranded wire conductor has described an example including a bundled wire cutting step S2 for cutting the bundled wire, but the present invention is not limited to this, and is predetermined in the bundled wire forming step S1. By producing a plurality of bundled wires having a length of the above, the bundled wire cutting step S2 can be omitted as appropriate.

Further, in the present embodiment, the collective stranded bundled wire obtained in the collective stranded bundled wire forming step S3 may be used as it is as the stranded wire conductor, but if necessary, after undergoing a heat treatment step or other necessary steps. It may be used as a stranded wire conductor. For example, a composite stranded wire is formed by preparing a plurality of aggregate stranded bundled wires obtained in the collective stranded bundled wire forming step S3 and concentrically twisting the plurality of aggregated stranded bundled wires at a specific twist pitch. A wire forming step may be provided, and the composite stranded wire obtained by this composite stranded wire forming step may be used as a stranded wire conductor.

[Manufacturing method of electric wire]
In the method for manufacturing an electric wire according to the present embodiment, the stranded conductor is manufactured by the method for manufacturing a stranded conductor according to the above-described embodiment, and then the electric wire is formed by coating the outer periphery of the stranded conductor with an insulator. To manufacture. A resin such as fluororesin is used for the insulator. As the fluororesin, for example, a tetrafluoroethylene / ethylene copolymer (ETFE), a tetrafluoroethylene / hexafluoropropylene copolymer (FEP), and a tetrafluoroethylene / perfluoroalkyl vinyl ether copolymer (PFA) are preferable. be. By extruding a resin made of this fluororesin or the like to the outer periphery of the stranded wire conductor, an insulator having a predetermined thickness (for example, a thickness of 0.2 mm or more and 0.4 mm or less) is coated on the outer periphery of the stranded wire conductor. You can get the electric wire.

[Effect of this embodiment]
According to the present embodiment, in a method of manufacturing a stranded conductor composed of a plurality of (for example, 40 or more and 500 or less) strands composed of several tens or more by twisting them together, the plurality of strands Since it is possible to reduce the number of times (that is, the number of bobbins) that the bobbins around which the wires are wound are set in the stranded wire machine during the setup work before twisting the wires, the time and effort required for the setup work can be reduced. It can be reduced. Further, according to the present embodiment, it is possible to prevent the strands from extending along the longitudinal direction of the strands due to the strands being twisted a plurality of times and increasing the processing stress on the strands. Therefore, the obtained stranded conductor can have the characteristics (conductivity, tensile strength, bending resistance, etc.) required for the conductor used in the cable for an industrial robot.

Therefore, in the method for manufacturing a stranded wire conductor according to the present embodiment, even if the number of strands increases when manufacturing a stranded conductor in which a plurality of strands consisting of several tens or more are twisted ( For example, it is possible to obtain a stranded conductor having good setup work efficiency (even if the number of wires is 100 or more) and having characteristics suitable for use as a conductor of an industrial robot cable.

〔Example〕
In Table 1, the stranded wire conductor of sample No. 1 is composed of an aggregate stranded bundled wire having 300 strands (tin-plated copper wire) manufactured by the manufacturing method according to the present embodiment. Specifically, ten bobbins made of tin-plated copper wire having a circular cross section and a diameter of 0.08 mm are wound one by one to a length of 30,000 m. Next, in the bundle wire forming step, the prepared 10 bobbins are set in the stranded wire machine, and the 10 strands drawn from each of the set 10 bobbins are bundled into one without twisting. To form a bundled wire having a length of 30,000 m or more. Next, in the bundle wire cutting step, the bundled wire having a length of 30,000 m is divided into 30 equal parts every 1000 m, and each of the separated bundled wires is wound on a bobbin. Next, in the collective stranded bundle wire forming step, 30 bobbins around which a bundle wire consisting of 30 strands having a length of 1000 m is wound are set in the stranded wire machine, and from each of the set 30 bobbins. By pulling out 30 bundled wires and collectively twisting the 30 bundled wires drawn out at a twist pitch of 30 mm or more and 40 mm or less, 300 strands are twisted together in a state of collective twisting of 1000 m. A stranded bundled wire of length was formed to obtain a stranded wire conductor.

In Table 1, the stranded conductor of Sample No. 2 is an aggregate stranded wire produced by simply assembling and twisting 300 strands (tin-plated copper wire). Specifically, 300 bobbins made of tin-plated copper wire having a circular cross section and a wire having a diameter of 0.08 mm and being wound with a length of 1000 m are prepared. Next, the prepared 300 bobbins are set in the stranded wire machine, 300 strands are pulled out from each of the set 300 bobbins, and the 300 strands drawn out are assembled at a twist pitch of 30 m or more and 40 mm or less. By twisting, a collective stranded wire having a length of 1000 m was formed in which 300 strands were collectively twisted and twisted to obtain a stranded wire conductor.

