JPH07246298A - Terminal socket working method of wire-shaped body - Google Patents

Abstract

PURPOSE:To obtain a uniform product having improved fatigue resistance by expanding the other-side ends of plural pieces of wire-shaped bodies clamped at one-side ends in a socket having a tapered shape on the inside surface to form a spacer and diffusing and arranging the wire-shaped bodies, then injecting molten metal into a socket. CONSTITUTION:The one-side ends of the wire-shaped bodies 1 consisting of plural pieces of wires are fixed by a clamp 3. The ends 2 of the wire-shaped bodies are unraveled and the polyethylene coatings at the front ends 4 of the wire-shaped bodies are peeled and these ends are cold worked to a button head shape or a sleeve is subjected to compression molding to form the front ends 4 of the wire-shaped bodies to serve as a spacer. The ends 2 of the wire- shaped bodies correctly aligned by the spacer are withdrawn into the socket 6 having the tapered surface on the inside surface. A molten Zn98-Cu2% alloy is cast into the socket 6 from its opening end and is then taken out. As a result, the uniform product having the excellent fatigue resistance is obtd.

Description

Detailed Description of the Invention

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a method for processing a terminal socket of a linear body (parallel cable, wire rope, etc.) used in bridges and other civil engineering work.

[0002]

2. Description of the Related Art Conventionally, as a method of processing a terminal of a linear body such as a parallel wire cable or a wire rope, the terminal of the linear body is inserted into a socket whose inner surface is tapered, and at that time, the end of the wire is piped. It is general that plastic working by bending is applied using a small tool such as the above, and the molten metal is poured into the socket in a state where the wires are separated into brooms at appropriate intervals and fixed.

[0003]

In the above-mentioned conventional method, since the sensory and skillful work is the main task, the manufacturing process cannot be quantitatively controlled. If the wire is arranged in such a way that it does not exist, the porosity will not occur between the cast material and the wire, and the adhesive strength will not occur, and it will not be possible to exert the design strength, so a product of uniform quality cannot be made. .

Further, when the wire is bent by hand or broken into a broom, there is a portion where the wire is locally bent due to plastic deformation, and secondary bending stress occurs in this portion, which causes fatigue. There is a problem in that the strength is reduced.

The present invention is effective in solving the above-mentioned problems of the prior art, sufficiently maintaining the fixing property of the linear body, and remarkably improving the strength against a dynamic load as compared with the conventional one. An object of the present invention is to provide a method for processing a terminal socket of a linear body.

[0006]

In order to achieve the above object, the inventors of the present invention have conducted extensive studies, and as a result, at the end portion of the linear body on which the terminal socket is processed, The inventors have found that the adhesion with the cast material can be improved by maintaining a uniform interval, and have completed the present invention. That is, the present invention based on the above knowledge, the linear body is inserted into the socket whose inner surface is tapered, the clamp for restraining the wire is attached to the casting small diameter side base of the linear body, and the linear body A linear body characterized by forming spacers by bulging the ends, arranging the wires in the socket so that there are no bent corners, and then casting molten metal into the terminal socket. The terminal socket processing method of is the gist. The bulging portion may be a button head formed by cold working individual wires at the end of the linear body, or a short sleeve may be crimped to the individual wires at the end of the linear body. May be.

[0007]

The structure and operation of the present invention will be described with reference to the drawings. In the present invention, as shown in FIG. 4 (a), the linear body 1 coated with polyethylene is inserted into a socket 6 having an inner surface having a taper shape, and the length of the socket is approximately equal to the length of the tip 4 of the linear body. The portion 2 corresponding to the height is restrained by the clamp 3. Peel off the polyethylene coating from the clamped part.

