JP2001162646A - Apparatus for waterproof treatment of terminal connection part of coated electric wire - Google Patents

Abstract

PROBLEM TO BE SOLVED: To reduce the number of work processes accompanied by the removal of a runner by preventing the generation of the runner after mold release by the runner communicating with an injection gate of a molten resin in an apparatus for applying waterproof treatment to a terminal connection part, which is formed by bonding a terminal metal fitting to the conductor of the leading end part of a coated electric wire under pressure, by coating the connection pant with a molding resin in a mold. SOLUTION: An apparatus principal part comprises a mold 50 which has a molding part 51 having a cavity wherein a terminal connection part formed by bonding a terminal metal fitting 20 to the conductor 11 of the leading end part of a coated electric wire 10 under pressure is housed to be set and a molding resin 30 is injected in the molding part 51 in a molten state from the runner 52 of an injection gate to coat and mold the terminal connection part by the molding resin. An injection nozzle 55 operating the runner 52 so as to allow the same to advance and retreat is provided and the nozzle tip part 55a of the injection nozzle 55 is allowed to penetrate into the molding part 51 to immediately inject the molding resin 30 in the molding part and the terminal connection part is obtained as a runnerless resin coated part after demolding.

Description

DETAILED DESCRIPTION OF THE INVENTION

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to an apparatus for waterproofing a terminal portion of a covered electric wire which has been waterproofed by resin molding.

[0002]

2. Description of the Related Art In general, in the case of a covered electric wire, its end is peeled off to expose a conductor, and it is connected to an electric component or device through a terminal fitting which is crimped to the bare conductor and crimped. If the bare wire conductor after crimping is left as it is, moisture is transmitted and penetrates, and there is a disadvantage that it penetrates into the coated electric wire by capillary action. In order to prevent this, the terminal connection portion including the bare wire conductor is protected by various covering means and waterproofed.

[0003] For example, a ground terminal fitting described in Japanese Patent Application Laid-Open No. 10-289745 is waterproofed by covering a bare wire conductor at a terminal connecting portion with a heat-shrinkable tube and heat-welding it. Further, as in a connection plate for a battery holder described in Japanese Patent Application Laid-Open No. H11-120986, in a wiring to a power supply battery of an electric vehicle, a terminal connection portion in which a terminal fitting is crimped to a bare conductor is covered with a mold resin. A technique for performing waterproofing is also well known.

FIGS. 5 and 6 are side sectional views showing a molding die constituting a main part of the resin mold waterproofing device for conceptually explaining the latter resin mold waterproofing device.

[0005] In preparation for molding, the covered electric wire 1 as a molded work is peeled at its tip to expose the conductor 2, and the bare metal conductor 2 is crimped by crimping a terminal fitting 3 or the like. A terminal connection is formed. The terminal fitting 3 of the illustrated example has a flat connecting portion 3a at the tip, and the caulking portions 3b and 3c at the rear portion are caulked and crimped to the bare conductor 2. The terminal connecting portion thus formed is connected to the vehicle body as a ground wire with the tip connecting portion 3a of the terminal fitting 3 by, for example, a bolt.

As shown in FIG. 5, the terminal connecting portion is positioned at a predetermined position in the center of the molding die 4 and starts molding. The molding die 4 has a molding part 5 which is a molding cavity for covering and molding almost the entire terminal connecting part except for the tip connecting part 3a of the terminal fitting 3 with a molding resin. Of the injection gate to inject water
And so on.

Therefore, as shown in FIG. 6, when the terminal connecting portion of the molding work is set, the injection nozzle 7 injects the molten molding resin 8 into the molding portion 5 from the runner 6 of the injection gate. . When the mold resin 8 covering the terminal connection portion is cooled and hardened, it is released from the molding die 4.

[0008]

However, the molding die 4 which is a main part of the conventional resin mold waterproofing apparatus shown in FIGS. 5 and 6 has the following problems.

As shown in FIG. 6, after the terminal connecting portion is covered with the mold resin 8 and molded and released, the resin runner 6a by the runner 6 adheres in a protruding state to the resin coated portion and is released. This resin runner 8a is cut and removed with the labor of the operator in the next process, and this has led to automation and an increase in the number of man-hours as unnecessary work.

Accordingly, an object of the present invention is to provide a terminal connecting portion formed by crimping a terminal fitting to a conductor at the tip end of a covered electric wire with a metal mold to perform resin coating and waterproof treatment. It is an object of the present invention to provide a waterproofing device for a terminal portion of a covered electric wire terminal which is effective in reducing the number of work steps involved in removing a runner by preventing a runner from being formed after the mold is released by a running runner.

[0011]

In order to achieve the above object, a waterproofing device for a terminal portion of a covered electric wire according to the present invention is characterized in that a terminal fitting is crimped to a conductor at the tip of a covered electric wire. It has a mold part of a molding cavity for accommodating and setting the formed terminal connection part, and by injecting and injecting a mold resin in a molten state from a runner of an injection gate into the mold part, the mold resin is used. A device comprising a molding die for covering and molding a terminal connection portion as a main portion of the device, comprising an injection nozzle for operating the runner to move forward and backward, and the tip of the nozzle of the injection nozzle is directly inserted into the mold portion. It is characterized in that a mold resin is injected, and the terminal connection portion after the mold release is a runnerless resin coating portion.

With the above arrangement, the tip end of the injection nozzle is made to enter the mold portion of the molding die, and the molten mold resin is directly injected into the mold portion. It is also effective for automation of post-processes, such as molding as a resin coating that does not generate runners due to runners, reducing the number of work steps for removing runners, and shortening molding time as a runnerless method. .