In Table 1, the stranded wire conductor of Sample No. 3 is a composite stranded wire obtained by concentrically twisting a child stranded wire composed of 43 strands (tin-plated copper wire). Specifically, 43 bobbins made of tin-plated copper wire having a circular cross section and a wire having a diameter of 0.08 mm and being wound with a length of 1000 m are prepared. Next, these 43 bobbins are set in a stranded wire machine, strands are drawn from each of the set 43 bobbins, and the 43 strands drawn out are collectively twisted to form a child stranded wire. Next, seven bobbins around which the child stranded wires formed by the same method are wound are set in a stranded wire machine, and seven child stranded wires drawn from each of the set seven bobbins are concentrically twisted to form a parent. A stranded conductor was obtained by forming a stranded composite stranded wire.

In Table 1 below, the characteristics (elongation rate, conductivity, tensile strength), working efficiency, and fluororesin on the outer circumference of each stranded conductor of Samples Nos. 1 to 3 are shown. The results of evaluation of the bending resistance of the electric wire coated with the insulator made of the above are shown.

(Elongation)
In Table 1, the elongation rate was evaluated by performing a tensile test on the strands collected from each of the stranded conductors of Samples Nos. 1 to 3 by a method conforming to JIS C3002.

(conductivity)
In Table 1, the conductivity was evaluated by testing each stranded conductor of Sample Nos. 1 to 3 by a method conforming to JIS C3002.

(Tensile strength)
In Table 1, the tensile strength was evaluated by performing a tensile test on each of the stranded conductors of Samples Nos. 1 to 3 by a method conforming to JIS C3002.

(Work efficiency)
In Table 1, the working efficiency was evaluated by the number of times each bobbin on which the wire was wound was set in the stranded wire machine when manufacturing each stranded wire conductor of Samples Nos. 1 to 3.

(Bending resistance)
In Table 1, the bending resistance of various manufactured electric wires is subjected to a bending test (moving bending test) by a method based on JISC3306 and Appendix 1 Appendix Table 26 of Electrical Appliances, and attached to the test equipment. The number of times the wire reciprocated on the device before the wire was broken was measured and evaluated.

As shown in Table 1, the stranded conductor and the electric wire made of the collective stranded wire of Sample No. 1 are the stranded conductor and the electric wire made of the collective stranded wire of Sample Nos. 2 to 3 or the composite stranded wire. In comparison, it can be seen that the elongation, conductivity, tensile strength, and bending resistance are equal to or higher than each other. Further, the stranded conductor and the electric wire made of the aggregated stranded wire of the sample No. 1 are compared with the stranded conductor and the electric wire made of the aggregated stranded wire or the composite stranded wire of the sample Nos. 2 to 3. It can be seen that the number of times the bobbin is set on the machine is reduced, and the work efficiency of the setup work is improved.

Although the embodiments of the present invention have been described above, the present invention is not limited to the above embodiments, and various modifications can be carried out within a range that does not deviate from the gist of the invention.

Moreover, the embodiment described above does not limit the invention according to the claims. It should also be noted that not all combinations of features described in the embodiments are essential to the means for solving the problems of the invention.

1 Wire 2 Insulator 10 Stranded wire Conductor 20 Electric wire

Claims (6)

A bundle wire forming step of forming a bundle wire in which a plurality of strands plated on the outer circumference of a copper wire or an aluminum wire are bundled in an untwisted state.
By stranded collectively a plurality of said wire bundles, the combination twist wire bundle forming step of forming a combination twist wire bundle in which the wires to each other is twisted while being stranded collectively,
A method for manufacturing a stranded conductor including. Between the bundled wire forming step and the collective twisted bundled wire forming step, a bundled wire separating step of cutting the bundled wire into a plurality of wires is included, and the bundled wires separated by the bundled wire separating step are collectively twisted together. The method for manufacturing a stranded wire conductor according to claim 1, wherein in the bundle wire forming step, collective twisting is performed at a twist pitch of 30 mm or more and 40 mm or less. The method for manufacturing a stranded conductor according to claim 2, wherein the bundled wire cutting step is a method of cutting the bundled wire so as to divide the bundled wire into a plurality of wires evenly. The method for manufacturing a stranded conductor according to claim 1 or 2, wherein the strand has a diameter of 0.1 mm or less. The method for manufacturing a stranded conductor according to claim 1, wherein in the collective twisted bundle forming step, a plurality of the bundled wires are collectively twisted at a twist pitch of 30 mm or more and 40 mm or less. In the bundled wire, 4 or more and 25 or less of the strands are bundled in an untwisted state.
The method for manufacturing a stranded wire conductor according to claim 1, wherein the collective stranded bundled wire is twisted in a state in which 40 or more and 500 or less of the strands are collectively twisted.

Images