JPH1092239A - Manufacture of twisted wire conductor and its manufacturing device - Google Patents

Abstract

PROBLEM TO BE SOLVED: To prevent strands from being loosened when machining is applied on the outer periphery of the twisted strands by expanding or shrinking the diameter of a die in response to the diameter of the strand. SOLUTION: Multiple strands are inserted into a die 4, and the strands are twisted into contact with each other. The prescribed gap G is provided between the upper and lower split die holders 5a, 5b. The upper die holder 5a is automatically moved downward or upward by a die holder lift mechanism 17, the imbalance of the strands is mitigated, and the inner diameter of the die 4 can be changed in response to the strand even if the diameter of the strand conductor is changed in the middle due to the tolerance of each strand. The inner diameter of the die 4 can be reduced after the abrasion of a die inner face 4c. The pressure to the strands is invariably kept nearly constant on the die inner face 4c, all strands are twisted in the uniform tension state, and the strands are prevented from being loosened when drawing is applied to strand conductors after they pass through a die finishing machine.

Description

DETAILED DESCRIPTION OF THE INVENTION

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a stranded conductor formed by twisting strands of a die so that the wires are in contact with each other, and more particularly to a method of manufacturing a stranded conductor and an apparatus for producing the same.

[0002]

2. Description of the Related Art FIG. 4 shows an embodiment of a conventional apparatus for manufacturing a stranded conductor. FIG. 6 shows a cross-sectional view of the stranded conductor obtained by the manufacturing apparatus of FIG.

As shown in FIGS. 4 and 6, a plurality of strands (for example, steel) 3 supplied from each bobbin 2 of a cage 1 are provided.
These are inserted into the die processing machine 24. Die processing machine 2
Reference numeral 4 denotes a die formed between dice holders (not shown) that can be divided into a plurality (for example, two in the vertical direction). In the dicing machine 24, the strands 3 are twisted to the extent that they come into contact with each other to form a stranded conductor 25, which is wound around a winder 31.

FIG. 5 shows another embodiment of a conventional apparatus for manufacturing a stranded conductor. FIG. 7 shows a cross-sectional view of the stranded conductor obtained by the manufacturing apparatus of FIG. The same members as those in FIG. 4 are denoted by the same reference numerals.

[0005] As shown in FIGS.
A plurality of strands (for example, steel materials) 3 supplied from the respective bobbins 2 are inserted into a dicing machine 24, and a watertight compound 8 is injected between the strands 3 and twisted to such an extent that they come into contact with each other. . A metal tape 26 is vertically attached to the outer periphery of the twisted element wire 3 and a forming machine 27.
And formed into a tube. The joint of the tubes is welded by a welding machine 28 to form a tube 26a. Thereafter, the tubing 26a is squeezed by the squeezing roll 29 to such an extent that the twisted strands 3 bite into the tubing 26a.
And wound up on a winder 31.

Here, by using a die at the time of twisting, the center of the twisting point can be centered. Also, by holding the wire 3 at the inner diameter of the die at the time of twisting, the wire 3
The unbalance of the tension of the wire 3 can be reduced by the frictional force between the wire and the die surface.

[0007]

In the case of the stranded conductor 25 shown in FIG. 6, the outer periphery of the stranded conductor 25 is subjected to processing such as tape winding or insulating coating in the next step after the strands 3 are twisted. It will be.

However, in the process of processing the outer periphery of the stranded conductor 25, there has been a problem that several strands 3 are loosened and processing is often impossible.

In the case of the stranded conductor 30 shown in FIG.
After the strands 3 are twisted, a tubing 26a is formed in tandem on the outer periphery of the twisted strands 3, and then the tubing 26a is reduced in diameter by the squeezing roll 29. In this case, there is a problem in that the wire 3 is loosened in accordance with the processing step, and a defective phenomenon such as crossing occurs in the wire 3.

FIG. 8 is an enlarged view of a main part of the die processing machine in FIG. 5 as viewed from the upstream side in the traveling direction of the strand.

Further, as shown in FIG. 8, substantially the same inner diameter R ₂ and stranded conductor 30, upper die 34a and lower die 34b
In the die 34 made of, the inner surface 34c of the die was worn according to the amount of processing when processing was repeated, and the effect of holding the wire 3 was weakened.

For this reason, at the time of twisting, the strands 3 twisted in a low tension state pass through the die 34 without being in good contact with each other, and the outer periphery of the twisted strands 3 is processed. As a result, the wire 3 is relaxed, and the "too much" 31 shown in FIG. 5 occurs.

Further, a similar phenomenon occurs when the wire 3 is twisted without correcting a "habit" such as a small bend.

SUMMARY OF THE INVENTION The present invention has been made to solve the above problems, and to provide a method for producing a stranded conductor in which the strand is not loosened even when the outer periphery of the stranded strand is processed, and an apparatus for producing the same. It is in.

