JPH0831473A - Splice part structure of electric wire, its forming device and its forming method - Google Patents

Abstract

PURPOSE:To easily form a splice part in a short time at a low cost which excels in insulation. CONSTITUTION:A sealing recessed part 16 in which an insulating resin material 18 is located in the periphery of an insulating cover Wa of an electric wire (W) is formed so as to enlarge release recessed parts 14, 15 from the inner surface side forming the cavity 12 of a metal mold 11. Therefore, the insulating resin material inside the cavity 12 which is melted by ultrasonic vibration is made to flow between insulating resin materials inside the sealing recessed part 16, and after that, the insulating resin material is solidified.

Description

Detailed Description of the Invention

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a structure of a splice portion for insulatively covering an electric wire connecting portion of an electric wire such as a wire harness, a forming apparatus thereof and a forming method thereof.

[0002]

2. Description of the Related Art Generally, when connecting an electric wire such as a wire harness, the insulation coating is peeled off to expose the core wires, the core wires are connected by crimp terminals, and then the insulation coating adjacent to the core wire connecting portion and the core wire. The splice part is formed by molding a region (electric wire connection part) including the insulating resin.

Conventionally, the splice portion is formed by injection molding. That is, the wire connecting portion is arranged in the mold cavity, and the molten resin material is injected into the cavity and then solidified.

[0004]

However, if the splice portion is formed by injection molding, it is necessary to cool the mold in order to solidify the resin material injected into the cavity, and it takes time to process. As a result, there is a problem that the cost is increased. Therefore, in view of the above problems, an object of the present invention is to provide a splice portion structure that can be formed easily and inexpensively in a short time, and a forming apparatus therefor.

[0005]

In order to achieve the above object, in the invention according to claim 1, from a region including a core wire whose insulation coating is stripped and connected to each other, and an insulation coating adjacent to the core wire. Around the electric wire connecting portion, a splice portion formed by melting a granular or powdery insulating resin material by ultrasonic vibration and then solidifying it.
A granular or powdery insulating resin material is arranged around the insulating coating adjacent to the electrical connection portion, and the insulating resin material melted at the time of forming the splice portion is caused to flow between the insulating resin materials. And a sealing portion formed by solidifying. Practically, the particle size of the insulating resin material is preferably 1 mm or less.

According to a second aspect of the present invention, a granular material is formed by ultrasonic vibration around an electric wire connecting portion including a core wire in which the insulating coating is peeled off and connected to each other and an insulating coating adjacent to the core wire. Alternatively, a splice portion formed by melting and solidifying the powdery insulating resin material and a ring made of the insulating resin material on the insulating coating adjacent to the core wire are formed on the outer surface of the splicing portion before forming the splicing portion. Then
One end of the ring is formed of a sealing portion formed so as to protrude from the end of the splice portion after the splice portion is formed.

According to the third aspect of the present invention, an electric wire connecting portion including a core wire having an insulating coating stripped off and connected to each other, and an insulating coating adjacent to the core wire is provided in a cavity having an upper opening. A mold which is housed in a state in which the periphery is covered with a granular or powdery insulating resin material, and in which the insulating coating is disposed in a relief concave portion formed from an upper edge portion of a side wall forming the cavity without any gap, An ultrasonic exciter that is inserted from the upper opening of the mold and is tightly fitted in the cavity, is in pressure contact with the insulating resin material, and applies ultrasonic vibration in the vertical direction. A notched step portion that is slightly larger than the escape recess is provided on the cavity inner surface side of the recess to form a sealing recess in which an insulating resin material is accommodated.

According to a fourth aspect of the present invention, the inner surface of the mold forming the cavity is formed so as to become gradually deeper toward the lower side of the connecting portion of the core wire. The inner surface may have various shapes such as a semicircular cross section and an inverted triangular shape.

According to a fifth aspect of the present invention, the periphery of the electric wire connecting portion including a core wire in which the insulating coating is peeled off and connected to each other and the insulating coating adjacent to the core wire, and the electric wire connecting portion are provided. A granular or powdery insulating resin material is arranged around the adjacent insulating coating, and ultrasonic vibration is applied only to the insulating resin material arranged around the electric wire connecting portion to melt it. Then, it is caused to flow between the insulating resin materials arranged around the insulating coating adjacent to the electric connecting portion, and then the molten insulating resin material is solidified to form a splice portion around the electric wire connecting portion. The sealing portion is formed around the insulating coating protruding from the splice portion.

