JPH09223428A - Insert molding part and manufacture therefor - Google Patents

Abstract

PROBLEM TO BE SOLVED: To prevent a foreign matter and a waterdrop or the like from infiltrating from a cutting hole when an electric conductor is separated into plural parts by cutting a connecting part after the electric conductor in the shape of being connected by the connecting part is formed in insulators by insert molding, by a simple structure of an insert molding part and a simple manufacturing method of the insert molding part without using a separate part and a sealant or the like. SOLUTION: An electric conductor in the shape of being connected by a connecting part is formed in insulators 2 by insert molding. Afterwards, the connecting part is cut together with the insulators 2. An insulator part of an insulator piece 21 generated in that case is detained in a cutting hole 22, and the connecting part being the electric conductor is slipped off. Therefore, the insulator piece 21 prevents infiltration of a foreign matter or the like.

Description

Detailed Description of the Invention

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to an improved technique for insert-molded parts such as a pole board of a switch and a method for manufacturing the same, and in particular, after insert-molding a conductor having a shape connected by a connecting portion into an insulator. This is a technique for preventing foreign matter, water droplets, and the like from entering through the cutting hole formed for cutting the connecting portion when the connecting portion is cut and the conductor is separated into a plurality of pieces.

[0002]

2. Description of the Related Art A conventional technique of this type is disclosed in, for example,
There was a technique shown in Japanese Patent No. 76216. This prior art shows a technique for forming a switch pole board by using an insert molding technique. As shown in FIGS. 7 and 8, the shape before insert molding has a shape connected by a connecting portion a. After the conductors b and e were insert-molded into the insulators c and f, the connecting portion a was cut to separate the conductors b and e into a plurality of pieces. There are cutting holes d and g formed at the time of molding the insulators c and f at the position where the connecting portion a is located, and the connecting portion a is cut through the cutting holes d and g. Incidentally, the cutting is performed by, for example, a punch (not shown) provided in a molding die.

[0003]

However, the above-described insert-molded component of the prior art has a problem that foreign matter, water droplets or the like enter the inside through the cutting holes d and g to cause insulation failure of the switch. For this reason, it is necessary to prevent the entry of foreign matter, water droplets, etc. by closing the cutting holes d, g with a separate component or a sealing agent.

The present invention has been made to solve the above-mentioned problems and has a simple structure and a simple insert-molded part without the use of a separate part, a sealant or the like to prevent foreign matter, water droplets, etc. from entering through the cutting hole. The present invention aims to prevent this by a method for manufacturing an insert-molded component and to drop only the cut connecting portion from the cutting hole, thereby further improving the insulating performance between the separated conductors.

[0005]

In order to solve the above-mentioned problems, first, the invention according to claim 1 is to provide a conductor having a shape in which a shape before insert molding is connected by a connecting portion, and the conductor. An insert-molded insulator, an insulator piece that occurs when the connecting portion is cut together with the insulator, and a cut hole that allows the connecting portion to fall off but does not drop off the insulating portion of the insulator piece. Provide insert molded parts.

According to a second aspect of the present invention, the insulator constitutes at least one wall surface of a storage space for storing an electric component, and the insulator piece from which the connecting portion has fallen is retained in a cutting hole for storage. (EN) Provided is an insert-molded part that blocks the inside and the outside of a space.

Further, the invention according to claim 3 provides an insert-molded component in which the insulator piece from which the connecting portion is dropped protrudes from the cutting hole to the outside between the storage chambers.

Further, according to the invention of claim 4, a switch pole board is constituted by an insulator having a cut hole in which an insulator piece from which the connecting portion has fallen is retained, and an electric conductor insert-molded in the insulator. Provided insert molded parts.

According to a fifth aspect of the present invention, a first conductor is insert-molded into an insulator, the conductor having a shape connected by a connecting portion.
A second step of cutting the connecting portion together with the insulator with a cutting machine following the first step, and the second step following the second step
An insert-molded component having a third step of separating the cutting machine and the insulator while leaving the connecting portion of the insulator piece generated in the step and leaving only the insulator part in the cutting hole without dropping the insulator part. A method for manufacturing the same is provided.

[0010]

1 is a block diagram of a first embodiment of the present invention.
This will be described with reference to FIG. In the first embodiment, the lower portion of the connecting portion 11 is hollow by hollowing out the insulator 2 so that only the cut connecting portion 11 is detached. Reference numeral 1 in the drawing is a conductor. The conductor 1 is formed by pressing a member such as a metal plate,
In the pre-process of insert molding into the insulator 2 which will be described later, as referred to by the conventional technique shown in FIG.
The shape is connected by. The conductor 1 is a part that constitutes a terminal of the switch pole board, a fixed contact, or the like.