[0015]

According to a first aspect of the present invention, a plurality of wires are inserted into a die and twisted to such an extent that the wires come into contact with each other. In the method for manufacturing a stranded wire conductor, the dies are formed by a plurality of divided die holders, and a predetermined gap is formed in each gap of the dies holder, and the diameter of the dies is enlarged or reduced according to the diameter of the stranded wire. The wire is twisted.

According to a second aspect of the present invention, there is provided the method for manufacturing a stranded conductor according to the first aspect, wherein the die is formed by a die holder divided into two vertically.

According to a third aspect of the present invention, there is provided a method of manufacturing a stranded conductor in which a plurality of strands are inserted into a die and twisted to such an extent that the strands come into contact with each other. Along with forming the divided die holder, a predetermined gap is formed in each gap of the die holder, the above-mentioned wire is inserted into the die, a watertight compound is injected between the wires, and the diameter of the die is reduced. Is expanded or contracted according to the diameter of the stranded wire, and the strands are twisted,
The surplus watertight compound protruding from between the wires and staying in the gap is forcibly discharged out of the die.

According to a fourth aspect of the present invention, there is provided an apparatus for manufacturing a stranded conductor in which a plurality of strands are inserted into a die and twisted to such an extent that the strands come into contact with each other. It is formed by a divided die holder and a predetermined gap is formed in each gap of the die holder.

A fifth aspect of the present invention is an apparatus for manufacturing a stranded conductor in which a plurality of strands are inserted into a die and twisted to such an extent that the strands come into contact with each other. It is formed of divided die holders, and has a discharge means for forming a predetermined gap in each gap of the die holder and forcibly discharging excess watertight compound staying in the gap out of the die.

According to a sixth aspect of the present invention, there is provided the apparatus for manufacturing a stranded conductor according to the fourth or fifth aspect, further comprising detecting means for detecting the amount of wear on the inner surface of the die.

According to a seventh aspect of the present invention, the discharge means comprises an air nozzle fixed from the front side of the die toward the gap and a discharge groove formed in the die holder. It is an apparatus for manufacturing a wire conductor.

According to the above construction, in a method for manufacturing a stranded conductor in which a plurality of strands are inserted into a die and twisted to such an extent that the strands come into contact with each other,
Since the above-mentioned dies were formed by a plurality of divided die holders, a predetermined gap was formed in each gap of the die holder, and the strands were twisted by expanding and contracting the diameter of the dies according to the diameter of the stranded wire, Even if the outer periphery of the twisted wire is processed, a stranded wire conductor in which the wire does not relax can be obtained.

[0023]

Embodiments of the present invention will be described below.

FIG. 1 shows a partially cutaway view of the die processing machine in the apparatus for manufacturing a stranded wire conductor according to the present invention, as viewed from the upstream side in the element wire traveling direction. FIG. 2 shows a top view of FIG. FIG. 3 is an enlarged view of a main part of the die in FIG.

As shown in FIGS. 1 and 2, the die processing machine comprises a die holder 5, a discharging means, a die 4, and a die holder lifting mechanism 17.

The die holder 5 comprises an upper holder 5a and a lower holder 5b. Grooves 5d, 5e having a semicircular cross section are formed in the element wire traveling direction (the direction perpendicular to the paper surface of FIG. 1, the vertical direction of FIG. 2) on the lower surface of the upper holder 5a and the upper surface of the lower holder 5b. Line-symmetrically (two in the figure) across the grooves 5d and 5e, and the upper holder 5a
And, a through hole 18 is formed in the vertical direction of the lower holder 5b. A predetermined gap G is provided between the upper holder 5a and the lower holder 5b, and keys 14 are fixedly provided at the upper part of the groove 5d and the lower part of the groove 5e.

Each through hole 1 on the lower surface of the lower holder 5b
8, a first counterbore 18a having a predetermined depth is formed;
A second counterbore 18b is formed at a predetermined depth and diameter in each through hole 18 on the upper surface of the upper holder 5a, and a part of the second counterbore 18b is formed into a third counterbore having a larger diameter than the second counterbore 18b. It is formed in the counterbore 18c.

The discharge means is shallow along both sides of the groove 5e on the upper surface of the lower holder 5b and at the front (lower part in FIG. 2) of the lower holder 5b and at the rear part (upper part in FIG. 2) of the lower holder 5b. And discharge nozzles 15, 15, which are formed to be inclined so as to be deeper, and air nozzles 16, 1, which are fixed to the front surface of the die holder 5 toward the gap G.
6

The die 4 includes an upper die 4a and a lower die 4b.
Made, the die inner surface 4c forms a inner diameter R ₁ in a state having a gap G between the upper die 4a and the lower die 4b as shown in FIG. The dies 4a and 4b are provided to be fitted in the grooves 5d and 5e and the keys 14 and 14, respectively.

