JPH07108543A - Method for molding metal-inserted resin - Google Patents

Abstract

PURPOSE:To provide a method for molding a metal-inserted resin by decreasing the number of metal parts enclosed in a molding resin, thus facilitating the sealing in a mold, reducing manufacturing processes, facilitating manufacture automation, and lessening manufacturing costs. CONSTITUTION:A terminal 1 of a required shape which is connected integrally at a narrow articulation 5 is placed in a pair of molds 11, 12, the narrow articulation 5 is cut off by pushing out a cutter 13 from the inside of a guide 14 by pressurizing the molds 11, 12 with the terminal 1 held sandwiched between the guide 14 in the molds 11, 12, and then a molding resin is poured into the molds 11, 12 to seal the terminal 1.

Description

Detailed Description of the Invention

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a metal insert for molding a metal circuit wire, a metal terminal, a metal piece, a mounting metal, etc. (hereinafter collectively referred to as a metal plate) so that all or a part of the metal insert is sealed in a resin. Regarding the resin molding method, this technology is particularly effective for plastic-sealed products of electric circuits.

[0002]

2. Description of the Related Art In the conventional metal insert resin molding method,
The metal part of the circuit conductor that should not be electrically conducted is manufactured as a separated metal part from the beginning, manually placed in a predetermined position in the mold, and then plastic resin is poured to seal the metal part. It is integrally molded as described above. In the conventional metal insert resin molding method, each electrically insulated metal part is manufactured as a separate metal part and placed individually in the mold, which increases the number of metal parts and the placement in the mold. It was tedious to work, and the placement position was apt to be incorrect. As explained in the example of plastic encapsulation of electric circuits, multiple metal parts are
Even in the case of the metal insert resin molding method, in which it is necessary to separate and enclose from the viewpoint of vibration and strength, there are similar problems.

[0003]

The problem to be solved by the present invention is to solve these conventional problems, to reduce the number of metal parts, to speed up the sealing in the mold, and to reduce the number of manufacturing steps. The object of the present invention is to provide a metal insert resin molding method that facilitates automation of manufacturing and can reduce manufacturing cost.

[0004]

Means for Solving the Problems The gist of the present invention, which has solved the above problems, is to place metal plates of a desired shape integrally connected by a thin connecting portion in a pair of molds and press the molds. The metal plate is sandwiched between the molds, the cutting blade is pushed out from inside the mold to cut and separate the thin connecting portion of the metal plate, and then the molding resin is poured into the mold to seal the metal plate. It is in the metal insert resin molding method. The extrusion direction of the cutting blade of the present invention includes vertical, horizontal, and diagonal directions, and the direction is appropriately selected.

[0005]

In the present invention, metal parts which must be separated for electrical / thermal / vibration / strength are connected through a thin connecting part to produce an integrated metal plate (Fig. 4). reference). By connecting them, the number of parts of the metal plate to be manufactured can be reduced. Next, the connected metal plates are placed at a predetermined position in the mold. This work also can be easily and swiftly installed due to the small number of parts and the large size of the parts (see FIGS. 1A and 2). After that, the metal plate is pressed by the pair of molds to sandwich it. Next, the cutting blade built in the mold is pushed into the thin connecting portion of the metal plate to cut the connecting portion and separate it so as not to contact (see FIG. 1 (c)). After cutting and separating, the molding resin is poured into the mold to integrally mold the metal plate and the plastic.

[0006]

Embodiments of the present invention will be described below with reference to the drawings. The present invention is an example applied to the manufacture of a housing of an electric product in which a terminal is sealed in resin for waterproofing. Figure 1
2 is an explanatory view showing the operation of the process of the embodiment of the present invention, FIG. 2 is a process drawing of the embodiment, FIG. 3 is a plan view showing a terminal product at the stage of the stamping process, and FIG. 4 is a metal plate after the stamping process. 5 is a bottom view of the upper mold, and FIG. 6 is a plan view of the lower mold.