In a sixth aspect of the present invention, a granular or powdery material is formed around an electric wire connecting portion including a core wire in which the insulation coating is stripped and connected differently, and an insulation coating adjacent to the core wire. Before disposing the insulating resin material, the ring made of the insulating resin material is put on the insulating coating adjacent to the core wire, and the insulating resin material is melted by applying ultrasonic vibration, and then solidified. Then, the splice portion is formed around the wire connecting portion so that the ring projects.

[0011]

According to the invention described in claim 1 or 3, if the insulating resin material disposed around the electric wire connecting portion is melted by applying ultrasonic vibration, the melted resin material is adjacent to the electric wire connecting portion. It penetrates between the insulating resin materials arranged around the insulating coating, partially melts them, and then solidifies.

According to the second aspect of the present invention, when the insulating resin material arranged around the electric connection portion is melted by applying ultrasonic vibration, the heat is transmitted to the insulating coating through the ring. .

According to the fourth aspect of the present invention, if the insulating resin material is put into the cavity while the wire connecting portion is arranged in the mold cavity, the insulating resin material is After smoothly flowing into the lower part of the electric wire connecting portion along the inner surface shape, the side surface and the upper part are covered.

[0014]

Embodiments of the present invention will be described below with reference to the accompanying drawings. FIG. 1 is a mold 1 of a device for forming a splice part of an electric wire.
It is a perspective view showing 1. The mold 11 has a cavity 12 that opens upward. The inner surface of the cavity 12 is formed of both end surfaces 12a and a concave curved surface 12b formed between the both end surfaces 12a. Concave curved surface 12
b is formed so as to be gradually deeper toward the lower side of the electric wire connecting portion 5 arranged in the cavity 12, and has a semi-conical shape in which the diameter is gradually reduced toward one end side of the mold 11. is there. However, the shape of the concave curved surface 12b is not limited to a semi-conical shape, and may be various shapes such as a semi-circular shape or an inverted triangle. However, the semi-conical shape provides more uniform insulation performance and the insulation used It is possible to suppress the amount of the resin material 18 (described later) to a necessary minimum.

Further, a first escape recess 14 and a pair of second escape recesses 15 are formed on the end walls 13 from the upper edge, respectively. Both recesses 14 and 15 are continuous with the recesses 14 and 15 on the inner surface side of the cavity. , 15 are formed to have sealing recesses 16 having a width and a depth larger than those of the sealing recesses 16, respectively.

From the upper side of the mold 11, the sealing recess 16 is formed.
As shown in FIG. 4, the ultrasonic wave exciter 17
Is to be inserted. This ultrasonic exciter 17
The tip of the groove has a concave curved surface 17a having substantially the same shape as the concave curved surface 12b of the cavity 12, and is adapted to reciprocate in the vertical direction at a predetermined frequency.

As shown in FIG. 2, in the cavity 12, as in the conventional case, the insulation coating Wa is peeled off and connected to each other by the crimp terminal 7, and the insulation coating Wa adjacent to the core wire Wb. The electric wire connecting portion 5, which is an area including and, is accommodated.

Further, an insulating resin-shaped groove 18 is accommodated in the cavity 12. The insulating resin material 8 is in the form of particles or powder, for example,
In addition to PVC (polyvinyl chloride), PP (polypropylene), PE (polyethylene), PBT (polybutylene terephthalate), various nylons and other resin materials having a melting point almost the same as or lower than that of the insulating coating Wa, polyetherimide, Teflon, etc. A resin material having a high melting point can be used.

In the splice portion forming device, the splice portion 19 is formed around the wire connecting portion 5 as follows. That is, first, the mold 11 is moved to dispose the wire connecting portion 5 in the cavity 12 as shown in FIG. In this case, the insulating coating Wa is slightly projected into the cavity 3 and is disposed in the first escape recess 6 and the second escape recess 7 without any gap.

Then, as shown in FIG. 3, an insulating resin material 18 is put into the cavity 12 from above. Since the insulating resin material 18 to be charged is granular or the like and the concave curved surface 12b is formed on the inner surface of the cavity 12, the insulating resin material 18 smoothly flows into the lower portion of the electric wire connecting portion 5, and then covers the side and the upper portion ( (See FIG. 4). Therefore, cavity 1
It is not necessary to put the insulating resin material 18 in advance before disposing the wire connecting portion 5 in the wire 2, so that the working efficiency is good.
The insulating resin material 18 also flows into the sealing recess 16 and covers the periphery of the insulating coating Wa.