The die holder raising / lowering mechanism 17 includes a bolt 6, a slide bush 7, a spiral spring 10, and a double nut 12.

Each bolt 6 provided through each through hole 18 of the die holder 5 has a shaft portion 6b, a bolt top portion 6a having a larger diameter than the shaft portion 6b, and a smaller diameter than the shaft portion 6b.
And it is composed of a bolt rear end 6c having a thread groove formed at the front end.

The bolt tops 6a are buckled at the first counterbore portions 18a of the respective through holes 18, and the shaft portions 6b of the respective bolts 6 and the second counterbore portions 18 of the respective through holes 18 having a diameter larger than the shaft portion 6b.
A cylindrical slide bush 7 is provided in the gap between the slide bush 7 and the slide bush 7. On the inner surface of the slide bush 7, a bearing 7a is arranged so as to roll freely.

Each through hole 1 in the upper surface of the upper holder 5a
8 includes a second counterbore 18b and a third counterbore 18c.
And a holding cap 8 is provided. A through hole is formed at the center of the holding cap 8 to fit with the shaft 6b and the rear end 6c of each bolt 6, and a plurality of holes for inserting a flat head screw 9 are formed at the periphery thereof. Individually formed.

A washer 11a, a spiral spring 10, and a bolt rear end 6c protruding above the upper holder 5a.
And the washer 11b are inserted and provided, and the double nut 12 is screwed into the screw groove at the tip of the bolt rear end 6c.

On the upper surface of the upper holder 5a, a dial gauge (detection means) 1 for detecting the amount of wear on the inner surface of the die is provided.
3 is provided.

The die machine in the apparatus for manufacturing a stranded conductor according to the present invention uses a spring mechanism as the die holder elevating mechanism 17 for vertically moving the upper holder 5a, but is not particularly limited thereto. For example, a pressure system using a fluid such as air pressure or hydraulic pressure may be used.

Next, the method of the present invention will be described.

Using the above-mentioned die processing machine, a plurality of strands are inserted into the die 4 and twisted to the extent that the strands contact each other on the inner surface 4c of the die 4.

Here, when the die processing machine is continuously used, the inner surface 4c of the die may be gradually worn or the used wires may have a negative tolerance. At this time, a gap G is provided between the upper holder 5a and the lower holder 5b, and a bearing 7a is rotatably disposed on the inner surface of the slide bush 7 disposed on each second counterbore 18b of the upper holder 5a. Therefore, there is almost no friction between the shaft portion 6b of each bolt 6 and each slide bush 7, and the entire upper holder 5a can easily follow and move downward.

Further, when the die processing machine is continuously used, the used wire may have a positive tolerance. At this time, as described above, the shaft 6
There is almost no friction between b and each slide bush 7, and the entire upper holder 5a can easily follow and move.
Here, on the upper surface of the upper holder 5a, a spiral spring 10 is inserted through a bolt rear end 6c of each bolt 6 protruding from the upper holder 5a to constantly press the stranded conductor, so that the upper conductor 5a is used. When the positive tolerance of the strands disappears, the entire upper holder 5a moves down again due to the repulsion of the spiral spring 10.

That is, since the upper holder 5a, which is vertically movable by the die holder raising / lowering mechanism 17, is automatically moved down or up and down, the unbalance of the strands is relaxed, and the tolerance of each strand is determined by ± tolerance. stranded even conductor diameter varies in the course can vary the inner diameter R ₁ of the die 4 in accordance with the stranded conductor diameter, it is possible to follow under dynamic wear of the die inner surface 4c of the die 4. Thereby, the pressing of each wire on the inner surface 4c of the die becomes almost constant, all the wires are twisted in a uniform tension state, and even if the stranded wire conductor after the passing through the dicing machine is drawn. Each strand is never slack.

In order to prevent water running by simultaneously injecting a watertight compound when the strand is inserted into the die 4, the excess watertight compound is removed by the upper holder 5 a.
If it stays between the upper holder 5a and the lower holder 5b, it will prevent the upper holder 5a from moving down or up and down.

For this purpose, discharge grooves 15 are formed on the upper surface of the lower holder 5b, and air is sprayed toward the gap G from the air nozzles 16 provided on the front surface of the die holder 5. As a result, excess watertight compound staying between the upper holder 5a and the lower holder 5b is forcibly discharged. The excess watertight compound that has been forcibly discharged is collected through the discharge grooves 15 and returned to the original tank. At this time, it is needless to say that, when the air is sprayed with the tips of the air nozzles 16 facing the discharge grooves 15, the twisting of the stranded wires is not affected, and the watertight compound can be easily separated.