Reference numeral 2 is an insulator. The insulator 2 is formed by injecting a molten synthetic resin into a mold, and the conductor 1 is insert-molded at the time of injection molding. This injection molding die is provided with a cutting machine 3 including a punch 31 and a die 32. After the insulator 2 cools and solidifies inside the die, the cutting machine 3 causes the connecting portion 11 to move to the insulator 2.
The conductor 1 is cut to separate the conductor 1 into each part.

At this time, an insulator piece 21 is generated by the above cutting, and a cut hole 22 is formed in the trace of the insulator piece 21. The insulator piece 21 is adjusted by adjusting the movement amount of the punch 31. It can remain in the cutting hole 22.

At this time, the connecting portion 11 at the lower end of the insulating piece 21 projects into the opening 33 provided in the die 32, but the connecting portion 11 made of metal and the insulating piece 21 made of synthetic resin have an adhesive force. Is weak and the heat shrinkage rate is also very different,
As the insulator piece 21 is cooled, the connecting portion 11 is separated from the insulator piece 21 and falls off as shown in FIG. If the connecting portion 11 is difficult to peel off from the insulator piece 21, the connecting portion 1 may be forcibly peeled off by using a desired peeling means. As a result, only the insulator portion of the insulator piece 21 stays in the cutting hole 22 and blocks the inside and the outside of the storage space.

The insulator 2 having a cut hole 22 in which the insulator piece 21 is retained and the conductor 1 insert-molded in the insulator 2 constitute a switch pole board, and the insulator 2 is a movable contact piece. One wall surface of a storage space for storing electric parts (not shown) such as At this time, the insulator piece 21
Is in a state of protruding from the cutting hole 22 not to the inside of the storage space but to the outside, so that the insulator piece 21 does not hinder the operation of the movable contact piece or the like. However, it goes without saying that even if the insulator piece 21 is projected from the cutting hole 22 to the inner side of the storage space, the protruding direction can be arbitrarily set as long as there is no functional problem. Further, since the conductive connecting portion 11 is removed, the insulating performance between the conductors 1 is improved as compared with the case where the connecting portion 11 remains together with the insulator piece 21.

Next, the manufacturing method of the first embodiment will be sequentially described. First Step First, the first step will be described with reference to FIG. In the first step, the conductor 1 having the shape connected by the connecting portion 11 is insert-molded on the insulator 2 by an injection molding die having the cutting machine 3 including the punch 31 and the die 32.

Second Step Next, the second step will be described with reference to FIG. In the second step, following the first step, the connecting portion 11 and the insulator 2 are cut by the cutting machine 3. More specifically, after the insulator 2 formed in the first step is cooled and solidified, the punch 31 is moved in the direction indicated by the arrow A in FIG. 2 by using a pressurizing means such as a hydraulic cylinder. Then, the connecting portion 11 of the conductor 1 is punched by the punch 31.
The insulator piece 21 is generated while being cut by. This insulator piece 21 is left in the cutting hole 22 by adjusting the movement amount of the punch 31.

Third Step Next, the third step will be described with reference to FIG. In the third step, following the second step, the connecting portion 11 of the insulator piece 21 generated in the second step is removed, and only the insulator portion is not removed and is insulated from the cutting machine 3 while remaining in the cutting hole 22. Separate from body 2. The insert-molded component of the first embodiment formed through the above steps can prevent foreign matter, water droplets, and the like from entering through the cutting hole 22 by the insulator piece 21 remaining in the cutting hole 22.

Next, a second embodiment of the present invention will be described with reference to FIGS.
This will be described with reference to FIG. In the second embodiment, the insulator 4 is also adhered to the lower part of the connecting portion 11, and both the cut connecting portion 11 and the falling piece 42 of the insulating member 4 fall off. Reference numeral 1 in the drawing is the same conductor as the conductor 1 described in the first embodiment, and a description thereof will be omitted.

Reference numeral 4 is an insulator. The insulator 4 is formed by injecting a molten synthetic resin into a mold and molding the same as the insulator 2 of the first embodiment, and the conductor 1 is insert-molded at the time of injection molding. This injection molding die is provided with the same cutting machine 3 as that of the first embodiment, which includes a punch 31 and a die 32. After the insulator 4 is cooled and solidified inside the mold, the cutting machine 3 cuts the connecting portion 11. The insulator 4 is also cut to separate the conductor 1 into each part.

After that, an insulator piece 41 is generated by the above cutting, and a cutting hole 43 is formed in the trace of the insulator piece 41. The insulator piece 41 is cut by adjusting the movement amount of the punch 31. It can remain in the hole 43.

At this time, the connecting portion 11 at the lower end of the insulator piece 41 and the falling piece 42, which is a half crack of the insulator piece 41, are
Although it protrudes into the opening 33 provided in the die 32, the metal connecting portion 11 and the insulating piece 41 made of synthetic resin have a weak adhesive force and greatly differ in heat shrinkage rate.
As shown in FIG. 5, the connecting portion 11 is separated from the insulator piece 41 as the sheet is cooled, and is removed together with the drop piece 42. As a result, only the insulator portion of the insulator piece 41 has the cutting hole 43.
Stay inside to block the inside and outside of the storage space.

