JP3020404B2 - Terminal socket processing method for linear body - Google Patents

Description

DETAILED DESCRIPTION OF THE INVENTION

[0001]

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

[0002]

2. Description of the Related Art Conventionally, as a method of processing a terminal socket of a linear body such as a parallel cable and a wire rope, a terminal of the linear body is inserted into a socket having an inner surface tapered, and then the terminal of the wire is piped. Generally, plastic working by bending is performed by using a prop such as the above, and molten metal is poured into a socket in a broom-like shape at an appropriate interval and fixed.

[0003]

In the above-mentioned conventional method, since the sensory and skilled work is mainly performed, the production process cannot be quantitatively controlled, so that the casting material cannot enter the gap between the wires. If the wire arrangement is not performed, cavities will be generated between the cast material and the wire, adhesion will not occur, and it will not be possible to exert the design strength, so it will not be possible to produce a uniform product in quality .

[0004] When the wire is bent into a broom by bending by hand, there is a portion where the wire is locally deformed due to plastic deformation, and secondary bending stress is generated in this portion, resulting in fatigue. There is a problem that the strength is reduced.

The present invention solves the above-mentioned problems of the prior art, is effective in maintaining sufficient fixability of the linear body, and significantly improving the strength against a dynamic load as compared with the conventional one. It is an object of the present invention to provide a method of processing a terminal socket of a linear object.

[0006]

Means for Solving the Problems In order to achieve the above object, the present inventors have conducted intensive studies and as a result, at the end of the linear body to be subjected to terminal socket processing, the individual lines of the linear body have been formed. The inventor has found that by maintaining a uniform spacing, the adhesion to the cast material can be improved, and the present invention has been completed. That is, the present invention based on the above-mentioned knowledge, the linear body is inserted into a socket whose inner surface is tapered, and a clamp that restrains the wire is attached to the base of the linear body on the small-diameter side of the casting. Forming a spacer by bulging the end, arranging the wires in the socket so that there is no bent portion, and then casting a molten metal into the terminal socket. Of the terminal socket processing method. The bulging working portion in this case is a button head formed by the individual wires of the linear body end formed by cold working.

[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 member 1 coated with polyethylene is inserted into a socket 6 having an inner surface tapered, and the length of the socket is substantially increased from the distal end portion 4 of the linear member. The portion 2 corresponding to the above is restrained by the clamp 3. Peel off the polyethylene coating from the clamped area.

Next, as shown in FIG. 4 (b), the distal end 4 of the linear body is cold-worked, and the distal end 4 of each wire at the linear end is used as a spacer as shown in FIG. 2 (b). form a button head 7 and so on. The end 2 of the processed linear body 1 is formed into a parabolic or conical shape by a clamp and a spacer. After removing impurities such as oxide films from the individual lines of the parabolic or conical shape, the end of the linear body is placed inside a split Al alloy mold 5 having a conical cavity shown in FIG. Charge 2. Fig. 4
As shown in (d), a ridge that can lock the button head of the linear end portion 4 is formed. A centering metal fitting is attached to the upper part of the mold so that the linear body is not eccentric.

As described above, a molten Zn—Cu alloy is cast into the mold 5 in which the end 2 of the linear body 1 is inserted.
4 (e) is inserted into the socket 6 as shown in FIG. 4 (f), and a resin 8 is sealed around the outlet of the linear body to be waterproof. Sealed for sex.

A socket 6 is used in place of the mold, as shown in FIG.
As shown in (b), the end 2 of the linear body 1 can be inserted so that the cavity has an inverted conical shape, and a molten Zn—Cu alloy can be cast. In this case, for the purpose of completing the initial creep of the cast metal, after casting, the cast metal is pressed (compressed) from the rear of the socket, so that the characteristics of the socket insertion portion of the linear body can be improved.

The fixing body obtained according to the present invention and the conventional product were cut along the line AA in FIG. 3A, and the wire arrangement in the cross section was observed. In the conventional product, as shown in FIG.
Wires are gathered outside 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 technique, and no two fusers have the same structure.

On the other hand, in the fixing body obtained according to the present invention, the wires are in a focused state as shown in FIG.
The wires are arranged in a square shape, and all the wires are separated by an equal distance. The distance between the socket inner wall 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 a cantilever elastic wire when the base part is the fixed end and the opening part is the free end.By changing the size of the spacer at the wire end, the wire spacing is It shows that you can manage it freely.

