JP2700303B2 - Method for manufacturing crimped or compressed terminals - Google Patents

Description

DETAILED DESCRIPTION OF THE INVENTION

[0001]

The present invention relates are those which relate to the production method of crimping or compression terminal used in such tape winding type outdoor termination in power overhead conductors, for example.

[0002]

2. Description of the Related Art As a crimping or compression terminal of this kind, there is conventionally known a structure as disclosed in Japanese Utility Model Laid-Open No. 57-148782. As shown in FIG. 11, a metal tube 101A made of copper or copper alloy cut to a predetermined length is used for the crimping or compression terminal.
FIG. 12 and FIG. 1 show the one end 101a side in the longitudinal direction of FIG.
As shown in FIG. 3, a pressing hole is pressed from the radial direction so that no space is formed inside, thereby forming a plate-shaped portion for connecting the partner terminal, and a connecting hole penetrating through the plate-shaped portion 101a in its thickness direction. On the other hand, the other end 101b side of the metal tube 101A in the longitudinal direction is directly formed into a tubular portion for inserting a conductor, and the inner end of the tubular portion 101b and the plate-like portion 1 are formed.
A brazing portion 103 for sealing is formed on the inner surface of the plate-shaped portion 101a, which is a boundary with 01a.

[0003]

In the conventional crimping or compression terminal 101 having the above-mentioned structure, a metal tube 101A is used, and one end portion 101a in the longitudinal direction is pressed from the radial direction to form a plate-like portion. Therefore, a very small gap remains in a portion closely contacted by the pressing of the one end portion 101a, and a reliable watertight structure cannot be obtained. As a result, when used as it is, external water droplets are generated from the minute gap by the capillarity and the plate-like portion 10
In some cases, the water enters the interior of the tubular portion 101b through the inner surface of the tubular portion 1a, and the penetration of the water droplets easily causes corrosion of the tubular portion 101b and the conductor. In particular, when used in a coastal area, the corrosion progresses remarkably. Also, cracks and the like may occur in the tubular portion due to the freezing and expansion of the water droplets that have entered.
In order to avoid such a situation, in the conventional crimping or compression terminal 101, a brazing portion 103 for sealing is formed on the inner surface of the plate-shaped portion 101a. It has to be performed on a very narrow space, requiring a great deal of work and skill, and has caused an increase in production cost and a decrease in productivity.

SUMMARY OF THE INVENTION The present invention has been made in view of the above-mentioned circumstances, and does not require time and skill such as brazing, and reliably seals a gap between a plate-shaped portion and a tubular portion. It is an object of the present invention to provide a method for manufacturing a crimped or compressed terminal that can reliably prevent corrosion, cracks in a tubular portion, and the like, and can also have excellent conductive characteristics.

[0005]

In order to achieve the above object, a method for manufacturing a crimping or compression terminal according to the present invention is characterized in that a copper solid bar having a predetermined length is provided on one end side in the longitudinal direction. Forming a first hole having a predetermined depth along the axis of the bar from the end face by cold forging; and forming the first hole from the end face on the other end side of the solid bar in the longitudinal direction. Forming, by cold forging, a second hole having a predetermined depth along the axis of and not penetrating the first hole side, and a rear end side on an upper surface thereof;
On the upper surface of the lower mold having an open bar escape recess,
The tubular portion corresponding to the second hole projects on the recess
And then abut the entire length of the peripheral surface of the bar.
Lowering the upper mold having the lower surface to
The rod corresponding to the second hole in the bar
Part into the recess of the lower mold and leave it as a tubular part.
One, press presses the tubular portion corresponding to the first hole from the radially
The method includes a step of crushing and forming a plate-shaped part, a step of forming a connection hole penetrating the plate-shaped part in a thickness direction thereof, and a step of plating the entire bar.

In the above-described manufacturing method, it is preferable that the method further includes a step of annealing the bar before pressing the tubular portion from the radial direction to form a plate-like portion .

