JP2534266B2 - Method for manufacturing winding body for wind noise prevention of electric wire - Google Patents

Description

DETAILED DESCRIPTION OF THE INVENTION [Field of Industrial Application] The present invention is for wind noise prevention of an electric wire, which is wound around an electric wire such as an overhead bare electric wire or an overhead insulated electric wire in a spiral shape to prevent wind noise of the electric wire. The present invention relates to a method for manufacturing a wound body.

[Conventional technology and its problems]

When wind blows on the electric wire, a Karman vortex is generated behind the electric wire, which causes wind noise. Conventionally, as means for preventing wind noise of this type of electric wire, a winding body having a circular cross section made of metal or the like is spirally wound around the outer circumference of the electric wire, thereby deforming the outer wire method along the longitudinal direction, There is a method to prevent wind noise by disturbing the Karman vortex generated behind the electric wire. Since this winding body has a circular cross section, a gap is formed between the winding body and the surface of the electric wire, and there is a possibility that wind blows on the gap portion to generate noise. Therefore, a parasitic wound body having a substantially triangular cross section has been developed (Japanese Patent Application No. 57-47951). Since this winding body has a substantially triangular cross section, it does not generate noise due to close contact with the wire surface.
Further, since it is made of plastic, it has a desired result such as a light weight and a small load applied to the electric wire.

However, since it is made of plastic, its strength is low and the gripping force when wound around an electric wire is smaller than that of metal, and its viscoelasticity is large, which causes another problem such as tilting of the wound body. Came. Further, in the conventional method of manufacturing the wound body, there is a problem that the process is complicated and the cost is high because the manufacturing is performed by usual casting, hot rolling and wire drawing.

[Problems to be solved by the invention]

The present invention, as a result of studying the above-mentioned problems, is capable of preventing the occurrence of wind noise, has high strength, and is light in weight and excellent in corrosion resistance. Wind noise preventing wound body is continuously cast and rolled by a rotary wheel type continuous extruder. We have developed a manufacturing method that continuously manufactures and simplifies the process while improving its characteristics.

[Means and Actions for Solving Problems]

According to the present invention, an alloy consisting of Mg 0.3 to 1.4 wt%, Si 0.3 to 1.4 wt%, Fe or / and Cu 1.0 wt% or less, and the balance Al is used as a raw material by continuous casting and rolling, and then a rotary wheel type continuous Using an extruder, at a temperature of 400 to 570 ° C, extrusion molding continuously having a cross-sectional shape of a substantially triangular shape, and immediately followed by rapid cooling to 150 ° C or less, a method for producing a winding body for wind noise prevention of electric wires Is the first invention, and Mg0.3-1.4wt%, Si0.3-1.4wt
%, Fe or / and Cu 1.0wt% or less, the balance Al is made into a raw material by continuous casting and rolling, and then the cross-sectional shape is continuously obtained at a temperature of 400 to 570 ° C using a rotary wheel type continuous extruder. The second invention is a method for manufacturing a wind noise preventing wound body, which comprises extruding into a substantially triangular shape, and then immediately quenching it to 150 ° C. or lower and subjecting it to surface reduction processing of 20% or more. is there.

That is, according to the present invention, a long material is produced by continuously casting and rolling an alloy in which Mg and Si are added to Al and further Fe or / and Cu is added, and the cross-sectional shape is made substantially triangular by a rotary wheel type continuous extruder. This is a manufacturing method in which the material is extruded, quenched to improve its strength, and if necessary, further cold worked to increase its strength. However, Mg and Si of the target alloy of the present invention are both elements that improve the tensile strength, and if the content is less than 0.3 wt%, the effect is small, and if it exceeds 1.4 wt%, the formability after extrusion becomes poor and during molding. This is because it is easy to break. Further, Fe and Si enhance strength such as gripping force, and also have an effect of promoting solid solution of Mg and Si during extrusion and quenching. However, alone or when the total amount exceeds 1 wt%, the corrosion resistance decreases.

The above-mentioned alloy is used as a raw material by continuous casting and rolling in order to continuously produce a long raw material. However, for the purpose of merely obtaining a long material, other methods such as ordinary extrusion and spreading can be applied. The material is continuously extruded into a triangular shape with a rotating wheel type continuous extruder at a temperature of 400-500 ° C, and immediately after that, it is rapidly cooled to 150 ° C or less by the continuous extrusion process. In addition, this is because a material in which Mg and Si are sufficiently solid-dissolved is obtained, and when the extrusion temperature is lower than 400 ° C, Mg and Si are not sufficiently solid-dissolved, and when it exceeds 570 ° C, the material becomes brittle due to burning or the like.
Also, cooling immediately after is for the purpose of sufficient quenching.
This is because if the temperature exceeds 0 ° C, coarse precipitates of Mg and Si will be generated and sufficient strength cannot be obtained. Next, extruding with a triangular cross-section is for obtaining a long profile at once, and it is possible to drastically reduce the number of multi-pass wire drawing and processes using a conventional profile die. Further, the surface reduction processing of 20% or more after quenching is performed when more strength is required, and improves the gripping force, but if it is less than 20%, its effect is small.