Then, the tip of the ultrasonic exciter 17 is inserted from the upper opening of the die 11 (see FIG. 5). Since the tip of this ultrasonic exciter 17 has a concave curved surface 17a,
The insulating resin material 18 put into the cavity 12 has a truncated cone shape around the electric wire connecting portion 19. Then, the ultrasonic exciter 17 is vibrated up and down to insulate the insulating resin material 1
Ultrasonic waves are applied to 8 to melt it. In this case, first
Insulating resin material 18 located directly below the ultrasonic exciter 17
(Indicated by a region A in FIG. 6) is melted. The melted insulating resin material 18 flows into the sealing recess 16, penetrates between the insulating resin materials 18 in the sealing recess 16, and partially melts them.

After that, if the insulating resin material 18 is solidified by stopping the vibration of the ultrasonic exciter 17, the mold 1
Take out from 1. As a result, the splice portion 19 is formed around the wire connecting portion 5, and the splice portion 1 is also formed.
A sealing portion 19a is formed around the insulating coating Wa protruding from 9.

Thus, according to the mold structure, the insulating resin material 1 melted by the ultrasonic vibrator 17 is formed by forming the sealing recesses 16 in the both end walls 13 of the mold 11.
Since 8 penetrates into the insulating resin material 18 in the sealing recess 16 and solidifies, the insulating coating Wa in the portion contacting the recesses 14 and 15 is directly heated and melted as in the conventional case. Therefore, there is no possibility that the wall thickness is partially reduced and the insulation is not deteriorated. Further, the mold 11 of the present application has an advantage that it can be dealt with by slightly changing the conventional mold 1.

FIG. 8 shows that a ring 20 is used to prevent the insulation coating Wa from being melted when the splice portion 19 is formed. That is, the ring 20 is in the shape of a half cylinder having a substantially C-shaped cross section, and an insulating resin, for example, a resin material having a high melting point (polyetherimide, Teflon, etc.) can be used. The ring 20 is covered with the insulating coating Wa at a portion adjacent to the core wire Wb of the electric wire connecting portion 5 by widening opposite side edges.

A splice portion 1 is provided around the electric wire connecting portion 5.
The mold 21 for forming 9 has the concave curved surface 22a of the inner surface forming the cavity 22, similar to the mold 11 according to the above-mentioned embodiment, but the sealing concave portion 16 is not necessary, and The escape recesses 23 are escape recesses 1 and 1 of the mold 11.
As compared with 5, the ring 21 is expanded by the thickness of the ring 21.

The formation of the splice 19 by the mold 21 is performed by the mold 21 and the ultrasonic exciter 1 as in the case of the above embodiment.
In step 7, the insulating resin material 18 such as particles is solidified around the electric wire connecting portion 5. In this case, the insulating resin material 18 in the cavity 22 is melted by ultrasonic vibration, but since the insulating coating Wa of the electric wire W is covered by the ring 20 in the escape recess 23, heat is directly transmitted from the mold 11. In this case, melting does not occur and desired insulation performance can be maintained.

[0027]

As is apparent from the above description, in the invention described in claim 1, 3 or 5, the splice portion is formed by melting the granular or powdery insulating resin material by ultrasonic vibration, Since the molten resin is made to flow between the insulating resin materials arranged around the insulating coating adjacent to the splice portion and solidified to form the sealing portion, the insulating coating does not melt. It is possible to prevent deterioration of insulation performance. Further, even a high melting point material can be used.

According to the second or sixth aspect of the present invention, the ring is mounted on the insulating coating so as to communicate with the inside and outside of the mold through the relief recess formed in the side wall of the mold, so that the inside of the cavity is ultrasonically vibrated. Even if the insulating resin material of is melted and the mold is heated, the heat is transmitted to the insulating coating through the ring, and the insulating coating is melted and the wall thickness is reduced. There is no problem.

In the invention according to claim 4, since the inner surface of the mold cavity is formed so as to become gradually deeper toward the lower side of the electric wire connecting portion, after the electric wire connecting portion is disposed in the cavity, the insulating property is improved. Even if the resin material is charged, the insulating resin material smoothly covers the electric wire connecting portion from the lower side to the lateral side and the upper side. Therefore, it is not necessary to separately perform the work of introducing the insulating resin material before and after the arrangement of the electric wire connecting portion, and the work efficiency can be improved and the work cost can be reduced.