Next, as shown in FIG. 4B, the tip portion 4 of the linear body is cold worked to form a button head 7 as a spacer at the tip portion 4 of each line at the end portion of the linear body. Or,
A short sleeve is pressure-bonded as shown in FIG. The end 2 of the processed linear body 1 has a parabolic shape or a conical shape by a clamp and a spacer. After removing impurities such as an oxide film from the individual parabolic or conical lines, the end portions of the linear body are placed inside a split Al alloy mold 5 having a conical cavity shown in FIG. 4 (c). Charge 2. As shown in FIG. 4 (d), a ridge capable of locking the button head of the linear body tip portion 4 is formed on the lower portion of the inner surface of the mold. A centering metal fitting is attached to the upper part of the mold so that the linear body is not eccentric.

The fixing Zn-Cu alloy molten metal is cast into the mold 5 in which the end 2 of the linear body 1 is charged as described above.
The thus-formed linear body socket insertion portion of FIG. 4 (e) is inserted into the socket 6 as shown in FIG. 4 (f), and the resin 8 is sealed around the outlet of the linear body for waterproofing. Sealed for sex.

Instead of the mold, a socket 6 is shown in FIG.
It is also possible to insert the end portion 2 of the linear body 1 so that the cavity has an inverted conical shape as shown in (b) and cast the fixing Zn-Cu alloy melt. In this case, for the purpose of completing the initial creep of the cast metal, the characteristics of the socket insertion portion of the linear body can be improved by pressing (compressing) the cast metal from the rear of the socket after casting.

The fixing member obtained by the present invention and the conventional product were cut along the line AA in FIG. 3 (a), and the wire arrangement in the section was observed. In the conventional product, as shown in Fig. 3 (c),
The wires are gathered on the outside of the socket cone, and in extreme cases, the wires come into contact with each other or the inner wall of the socket cone. This is due to the wire spraying work technique, and no two fusers of similar structure are available.

On the other hand, in the fixing member obtained according to the present invention, the wire is in the focused state as shown in FIG.
They are arranged in a rectangular shape, and all the wires are equidistant from each other. The distance between the inner wall of the socket and the wire bundle is also constant, and the wire bundle is located at the center of the socket cone. These are because the wire has the shape of an elastic wire of a cantilever when the mouthpiece is the fixed end and the opening is the free end.By changing the size of the spacer at the wire end, the wire spacing can be reduced. It shows that it can be managed freely.

[0013]

EXAMPLES Examples of the present invention will be described, but the present invention is not limited thereto. Example 1. Using a semi-parallel wire cable (SPWC) having a diameter of 5 mm × 37 pieces, a hexagonally-focused and PE-coated wire was produced in a completely parallel manner. Cut the wire to a length of 1.2 m and put 3
A 6 cm PE coated strip was formed and a socket with a length of 34 cm and an opening diameter of 14 cm was inserted. The boundary between the covering part and the removing part is clamped, and a button head that serves as a spacer is formed at the tip of the wire by cold working, then the opening side of the socket faces upward and the closing side (base part) is made of an inorganic fiber board, etc. Seal with. A runner is attached to the outer periphery of the socket, and a Zn98-Cu2% alloy for fixing the wire is cast from here. After this, the cast metal was pressed to complete the initial creep and finish the terminal socket.

The terminal socket of the present invention obtained in Example 1,
A durability test with a conventional product was conducted. Both of them were cast using the same lot of wires and n = 10 was tested (Fig. 5).
(See (a)). With the maximum stress at the same level of 82 kg / mm2, determine the stress range to be applied to each specimen, apply a stress load as shown in Fig. 5 (b), and apply 5% disconnection (2
The number of repetitions up to the main break) was measured. The final number of repetitions in the test was set to 2 million times. The results are shown in Table 1 and FIG.

[0015]

[Table 1]

The fatigue limit of the cable using the conventional Zn-Cu alloy casting fixing body was estimated to be about 15 kg / mm 2, but in the present invention, it was improved to about 35 kg / mm 2. The fatigue limit of the wire (single wire) that composes the cable is 4
It is about 0 to 45 kg / mm 2.

