JPH07302673A - Compression die - Google Patents

Abstract

PURPOSE:To maintain a high service life, and achieve a light weight by forming an inner circumferential part to get in contact with a tubular member of iron-based material, and an outer circumferential part surrounding the inner circumferential part of aluminum-based material. CONSTITUTION:A compression die 11 is formed of an inner circumferential part 12 to get in contact with a sleeve 5, and an outer circumferential part 13 to surround the inner circumferential part 12. The inner circumferential part 12 is formed of iron- based material of high strength having toughness in a thin semicylindrical form having a semicircular cross sectional surface and having a groove 14 of an inner surface having a trapezoid-shaped cross sectional surface. The outer circumferential part 13 is formed of aluminum-based material of light weight having an outer surface of a rectangular cross sectional surface and an inner surface of a semicircular cross sectional surface with which the outer surface of the inner circumferential part 12 gets in contact. Two overhead conductors 6 are inserted from both ends of the sleeve 5 to be put to each other, and a specified position of the sleeve 5 is compressed and caulked by the compression die 11. Because the iron-based material and the aluminum- based material are used for the inner circumferential part 12 and the outer circumferential part 13 respectively, a high service life is maintained, and light weight is achieved.

Description

Detailed Description of the Invention

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a lightweight and long-life compression die for use in compression-connecting a stranded wire such as an overhead wire using a tubular member such as a sleeve.

[0002]

2. Description of the Related Art To connect a stranded wire such as an overhead wire, as shown in FIG. 2A, two overhead wires 6 are inserted from both ends of a sleeve 5 and abutted to each other, and a predetermined position of the sleeve 5 is fitted from outside. It is compressed by the compression die 41 and caulked. Further, as shown in FIG. 2B, when the overhead wire 6 is to be held on a steel tower (not shown), the overhead wire 6 is inserted into the pulling clamp 7 and the predetermined position of the pulling clamp 7 is compressed from outside by a compression die 41. Compress and crimp.

FIG. 3 is a cross-sectional view of a compression die. The compression die 41 has a block shape with a groove 44 having a trapezoidal cross section formed on the inner surface. Two compression dies 41 are arranged so that grooves 44 face each other, the sleeve 5 is arranged between the grooves 44 facing each other, and the sleeve 5 is compressed between the compression dies 41 and caulked. Sleeve 5 of the overhead wire of the book
Connect through. And to compress the sleeve 5,
A pressure of 100 tons or more was required, and therefore, the compression die 41 was made of a high-strength ferrous material.

[0004]

Since the compression die using the iron-based material is heavy, a heavy burden is imposed on the operator when connecting the overhead wire to the steel tower. Therefore, a comparatively lightweight and high-strength titanium compression die was prototyped, but it was not put to practical use because the weight reduction was insufficient and it was expensive. As the material for the compression die, a high strength Al alloy or an Al composite material in which ceramic fibers are dispersed is used.
Since these Al-based materials have poor toughness, the side in contact with the sleeve suffers fatigue fracture within a short period of time, which is economically disadvantageous.

[0005]

DISCLOSURE OF THE INVENTION The present invention has been earnestly studied in such a situation, and an object thereof is to provide a compression die which is lightweight and has a long life. . That is, the present invention is a compression die used for connecting the twisted wire to the tubular member by compressing a predetermined position of the tubular member into which the end of the twisted wire is inserted from the outside, in which the compression die is a tubular member. And an outer peripheral portion surrounding the inner peripheral portion, wherein the inner peripheral portion is formed of an iron-based material and the outer peripheral portion is formed of an aluminum-based material. .

The compression die of the present invention is divided into an inner peripheral portion which is in contact with a tubular member such as a sleeve and which is easily fatigue-fractured, and an outer peripheral portion which surrounds the inner peripheral portion, and the inner peripheral portion has a toughness. A high-strength iron-based material is used to maintain a long life, and an Al-based material is used for the outer peripheral portion to reduce the weight. High-strength alloy steel is mainly used as the iron-based material forming the inner peripheral portion. Particularly, tough steel such as nickel / chromium / molybdenum steel, chromium / molybdenum steel, vanadium steel is suitable. The outer peripheral part should be strong enough to withstand the transmission of pressure,
An Al-based material can be used for strength. As the Al-based material, an Al alloy such as JIS-2000 or JIS-7000 is used. Also, an Al composite material in which ceramic fibers or ceramic particles such as alumina, carbon, silicon carbide, boron, or alumina silica are mixed with Al or Al alloy can be applied. In the compression die of the present invention, the inner peripheral part in contact with the sleeve is made as thin as possible within the range in which the strength is guaranteed, and the outer peripheral part is thickened, whereby the weight can be further reduced. If the inner peripheral portion and the outer peripheral portion are joined by fitting so that the inner peripheral portion, which is easily damaged by fatigue, can be easily replaced, the workability is improved and the cost can be reduced.

In the present invention, the tubular member is, for example, 2
A sleeve for connecting the overhead wire (stranded wire) of the book, or a strain clamp or a compression type clamp for connecting the overhead wire to a steel tower or the like. The compression die of the present invention can also be applied to a case where a twisted wire such as a steel wire other than an overhead wire is compression connected using a tubular member.