[Brief description of drawings]

FIG. 1 is a perspective view of a mold of a splice portion forming device according to this embodiment.

FIG. 2 is a perspective view showing a state in which electric wires are arranged in a cavity of the mold shown in FIG.

FIG. 3 is a perspective view showing a state in which an insulating resin material is put into the cavity of the mold from the state shown in FIG.

FIG. 4 is a perspective view showing a state in which an insulating resin material has been charged into the cavity of the mold as shown in FIG.

5 is a perspective view showing a state where an ultrasonic exciter is inserted from the upper opening of the mold shown in FIG.

6 is a cross-sectional view of FIG.

FIG. 7 is a perspective view of a splice portion formed by the splice portion forming device shown in FIG.

FIG. 8 is a perspective view of a mold and an electric wire of a splice part forming device according to another embodiment.

9 is a cross-sectional view of FIG.

10 is a perspective view of a splice portion formed by the splice forming device shown in FIG.

[Explanation of symbols]

 Reference Signs List 11 Mold 12 Cavity 14 First escape recess 15 Second escape recess 16 Sealing recess 18 Insulating resin material W Electric wire Wa Insulation coating

Claims (6)

[Claims] 1. A granular or powdery insulating property due to ultrasonic vibration around an electric wire connecting portion formed of a region including a core wire having an insulating coating stripped and connected to each other and an insulating coating adjacent to the core wire. A splice portion formed by melting and then solidifying a resin material, and a granular or powdery insulating resin material disposed around the insulating coating adjacent to the electrical connection portion, and the insulating resin material. A splice part structure for an electric wire, comprising: a sealing part formed by inflowing and solidifying an insulative resin material melted during the formation of the splice part. 2. A granular or powdery insulating property due to ultrasonic vibration around an electric wire connecting portion formed of a region including a core wire having an insulating coating stripped and connected to each other and an insulating coating adjacent to the core wire. A splice portion formed by melting and solidifying a resin material, and a ring made of an insulating resin material is attached to an insulating coating adjacent to the core wire before forming the splice portion, and one end of the ring is formed. A sealing portion formed after the formation of the splice portion so as to project from an end portion of the splice portion,
The splice part structure of the electric wire, which is characterized in that 3. An electric wire connecting portion composed of a region including a core wire having an insulation coating stripped off and connected to each other and an insulation coating adjacent to the core wire is provided in a cavity having an upper opening, and the periphery thereof is granular or powdery. And a mold in which the insulating coating is housed in a state of being covered with an insulating resin material, and the insulating coating is provided in a relief recess formed from an upper edge of a side wall forming a cavity without any gap, and an upper opening of the mold. And an ultrasonic exciter that presses against the insulating resin material and applies ultrasonic vibration in the vertical direction, and is inserted into the cavity, and the mold is provided with a cavity inner surface side of the escape recess. An apparatus for forming a splice part of an electric wire, characterized in that a notched step part which is slightly larger than the escape recess part is provided to form a sealing recess part for accommodating an insulating resin material. 4. An apparatus for forming a splice portion of an electric wire according to claim 3, wherein an inner surface of the mold forming the cavity is formed so as to be gradually deeper toward a lower portion of the connecting portion of the core wire. 5. A periphery of an electric wire connecting portion including a core wire having an insulating coating stripped off and connected to each other and an insulating coating adjacent to the core wire, and a periphery of an insulating coating adjacent to the electric wire connecting portion. A granular or powdery insulating resin material is provided in the and, and ultrasonic vibration is applied only to the insulating resin material provided around the electric wire connecting portion, thereby melting the insulating resin material and melting the electric connecting portion. The insulating resin material disposed around the insulating coating adjacent to the wire, and then the molten insulating resin material is solidified to form a splice portion around the wire connecting portion, and the splicing portion is formed. A method for forming a splice part of an electric wire, comprising forming a sealing part around an insulating coating projecting from the part. 6. A granular or powdery insulating resin material is provided around an electric wire connecting portion including a core wire in which the insulation coating is stripped and connected differently, and an insulation coating adjacent to the core wire. Before arranging, a ring made of an insulating resin material is packaged on the insulating coating adjacent to the core wire, and the insulating resin material is melted by applying ultrasonic vibration, and then solidified to solidify the wire connection portion. A method for forming a splice part of an electric wire, characterized in that a splice part is formed around the ring so that the ring projects.