[0013]

BRIEF DESCRIPTION OF THE DRAWINGS FIG. 1 is a perspective view showing an embodiment of a waterproofing device for a terminal of a coated electric wire according to the present invention.

FIG. 1 is a perspective view showing a terminal connecting portion before waterproof treatment in which a terminal fitting 20 is crimped on a bare conductor 11 exposed by peeling off the end of a covered electric wire 10. The terminal fitting 20 has an opening 22 at the center of the flat connecting portion 21 at the tip, and as shown in FIG.
For example, a bolt 41 is inserted and connected to an automobile body 42 or the like to be used as a ground wire. In addition, caulking portions 23 and 24 are provided on the rear portion of the connecting portion 21 to be caulked and crimped to the bare wire conductor 11.

FIGS. 2 and 3 are cross-sectional views showing a state before and after injection in a molding die 50 of a main part of the apparatus for setting and waterproofing the terminal connection portion.

The molding die 50 is a mold part 51 of a molding cavity.
And a runner 52 of an injection gate for injecting a molten mold resin into the mold portion 51. One side of the mold portion 51 faces the outside of the mold, and one side is closed by an elastic closing plate 53 made of rubber material or the like, and the elastic closing plate 53 is held by a clamp 54. As shown in FIG. 3, in the runner 52, the injection nozzle 55 can be operated so as to be able to move in and out, and is mechanically set so that the nozzle tip 55 a can enter the mold part 51.

Therefore, when waterproofing the terminal connection part, as shown in FIG. 2, the terminal connection part is housed in the molding part 51 of the molding die 50 as a molding work except for the connection part 21 at the tip of the terminal fitting 20. Is set. The covered electric wire 10 extending to the rear of the terminal fitting 20 does not need to be waterproofed by welding a resin mold, so that it is taken out of the mold. The projecting portion of the covered electric wire 10 coming out of the mold portion 51 is elastically held by an elastic closing plate 53.

Next, after the work is set, as shown in FIG. 3, the injection nozzle 55 is operated to enter the runner 52, and the operation is stopped at a position where the nozzle tip 55a enters the mold portion 51. The mold resin 30 in a molten state is injected from such a nozzle tip 55 a and injected into the mold 51. The mold resin 30 spreads all over the inside of the mold portion 51 and covers and welds the terminal connection portion.

During the injection of the mold resin 30, the pressure holding time and the cooling time of the mold resin 30 are set, and the injection nozzle 55 retreats from the runner 52 when the injection of a predetermined amount is completed. When the mold is released after cooling and curing the resin by the injection of the mold resin into the mold portion 51, the runner 8a of the conventional structure shown in FIG. 6 does not occur, and the terminal connection portion is covered with the mold resin 30 as shown in FIG. And waterproof.

As described above, since the runner runner is not generated, the unnecessary work of removing the runner after the mold release is eliminated. Also, that there is no runner runner,
Since there is no need to allow for the resin cooling time of the runner portion, there is an advantage that the injection molding temperature of the mold resin 30 can be set lower and the molding time can be reduced.

[0021]

As described above, according to the present invention, the waterproofing device for a coated wire terminal connecting portion according to the first aspect of the present invention comprises:
The tip end of the injection nozzle enters the mold part of the molding die, and the molten mold resin is injected directly into the mold part. Can be molded as a resin coating that does not occur,
It is effective for automation of the post-process, for example, the work man-hour for removing the runner can be reduced and the molding time can be shortened as a runnerless method.

[Brief description of the drawings]

FIG. 1 is an external perspective view showing a state before waterproofing treatment with a mold resin as an embodiment of a terminal connection portion of a covered electric wire according to the present invention.

FIG. 2 is a cross-sectional view showing a state where a terminal connection portion is set as a molding work in a molding portion of a molding die which is a main portion of the apparatus of the present embodiment.

FIG. 3 is a cross-sectional view showing a state in which an injection nozzle enters a mold section after work setting and a molten resin is directly injected and injected;

FIG. 4 is a partial cross-sectional side view showing one embodiment in which a terminal connection portion after waterproofing, which is formed as a runnerless resin coating portion after mold release by the molding die of the present embodiment, is attached to an automobile body as a ground wire. is there.

FIG. 5 is a sectional view showing a conventional molding die before injection.

FIG. 6 is a sectional view showing a state in which a runner is generated during injection in the molding die of the conventional example.

[Explanation of symbols]

 DESCRIPTION OF SYMBOLS 10 Insulated electric wire 11 Bare wire conductor 20 Terminal fitting 21 Connecting part 23, 24 Caulking part 30 Mold resin 50 Molding die 51 Mold part 52 Runner of injection gate 53 Elastic closing plate 54 Clamp 55 Injection nozzle 55a Nozzle tip

Continued on front page F-term (reference) 4F202 AD03 AD05 AD15 AG03 AG14 AH34 AM32 CA11 CB01 CB12 CB17 CK02 CQ07 4F206 AD03 AD05 AD15 AG03 AG14 AH32 AH34 JB12 JB17 JB20 JF05 JQ51 5E063 JB03 JB08 XA10

Claims (1)

[Claims] 1. A mold having a molding cavity for accommodating and setting a terminal connecting portion formed by crimping a terminal fitting to a conductor at the tip end of a covered electric wire, wherein the molding portion is melted from a runner of an injection gate. Injecting and injecting the mold resin in a state, a waterproofing treatment device including a molding die for covering and forming the terminal connection portion with the mold resin as a main component of the waterproof treatment device, which moves forward and backward through the runner. A coated electric wire, comprising: an injection nozzle; a tip end portion of the injection nozzle being inserted into the mold portion, a mold resin is directly injected, and the terminal connection portion after release is a runnerless resin coating portion. Waterproofing device for terminal connection.