Next, the wound body obtained in the present invention has a substantially triangular cross-sectional shape. For example, as shown in FIG. 1, the wound body (1) has a substantially triangular cross-section and the base ( 2) is concavely curved, and the top portion (3) has an arcuate chamfered shape. The height (h) is 1/2 of the base length (L)
That is all. As shown in FIG. 2, the above-mentioned wound body is used by spirally winding it on the outer circumference of the electric wire (4). In this case, the wound body (1) is spiraled in the left direction. The molded product and the molded product in the right-hand spiral shape are alternately wound.

The above-mentioned wound body has a good formability when wound around an electric wire, and has a remarkably excellent gripping force after winding due to the conventional metal or plastic and has a high durability. The cross section is generally triangular, and the bottom side is curved in a concave shape, so the adhesion to the wire is good and there is no air gap between the winding body and the wire surface, and no sound is emitted. do not do. Also, set the height of the wound body to 1/2 of the bottom length.
According to the above, the shape of the electric wire along the longitudinal direction can be greatly changed, so that the Karman vortex generated when the electric wire is blown with wind can be efficiently disturbed, and wind noise can be reliably prevented. Therefore, the present invention continuously manufactures the wound body having the above-mentioned excellent characteristics, and the manufacturing process is remarkably simplified and the manufacturing cost is remarkably reduced. The wound body obtained by the present invention can also be applied to prevent corona noise by subjecting it to a hydrophilic treatment.

〔Example〕

 An embodiment of the present invention will be described below.

Aluminum ingot with 99.6% purity and Al-20% Si mother alloy, Al-
Alloys of various compositions shown in Table 1 were melted using a 50% Cu master alloy and Mg alone. After melting, a belt-and-wheel type continuous casting machine was used to cast into a trapezoidal ingot having a cross-sectional area of 2000 m ² , and hot rolling was performed without reheating to obtain a material having a diameter of 15 mmφ. The composition is shown in Table 1.

This material was continuously extruded into a triangular shape corresponding to 7.8 mmφ by a rotary wheel type extruder under various conditions shown in Table 2 and then quenched to obtain a material. This part was further cold worked.

The tensile strength of the above sample was measured with an Instron type tension tester, and the gripping force was 410 / as shown in Fig. 3.
Wrap the sample winding body (1) on the surface of the ACSR electric wire (4) of mm ² and fix the electric wire with the fixture, and pull the winding body with the clamp (6) to pull the electric wire and the winding body. The slip generation load between was measured. Regarding the corrosion resistance, a sulfurous acid gas test was performed and the weight loss rate after 40 days was expressed. The results are shown in Table 2.

As is clear from Table 2, No. 1 obtained by the present invention
Nos. 9 to 9 show excellent properties in all of tensile strength, gripping force and corrosion resistance, as compared with the conventional metal having a circular cross section. It is also seen that the gripping force is twice as high as that of the conventional plastic one.

In the comparative example, since No. 10 has a low Mg content, the gripping force is small even if the strength is increased by processing.

 No. 11 has little Si and has low strength and gripping force.

No. 12 has much Mg and Si, so it cannot be processed into a wound body.

 No. 13 has a large amount of Fe and thus has poor corrosion resistance.

 No. 14 has a large amount of Cu, so the corrosion resistance is poor.

 No.15 has a large amount of Fe and Cu, so its corrosion resistance is poor.

Since No. 16 has a low extrusion temperature, Mg and Si do not form a solid solution sufficiently and the strength is low.

Since No. 17 has a high extrusion temperature, Mg causes burning and cannot be wound.

No. 18 has insufficient quenching, resulting in coarse precipitates and low strength.

Etc. were confirmed.

〔effect〕

As described above, according to the present invention, the electrolysis gripping force is strong, and the tensile strength and the wind noise preventing wound body of the electric wire having excellent corrosion resistance can be continuously and easily manufactured, which is industrially remarkable. It has a great effect.

[Brief description of drawings]

FIG. 1 is a cross-sectional view of a wind noise preventing winding body of an electric wire obtained by the present invention, FIG. 2 is a front view showing an example of its use, and FIG. 3 is a method for testing a winding body gripping force. FIG. 1 ... Winding body, 2 ... Bottom, 3 ... Top, 4 ... Dotted line, 5 ... Fixing device, 6 ... Clamp.

 ─────────────────────────────────────────────────── ─── Continuation of the front page (56) Reference JP-A-59-216415 (JP, A) JP-A-56-84440 (JP, A) JP-A-55-8428 (JP, A) Actual development Sho-57- 200311 (JP, U)

Claims (2)

(57) [Claims] 1. An alloy comprising Mg 0.3-1.4 wt%, Si 0.3-1.4 wt%, Fe or / and Cu 1.0 wt% or less, and the balance Al being a raw material by continuous casting and rolling, and then a rotary foil type. Manufacture of a wind noise prevention winding body for electric wires, which is characterized by continuously extruding a cross-sectional shape into a substantially triangular shape at a temperature of 400 to 570 ° C using a continuous extruder and then rapidly cooling it to 150 ° C or less. Method. 2. An alloy comprising Mg 0.3 to 1.4 wt%, Si 0.3 to 1.4 wt%, Fe or / and Cu 1.0 wt% or less, and the balance Al being a raw material by continuous casting and rolling, and then rotating foil. Using a continuous mold extruder, continuously extruding a cross-sectional shape into a substantially triangular shape at a temperature of 400 to 570 ° C, then immediately cooling to 150 ° C or less, and performing surface reduction processing of 20% or more on this. And a method for manufacturing a wind noise prevention wound body.