In the die processing machine in the apparatus for manufacturing a stranded conductor of the present invention, the die 4 and the die holder 5 may be kept warm and heated in order to further stabilize the flow of the watertight compound in the gap G. Needless to say.

[0045]

【Example】

(Example) A strand made of a steel wire having a tensile strength of 210 kgf / mm ² was twisted with a die having a gap of 0.4 mm and a die inner diameter of 9.53 mm as shown in FIG.
A 2 mm stranded conductor was produced.

(Comparative Example) Tensile strength is 210 kgf / mm ²
Was stranded with a die having an inner diameter of 9.53 mm as shown in FIG. 8 to produce a stranded conductor having a diameter of 9.522 mm.

In the die of the embodiment, the pressure applied to the die holder is approximately 754 kgf, and a substantially constant pressing force is always applied to the stranded conductor.
Further, there is no limitation on the amount of work until the stranded wire conductor becomes slack, and the stranded wire conductor does not slack while using the dicing machine.

On the other hand, in the die of the comparative example, although the pressure applied to the die holder shows a high value at first, it decreases with the continuous use of the die processing machine.
The pressure on the stranded conductor varies with the amount of work. Also,
2,000m of work before loosening occurs in the stranded conductor
The twisted conductor becomes loose immediately after the start of the work.

[0049]

In summary, according to the present invention, the upper holder, which is vertically movable by the die holder raising / lowering mechanism, automatically moves down or up and down, so that the pressing of each wire on the inner surface of the die is always performed. It is almost constant, all the strands are twisted in a uniform tension state, and even if the outer periphery of the twisted strands is processed, an excellent effect that the strands are not loosened is exhibited.

[Brief description of the drawings]

FIG. 1 is a partially cutaway view of a dicing machine in a production apparatus for a stranded wire conductor according to the present invention when viewed from an upstream side in a strand traveling direction.

FIG. 2 is a top view of FIG.

FIG. 3 is an enlarged view of a main part of the dice in FIG.

FIG. 4 is a line process diagram showing an embodiment of a conventional apparatus for manufacturing a stranded conductor.

FIG. 5 is a line process diagram showing another embodiment of a conventional apparatus for manufacturing a stranded conductor.

6 is a cross-sectional view of a stranded conductor obtained by the manufacturing apparatus of FIG.

FIG. 7 is a cross-sectional view of a stranded conductor obtained by the manufacturing apparatus of FIG. 5;

8 is an enlarged view of a main part of the die processing machine in FIG. 5 as viewed from an upstream side in a traveling direction of a strand.

[Explanation of symbols]

 Reference Signs List 3 strand 4 dice 4a upper die 4b lower die 4c inner surface of die 5 die holder 5a upper holder 5b lower holder 13 dial gauge (detection means) 15,15 discharge groove 16,16 air nozzle G gap

Claims (7)

[Claims] 1. A method for manufacturing a stranded conductor in which a plurality of strands are inserted into a die and twisted to such an extent that the strands come into contact with each other, the die is divided into a plurality of die holders. While forming, a predetermined gap is formed in each gap of the die holder,
A method for manufacturing a stranded conductor, comprising: expanding and reducing a diameter of a die according to a diameter of a stranded wire; 2. The method for manufacturing a stranded conductor according to claim 1, wherein said die is formed by a die holder divided into two in a vertical direction. 3. A method for manufacturing a stranded conductor in which a plurality of strands are inserted into a die and twisted to such an extent that the strands come into contact with each other, the die is divided into a plurality of die holders. While forming, a predetermined gap is formed in each gap of the die holder,
Insert the strands into the dies, inject a watertight compound between the strands, expand and reduce the diameter of the die according to the diameter of the strands, twist the strands, protrude from between the strands, and A method for forcibly discharging excess watertight compound remaining in the gap out of the die. 4. An apparatus for manufacturing a stranded conductor in which a plurality of strands are inserted into a die and twisted to such an extent that the strands come into contact with each other, the die is divided into a plurality of die holders. And a predetermined gap is formed in each gap of the die holder. 5. An apparatus for manufacturing a stranded conductor in which a plurality of strands are inserted into a die and twisted to such an extent that the strands come into contact with each other, wherein the die is divided into a plurality of die holders. While forming, a predetermined gap is formed in each gap of the die holder,
An apparatus for manufacturing a stranded conductor, comprising: a discharge means for forcibly discharging surplus watertight compound staying in the gap out of the die. 6. The apparatus for manufacturing a stranded conductor according to claim 4, further comprising detecting means for detecting an amount of wear on the inner surface of the die. 7. The discharge means comprises an air nozzle fixed from the near side of the die toward the gap and a discharge groove formed in the die holder.
An apparatus for manufacturing the stranded conductor according to the above.