The insulator 4 having the cut hole 43 in which the insulator piece 41 is retained and the conductor 1 insert-molded in the insulator 4 constitute a switch pole board, and the insulator 4 is movable. One wall surface of a storage space for storing electric parts (not shown) such as At this time, the insulator piece 41
Is in a state of protruding from the cutting hole 43 not to the inside of the storage space but to the outside, so that the insulator piece 41 does not hinder the operation of the movable contact piece or the like. However, it goes without saying that even if the insulator piece 41 is projected from the cutting hole 43 to the inside of the storage space, the protruding direction can be arbitrarily set as long as there is no functional problem. Further, since the conductive connecting portion 11 is removed, the insulating performance between the conductors 1 is improved as compared with the case where the connecting portion 11 remains together with the insulator piece 41.

The manufacturing method of the second embodiment is the same as that of the first embodiment and its explanation is omitted.
The second step is shown in FIG. 5, and the third step is shown in FIG.

[0024]

Since the present invention has the above-described structure and operation, it is necessary to prevent foreign matter, water droplets, and the like from entering through the cutting holes formed by cutting the connecting portion of the conductor, as in the case of the prior art. There is no need to use a sealant, etc., and foreign matter, water droplets, etc. can enter from the cutting hole by a simple structure and a simple manufacturing method that only leaves the insulating piece generated when the connecting part is cut in the cutting hole. In addition to the prevention of the above, it is possible to further improve the insulation performance between the separated conductors by dropping the cut connecting portion from the cut hole.

[Brief description of drawings]

FIG. 1 is a cross-sectional view showing a first embodiment of the present invention,
The 1st process of manufacturing an insert molding part is shown.

FIG. 2 is a cross-sectional view showing the first embodiment of the present invention,
The 2nd process of manufacturing an insert molding part is shown.

FIG. 3 is a cross-sectional view showing the first embodiment of the present invention,
The 3rd process of manufacturing an insert molding part is shown.

FIG. 4 is a cross-sectional view showing a second embodiment of the present invention,
The 1st process of manufacturing an insert molding part is shown.

FIG. 5 is a cross-sectional view showing a second embodiment of the present invention,
The 2nd process of manufacturing an insert molding part is shown.

FIG. 6 is a sectional view showing a second embodiment of the present invention,
The 3rd process of manufacturing an insert molding part is shown.

FIG. 7 is an exploded perspective view showing a conventional technique.

FIG. 8 is a perspective view of a conductor according to a conventional technique.

[Explanation of symbols]

 DESCRIPTION OF SYMBOLS 1 Conductor 2,4 Insulator 3 Cutting machine 11 Contact part 21,41 Insulator piece 22,43 Cutting hole 31 Punch 32 Die 42 Falling piece

 ─────────────────────────────────────────────────── ─── Continuation of the front page (72) Inventor Akira Iijima 104-2 Yanagibashi, Tsukuba-shi, Ibaraki Niles Parts Co., Ltd. Tsukuba Factory

Claims (5)

[Claims] 1. The shape before insert molding has a connecting portion (1
1) A conductor (1) having a shape connected to each other, an insulator (2) obtained by insert molding the conductor (1), and the connecting part (11) are cut together with the insulator (2). An insert-molded part comprising an insulator piece (21) generated at this time and a cutting hole (22) for retaining the insulator part of the insulator piece (21) without dropping off the connecting portion (11). 2. The invention according to claim 1, wherein the insulator (2) constitutes at least one wall surface of a storage space for storing an electric component, and the connecting portion (1).
An insert-molded part in which the insulator piece (21) from which 1) has fallen off stays in the cutting hole (22) to block the inside and the outside of the storage space. 3. The insert-molded component according to claim 2, wherein the insulator piece (21) from which the connecting portion (11) has fallen off protrudes from the cutting hole (22) to the outside between the storage chambers. 4. The invention according to claim 1, 2 or 3, wherein the insulator (2) has a cut hole (22) in which the insulator piece (21) from which the communication part (11) has fallen off is retained, An insert-molded part in which a pole plate of a switch is constituted by the conductor (1) insert-molded on the insulator (2). 5. A first step of insert-molding a conductor (1) having a shape connected by a connecting part (11) into an insulator (2), and following the first step, the connecting part (11) is formed into an insulator. (2) A second step of cutting with a cutting machine (3), and an insulator piece (21) generated in the second step following the second step
And a third step of separating the cutting machine (3) and the insulator (2) while leaving the connecting part (11) of the insulator and leaving only the insulator part in the cutting hole (22). A method for manufacturing an insert-molded part having the same.