JPH07142145A - Molding method for molded products with terminals - Google Patents

Abstract

(57) [Summary] [Purpose] To easily obtain a molded product incorporating a terminal piece. [Structure] When molding a molded product formed by inserting a plurality of terminal pieces 4 to 6 made of a conductive material into a casing 2, each terminal piece 4 to 6 is provided with a resin spacer block 9 between them. The terminal unit 18 is created by interposing and interposing. After that, the terminal unit 18 is mounted on the molding dies 15 and 16 for molding.

Description

Detailed Description of the Invention

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a method for molding a molded product with a terminal.

[0002]

2. Description of the Related Art Various connectors have heretofore been used for connecting wiring of electric components such as automobiles.
In such a connector, terminals having a plurality of poles are arranged inside a casing. Conventionally, these terminals have been assembled in the casing as follows.

That is, rather than setting a terminal piece in a die for forming a casing suddenly, a plurality of terminal pieces are mounted on a die for primary molding, and first, primary molding (insert molding) is partially performed. Put each terminal piece together. After that, a mold for molding the casing (a mold for secondary molding) is mounted to obtain a casing with a terminal (for example, actual open flat plate 3-5566).
(See Japanese Patent Publication No. 5).

In addition to such a method, there is also a method of directly mounting each terminal piece in a mold for molding a casing for molding.

[0005]

However, it is troublesome and workability is difficult to directly set the terminal piece in the mold as in the above-mentioned procedure.

The present invention has been developed and devised in view of the above circumstances, and an object thereof is to provide a molding method for a molded product with a terminal, which can easily obtain a molded product in which a terminal piece is incorporated. That is.

[0007]

The method of the present invention for achieving the above object is a method for forming a molded article by inserting a plurality of terminal pieces made of a conductive material into a casing. The terminal piece is held by a holding member made of an insulating material interposed therebetween, and then mounted on a molding die for molding.

[0008]

[Function] The whole is held while the holding member is interposed as a partition between each terminal piece. As a result, each terminal piece is in a unitized state. afterwards,
Molding is performed by mounting each unitized terminal piece on a molding die.

[0009]

Therefore, since the plurality of terminal pieces are unitized by the holding member and the mold is mounted in this state, the molding process can be performed only once. Therefore,
The molding workability is improved as compared with the conventional one.

[0010]

Embodiments of the present invention will be described below in detail with reference to the drawings. FIG. 2 shows an electric connection box 1 for an automobile, and the casing 2 as a whole is opened upward to form a first connection portion 3. Further, a small second connecting portion 7 is provided on one side surface of the casing 2 and similarly opens upward. Further, a plurality of terminal pieces 4 to 6 (three in this example) are incorporated in the casing 2 by insert molding.

Each of the terminal pieces 4 to 6 is formed of a conductive material (copper plate), and as shown in FIG. 3, tabs 4a, 4b to 6a, 6b are formed in a bent manner at both ends thereof. The tabs 4a, 4b to 6a, 6b project into both the connecting portions 3, 7 described above. However, the length of each of the terminal pieces 4 to 6 is set so that each of the tabs 4a, 4b to 6a, 6b can be juxtaposed by three at appropriate intervals in both connecting portions. Of these, the first
The tabs 4b to 6b protruding toward the connecting portion 3 side are the first connecting portion 3
It projects from the side surface of a step portion 8 (a portion where a spacer block 9 described later is embedded) formed at one edge of the inside. In addition, each tab 4 in the first connecting portion 3 and the second connecting portion 7
The protruding heights of a, 4b to 6a, 6b are made uniform for both connecting portions, but depending on the type of the mating connector connected to the first connecting portion 3, for example, the protruding height and the protruding length to the front side. It is also possible to change the setting in various ways.