[0007]

According to the present invention, first and second holes which do not penetrate each other at a predetermined depth along the axis of the bar from their end surfaces are formed at both ends in the longitudinal direction of the solid copper bar. Then, the entire length of the bar is pressed by the upper and lower dies to
To discharge tubular portion of the end portion in the recess of the lower mold upper surface of the tube-shaped portion
Since only the tubular portion on one end side of the bar is pressed and crushed in the radial direction to leave a plate-like portion while leaving the same, a partition wall portion remains at the far end of the plate-like portion and the tubular portion. Will be. For this reason, even if it is not necessary to perform a work requiring skill and skill, such as providing a brazing portion for sealing on the inner surface of the plate-shaped portion, there is no possibility that water droplets or the like will enter the tubular portion through the plate-shaped portion, and Even in the use state of the above, it is possible to reliably prevent the occurrence of cracks and the like in the tubular portion due to corrosion of the conductor and freezing and expansion of intruding water droplets. In addition, by using a solid copper bar as a material, the conductivity (percent conductivity) can be increased as compared with the case of using a casting material in which impurities such as phosphorus are mixed to remove contained oxygen. It is possible to improve the electrical characteristics by increasing the height.

In particular, when a step of annealing the bar is provided before the tubular portion is pressed from the radial direction to form the plate-like portion,
Since the material is softened by annealing, the pressing process itself becomes easy, and a plate-shaped portion having a predetermined shape can be formed with good finish.

[0009]

Embodiments of the present invention will be described below with reference to the drawings. 1 and 2 are a perspective view and a longitudinal sectional side view, respectively, showing a crimped or compressed terminal obtained by the manufacturing method according to the present invention. In the figure, a crimped or compressed terminal 1 is formed from a solid copper bar 1A. It is composed of a plate-like portion 1d formed at one end portion in the longitudinal direction and a tubular portion 1b 'formed at the other end portion. The partition wall portion 1c for the plate-like portion 1d remains. Reference numeral 2 denotes a connection hole formed through the plate-like portion 1d in the thickness direction.

Next, a method of manufacturing the crimping or compression terminal 1 having the above configuration will be described in the order of steps. First, as shown in FIG. 3, a copper solid bar corresponding to the length dimension of the crimping or compression terminal 1 to be manufactured by cutting a long copper solid bar (not shown) into predetermined length units. A bar 1A is prepared, and a first hole 3 having a predetermined depth along the axis of the bar 1A is provided on one end 1a side of the solid bar 1A in the longitudinal direction as shown in FIG. Is formed by cold forging. In the step of drilling the first hole 3, as shown in FIG.
Bar holding hole 13 in first lower mold 12 arranged above
The solid bar 1A is inserted and held therein, and the other end surface in the longitudinal direction of the solid bar 1A is supported by the tip of a first push-up pin 14 extending from the base 11 side. Then, a punch 17 for making a hole held by the adapter 15 and the holder 16 is inserted into the bar holding hole 13 and the bar 1A is pressed, whereby one end 1a of the bar 1A in the longitudinal direction is pressed. The first hole 3 is formed on the side.

Next, the bar 1A in which the first hole 3 is formed is located on the other end 1b side in the longitudinal direction from the end face thereof as shown in FIG.
As shown in the figure, at a predetermined depth along the axis of the bar 1A,
Further, the second hole 4 is formed by cold forging while not penetrating the first hole 3 side, and leaving the partition wall portion 1c at the inner end thereof. In the step of drilling the second hole 4, FIG.
As shown in FIG. 5, the bar 1A is inserted into the bar holding hole 23 of the second lower mold 22 disposed on the second base 21 and extends from the second base 21 side. Second
The upper end of the push-up pin 24 is fitted into and supported by the first hole 3, and in this state, the punch 27 for making holes held by the adapter 25 and the holder 26 is inserted into the rod holding hole 2.
The second hole 4 is formed on the other end 1b side of the rod 1A in the longitudinal direction by inserting the rod 1 into the rod 3 and pressing the rod 1A.