In the figure, 1 is a terminal which is a metal plate, 2,
3, 4 are conductor parts of each terminal of the terminal 1, 5, 6, 7 are connecting parts for connecting the conductor parts, 8 is a product in the stamping process step which is punched out in a state where a plurality of terminals 1 are connected, 9 is Mounting part of the terminal 1 of the product, 10 is a pin hole for positioning the terminal 1, 11 is a lower mold, 12 is an upper mold, 13 is a cutting blade, 14 is a cylindrical guide for guiding the cutting blade, and 15 is Inclined piece attached to the lower end of the cutting blade 13, 16
Is a slide piece in sliding contact with the inclined surface of the same inclined piece, 17 is a cylindrical die on the side of the upper die 12, 18 is a slider, 19 is a cavity of the upper die 12, 20 is a cavity of the lower die 11, 21 Is a resin.

In this embodiment, the terminal 1 shown in FIG.
4 is taken out by cutting the mounting portion 9 of the product 8 in the stamping process stage in which plural terminals are mounted. First, the taken out terminal 1 is placed at a predetermined position of the lower mold 11 (see FIGS. 1A, 2A and 2B). The terminal 1 is placed on the protruding guide 14 of the lower mold 11. At this time, the positioning pin hole 10 allows accurate positioning. Next, the upper die 12 is lowered and the terminal 1
Is pressed by the die 17 of the upper die 12 and the guide 14 of the lower die 11 to be sandwiched.

After that, the slide piece 1 on the lower die 11 side
6 is moved horizontally, the inclined piece 15 is pushed up, and the cutting blade 1
3 is moved up along the guide 14 to cut the connecting portions 5, 6, 7 of the terminal 1 (FIG. 1 (c), FIG. 2).
(See (c)). By being cut, the conductor portions 2, 3 and 4 of the terminal 1 are separated and electrically insulated.

After cutting, while the resin is being poured into the cavities 19 and 20 of the upper mold 12 and the lower mold 11, the die 17 is retracted into the upper mold 12 to integrate the terminal 1 into the resin. It is a thing. The terminal 1 (a part of each of the conductors 2, 3 and 4) is exposed to the outside of the cavity and is not coated with resin (see FIGS. 1 (d) and 2 (c)). As a result, a housing product in which the conductor portions 2, 3 and 4 are encapsulated in a resin in a state where a part thereof is exposed to the outside is completed.

As can be seen from this embodiment, one terminal 1 can seal three metal parts of the conductor parts 2, 3 and 4, resulting in a large number of parts and a large number of parts settings. It has a small width and can be loaded quickly and accurately. Further, since the support pins of the terminals are moved and molded during the molding, a product suitable for waterproofing purpose can be obtained.

[0012]

As described above, according to the present invention, since a plurality of conventional metal parts are connected to each other and arranged in a mold as one part, and the parts are divided in the mold, the number of parts can be reduced, Moreover, the loading work of the metal parts can be done quickly and accurately. This facilitated automation of molding. It also enables efficient manufacturing of parts.

[Brief description of drawings]

FIG. 1 is an explanatory diagram showing an operation of a process of an example of the present invention.

FIG. 2 is a process drawing of an example.

FIG. 3 is a plan view showing a product of a terminal at a stage of a stamping process.

FIG. 4 is a plan view showing the individually separated terminals after the stamping process.

FIG. 5 is a bottom view of the upper mold of the embodiment.

FIG. 6 is a plan view of a lower mold of Example.

[Explanation of symbols]

 1 Terminal 2 Conductor Part 3 Conductor Part 4 Conductor Part 5 Connecting Part 6 Connecting Part 7 Connecting Part 8 Product 11 Lower Die 12 Upper Die 13 Cutting Blade 14 Guide 17 Die

Claims (1)

[Claims] 1. A metal plate having a required shape integrally connected by a thin connecting portion is placed in a pair of molds, and the molds are pressed to cut the metal plates from the inside of the molds. A metal insert resin molding method characterized in that a blade is extruded to cut and separate a thin connecting portion of a metal plate, and then a molding resin is poured into a mold to seal the metal plate.