Next, the procedure for molding the above-mentioned electrical junction box 1 will be described. First, the terminal pieces 4 to 6 are put together by a holding member. As shown in FIG. 3, the holding member is composed of a resin spacer block 9 and a resin clip 10. Explaining these, the spacer block 9 is formed by stacking a plurality of layer plates 11 in the height direction at predetermined intervals and connecting them by a plurality of connecting pieces 20 arranged on the back side thereof. . As a result, the spacer block 9 stores the terminal pieces 4 to 6 between the respective layer plates 11 in a substantially tightly-closed state.
Will be formed in multiple stages. Further, both ends of the spacer block 9 are bent toward the front side in FIG. 3, and the storage grooves 12 are also provided continuously along this bending. However, the opening edge of each storage groove 12 is chamfered on the front edge of each layer plate 11 in order to facilitate the storage work of the terminal pieces 4 to 6, although not shown in detail. Furthermore, two pairs of upper and lower recesses 13 for mounting the clips 10 are formed on the upper and lower surfaces of the spacer block 9.

The clip 10 is formed in a U-shape capable of elastically clamping the spacer block 9 from the front side, and an engaging claw 14 that engages with the back surface of the spacer block 9 at the opening edge of the U-shape. Can be provided. Positioning pins 17 (corresponding to the positioning means of the present invention) for molding dies 15 and 16 for molding the casing 2 are integrally projected on both upper and lower surfaces of the clip 10.

Now, the terminal pieces 4 to 6 corresponding to the respective housing grooves 12 of the spacer block 9 are selected and inserted. In this case, the tabs 4b to 6b on the side projecting to the first connection part 3 after molding project from the front surface of the spacer block 9, and the tabs 4a to 6a on the side projecting to the second connection part 7 bend one side of the spacer block 9. It is inserted so that the protruding length differs from the part toward the front. Next, the clip 10 is made to face the front surface of the spacer block 9 and is pressed into the pair of concave portions 13 while being aligned.
As a result, the engaging claws 14 wrap around the back surface of the spacer block 9 and engage with each other, and as a result, as shown in FIG. 1, the terminal pieces 4 to 6 are integrated in a state in which they are prevented from coming off and the terminal unit 18 is formed. Become.

After that, the above-mentioned terminal unit 18 is mounted on the molding dies 15 and 16. At this time, the positioning pins 17 of both clips 10 are respectively inserted into the positioning holes 15a provided in the molding surface of the fixed mold 15,
Position it. Next, when the movable mold 16 is aligned with the fixed mold 15 and the mold is closed, the positioning pins 17 facing the movable mold 16 are inserted into the positioning holes 16 a provided in the molding surface of the movable mold 16. In this way, the resin is filled after the mold is closed. In this case, it is necessary to select the material of the casing 2 that is lower than the melting points of the material of the clip 10 and the spacer block 9. In this example, the casing 2 is made of PBT or PPS, and the spacer block 9 and the clip 10 are made of 66 nylon or 46 nylon having a higher melting point. When the molding is completed and the mold is opened as described above, the electric junction box in which the terminal pieces 4 to 6 are incorporated as shown in FIG. 2 is taken out.

As described above, according to the method of this embodiment, the terminal unit 18 is formed and the respective terminal pieces 4 to 6 are integrated at the time of molding, so that the conventional pre-molding is unnecessary. You can Therefore, improvement of work efficiency can be expected. In addition, since the clip 10 is provided with the positioning means, the clip 10 can be easily attached to the mold.

The number and shape of the terminal pieces to be mounted are not limited to those of the embodiment, and the clip can be omitted. For this purpose, for example, the spacer block may be provided with a terminal piece holding means.

[Brief description of drawings]

FIG. 1 is a perspective view showing a terminal unit.

FIG. 2 is a perspective view showing an electric connection box.

FIG. 3 is an exploded perspective view of a terminal unit

FIG. 4 is a cross-sectional view showing a state in which a mold is mounted.

[Explanation of symbols]

 2 ... Casing 4-6 ... Terminal piece 9 ... Spacer block 10 ... Clip 17 ... Positioning pin (positioning means) 18 ... Terminal unit

Claims (1)

[Claims] 1. A method of molding a molded article, comprising inserting a plurality of terminal pieces made of a conductive material into a casing, wherein each of the terminal pieces has a holding member made of an insulating material interposed therebetween. A method for molding a molded product with a terminal, which comprises holding in a state of being held, and then setting it in a molding die to perform molding.