Immediately after the first and second holes 3 and 4 are formed, the bar 1A is immediately degreased.
Thereafter, the bar 1A is vacuum-annealed to soften, and then the tubular portion 1a corresponding to the first hole 3 in the bar 1A.
The plate-shaped portion 1d as shown in FIG.
To form In the pressing process of the plate-like portion 1d, FIG.
As shown in FIG. 0, a lower mold 32 and an upper mold 33 having a bar material escape recess 31 which is open at the rear end side on the upper surface 32a are prepared.
On the upper surface 32a of the lower mold 32, the other end of the rod 1A is placed in a state where the other end of the tubular portion 1b 'projects above the recess 31 and the second hole 4 of the tubular portion 1b' The length of the plate-shaped portion 1d to be formed is set by inserting a rod-shaped hand-held shape retaining material 34 into the holding member 34 until the positioning member 35 attached thereto comes into contact with the side surface 32b of the lower mold 32. The upper die 33 is lowered, and the entire lower surface 33a of the bar 1A is
By pressing the length, the plate-shaped portion 1d having a predetermined length are squashed one end tubular section 1a' side. At this time, the other end of the bar 1A on the side of the tubular portion 1b 'is escaped to the recess 31 and is left as it is as the tubular portion 1b'.

Since a slightly tapered surface 33b is formed on the lower surface 33a of the upper die 33 corresponding to the other end tubular portion 1b 'of the bar 1A, the tubular portion 1b' is distorted. No deformation.

As described above, the first hole 3 is formed on one end 1a side of the solid bar 1A in the longitudinal direction to form the tubular portion 1a ', and the tubular portion 1a' is pressed to a predetermined shape. Since the plate-like portion 1d is formed, the plate-like portion 1d having a desired shape can be easily formed with a relatively small pressing force.

Thereafter, a plate-like portion 1d of the bar 1A is formed.
, A connecting hole 2 is formed as shown in FIG. Then, after performing the chamfering or deburring of the connection hole 2, flat pressing as finish molding is performed.

Finally, after performing the degreasing treatment on the bar 1A, as shown in FIG. 7, tin plating 5 is applied in the form of a film to complete the manufacture of the predetermined crimping or compression terminal 1. .

When the crimping or compression terminal 1 manufactured in this way is used, the crimping or compression terminal 1 is attached to the plate-like portion 1d as shown in FIG.
As shown in the figure, the mating terminal M is overlapped and fastened and fixed by the screw N and the nut N inserted into the connection hole 2, while the conductor P is in the second hole 4 in the tubular portion 1 b ′. Insert connection.

Here, the crimping or compression terminal 1 is made of a solid bar 1A made of copper, and a partition 1c is left between the plate-like portion 1d and the tubular portion 1b '. Even if it gets into the very small gap formed by the pressing,
Does not penetrate into the holes 4 at all. Therefore,
Complicated, such as providing a brazing portion for sealing between the plate-shaped portion 1d and the tubular portion 1b ', the tubular portion associated with corrosion of the conductor P and freezing and expansion of invading water droplets without providing a step requiring skill. 1b 'can reliably be prevented from being cracked, and good conduction performance can be maintained over a long period of time.

Although the crimping or compression terminal 1 having the above-mentioned partition wall portion 1c can be easily formed by casting, if it is cast, it is contained in a casting material. In order to remove oxygen, impurities such as phosphorus are mixed in, and therefore, the conductivity (percent conductivity) is about 92.8% at the maximum when the standard is 100%. There is a problem in terms of conductivity. On the other hand, as described in the above embodiment, in the case of molding using the solid bar 1A made of copper, when the standard conductivity is set to 100%, the conductivity becomes 100% or more, which is excellent. The conductive properties can be improved.