Example 2. The following method may be used as a method of casting the above-described cable. That is, according to the present invention, a terminal socket was processed using a Zn-Cu alloy for a semi-parallel wire cable (SPWC) having a diameter of 7 mm x 73. First, the diameter is 7 mm
73 steel wires are twisted together to create a wire, and PE is
A (polyethylene) coating was applied. This wire is cut into a length of, for example, 50 m, the PE coating having a length corresponding to the socket portions at both ends thereof is removed, and the socket is inserted. The boundary between the coating and the removal is clamped, and a button head that serves as a spacer is formed at the tip of the wire by cold working.After that, impurities such as oxide film are removed from each wire, and the wire is divided into two parts with a conical cavity. Attach the casting mold.
At this time, the wire is fixed to the mold by the centering metal fitting so that the spacer is locked to the convex strip on the bottom of the mold in order to prevent the displacement during casting. Zn9 for fixing the wire to the mold
Cast 8-Cu2% alloy. After this, the mold is removed and then fitted into a socket and the cast metal is pressed to complete the initial creep. Then, for waterproofing, resin was injected into the gap between the socket and the wire to finish the terminal socket.

[0018]

EFFECTS OF THE INVENTION Since the present invention is constructed as described above, the gap between the wires is surely secured in the socket, and the casting material for fixing is used to fix the linear body against the static tensile force. It is fully fixed. Also, in the past, since the wire was forcedly expanded into a broom shape by applying plastic deformation, secondary stress was generated in the socket wire, which caused fatigue disconnection, but due to the bulge at the wire tip and the wire restraint clamp, Since the wires can be arranged in a parabolic shape within the socket, there is no secondary stress concentration and the fatigue resistance is significantly improved. Further, since the gap between the wires can be quantitatively controlled by the bulging portion at the tip of the wire, a uniform product can be manufactured, which is extremely useful in industry.

[Brief description of drawings]

FIG. 1 is an explanatory diagram showing the production of a linear body terminal socket using a socket as a mold, (a) is a sectional view before casting, and (b) is a sectional view after casting.

2A and 2B show an embodiment of a terminal socket of a linear body obtained in the present invention, FIG. 2A is an overall sectional view, and FIGS. 2B and 2C are side views of examples of spacers at the tip of a wire.

3A and 3B are explanatory views showing a state of a wire in a socket, in which FIG. 3A is a vertical sectional view, and FIG. 3B is a sectional view taken along line AA in FIG. 3A of the linear terminal socket obtained by the present invention. Figure,
(C) is an AA sectional view in (a) of the conventional terminal socket.

FIG. 4 is a schematic explanatory view showing a manufacturing process according to an embodiment of the present invention in order of a first process (a) to a fifth process.

5A and 5B show an outline of a durability test of a linear terminal socket, FIG. 5A is a schematic diagram of a fatigue test sample, and FIG. 5B is an explanatory diagram of a fatigue test situation.

FIG. 6 is an explanatory diagram of fatigue test results corresponding to FIG.

[Explanation of symbols]

1 ... Linear body, 2 ... Linear body end part, 3 ...
Clamp, 4 ... Linear body tip, 5 ... Al alloy mold, 6 ... Socket, 8 ... Synthetic resin,

Claims (3)

[Claims] 1. A linear body is inserted into a socket whose inner surface is tapered, a clamp for restraining a wire is attached to a casting small diameter side base of the linear body, and a bulging process is applied to an end of the linear body. A method for processing a terminal socket of a linear body, comprising forming spacers, arranging the wires in the socket so that there are no bent corners, and then casting molten metal into the terminal socket. 2. The method for processing a terminal socket of a linear body according to claim 1, wherein the bulging portion at the end of the linear body is a button head formed by cold working. 3. The method of processing a terminal socket of a linear body according to claim 1, wherein the bulging portion at the end of the linear body is a sleeve formed by crimping.