[0008]

The compression die of the present invention is composed of an inner peripheral portion in contact with the tubular member and an outer peripheral portion surrounding the inner peripheral portion, and the inner peripheral portion is made of a tough and high strength iron-based material, Since the aluminum-based material is used for the outer peripheral portion, it has a long life and is lightweight. Further, the material cost can be reduced as compared with the one-piece compression die using expensive tough steel.

[0009]

EXAMPLES The present invention will be specifically described below with reference to examples. (Embodiment 1) FIG. 1A is a transverse sectional view showing a first embodiment of a compression die of the present invention. The compression die 11 includes an inner peripheral portion 12 that contacts the sleeve 5 and an outer peripheral portion that surrounds the inner peripheral portion 12.
It is composed of 13 and. The outer surface of the inner peripheral portion 12 is a semi-cylindrical semi-cylindrical cross section, and a groove 14 having a trapezoidal cross section is formed on the inner surface. An outer surface of the outer peripheral portion 13 has a quadrangular cross section, and an inner surface of the outer peripheral portion 13 has a semicircular cross section. The outer surface of the inner peripheral portion 12 is in surface contact with the inner surface. The inner peripheral portion 12 was made of nickel / chromium / molybdenum steel. The outer peripheral portion 13
A T6 treated material of JIS-7075 alloy (Al-Zn-Mg type) was used for.
The inner peripheral portion 12 and the outer peripheral portion 13 were joined by thermocompression bonding.

(Embodiment 2) FIG. 1B is a cross sectional view showing a second embodiment of the compression die of the present invention. This compression die 21 is the same as the compression die shown in the first embodiment except that the outer surface of the inner peripheral portion 22 and the inner surface of the outer peripheral portion 23 are formed in a quadrangular cross section. The corner portion of the quadrangle was strengthened by increasing R.

(Embodiment 3) FIG. 1C is a cross-sectional view showing a third embodiment of the compression die of the present invention. This compression die 31 is the same as the compression die shown in the first embodiment, except that the outer surface of the inner peripheral portion 32 and the inner surface of the outer peripheral portion 33 are formed in an inverted trapezoidal cross section. The inner peripheral portion 32 and the outer peripheral portion 33 are joined by fitting and are detachable. Therefore, the inner peripheral portion 32, which is easily worn, can be easily replaced. It is easy to handle if both are shrink fitted, and it is safe even when working in high places.

A life test was conducted on the obtained three types of compression dies. For comparison, JIS-7075 alloy (Al-Zn-Mg series) T6 treated material, SiC fiber reinforced Al composite material, or compression steel die made of high-strength steel (nickel / chromium / molybdenum steel) is also subjected to the same test. It was As shown in FIG. 4, this test was performed by disposing a test rod 8 having a hexagonal cross section between compression dies 11 and repeatedly compressing it with a compression die 11.
This test rod 8 was made of high-strength PC steel (SBPR110 / 135) so as not to be deformed by repeated compression. In addition, the aspect ratio of the cross section is increased so that the upper and lower compression dies 11 do not come into contact with each other during compression. The life is represented by the number of compressions until a crack is formed on the surface of the compression die that contacts the test rod 8. The results are shown in Table 1. The weight ratio is also shown when the weight of the tough steel compression die is 100.

[0013]

[Table 1] * Nickel, chrome, molybdenum steel. # Base metal
JIS-7075-T6 treated material.

As is clear from Table 1, the products of the present invention (N
o.1 to 3) all have a long life and are made of tough steel compression dies (No.6)
It is equivalent to, and the weight was halved. The comparative examples Nos. 4 and 5 all had a very short life due to insufficient toughness. By using the example product of the present invention, the compression connection work on the steel tower was facilitated without burdening the operator.

The compression die using nickel-chromium-molybdenum steel as the iron-based material and JIS-7075-T6 treated material as the aluminum-based material has been described above. The same effect can be obtained when a system material is used or when another aluminum-based material such as a fiber-reinforced Al composite material is used in the outer peripheral portion.

[0016]

[Effect] As described above, the compression die of the present invention uses the iron-based material only in the inner peripheral portion and the aluminum-based material in the outer peripheral portion, which requires high strength. It can be made lighter and has a significant industrial effect.

[Brief description of drawings]

FIG. 1 is a cross-sectional view showing an embodiment of a compression die of the present invention.

FIG. 2 is an explanatory side view showing a state of compression connection using a compression die.

FIG. 3 is a cross-sectional view of a conventional compression die.

FIG. 4 is an explanatory diagram of a life test of a compression die.

[Explanation of symbols]

 11,21,31,41 ── Compression die 12,22,32 ──── Inner circumference 13,23,33 ────Outer circumference 14,24,34,44 ── Groove 5 ───── ─ Sleeve 6 ────── Overhead electric wire 7 ────── Straining clamp 8 ─────── Test rod

Claims (1)

[Claims] 1. A compression die for use in connecting a stranded wire to a tubular member by externally compressing a predetermined position of the tubular member into which the end of the stranded wire is inserted, wherein the compression die contacts the tubular member. A compression die comprising an inner peripheral portion and an outer peripheral portion surrounding the inner peripheral portion, wherein the inner peripheral portion is formed of an iron-based material and the outer peripheral portion is formed of an aluminum-based material.