[0020]

As described above, according to the first aspect of the present invention , the copper solid bars do not penetrate each other at a predetermined depth from their end surfaces along the axis of the bar from both ends in the longitudinal direction. First
And a second hole, respectively, and the entire length of the bar is
Pressing with a mold, of which only the tubular portion on one end side of the bar is pressed from the radial direction and crushed into a plate-shaped portion, so that the plate-shaped portion can be easily formed, and A partition can easily be formed at the end. Therefore, the need for labor and skill, such as providing a brazing portion for sealing on the inner surface of the plate-shaped portion, is unnecessary, and while increasing productivity and reducing production costs, water droplets and the like pass through the plate-shaped portion. It is possible to provide a reliable watertight structure with no possibility of intrusion into the tubular portion, and in particular, it is possible to reliably prevent the tubular portion from cracking due to corrosion of the conductor and freezing and expansion of the intruding water droplets when used outdoors. In addition, by using a solid copper bar as a material, the conductivity (percent conductivity) can be increased as compared with the case of using a casting material in which impurities such as phosphorus are mixed to remove contained oxygen. It is possible to improve the electrical characteristics by increasing the height.

In particular, in the case where a step of annealing the bar is provided before the tubular portion is pressed from the radial direction to form the plate-like portion, the material is softened by the annealing. The processing itself becomes easy, and a plate-shaped portion having a predetermined shape can be formed with a good finish.

[Brief description of the drawings]

FIG. 1 is a perspective view showing one embodiment of a crimped or compressed terminal obtained by a manufacturing method according to the present invention.

FIG. 2 is a vertical side view of a crimping or compression terminal in the embodiment.

FIG. 3 is a partially broken side view of a solid copper bar used for the crimping or compression terminal.

FIG. 4 is a longitudinal sectional side view showing a state in which a first hole is formed on one end side of the bar in the longitudinal direction.

FIG. 5 is a longitudinal sectional side view showing a state in which a second hole is formed on the other end side of the bar in the longitudinal direction.

FIG. 6 is a longitudinal sectional side view showing a state in which a plate-shaped portion is formed by pressing a tubular portion on one end side of the bar.

FIG. 7 is a longitudinal sectional side view showing a partially enlarged state of the bar material plated.

FIG. 8 is a longitudinal sectional front view showing a forming die for forming a first hole in the bar by cold forging.

FIG. 9 is a longitudinal sectional front view showing a forming die for forming a second hole in the bar by cold forging.

FIG. 10 is a vertical sectional side view showing a molding die for pressing a tubular portion on one end side of the bar.

FIG. 11 is a vertical side view of a metal tube used for a conventional crimping or compression terminal.

FIG. 12 is a partially broken plan view of a conventional crimping or compression terminal.

FIG. 13 is a vertical side view of a conventional crimping or compression terminal.

[Explanation of symbols]

1A Copper Solid Bar 1a ', 1b' Tubular Part 1c Partition Part 1d Plate Part 2 Connecting Hole 3 First Hole 4 Second Hole 5 Plating Film

Claims (2)

(57) [Claims] 1. A step of forming a first hole of a predetermined depth from an end surface of a solid copper bar having a predetermined length in a longitudinal direction along an axis of the bar by cold forging. A second hole which has a predetermined depth along the axis of the bar at the other end in the longitudinal direction of the solid bar from the end face thereof, and does not penetrate the first hole side; forming by cold forging, on the
The upper surface of the lower mold having a bar escape recess that is open to the rear end on the surface
The tubular portion corresponding to the second hole is formed by inserting the rod into the recess.
After placing it on the bar,
An upper mold having a lower surface that contacts the entire length
To lower the second hole in the bar.
Or a tubular section for response of the tube-shaped portion in relief in the recess of the lower mold
Forming a plate-shaped portion by pressing and crushing the tubular portion corresponding to the first hole from the radial direction while leaving, and forming a connection hole penetrating the plate-shaped portion in the thickness direction thereof. And a step of plating the entire bar material. 2. The method for manufacturing a crimping or compression terminal according to claim 1, further comprising a step of annealing the bar before pressing the tubular portion from the radial direction to form a plate-like portion.