[0013]

EXAMPLES Examples of the present invention will be described, but the present invention is not limited by these examples. Embodiment 1 FIG. A semi-parallel wire cable (SPWC) having a diameter of 5 mm × 37 was used to produce a PE-coated wire bundled in a completely parallel hexagonal shape. The wire is cut to a length of 1.2 m, and 3
A 6 cm PE peeling portion was formed, and a socket having a length of 34 cm and an opening diameter of 14 cm was inserted. After the boundary between the covering part and the removing part is clamped and a button head serving as a spacer is formed at the wire tip by cold working, the opening side of the socket is turned upward, and the closed side (the base part) is made of an inorganic fiber board or the like. Seal with. A runner is provided on the outer periphery of the socket, and a Zn98-Cu 2% alloy for fixing the wire is cast from here. Thereafter, the cast metal was pressed to complete the initial creep and finish the terminal socket.

[0014] The terminal socket of the present invention obtained in Example 1,
A durability test with a conventional product was performed. Both samples were cast using wires of the same lot, and n = 10 specimens (FIG. 5).
(A)). The maximum stress was set to the same level of 82 kg / mm 2, the stress range applied to each specimen was determined, and a stress was applied as shown in FIG.
The number of repetitions up to the main fracture) was measured. The final number of repetitions in the test was 2 million times. The results are shown in Table 1 and FIG.

[0015]

[Table 1]

Although the fatigue limit of a cable using a conventional Zn-Cu alloy cast and fixed body was estimated to be about 15 kg / mm 2, it was improved to about 35 kg / mm 2 in the present invention. The fatigue limit of the wire (single wire) constituting the cable is 4
It is about 0 to 45 kg / mm2.

Embodiment 2 FIG. The following method may be used as a method of casting the cable as described above. That is, according to the present invention, a terminal socket was formed on a semi-parallel wire cable (SPWC) having a diameter of 7 mm × 73 using a Zn—Cu alloy. First, 7mm in diameter
The steel wire is made by twisting 73 steel wires of
A (polyethylene) coating was applied. The wire is cut to a length of, for example, 50 m, the PE coating of a length corresponding to the socket portions at both ends is removed, and the socket is inserted. After the boundary between the covering portion and the removing portion is clamped and a button head serving as a spacer is formed at the tip of the wire by cold working, impurities such as an oxide film are removed from each wire, and a split having a conical cavity is formed. Attach the casting mold.
At this time, the wire is fixed to the mold by a centering metal fitting so that the spacer is engaged with the ridge on the bottom of the mold to prevent displacement during casting. Zn9 for wire fixing to the mold
An 8-Cu 2% alloy is cast. After this, the mold is removed, fitted into the socket, and the cast metal is pressed to complete the initial creep. The terminal socket was finished by injecting resin into the gap between the socket and the wire for waterproofing.

[0018]

Since the present invention is constructed as described above, the gap between the wires is securely ensured in the socket, and the fixing casting material is used to fix the linear body against the static tensile force. Fixation is sufficiently performed. Previously, the wire was forcibly expanded in a broom shape by applying plastic deformation, so secondary stress was generated in the socket wire, causing fatigue disconnection. Since the wires can be arranged in a parabolic shape in the socket, there is no secondary stress concentration, and the fatigue resistance is remarkably improved. Further, since the gap between the wires can be quantitatively managed 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 the drawings]

BRIEF DESCRIPTION OF THE DRAWINGS FIG. 1 is an explanatory view showing the manufacture of a terminal socket of a linear body using a socket as a mold, wherein (a) is a sectional view before casting and (b) is a sectional view after casting.

Figure 2 shows an embodiment of a terminal socket of the resulting linear body in the present invention, (a) the entire cross-sectional view, the (b) is a side view of an example of a wire tip of the spacer.

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

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

FIG. 5 shows an outline of a durability test of a linear terminal socket, (a) is a schematic diagram of a fatigue test sample, and (b) is an explanatory diagram of a state of the fatigue test.

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

[Explanation of symbols]

1 ... linear body, 2 ... end of linear body, 3 ...
Clamp, 4 ... tip of linear body, 5 ... mold made of Al alloy, 6 ... socket, 8 ... synthetic resin,

Claims (1)

(57) [Claims] 1. A linear body is inserted into a socket whose inner surface is tapered, and a clamp for restraining a wire is attached to a base of the linear body on a small-diameter side of the casting, and a cold end is attached to an end of the linear body.
Button as spacer by bulging processing based on processing
A method of processing a terminal socket for a linear body, comprising: forming a head , arranging wires in the socket so that no bent portions exist, and then pouring a molten metal into the terminal socket.